PIETRO FIORENTINI Dival 600 User manual

MT-185-E
ENGLISH
PRESSURE
REGULATOR
TECHNICAL MANUAL
INSTALLATION ,COMMISSIONING
ANDMAINTENANCEISTRUCTIONS

Tecnical Manual MT 185-E
1
INLET PRESSURE
OUTLET PRESSURE
TR. Head
3 Way body
4 Way body.

Tecnical Manual MT 185-E
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PRECAUTION
GENERAL PRECAUTION
The apparatus described in this manual is a device subject to pressure
installed in systems under pressure;
The apparatus in question is normally installed in systems for
transporting flammable gases (natural gas, for example).
PRECAUTION FOR THE OPERATORS
Before proceeding with installation, commissioning or
maintenance, operators must:
Examine the safety provisions applicable to the installation in
which they must work;
Obtain the authorisations necessary for working when
required;
Use the necessary means of individual protection (helmet,
goggles, etc.);
Ensure that the area in which they operate is fitted with the
means of collective protection envisaged and with the
necessary safety indications.
HANDLING
The handling of the apparatus and of its components must only be
carried out after ensuring that the lifting gear is adequate for the loads
to lift (lifting capacity and functionality). The apparatus must be
handled using the lifting points provided on the apparatus itself.
Motorised means must only be used by the persons in charge of them.
PACKING
The packing for transportation ofequipment and of relevant spare parts
are designed and shaped to avoid damage to any part during
transportation, warehousing and handling activities. Therefore the
equipment and spare parts shall be kept into their packing until their
installation in the final site. After packing is open, check that no
damage occurred to any goods. If damage occurred inform the supplier
and keep packing for any verification.
INSTALLATION
The installation of the pressure regulator has to occur in compliance
with the provisions (laws or standards) in force in the place of
installation.
In detail, natural gas plants have to show features in compliance with
the law provisions and standard requirements in force in the place of
installation or at lease in compliance with standards EN 12186 or EN
12279; in detail, it is necessary to meet the provisions of paragraphs
6.2, 7.5.2, 7.7, 9.3 of the standard EN 12186 and 6.2, 7.4, 7.6, 9.3 of
the EN 12279 standard. The installation in compliance with such
standards minimizes the risk of fire hazard and the formation of
potentially explosive atmospheres.
The valve is not equipped with external pressure limitation devices;
therefore, it has to be installed making sure that the operating pressure
of the assembly on which it is installed does not exceed the maximum
allowable pressure (PS).
Therefore, the user, as deemed necessary by the same, shall install on
the assembly suitable pressure limitation systems, as well as provide
the plant with suitable relief or drain systems in order to discharge the
pressure and fluid contained in the plant before proceeding with any
inspection and maintenance activity.
If the installation of the apparatus requires the application of
compression fittings in the field, these must be installed following the
instructions of the manufacturer of the fittings themselves. The
choice of the fitting must be compatible with the use specified for the
apparatus and with the specifications of the system when envisaged.
COMMISSIONING
Commissioning must be carried out by adequately trained personnel.
During the commissioning activities, the personnel not strictly
necessary must be ordered away and the no-go area must be properly
signalled (signs, barriers, etc.).
Check that the settings of the apparatus are those requested; if
necessary, reset them to the required values in accordance with the
procedures indicated in the manual.
When commissioning, the risks associated with any discharges into the
atmosphere of flammable or noxious gases must be assessed.
In installations in natural gas distribution networks, the risk of the
formation of explosive mixtures (gas/air) inside the piping must be
considered.
CONFORMITY TO DIRECTIVE 97/23/EC (PED)
Pressure regulator Dival 600 is classified as pressure accessory
according to directive 97/23/EC (PED).
The pressure regulator Dival 600 with embedded block device, with
pressure switch for tripping in case of maximum pressure, is defined as
a safety accessory according to PED Directive and, therefore, it can be
used both as a pressure accessory and a safety accessory, always
according to the PED Directive.
The configuration of the regulating pressure regulator plus in line
monitor regulator is defined as safety accessory according to the PED
Directive.
In this case the user shall verify that the maximum allowable pressure
(PS) of pressure equipment to be protected is consistent with setting
and closing class (SG) of monitor regulator; the pressure inside
pressure equipment shall be lower than 110% of PS.
Conformity with Directive 97/23/EC and CE marking of pressure
regulator and relevant accessory require installation in the system with
minimum requirements according to EN 12186).

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1.0 INTRODUCTION 4
1.1 MAIN FEATURES 4
1.2 OPERATIONOFTHEPRESSUREREGULATORDIVAL600 4
1.3 SETTINGSPRINGS 5
2.0 INSTALLATION 6
2.1 GENERAL 6
2.2 CONNECTINGTHEAPPARATUSES 7
2.3 DOWNSTREAM VOLUMEREQUIREDFORINSTALLATION 8
3.0 MODULARITY’ 8
3.1 LA/..INCORPORATEDSLAM-SHUT 8
3.2 LA/..SLAM-SHUTSETTINGSPRINGS 10
3.3 DIVAL600FUNCTIONINGASAMONITOR 11
3.3.1 CONSTRUCTIVECHARACTERISTICS 11
3.4 INTEGRATEDSILENCER 11
4.0 ACCESSORIES 12
4.1 RELIEFVALVE 12
4.1.1 DIRECTINSTALLATIONINTHELINE 12
4.1.2 INSTALLATION 12
5.0 START UP 13
5.1 GENERAL 12
5.2 GASINPUT,CONTROLOFEXTERNALTIGHTNESS
ANDSETTING 13
5.3 COMMISSIONINGTHEREGULATOR 13
5.4 COMMISSIONINGTHEREGULATORWITH
INCORPORATEDLA/..SLAM-SHUT 13 INCORPORATEDLA/..SLAM-SHUT13
5.5 COMMISSIONINGTHEREGULATORPLUS
DIVAL600INLINEMONITORWITHINCORPORATED
LA/..SLAM-SHUTVALVE/ 15 15
6.0 TROUBLE-SHOOTING 16
6.1 TABLE8 REGULATOR 16
6.2 TABLE9 SLAM-SHUT 17
7.0 MAINTENANCE 18
7.1 GENERAL 18
7.2 DIVAL600REGULATORMAINTENANCEPROCEDURE 18
7.3 DIVAL600REGULATOR 18
7.4 REPLACEMENTTHEANTI-PUMPINGVALVE 21
7.5 LA/..SLAM-SHUTVALVE 25
8.0 FINAL OPERATION 26
8.1 CHECKINGTHETIGHTNESSANDSETTING 26
8.2 STARTUP 26
- INDEX -.

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1.0 INTRODUCTION
The scope of this manual is to provide the essential information for the
installation, commissioning, disassembly, re-assembly and
maintenance of DIVAL 600 regulators.
It is also appropriate to provide a brief illustration of the main features
of the regulator and of its accessories.
1.1 MAIN FEATURES
The DIVAL 600 pressure regulator is a pressure regulator for
previously cleaned gaseous fluids and is suitable for medium and low
pressures.
The DIVAL 600 is a normally open regulator and consequently opens
in the event of:
-Breakage of the main diaphragm;
-No regulated pressure signal.
The main specifications of this regulator are:
-Design pressure PS: up to 20 bar;
-Operating Temperature range: -20 °C to + 60 °C;
-Ambient Temperature range: -20 °C to + 60 °C;
-Inlet pressure range bpu: 0,2 to 20 bar;
-Possible regulation range Wd:
10 to 350 mbar for head Ø 280;
280 ÷ 4400 mbar for head Ø 280/TR;
- Minimum differential pressure: 0.1 bar;
- Accuracy class AC: up to 5 (according to the output pressure field);
- Lockup pressure class SG: up to 10 (according to the output
pressure field)
1.2 OPERATION OF THE PRESSURE
REGULATOR DIVAL 600 (fig. 1)
In absence of pressure the obturator 3 is kept in open position from the
hook of shaft 9 on the side of the levers 13 (fig. 1).
The outlet pressure Pd is checked through the comparison between
the load of the spring 43 and the impulse of the outlet pressure on the
membrane 19.
In this comparison are involved also the weight of the mobile
equipment and the dynamic thrusts on the obturator.
The upstream pressure, although it is variable, has not any influence
on the balance of the obturator 3, since this latter, due to the presence
of the hole A, is positioned between two equal pressures acting on
equal surfaces.
The movement of the diaphragm 9 is transmitted by the lever system
13 to the stem 9 and hence to the obturator 3. The obturator 3 is fitted
with a vulcanized rubber gasket to ensure perfect tightness with zero
flow rate demand.
If, during operation, the downstream pressure drops, the force it exerts
on the diaphragm 19 becomes lower than the load of the spring 43.
The diaphragm therefore drops and, by means of the lever system 13,
pulls the obturator 3 away from the valve seat 2. The gas flow,
therefore, increases until the initial pressure set-point is restored.
If, on the other hand, the downstream pressure begins to increase, the
force exerted on the diaphragm 19 exceeds the load the spring 43. The
obturator is therefore displaced towards the closed position, returning
the downstream pressure the set-point.
In normal working conditions, the obturator 3 is positioned in such a
way as to maintain the pressure Pd around the selected set-point.
To adjust the pressure set-point you con turn the internal adjustment
ring 28 appropriately, clockwise to increase and anticlockwise to
reduce it. Normally the plug is only used the cover the lower band of
the various setting ranges; the adjusting screw is used for the higher
values.
The pressure regulator is equipped with two anti-pumping devices 33
and 34 (fig. 1), which are in charge of slowing down the inflow/outflow
of the gas/air in the head only during the transitory phases, in order to
avoid possible oscillation phenomena of the regulated pressure.
Thereare alsotwostops V1andV2forthe purposeof eliminating damaging effects
which could derive from accidental over-pressures below the diaphragm 19 or from
overloadingofthespring43.
Usually, a solution of the type shown in fig. 2a is adopted in order to
protect the obturator against damages resulting from sudden increases
of the regulated pressure.
In fact, this solution allows the diaphragm protection disc 20 to rest on
the upper stroke end V1 exceeding the load of the spring 42 and thus
releasing the obturator from the load resulting from the sudden
pressure increase.
In order to prevent small leaks at null required flow rate or that sudden
and temporary overpressures, resulting for example from fast
manoeuvres or gas overheating, may let the slam-shut valve trip, the
solution shown by fig. 2a can be transformed, upon request, into an
embedded relief valve, eliminating the O-ring 73 and adding the ring 70
(fig. 2b).
Its operation is described as follows: with closed regulator, any
overpressures lift the diaphragm protection disc 20 exceeding the load
of the springs 42 and 43. In this way, a given quantity of gas is
discharged through the seat Z of the relief valve.
fig.1

Tecnical Manual MT 185-E
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fig. 2a fig. 2b
1.3 Tab. 1 SETTING SPRING
Table 1 shows the calibration fields of the different foreseen springs.
Springs Characteristics Dival 600
Code
Colour
De
Lo
d
Setting range (mbar)
HEAD
2701345
YELLOW
65
180
3.5
2700525*
ORANGE
22
2
40
10÷18
2701620
ORANGE
65
180
4
2700525*
ORANGE
22
40
22
15÷30
2701860
RED
65
180
4.5
2700525*
ORANGE
22
40
2
25÷49
2702190
GREEN
65
180
5
2700645*
RED
22
40
2,3
40÷75
2702370
BLACK
65
180
5.5
2700645*
RED
22
40
2,3
62÷120
2702540
BLU
65
180
6
2700645*
RED
22
40
2,3
100÷170
2702730
LIGHTBLUE
65
180
6,5
2700645*
RED
22
40
2,3
145÷270
2702950
BROWM
65
180
7
280
2700645*
RED
22
40
2,3
230÷350
2701345
YELLOW
65
180
3.5
2700525*
ORANGE
22
40
2
8÷15
2701620
ORANGE
65
180
4
2700525*
ORANGE
22
40
2
12÷26
2701860
RED
65
180
4.5
2700525*
ORANGE
22
40
2
21÷46
2702190
GREEN
65
180
5
2700645*
RED
22
40
2,3
36÷70
2702370
BLACK
65
180
5.5
2700645*
RED
22
40
2,3
57÷120
2702540
BLU
65
180
6
2700645*
RED
22
40
2,3
100÷170
2702730
AZZURRO
65
180
6,5
2700645*
RED
22
40
2,3
145÷270
2702950
BROWN
65
180
7
280
REGULATOR
UPSIDEDOWN
2700645*
ROSSO
22
40
2,3
230÷350
2702940
LIGHTBLUE
150
7
280÷720
2703125
WHITE-YELLOW
150
7.5
590÷ 1000
2703325
WHITE-ORANGE
150
8
840÷1250
2703685
WHITE-GREEN
150
9
1050÷2300
2703995
WHITE-BLACK
65
150
10
2000÷4400
280/TR
De = external diameter d= wire diameter Lo = length *= for internal relief valve.

Tecnical Manual MT 185-E
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2.0 INSTALLATION
2.1 GENERAL
Pressure regulator does not require any supplementary upstream
safety accessory for protection against overpressure compared with its
design pressure PS, when upstream reducing station is sized for a max
downstream incidental pressure MI Pd ≤ 1,1 PS.
Before installing the regulator it is necessary to ensure that:
-The regulator can be inserted in the space provided and that
subsequent maintenance operations will be sufficiently practicable
(see overall dimensions in table 2);
- Inlet and outlet pipings must be at the same level and able to carry
the weight of the regulator (see chart 2b);
-The inlet/outlet flanges of the piping are parallel;
-The inlet/outlet flanges of the regulator are clean and the regulator
itself has not been subject to damage during transport;
-The piping upstream has been cleaned to expel residual impurities
such as welding scale, sand, paint residues, water, etc.
The usually foreseen arrangement is the one indicated in figure 3.
Other possible installations are shown in figure 4
Tab. 2a: Overall dimensions in mm
Tipo
DN
NPS
S
A
B
B1
E
D
M
N
Dival 600
25
1”
183
145
343
433
215
280
Rp 1/2”
Rp 1/4”
Dival 600
40
1”1/2
223
145
343
433
215
280
Rp 1/2”
Rp 1/4”
Dival 600
50
2”
254
158
343
433
215
280
Rp 1/2”
Rp 1/4”
Dival 600
G2”
2 NPT
152,4
158
343
433
215
280
Rp 1/2”
Rp 1/4”
Tab. 2b: Weights in KGF
Type
DN
NPS
Dival
Dival with slam shut valve LA/…
Dival 600
25
1”
15
16
Dival 600
40
1”1/2
17
18
Dival 600
50
2”
20
21
Dival 600
G2”
2 NPT
18
19
fig. 3 Standard Regulator
Figura 1

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2.2 CONNECTING THE DEVICES
The connections between the apparatus and the main piping must be
made using stainless steel or cooper pipe with minimum internal
diameter of 8 mm.
Tab.3: Detail of multiple take-off
The installation of a multiple plug on a plant has its aim in in taking
from a single point all the pressure impulse signals that go to the
different reduction- safety devices and to their accessories.
The regulator must be installed in the line with the arrow on the body
pointing in the gas flow direction.
fig. 4
Regulator
Sensingline
EE
On/ofvalve
fig. 5
Bleedcock
Sensingline
EE
Contolpressuregauge
On/offvalve
fig. 6
fig. 7
INSTALLATION AT RIGHT ANGLES
OTHER POSSIBILITIES
IN LINE INSTALLATION
Bleedcock
Controlpressuregauge
Regulator
EE

Tecnical Manual MT 185-E
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It is indispensable for good regulation for the position of the
downstream pressure take-offs and the speed of the gas at the take-off
point respect the value given in table 4.
The regulator, when used in gas pressure reduction stations, has to be
installed at least according to the requirements set forth by the
standards EN 12186 or EN 12279. All points for possible gas relief due
to possible breaks of sensors/diaphragms are to be conveyed
according to standards EN 12186 or EN 12279.
The following is recommended so as to prevent the accumulation of
impurities and condensate in the lines of the pressure take-off.
a) The lines themselves must slope down towards the
downstream piping with a slope of about 5-10%;
b) The connectors on the piping must always be welded on the
top of the piping itself and there must be o burr or inward
protrusions in the hole in the piping.
.
Tab.4
The speed of the gas must not exceed the following
valuesinthepipingdown-streamfromtheregulator:
Vmax = 25 m/s for 1,5 < Pd < 4 bar
Vmax = 20 m/s for 0,5 < Pd ≤ 1, 5 bar
Vmax = 15 m/s for Pd ≤ 0,5 bar
2.3 DOWNSTREAM VOLUME REQUIRED
FOR INSTALLATION
In the case of a service regulator of the ON-OFF type (stopping or
starting of burners), you should remember that though the DIVAL 600
apparatus is classified as being of the fast reaction type, it requires an
appropriately dimensioned volume of gas between the apparatus itself
and the burner so as to partly absorb the pressure swings caused by
fast flow rate variations.
3.0 MODULARITY
The modular-type conception of DIVAL 600 regulators means that it is
also possible to fit the slam-shut incorporated with the body itself even
after the installation of the regulator (only for 4-ways-body version).
3.1 LA/.. INCORPORATED SLAM SHUT
This is a device (fig. 8 and 9) which immediately blocks the gas flow if,
because of some failure, the downstream pressure reaches the point
set for its intervention, or if it is actuated manually.
Wait the DIVAL 600 pressure regulator, the slam-shut be incorporated
on both the service regulator or on the in-line monitor. Three versions
(LA/BP, LA/MP and LA/TR) are available depending on the intervention
pressure ranges
The main features of the slam-shut device are as follows:
Design pressure PS: up to 20 bar;
Intervention for pressure increase and/or decrease;
Intervention accuracy AG: ± 5% of the set point for pressure
increase (based on setting-pressure);
± 15% of the set point for pressure
drop (based on setting-pressure);
internal by-pass device;
manual button-operated actuating device.
fig. 8
N.B. WE RECOMMEND NOT TO PUT ON/OFF
VALVES ON THE IMPULSE TAKE-OFFS

Tecnical Manual MT 185-E
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fig. 9
The slam-shut valve LA/.. consists essentially of an obturator (fig. 9)
fitted on a stem, a releasing lever system, a control head and a manual
resetting system. The pressure to control Pd, in chamber Cof the
control head, acts on the diaphragm 46 which is integral with the cam
shaft 45.
The load of the pressure Pd on the diaphragm is countered by the
springs 34 and 35 which respectively determine intervention for
pressure increase and pressure decrease. The device is set by turning
the rings 17 and 18. Turning the rings clockwise increases the
intervention value; turning anticlockwise decreases it.
Intervention as a result of a pressure increase occurs as follows: when
the pressure Pd exceeds the set point the load on the diaphragm 4
increases until it overcomes the resistance of the spring 34. This
causes the shaft 45 to translate towards the left so that the cam shifts
the feeler 33 and trips the lever mechanism 29. In this way, the stem 5
with the obturator 19 is freed and closed by the spring 8.
On the other hand, intervention as a result of a pressure decrease
occurs as follows: as long as the pressure Pd stays above the load of
the spring 35, the spring support 13 rest on the support 12.
If the pressure Pd drops below the set point, the spring 35 translates
the support 13 to the right and with it the shaft 45.
The cam shifts the feeler 33 and trips the lever mechanism 29. The
slam-shut is reset by unscrewing the bushing 7and pulling it
downwards until the lever system 29 is reset.
During the first phase of the operation, it will be necessary to wait until
the upstream pressure, through the internal by-pass, passes
downstream from the obturator to rebalance it. After resetting, the
bushing 7must be screwed back to its seat.
It is possible to see from the outside whether the slam-shut is open or
closed by observing the position of the nut 37 through in the bushing 7,
as shown in figure 9.
Table 5lists the range ofintervention of the pressure switches
available.
Detail of manual button operated
actuating device
N.B .: L’O-ring is used for specific
version.

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3.2 Tab. 5 LA/… SLAM-SHUT SETTING SPRINGS
Spring characteristics
SLAM-SHUT LA/BP
Code
Colour
De
Lo
d
SETTINGRANGEinmbar
Intervention formax. pressure
64470112RO
RED
43
2.2
30÷50
64470115GR
GREY
34
42
2.8
50÷180
Intervention formin. pressure
64470024BI
WHITE
15
45
1.3
6÷60
SLAM-SHUT LA /MP
Intervention formax. pressure
64470115GR
GREY
42
2.8
140÷180
64470116GI
YELLOW
40
3.2
180÷280
64470051BI
WHITE
34
50
3.2
280÷450
Intervention formin. pressure
64470024BI
WHITE
45
1.3
10÷60
6470038GI
YELLOW
15
40
2
60÷240
SLAM-SHUT LA /TR
Intervention formax. pressure
64470116GI
GREY
40
3.2
250÷550
64470051BI
WHITE
50
3.2
550÷850
64470057BL
BLUE
50
3.5
850÷1500
64470058AR
ORANGE
50
4
1500÷2500
64470059AZ
LIGHTBLUE
50
4.5
2500÷4000
64470060NE
BLACK
34
50
5
4000÷5500
Intervention formin. pressure
64470038GI
YELLOW
40
2
100÷500
64470045MA
BROWN
41
2.4
500÷1000
64470046BL
BLUE
40
3
1000÷2000
64470149NE
BLACK
15
43
3.2
2000÷3500
De = Ø external diameter d= Ø wire diameter Lo = Length

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3.3 DIVAL 600 FUNCTIONING AS A
MONITOR
The monitor is an emergency regulator whose function is to come into
service instead of the main regulator when failure of the latter causes
the downstream pressure to reach the point set for monitor
intervention.
PIETRO FIORENTINI has a solution for this emergency device for in-
line installations.
MONITOR REGULATOR MAIN REGULATOR
fig. 10
3.3.1 CONSTRUCTIVE CHARACTERISTICS
The DIVAL 600 with monitor functions is a regulator which, compared
with the normal version, has a further mobile assembly balancing
device which guarantees greater precision in the regulated pressure
and therefore an equally precise pressure intervention value without
problems of interference with the main regulator.
In this configuration, the monitor regulator has a construction variation
which is illustrated in fig. 11.
fig. 11a fig. 11b
STANDARD REGULATOR MONITOR REGULATOR
3.4 INTEGRATED SILENCER
Thisdeviceallowsastrongnoisedecreasecausedbythereductionofgaspressure.,
whenthisconditionisrequiredbyparticularenvironmentalconditions.
Pressure Regulator Dival 600 can have an integrated silencer both in the normal
versionandintheversionhavingblockvalveoron-linemonitor.
Given the modular conception of the regulator, the silencer can be assembled on
any kind of of Regulator Dival 600 already installed, without having to modify
incomingandoutgoingpipings.Thepressurereductionandregulationmethodisthe
sameasthebase-version-regulator.
fig.12

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4.0 ACCESSORIES
4.1 RELIEF VALVE
The relief valve is a safety device which releases a certain quality of
gas to the exterior when the pressure at the control point exceeds the
set-point as a result of short-lasting events such as, for example, the
very fast closing of the on/off valves and/or overheating of the gas with
zero flow rate demand. The release of the gas to the exterior can, for
example, delay or block the intervention of the slam-shut valves for
transitory reasons deriving from damage to the regulator.
Obviously the quantity of gas released depends on the extent of the
overpressure with respect to the set-point.
The different models of relief valves available are all based on the
same operating principle which is illustrated below with reference to the
valve VS/AM 65 (fig. 12). It is based on the contrast between the thrust
on the diaphragm 24 deriving from the pressure of the gas to control
and the thrust from the setting spring 20. The weight of the mobile
assembly, the static thrust and the residual dynamic thrust on the
obturator 4 also contribute to this contrast. When the thrust deriving
from the pressure of the gas exceeds that of the setting spring, the
obturator 4 is raised and a certain quality of gas is released as a result.
As soon as the pressure drops below the set-point, the obturator
returns to the closed position.
Proceed as indicated below to control and adjust intervention of the
relief valve.
4.1.1 DIRECT INSTALLATION IN THE LINE
(fig. 14).
When the relief valves fitted directly in the line that is, without the
interposition of an on/off valve, we recommend proceeding as
follows:
1) Ensure that the downstream on/off valve V2 and the bled cock
6 are closed;
2) Connect to the cock 6 a controlled auxiliary pressure and
stabilize it to the wished tripping value of the relief valve. Open
the bleed cock 6 with a following increase in the pressure of
the downstream section;
3) Check intervention of the relief valve and ad just it if necessary
by turning the internal adjustment ring 14 appropriately
(clockwise to increase the set-point, anticlockwise to reduce
it).
4.1.2 INSTALLATION WITH ON/OFF VALVE
(fig. 15)
1) Close the on/off valve 16;
2) Connect a controlled auxiliary pressure to the take-off valve 17
and increase it slowly to the envisaged intervention value;
3) Check intervention of the relief valve and ad just it if necessary
by turning the interna adjustment ring 14 appropriately
(clockwise to increase the set-point, anticlockwise to reduce
it).
fig. 13
fig. 14
fig. 15

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5.0 START UP
5.1 GENERAL
After installation, check that the inlet/outlet on/off valves, any by-pass
and the bleed cock are closet.
Before commissioning, you must ensure that the conditions of use
comply with the characteristics of the apparatuses.
These characteristics are recalled by the symbols on the specification
plates applied to each apparatus (fig. 15).
We recommend actuating the opening and closing valves very slowly.
The regulator could be damaged by operations which are too fast.
It is to be noted that pressure regulators with monitoring functions are
identified on the plate by the letters “DIVAL/M”.
APPARATUS SPECIFICATION PLATES
The list of symbols used and their meanings are listed below:
= According to 97/23/CE PED Directive
Pumax= maximum operating pressure at the inlet of the apparatus.
bpu= range of variability of the inlet pressure of the pressure regulator
in normal operating conditions.
PS= maximum pressure for which the body and its inner metallic
partition walls are designed in accordance with the strength
requirements in this document.
Wds= setting range of the pressure regulator which can be obtain
using the parts and the setting spring fitted at the moment of testing
(that is without changing any components of the apparatus.
Wd= setting range of the pressure regulator which can be obtain using
the setting springs indicated in the associated tables and also by
changing some other part of the apparatus (reinforced gasket,
diaphragm, etc.).
Cg and KG = experimental coefficient of critical flow.
AC= regulation class.
SG= closing pressure class.
AG= intervention accuracy.
Wdso= range of intervention for the over pressure of slam-shut which
can be obtain using the setting spring fitted at the moment of testing.
Wdo= range of intervention for the over pressure of slam-shut which
can be obtain using the setting springs indicated in the tables.
Wdsu= range of intervention for pressure decrease of slam-shut which
can be obtain using the setting spring fitted at the moment of testing.
Wdu= range of intervention for pressure decrease of slam-shut which
can be obtain using the setting springs indicated in the tables.
5.2 GAS INPUT, CONTROL OF EXTERNAL
TIGHTNESS AND SETTING
The pressurization of the equipment shall be performed very slowly.
Should not any stabilization procedure be carried out, it is
recommended to keep gas speed in the feeding piping at a value equal
to 5 m/sec during pressurization.
To protect the apparatus from damage, the following operations must
never be carried out:
Pressurization through a valve located downstream from the
apparatus itself.
Depressurization through a valve located upstream from the
apparatus itself.
External tightness is guaranteed if no bubbles form when a foam
medium is applied on the element under pressure.
The regulator and any other apparatuses (slam-shut, monitor) are
normally supplied already set for the desired set-point. It is possible for
various reasons (e.g., vibration during transport) for the settings to be
changed while remaining within the values permitted by the springs
used.
We therefore recommend checking the settings using the procedures
illustrated below.
Tables 6 and 7 give the recommended set-point for the apparatuses in
the various installation arrangements. The figures in these tables can
be useful both when checking existing set-point and for modifying them
should this become necessary later.
In installation consisting of two lines, we suggest commissioning one
line at a time, starting from the one with the lover set-point, known as
the “reserve” line. The set-point of the apparatuses in the line will
obviously deviate from those specified in the tables 6 and 7.
Before commissioning the regulator you must check that all the on/off
valves (inlet, outlet, any by-pass) are closet and that the gas is at a
temperature which will not lead to malfunction.
5.3 COMMISSIONING THE REGULATOR
If there is also a relief valve in the line, refer to par. 4.1 to check it.
fig. 17
1) partially open the downstream bleed cock 6;
2) very slowly open the inlet on/off valve V1;
3) stabilize pressure upstream and downstream; through the
pressure gauge 5 check that the downstream pressure shows
the wished calibration value. Otherwise, adjust the calibration
acting on the proper internal ring nut (fig. 1), rotating it clockwise
to increase and counter-clockwise to decrease;
5) close the bleed cock 6 and verify the tightness of the regulator
and the value of its closing overpressure;
6) check the tightness of all the joints between the on/off valves
V1 and V2 using a foam Solution;
fig. 16

Tecnical Manual MT 185-E
14
7) very slowly open the downstream on /off valve V2, until the line
is completely filled.
5.4 COMMISSIONING THE REGULATOR
WITH INCORPORED LA/.. SLAM-SHUT
If there is also a relief valve in the line, refer to par. 4.1 to check it.
Check and adjust the intervention of the slam-shut 7 as follows:
A) For slam-shut connected to the downstream piping by a
three-ways deviator “push” valve 11, (fig 19) proceed as
follows:
- connect a controlled auxiliary pressure to path C;
- stabilise this pressure at the set point established for the
regulator;
- press knob 1 of the three-way “push” valve completely;
- reset the slam-shut device by means of the provided threaded
bushing;
- keep the knob 1 pressed and:
for safety devices which intervene for maximum pressure:
slowly increase the auxiliary pressure and check the
intervention value. If necessary, increase the intervention
value by turning the adjustment ring 18 clockwise, or
anticlockwise to reduce the intervention value.
for safety devices which intervene for pressure increase and
reduction: slowly increase the auxiliary pressure and record
the intervention value. Restore the pressure to the set point
established for the regulator, and carry out slam-shut reset
operation.
- Check intervention for pressure reduction by slowly reducing
the auxiliary pressure. If necessary, increase the
ntervention values for pressure increase or decrease by
respectively turning the rings 18 and 17 clockwise and vice-
versa to reduce them.
-check proper operation by repeating the operations at
least 2-3 times.
B) On devices without the “push” valve (fig. 20) we recommend
connecting the control head separately to a controlled auxiliary
pressure and repeating the operations described above
.
ATTENTION
At the end oftheoperation,reconnectthecontrol
head tothedownstreampressuretake-off
N.B.: The intervention tests should be repeated at last every months.
At the end of the slam-shut check, proceed as follows:
1) Make sure the block is on closing-position;
2) Open the inlet block valve V1;
3) Open very slowly the block valve, pulling the compass;
4) Partially open the relief faucet 6 placed on the outlet piping;
5) Check, through pressure gauge 5, that the outlet pressure has
the gauging value indicated by the regulator.
If not, it is then necessary to adjust the gauging value, operating
on the internal clamp, rotating it clockwise to increase and anti-
clockwise to decrease;
6) Close the relief faucet 6 and check the value of the closure
pressure;
7) Using a foaming agent, check the capacity of all the joints
placed between block valves V1 and V2;
8) Open very slowly the outlet block valve V2, until the piping gets
completely full;
9) It is advisable to check that, activating the block valve manually,
the line capacity gets stopped.
fig. 18
Safety device
Rest position
(A and B communication)
Controll position
(A and C communication)
Enviroment with the pressare to
keep under control
fig. 19
Chamber with
controlled
pressure
Safety device
Enviroment with the pressare to
keep under control
Chamber with
controlled
pressure
fig. 20

Tecnical Manual MT 185-E
15
Tab. 6
Setting of on-line apparatuses consisting of
regulators Dival 600 + Slam-shut + Relief
valves
Regulator set-
point
(Pds) mbar
Relief
Valve
Slam-shut
Max
Slam-shut
Min
10<Pds≤15
Slam-shut
not available
15<Pds≤19
10 mbar
19<Pds≤24
Pds x 1.7
Pds x 2
Pds x 0.56
24<Pds≤35
Pds x 1.77
Pds x 0.57
35<Pds≤40
Pds x 1.55
Pds x 1.7
40<Pds≤70
Pds x 1.4
70<Pds≤80
Pds x 1.52
80<Pds≤100
Pds x 1.4
100<Pds≤750
Pds x 0.6
750<Pds≤1000
Pds x 1.3
Pds x 1.46
1000<Pds≤2500
Pds x 1.5
2500<Pds<4400
Pds x 1.16
Pds x 1.2
Pds x 0.7
5.5 COMMISSIONING THE REGULATOR
PLUS DIVAL 600 IN LINE MONITOR WITH
INCORPORATED LA/.. SLAM-SHUT
VALVE
If there is also a relief valve in the line, refer to par. 4.1 to check it.
fig. 21
Check and adjust the intervention of the slam-shut 7 as follows:
A) For slam-shuts connected to the downstream piping by a three-
ways deviator “push valve 11, proceed as follows (fig. 19):
- connect a controlled auxiliary pressure to path C;
- stabilise this pressure at the set point established for the regulator;
- press knob 1 of the three-way “push” valve completely;
- reset the slam-shut device by means of the provided threaded
bushing;
- keep the knob 1 pressed and:
for safety devices which intervene for maximum pressure:
slowly increase the auxiliary pressure and check the
intervention value. If necessary, increase the intervention
value by turning the adjustment ring 18 clockwise, or
anticlockwise to reduce the intervention value.
for safety devices which intervene for pressure increase and
reduction: slowly increase the auxiliary pressure and record
the intervention value. Restore the pressure to the setpoint
established for the regulator, and carry out slam-shut reset
operation. Check intervention for pressure reduction by slowly
reducing the auxiliary pressure. If necessary, increase the
intervention values for pressure increase or decrease by
respectively turning the rings 18 and 17 clockwise and vice-
versa to reduce them.
-check proper operation by repeating the operations at least 2-
3 times.
B) On devices without the “push” valve (fig. 20) we recommend
connecting the control head eparately to a controlled auxiliary
pressure and repeating the operations described above.
ATTENTION
At the end oftheoperation,reconnectthecontrol
head tothedownstreampressuretake-off
N.B.: The intervention tests should be repeated at last every months..
At the end of the slam-shut check, proceed as follows:
1) Make sure the block is on closing-position;
2) Partially open the relief faucet 6 placed on the outlet piping;
3) Unplug the impluse plug of the main regulator 2 and tamp the
fitting on the outlet shaft;
4) Open very slowly the block valve V1;
5) Open very slowly the block valve by pulling the compass;
6) Check, through pressure gauge 5, that the outlet pressure has
the fixed gauging value for the regulator monitor 1. If not, adjust
the gauging value operating on the internal clamp, rotating it
clockwise to increase and anti-clockwise to decrease;
7) Close the relief faucet and check the closing pressure value of
the regulator monitor 1;
8) Activate manually the block valve and partially open the relief
faucet 6;
9) Plug in the impulse plug of the main regulator;
10) Open very slowly the block valve, by pulling the compass;
11) Check, through pressure gauge 5, that the outlet pressure has
the gauging value fixed for the main regulator 2. If not, adjust the
gauging value operating on the internal clamp, rotating it
clockwise to increase and anti-clockwise to decrease;
12) Close the relief faucet and check the outlet pressure value of the
main regulator 2;
13) Using a foaming agent, check the capacity of all the joints
placed between block vales V1 and V2;
14) Open very slowly the outlet block valve V2, until the piping gets
completely full;
15) It is advisable to check, that activating manually the block valve,
the line capacity gets stopped.

Tecnical Manual MT 185-E
16
Tab. 7
Settino of on-line apparatuses consisting of regulator Dival 600 + Monitor + Slam-shut +
Relief valve
Regulator set-point
(Pds) mbar
MONITOR
RELIEF VALVE
SLAM SHUT
Max
SLAM-SHUT
Min
10<Pds≤15
Slam-shut not
available
15<Pds≤19
10 mbar
19<Pds≤24
Pds x 1.7
Pds x 2
Pds x 0.56
24<Pds≤35
Pds x 1.77
Pds x 0.57
35<Pds≤40
Pds x 1.55
Pds x 1.7
40<Pds≤70
Pds x 1.4
70<Pds≤80
Pds + 5 mbar
Pds x 1.52
80<Pds≤100
Pds x 1.4
100<Pds≤750
Pds x 0.6
750<Pds≤1000
Pds x 1.15
Pds x 1.3
Pds x 1.46
1000<Pds≤2500
Pds x 1.5
2500<Pds<4400
Pds x 1.07
Pds x 1.16
Pds x 1.2
Pds x 0.7
6.0 TROUBLE-SHOOTING
The problems of various kinds which could arise over time are
highlighted below. They derive from phenomena associated with the
conditions of the gas as well, of course, as with the natural ageing and
wear of the materials.
It must be remembered hat all operations on the apparatuses must be
carried out by highly qualified personnel with appropriate knowledge of
the subject. Tampering with the apparatuses by unsuitable
personnel relieves us from all responsibility of any kind.
You must therefore train your maintenance personnel or avail yourself
of the service centres officially authorised by us..
6.1 Tab. 8 DIVAL 600 REGOLATOR (fig. 22, 23, 24, 25 and 26)
PROBLEM
POSSIBLECAUSES
REMEDY
Valve seat [2] damaged
Replace
Obturator [211] damaged
Replace
O-ring [202] damaged
Replace
O-ring [213] damaged
Replace
O-ring [215] damaged
Replace
Diaphragm [209] damaged
Replace
No tightness at
Q=0
Dirt or foreign bodies in the seal
area
Clean
Anomalous friction of the rod-
obturator
Clean and, if necessary, replace
sealing and/or guide elements
Antipumping valves blockage
Clean and replace if necessary
Pumping
Reduced downstream volumes
Increase volume
Diaphragm [321] breakage
Replace
Increase Pd with
Q>0
Diaphragm [209] breakage
Replace

Tecnical Manual MT 185-E
17
6.2 Tab. 9 SLAM-SHUTH (fig. 27)
PROBLEM
POSSIBLECAUSES
REMEDY
Slam-shut obturator does not
close
Control head diaphragm [16]
ruptured
Change the diaphragm
Obturator gasket [10] deteriorated
Change the gasket
O-ring [66] worn
Change
Leakage from
slam-shut obturator
Obturator seat [7] eroded or pitted
Change the seat
Wrong setting of max and/or
minimum spring
Make the setting again using the rings
[12] and/or [13]
Incorrect intervention
pressure
Friction in lever systems
Change
Persistence of the cause which led
to pressure increase or decrease
downstream
Decrease or decrease the
downstream pressure
Rearming not
possible
Lever systems broken or chipped
Change
N.B. If the slam-shut has intervened, close the inlet and outlet valve
(V1 and V2) in the line and discharge the pressure before carrying out
any operation.
Eliminate the causes which gave rise to intervention before reactivating
it.
In the event of operating problems when personnel qualified for a
specific operation are not available, call the service centre nearest to
you.
For further information contact our SATRI service centre at our
Arcugnano (Vicenza) works

Tecnical Manual MT 185-E
18
7.0 MAINTENANCE
7.1 GENERAL
Periodical inspection and maintenance shall be carried out according
to the regulations in force (kind and frequencies). Before carrying out
any operation it is important to ascertain that the regulator has been
cut off both upstream the regulator and the on/off valves. The
maintenance operations are closely associated with the quality of the
gas transported (impurities, humidity, gasoline, corrosive substances)
and with the efficiency of the filtering.
Preventive maintenance should be carried out at intervals which, if not
established by regulation in force, depend on:
-The quality of the gas transported;
-The cleanliness and conservation of the piping upstream from the
regulator: in general, for example, when starting the equipment for
the first time, more frequent maintenance is required because the
precarious state of cleanliness inside the piping;
-The level of reliability required from the regulation system.
Before starting the disassembly operations on the apparatus you
should check that:
-A set of recommended spares is available. The spares must be
original Fiorentini ones, bearing in mind that the more important
ones such as diaphragms are marked;
-A set of wrenches is available as specified in table 10.
For a proper maintenance the recommended spare arts are
unequivocally identified by labels indicating:
-The No of assembly drawing SR of the apparatus for which the
spare parts are suitable;
-The position showed in the assembly drawing SR of the apparatus.
-We advise to replace all rubber-made parts. In order to do this,
please use the appropriate replacing kit as highlighted with black
spots in the pictures 22, 23, 24, 25, 26 and 27.
N.B. Pietro Fiorentini S.p.A. is in no case responsible, in case of use of
non-original replacements.
Before starting disassembling the equipment, it is also necessary to
make sure that the plant section on which one is working is not
operating upstream or downstream, as well as that the pressure in the
involved piping section has been discharged.
The depressurization manoeuvre has to be carried out paying attention
to discharge the bleed cocks to the drains in a safe area. To avoid the
risk of generating sparks due to bumps of impurity particles within the
discharge lines, it is recommended to keep the fluid speed lower than 5
m/sec.
Moreover, it is suggested to perform reference marks, before
disassembling the equipment, on the parts that may show problems of
mutual orientation or positioning during re-assembly.
Finally, it shall be underlined that the O-rings and the mechanical
sliding parts (stems, etc.) must be lubricated, before re-assembling
them, with a thin layer of silicone grease. Before commissioning, the
external tightness of the equipment has to be tested at a suitable
pressure in order to assure the absence of external leaks.
The internal tightness of the block devices and of the monitors, when
these are used as safety accessories according to the PED Directive,
has to be tested at a suitable pressure in order to assure the internal
tightness at maximum foreseen operating pressure. Such tests are
essential to assure the safe use under the foreseen operating
conditions. They have in any case to comply with the national
regulations in force.
7.2 DIVAL 600 REGULATOR MAINTENANCE
PROCEDURE
PROGRAMMED PREVENTIVE
MAINTENANCE
Procedure for the disassembly, complete replacement of the
spare parts and reassemblyof the DIVAL 600 pressure regulator
+LA/..
PRELIMINARY OPERATION
A. Rendertheregulatorsafe;
B. Ensurethatthepressureupstreamanddownstreamfromitis0..
DISASSEMBLING AND RE-ASSEMBLY
7.3 DIVAL 600 REGULATOR
(fig. 22-23-24-25-26)
1) Unplug the fitting between the regulators and the outlet pressure
plug (impulse plug);

Tecnical Manual MT 185-E
19
2) Completely unscrew the tap (354) and the internal regulating
clamp (352). Then take out the spring (341);
3) Remove the screws (47) that fix the low support cap (310) with
the high support cap(340);
4) Remove the high cap(340);
5) Completely unscrew the screw-nut (332) and take thespring out
(331);
6) Take the membrane-group out (320)
7) Unscrew the screw-nut (324) to dismantle the protection disc
(322), the membrane (321) and the membrane-support (323);
8) Check, by increasing and decreasing, the correct functioning of
the internal levers (301);