PIETRO FIORENTINI REVAL 182 User manual

PRESSURE REGULATOR
REVAL 182
TECHNICAL MANUAL MT043
INSTALLATION, COMMISSIONING AND MAINTENANCE INSTRUCTIONS
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TECHNICAL MANUAL MT043
REVAL 182
INLET PRESSURE
OUTLET PRESSURE PILOT FEED
MOTORIZATION
RR 40
P90
R14/A
204/A
Issue November 2002
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TECHNICAL MANUAL MT043
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The PIETRO FIORENTINI SPA with registered office in Milan (Italy) – via Rosellini, 1, declares under its sole
responsibility that the apparatus series Reval 182 bearing the CE marking showed in this manual are designed,
manufactured, tested and inspected in accordance with the provisions of Pressure Equipment Directive 97/23/EC
(PED).
Following conformity assessment procedure has been carried out:
➤EC type-examination (module B) by DVGW (ID n°0085) –report 02/133/4301/855 issued 30th April 2002.
In this report all versions are classified as safety accessories according to clause 2.1.3 of art. 1 of PED.
➤Production quality assurance (module D) by BUREAU VERITAS (ID n°0062) –Attestation d’Approbation
du Système QualitéN°CE-PED-D-FIO001-02-ITA Rev. A issued 15th May 2002.
Further it declares that the classification of the performances characteristics has been verified by DVGW
according to the procedures given by European standard EN 334 and/or by standard DIN 3381. The classification is
detailed in the aforesaid DVGW report.
Arcugnano 25/9/2002 The Pietro Fiorentini SpA
DECLARATION OF CONFORMITY
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TECHNICAL MANUAL MT043
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GENERAL PRECAUTIONS
- 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).
PRECAUTIONS 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 so 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 trasportation of equipment 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 occured to any
goods. If damage occured inform the supplier and keep packing for any verification.
INSTALLATION
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.
PRECAUTIONS
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TECHNICAL MANUAL MT043
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 regulators series Reval 182 are classified as fail close regulator according to the standard EN 334
therefore they are categorized as safety accessory according to directive 97/23/EC (PED).
The incorporated safety device monitor PM/182 (as well as the in-line monitor REVAL 182) being classified as fail
close regulators according to the standard EN 334 is categorized as safety accessory according PED, therefore it
can be used both as pressure accessory and safety accessory to PED. The regulator Reval 182 when incorporating
slam shut valve SB/82 or VB/93 with pressure switches for overpressure is categorized as safety accessory
according to PED, therefore it can be used both as pressure accessory and safety accessory to PED.
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 12286.
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TECHNICAL MANUAL MT043
1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PAGE 9
1.1 MAIN SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.2 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.2.1 REGULATOR WITH PILOT P...+RR40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.2.2 REGULATOR WITH PILOT 204/A+R14/A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.3 SETTING SPRINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.0 INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.0 ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.1 RELIEF VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.1.1 DIRECT INSTALLATION IN THE LINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.1.2 INSTALLATION WITH ON/OFF VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.2 ACCELERATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.0 MODULARITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.1 INCORPORATED SLAM-SHUT VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.2 INCORPORATED SB/82 SLAM-SHUT VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.2.1 SB/82 SLAM-SHUT OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.2.2 SB/82 SETTING SPRINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.3 INCORPORATED SLAM-SHUT VB/93 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.3.1 VB/93 SLAM-SHUT OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.3.2 VB/93 SETTING SPRINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.4 MONITOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.4.1 PM/819 INCORPORATED MONITOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.4.2 IN-LINE MONITOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.0 START UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.2 GAS INPUT, CONTROL OF EXTERNAL TIGHTNESS AND SETTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.3 COMISSIONING THE REGULATOR REVAL 182 WITH PILOT P90+RR4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.4 COMMISSIONING THE REGULATOR WITH INCORPORATED VB/93 SLAM-SHUT . . . . . . . . . . . . . . . . . . . . . . . 31
5.5 COMMISSIONING THE REGULATOR WITH INCORPORATED PM/182 MONITOR AND . . . . . . . . . . . . . . . . . . . . . .
ACCELERATING VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.6 COMMISSIONING THE REGULATOR PLUS REVAL 182 IN-LINE MONITOR WITH VB/93 . . . . . . . . . . . . . . . . . . . .
SLUM-SHUT VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.0 TROUBLE-SHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6.1 REVAL 182 REGULATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6.2 VB/93 SLAM-SHUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6.3 SB/82 SLAM-SHUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
7.0 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
7.1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
7.2 REVAL 182 REGULATOR MAINTENANCE PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
7.3 PM/819 MONITOR MAINTENANCE PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
7.4 DB/182 SILENCER MAINTENANCE PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
7.5 VB/93 SLAM-SHUT MAINTENANCE PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
7.6 SB/82 SLAM-SHUT MAINTENANCE PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
8.0 FINAL OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
8.1 THIGHTNESS AND SETTING CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
8.2 START UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
9.0 WEIGHT OF THE COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
9.1 WEIGHT OF THE COMPONENTS IN KG. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
10.0 LIST OF RECOMMENDED SPARES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
INDEX
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TECHNICAL MANUAL MT043
The scope of this manual is to provide essential information for the commissioning, disassembly, re-assembly and
maintenance of the REVAL 182 regulator.
At the same time we consider it appropriate to provide a brief illustration of the main features of the regulator and
its accessories.
1.1 MAIN SPECIFICATIONS
The REVAL 182 pressure regulator is a regulator for medium and low pressures.
The REVAL 182 a fail closed type regulator and therefore closed in event of:
- rupture of the main diaphragm;
- rupture of the pilot diaphragm;
- no feed in the pilot circuit.
The main specifications of this regulator are:
•Design pressure: up to 18.9 bar
•Working temperature range: -10°C to +60 °C (higher or lower temperatures on request);
•Ambient temperature: -20 °C to +60 °C;
•Inlet pressure range bpe: 0.5 to 16 bar
•Regulating range possible Wh: 0.006 to 12 bar (depending on the pilot installed);
•Minimum differential pressure: 0.1 bar;
•Precision class RG: up to 2.5;
•Closing pressure class SG: up to 5.
1.2 OPERATION
1.2.1 REGULATOR WITH PILOT P...+RR40 (fig. 1)
In the absence of pressure, the obturator 5 is maintained in the closed position by the spring 54, and rests on the
reinforced gasket 7. The upstream pressure, even if variable, does not change this position as the obturator is
completely balanced and is therefore subject to equal pressures, even if the sections are different.
The rod 6 is also between two equal pressures as the pressure upstream is also conveyed to the chamber C
through the hole A.
The obturator is controlled by the diaphragm 50 on which the following forces act:
•downwards: the load of the spring 54, the thrust deriving from the regulated pressure Pa in the chamber D and
the weight of the mobile assembly.
•upwards: the thrust deriving from the motorisation pressure Pm in the chamber E, supplied by the pilot.
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1.0 INTRODUCTION
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TECHNICAL MANUAL MT043
10
Fig. 1
Connections to be made by the customer
The motorisation pressure is obtained by drawing gas from the regulator at the upstream pressure.
The gas is filtered through the incorporated filter 28 and is subjected to initial decompression in the adjustable
pre-regulator RR40 (fig. 2) composed essentially of an obturator 31, a spring 40 and a diaphragm 25 to a value,
Pep, which depends on the pressure set-point of the regulator. Pep is adjusted by turning the ring 10 (clockwise
to increase, anticlockwise to reduce), and its value can be read on the pressure gauge fitted directly on the body.
The pressure, Pep, then passes from the chamber G through the hole F in the P90 incorporated pilot which adjusts
it by means of the obturator 17 until the inlet value, Pm, in the head of the regulator.
The regulation of Pm is obtained by the comparison of the force exerted by the setting spring 71 of the pilot and
the action of the regulated pressure, Pa, acting in the chamber B on the diaphragm 23.
The set-point can be changed by turning the adjustment ring 11; clockwise rotation increases Pm and therefore
the regulated pressure, Pa; the opposite occurs when the ring is turned anticlockwise. If, for example, the
downstream pressure, Pa, drops during operation (because of an increase in the requested flow rate or a drop in
the upstream pressure) an imbalance occurs in the mobile assembly 16 of the pilot, which is displaced to increase
the opening of the obturator 17. As a result, the motorisation pressure value, Pm, increases and, by acting in the
chamber E under the diaphragm 50 (fig. 1), causes the obturator 5 to move upwards and therefore an
increase in the opening of the regulator until the set-point of the regulated pressure is restored. Vice versa, when
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TECHNICAL MANUAL MT043
11
Fig. 2
P9 Regulation ring
RR40 Regulation ring
vent
vent
the regulated pressure begins to increase, the force it exerts on the diaphragm 23 of the pilot moves the mobile
assembly 16 displacing the obturator 17 towards the closed position. The pressure, Pm, then drops because of
the transfer between the chambers E and D through the orifice 21, and the force exerted by the spring 54 causes
the downward displacement of the obturator 5, to restore the regulated pressure to the set-point. In normal
working conditions, the obturator 17 of the pilot positions itself so that the motorisation pressure value, Pm, is
such as to maintain the downstream pressure value, Pa, around the set-point.
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TECHNICAL MANUAL MT043
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1.2.2 REGULATOR WITH PILOT 204/A+R14/A (fig. 3)
In the absence of pressure, the obturator 5 is maintained in the closed position by the spring 54, and rests on the
reinforced gasket 7 (fig. 3). The upstream pressure, even if variable, does not change this position as the obturator
is completely balanced and is therefore subject to equal pressures, even if the sections are different.
The rod 6 is also between two equal pressures as the pressure upstream is also conveyed to the chamber C
through the hole A.
The obturator is controlled by the diaphragm 50 on which the following forces act:
•downwards: the load of the spring 54, the thrust deriving from the regulated pressure Pa in the chamber D and
the weight of the mobile assembly.
•upwards: the thrust deriving from the motorisation pressure Pm in the chamber E, supplied by the pilot.
The motorisation pressure is obtained by drawing gas from the regulator at the upstream pressure.
The gas is filtered through the filter 13 and is subjected to initial decompression in the pre-regulator R14/A (fig.
4) composed essentially of an obturator 5, a spring 12 and a diaphragm 10 to a value, Pep, which depends on the
pressure set-point of the regulator. The pressure, Pep, then passes from the chamber G into in the 204/A pilot
which adjusts it by means of the obturator 17 until the inlet value, Pm, in the head of the regulator. The regulation
of Pm is obtained by the comparison of the force exerted by the setting spring 22 of the pilot and the action of the
regulated pressure, Pa, acting in the chamber B on the diaphragm 16.
Connections to be made by the customer
Fig. 3
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TECHNICAL MANUAL MT043
13
Fig. 4
The set-point can be changed by turning the adjustment screw 10; clockwise rotation increases Pm and therefore
the regulated pressure, Pa; the opposite occurs when the ring is turned anticlockwise. If, for example, the
downstream pressure, Pa, drops during operation (because of an increase in the requested flow rate or a drop in
the upstream pressure) an imbalance occurs in the mobile assembly 15 of the pilot, which is displaced to increase
the opening of the obturator 17. As a result, the motorisation pressure value, Pm, increases and, by acting in the
chamber E under the diaphragm 50 (fig. 3), causes the obturator 5 to move upwards and therefore an increase in
the opening of the regulator until the set-point of the regulated pressure is restored.
Vice versa, when the regulated pressure begins to increase, the force it exerts on the diaphragm 16 of the pilot
moves the mobile assembly 15 displacing the obturator 17 towards the closed position. The pres-sure Pm then
drops because of the transfer between the chambers E and D through the orifice 21, and the force exerted by the
spring 54 causes the downwar displacement of the obturator 5, to restore the regulated pressure to the set-point.
In normal working conditions, the obturator 17 of the pilot positions itself so that the motorisation pressure value
Pm is such as to maintain the downstream pressure value Pa around the set-point.
vent
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TECHNICAL MANUAL MT043
14
1.3 SETTING SPRINGS
The REVAL 182 regulator uses the P90, P92 and 204/A pilots. The regulation range of the different pilots is given
in the tables below.
Tab. 1 RR40 Setting springs pre-regulator
Code Colour De Lo d i it Setting range in bar
1 2700338 WHITE 1.3 8.5 10.75 0.11 ÷0.22
2 2700375 YELLOW 40 1.5 6.5 8.75 0.22 ÷0.58
3 2700464 ORANGE 15 1.7 8.5 10.5 0.5 ÷0.86
4 2700510 RED 2 5.25 7.25 0.85 ÷2
5 2700745 GREEN 35 2.5 5.5 7.25 1.95 ÷4.7
6 2700980 BLACK 3 6 8 4.6 ÷8.2
N.B.: Sett-point pre-regulator: Pep= Pa + (0.15 ÷ 0.2) bar
Tab. 2 Pilots P90-92 setting springs
P90 PILOT
Code Colour De Lo d i it Setting range in mbar
1 2700400 WHITE 1.5 7 9 6 ÷15
2 2700545 YELLOW 25 55 2 7.5 9.5 14 ÷50
3 2700790 ORANGE 2.5 8 10 49 ÷120
4 2701010 RED 3 6.5 8.5 110 ÷270
P92 PILOT
1 2701010 RED 25 55 3 7 8.5 260 ÷660
2 2701225 GREEN 3.5 6 8 650 ÷1110
Tab. 3 Pilot 204/A setting springs
Code Colour De Lo d i it Setting range in mbar
1 2701260 WHITE 3.5 5.50 7.50 300 ÷1200
2 2701530 YELLOW 35 60 4 5.00 7.00 700 ÷2800
3 2702070 ORANGE 5 5.00 7.00 1500 ÷7000
4 2702450 RED 6 5.00 7.00 4000 ÷12000
De = external diameter d = wire diameter i = active coils Lo = Spring length it = total coils
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TECHNICAL MANUAL MT043
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 MIPd ≤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;
- the upstream and downstream piping is at the same level and capable of supporting the weight of the regulator;
- 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 normally raccomended set-up is:
15
2.0 INSTALLATION
Fig. 5 (Standard regulator)
Fig. 6 (Overturned regulator)
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TECHNICAL MANUAL MT043
16
INSTALLATION AT RIGHT ANGLES
IN-LINE INSTALLATION
TAB. 4 CONNECTING THE APPARATUSES
The connections between the apparatus and the main piping must be made using stainless steel or copper pipe
with minimum internal diameter of 8 mm.
Regulator Sensing line
Downstream connection
Control pressure gauge
Bleed clock
On/Off valve
Regulator
Downstream connection
Sensing line
Control pressure gauge
On/Off valve
Bleed clock
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TECHNICAL MANUAL MT043
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1and 2Connect to regulators heads
3and 4Connect to pilots
5and 6Connect to accelerator and slam-shut
The regulator must be installed in the line with the arrow on the body pointing in the gas flow direction.
It is indispensable for good regulation that the position of the downstream pressure take-offs and the speed of the
gas at the take-off point respect the values given in tables 4 and 5 (positioning) and 6 (speed).
The pressure regulator, when installed on a reducing station, shall be installed at least according to the
requirements of standard EN 12186.
All venting connections shall be connected as required by above mentioned standard.
The following is recommended so as to prevent the accumulation of impurities and condensate in the lines
of the pressure take-offs:
a) the lines themselves must slope down towards the downstream piping connectors 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 no burr
or inward protrusions in the hole in the piping.
NB.WE RECOMMEND NOT TO PUT ON/OFF VALVES ON THE IMPULSE TAKE-OFFS
TAB. 5 DETAIL OF MULTIPLE TAKE - OFF WITH OF THE IMPULSE TAKE - OFF REFERENCE NUMBERS
TAB. 6
The speed of the gas must not exceed the following values in the piping downstream from the regulator:
Vmax= 30 m/s for Pa > 5 bar
Vmax= 25 m/s for 0,5 < Pa < 5 bar
Vmax= 15 m/s for Pa < 0,5 bar
3.0 ACCESSORIES
3.1 RELIEF VALVE
The relief valve is a safety device which releases a certain quantity 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 intervention of the slam-shut valve for transitory reasons deriving from damage
to the regulator.
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Fig. 7
Obviously the quantity of gas released depends on the extent of the overpressure with respect to the set-point. The
different models of relief valve available are all based on the same operating principle which is illustrated below
with reference to the valve VS/AM 55 (fig. 7).
It is based on the contrast between the thrust on the diaphragm 24 deriving from the pressure of the gas to being
controlled 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 quantity 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.
3.1.1 DIRECT INSTALLATION IN THE LINE (FIG. 8)
When the relief valve is fitted directly in the line, that is without inserting an on-off valve, proceed as follows:
1) Ensure that the downstream on-off valve V2 and the bleed cock 6 are closed.
2) Increase the pressure in the downstream section up to the value envisaged for intervention in one of the
following ways:
- if the spring fitted on the pilot permits it (see tables 1-2-3), increase the setting of the pilot itself until the
desired value is obtained;
- connect a controlled auxiliary pressure to the cock 6 and stabilize it at the desired value;
3) Check the intervention of the relief valve and adjust it if necessary by turning the adjustament ring 14
appropriately (clockwise to increase and anticlockwise to decrease).
Fig. 8
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TECHNICAL MANUAL MT043
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3.1.2 INSTALLATION WITH ON/OFF VALVE (FIG. 9)
1) Close the on-off valve 16.
2) Connect a controlled auxiliary pressure to the nipple 17 and increase it slowly up to the value envisaged for
intervention.
3) Check the intervention of the relief valve and adjust if necessary by turning the adjustament ring 14
appropriately (clockwise to increase and anticlockwise to decrease).
3.2 ACCELERATOR
An accelerator (fig. 10) is installed on the PM/182 icorporated monitor and on the REVAL 182 regulator (use as
in-line monitor) to speed up their intervention in the event of failure of the active regulator (racommended when
used safety accessory according to Directive 97/23/EC “PED”).
On the basis of a pressure signal from downstream this device discharges the gas into the monitor's motorization
chamber into the atmosphere, thereby permitting rapid intervention. The set point of the accelerator must
obviously be higher than that of the monitor.
Setting is made by turning the adjustment screw ring 1, clockwise to increase the value, anticlockwise to reduce it.
Two models are available:
1. V/25 range of intervention Who: 15 ÷600 mbar;
2. M/A range of intervention starting from 550 mbar.
Fig. 10
Accelerator V/25
vent
Fig. 9
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4.0 MODULARITY
The modular-type design of REVAL 182 series regulators means that it is also possible to feitner the emergency
monitor regulator PM/182 or it the slam-shut incorporated with the body itself even after the installation of the
regulator without any modifications.
4.1 INCORPORATED SLAM-SHUT VALVE
When closing the slam shut incorporated into pressure regulator to be considered as safety accessory according
to Directive PED, cuts off the feeding of gas both to pressure regulator and to its pilot.
4.2 INCORPORATED SB/82 SLAM-SHUT VALVE
This is a device (fig. 11) which immediately blocks the gas flow if, following some kind of failure, the downstream
pressure reaches the set-point for its intervention, or is operated manually.
On the REVAL 182 regulator, it is possible to have the SB/82 slam-shut incorporated both with the service regulator
and on the one functioning as in-line monitor.
The main characteristics of the slam-shut device are:
•intervention with pressure increase and/or decrease;
•design pressure: 100 bar for all the components;
•intervention accuracy (AG): ± 1% of the pressure set-point for pressure increases; ± 5% for pressure drops;
•manual resetting with internal by-pass operated by the resetting lever.
Fig. 11
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