Atex FLEX PRO User manual
FLAMELESS VENTING DEVICE
FLEX PRO / FLEX PRO S
2023
1. Generalinformation 7
1.1.
Identification of the user manual 7
1.2.
FLEX classification 7
1.3.
Purposeof the user manual 8
1.4.
Warranty conditions 8
1.5.
Storage 9
1.6.
Terms and definitions 9
2. General safety instructions 10
3. Product description 10
3.1.
Operatingprinciple 11
3.2.
Technicalspecifications 12
3.2.1.
Basic Dimensions of RoundFLEX Devices - type C (FLEX C) 12
3.2.2.
BasicDimensionsoftheRectangularFLEXDevicesoftheRandFtypes(FLEXR/FLEXF) 13
3.2.3.
Materialdesign 14
3.2.4.
Optionalaccessories 15
3.3.
The parameters ensuring the safe use of FLEX accordingtotheATEXcertificate 16
3.4.
Safety zone 17
3.5.
Formationof overpressurein surrounding volume according toEN 16009 18
4. Theinstallationtothe protectedequipment 18
4.1.
General principles for installation 18
4.2.
Generalinstallationguidelines 18
4.3.
Theinstallationtothe protectedequipment 21
5. Openingsignalling device 23
5.1.
Electricalconnection 23
5.2.
Prohibited activities 24
6. Operators,maintenance, and staff training 25
7. Serviceand maintenance 26
7.1.
FLEX serviceafter explosion 27
7.2.
FLEX service inthe event of damagetothemembrane 31
CONTENTS
8. Sparepart list 31
9. Attachments 32
9.1. FLEX PRO (S) signalling connection 24V dr. nr. 4-002-005 32
9.2
FLEX PRO (S) signalling connection 230V dr. nr. 4-002-006 33
Fig. 1- Product designation 10
Fig. 2-An Example of theInstallationof FLEX Devices in theProtectedEquipment 11
Fig. 3- The Drawing of theRound FLEX CDevices 12
Fig. 4 - The Drawing of the Rectangular FLEX R 13
Fig. 5 - The Drawing of the Rectangular FLEX F 14
Fig. 6 -Intrinsically Safe Relay 15
Fig. 7- Protective Bag 15
Fig. 8- Safety Zone forthe Round FLEX Devices 17
Fig. 9 - Safety Zone for the Rectangular FLEX Devices 17
Fig. 10-The AllowedPositioningof theInstallation 19
Fig. 11 -The Proper Positioning of FLEX 19
Fig. 12 - FLEX Grounding 20
Fig. 13-The Exploded Viewof the Rectangular FLEX 22
Fig. 14 -TheExploded Viewof theRound FLEX 22
Fig. 15 - Signalling Device Wiring Diagram 23
Fig. 16- Exploded View 30
PICTURE LIST
TABLE LIST
Tab. 1 –FLEX Classification 7
Tab. 2 –Basic Dimensions of the Round FLEX C Devices 12
Tab. 3 –Basic Dimensions of the Rectangular FLEX R Devices 13
Tab. 4 –Basic Dimensions of the Rectangular FLEX F Devices 14
Tab. 5 –The Parameters Ensuring the Safe Use of FLEX 16
Tab. 6 –Fasteners for the Installation of FLEX 21
1.1.
IDENTIFICATION OF THE USER MANUAL
This user manual is drawn up for the flameless explosion venting device - FLEX (hereinafter referred to
as FLEX) of the dimensional series F1 to F3, R1 to R4 and C1 to C5. The original user manual containing
the operating and maintenance instructions is drawn up in the Czech language; other language versions
are the translations of the original manual. If in any doubts, the original wording of the manual shall be
considered decisive.
The following documents concerning FLEX are also supplied with this manual:
•Delivery note
•EU Declaration of Conformity under 2014/34/EU
•Inspection certificate
•Operational Log
The following can be supplied on request:
•FLEX control sheet
•Drawing of the connecting flanges
•The data sheet of the intrinsically safe relay (if included in the delivery)
1.2.
FLEX CLASSIFICATION
FLEX is designed in accordance with the European Directive 2014/34EU:
Equipment group
II
Explosive
atmosphere
D
Equipment category, interior/exterior
1 D 3G /
3G D
Zone
Interior:
20, 21, 22
Exterior:
2, 22
Tab. 1 –FLEX Classification
The electrical components (intrinsically safe relays) installed in FLEX must be certified to the
appropriate zone or category.
1. GENERAL INFORMATION
1.3.
PURPOSE OF THE USER MANUAL
This user manual is intended for all employees who come into contact with the FLEX during their work.
The user manual is an integral part of the product and the manufacturer cannot be held liable for any
damage or injuries caused as a result of insufficient knowledge of these instructions. Therefore, it is
necessary that the user reads through this manual and any other documents thoroughly and
communicates them to the appropriately qualified personnel (electric, mechanical, technological, safety
engineers and others). The provisions concerning the operation and maintenance should be incorporated
into the operating rules, maintenance schedules and other documents by the user.
If the user is in doubt, he/she should contact the company RSBP spol. s r.o. or its authorized
representative.
The customer should pay increased attention mainly to chapter 4 concerning the proper
installation
because FLEX is the device, whose improper installation, operation and maintenance may
endanger the
human life.
FLEX must be installed and serviced by
qualified and trained personnel using only original
RSBP spare
parts. Installation and service must be performed according to this manual. RSBPassumes no
liability
for defects, damage or malfunction of the supplied products supplied in the case of installation
performed
contrary to the manual or in the case of installation performed by a professionally
incompetent
person.
1.4.
WARRANTY CONDITIONS
This product was manufactured with the most advanced, high-quality materials, and it was thoroughly
inspected before dispatch. However, if any defect or damage occurs during storage, installation,
operation, cleaning or servicing, the user is obliged to notify the manufacturer immediately and in writing.
The manufacturer shall replace the damaged or missing parts of the products in the shortest possible
time. This product is covered by a warranty period of 2 years.
The warranty cannot be exercised in the following situations:
•
The user did not familiarize himself/herself with these operating and maintenance instructions.
•
The product was not used in accordance with these operating and maintenance instructions.
•
The authorized person performed insufficient or improper installation or maintenance.
•
Unsuitable spare parts were used (only the genuine spare parts distributed by the manufacturer can
be used).
•
Inappropriate accessories, which had not been approved by the manufacturer, were used.
The warranty can be exercised only provided that the damaged part, including the description ofthe
defect and the product serial number, will be sent in to the manufacturer’s address.
1.5.
STORAGE
Prior to the installation to the protected technology, the product must be stored in a clean and dry place,
and it must not be exposed to the weather. The product shall be stored in the original packaging. Under
no circumstances can the product be exposed to rain, freeze, dust or any other weather conditions that
affect the functions of the FLEX device. FLEX device store at temperatures from 10 °C to 40 °C.
The user manual must be kept throughout the life of the product and it must be readily accessible to all
employees. If the product is removed from service or sold, it must be handed over tothenew user together
with these user manual. In the event of the loss of these instructions, they can be re-ordered from the
manufacturer.
1.6.
TERMS AND DEFINITIONS
The flameless
explosion venting
device –FLEX
The equipment for
explosionventing
consists of the equipment for explosion venting (membrane) and
the devicefor the absorption of the released energy (FLEX), which
spreads during the dust explosion in a confined space. FLEX
prevents the transmission of the explosion pressure and flame
through the release opening of the membrane,thereby protecting
people and equipment in its vicinity. FLEX must be usedin the
event of the membrane installation inside the building, where the
protected equipment is located.
(membrane) - is the device protecting a vessel or other closed
volumes using the explosion venting –releasing the explosion
pressure to the surroundingspace. The membrane prevents the
explosion pressure inside the vesselor any other closed volumes
from exceeding the structural strength of the vessel and reduces
the explosion pressure to a lower value than the allowablepressure
load-capacity of the vessel.
Opening signalling device
is a device monitoring the position of the membrane
(closing/opening). It works on the principle of breaking the wire
firmly connected with the membrane and passed through a cable
entry in the FLEX body. Upon breaking, the safety circuit is
interrupted and the membrane opening is indicated.
Authorized representative
person authorized by the manufacturer (RSBP) to act as
authorized person.
Trained person
person who has thoroughly familiarized with this manual.
Operational log
document provided on request by RSBP to its products or other
appropriate document of the operator. In the case of using a
different document than supplied by RSBP spol. s r.o. this
document must contain the following information on each
operation on the device FLEX:
•
date and time of the operation
•
what caused the operation (regular service, malfunction …)
•
how the action was solved
•
name and signature of the worker who performed the
operation.
Serial Number
Year of Manufacture
Kst
max
pstat
[bar]
FSA 16 ATEX 1667 X
MADE IN CZECH REPUBLIC
Pikartská 1337/7
716 07 Ostrava-Radvanice, CZ
The user must ensure that the product is used and operated only in a technically perfect condition. It is
necessary to adhere to the recommended deadlines for inspection and maintenance and to provide the
necessary service or repair.
All activities performed on the product must be recorded in the operational log so that the historyof
these works can be checked at any time.
If the explosive atmosphere in the form of a whirled dust cloud occurs in the technology and if the
atmosphere comes into contact with a source of ignition, there may be immediate explosion. FLEX
protects the technology, operators and the environment from the destructive effects of such explosions.
The FLEX devices of the F and R series feature the base, thereforethe rectangular membrane. TheFLEX
devices of the C series feature the base, therefore the round membrane.
Fig. 1 - Product designation
2. GENERAL SAFETY INSTRUCTIONS
3. PRODUCT DESCRIPTION
3.1.
OPERATING PRINCIPLE
The flameless explosion venting device - FLEX consists of the equipment for explosion venting
(membrane) and the device for the absorption of the released energy (FLEX), which spreads during the
dust explosion in a confined space. FLEX prevents the transmission of the explosion pressure and flame
through the release opening of the membrane, thereby protecting people and equipment in its vicinity.
FLEX must be used in the event of the membrane installation inside the building, where the protected
equipment is located. In the event of explosion, FLEX captures the explosion energy (flame, pressure)
coming from the open membrane. Any damage to the product may result in the product failure. This could
cause the transmission of the dust explosion from the protected vessel to the operators’ zone. For this
reason, it is very important to read through these instructions prior to the commencement of the
installation.
The distances of the installed FLEX devices to the adjacent machinery or walls must be approved by the
manufacturer. This distance is required for the proper function of FLEX. The minimum distance between
FLEX and the nearest machinery (or the building wall) must be at least 0,5 m.
1.
FLEX
2.
Filter
Fig. 2 - An Example of the Installation of FLEX Devices in the Protected Equipment
3.2.
TECHNICAL SPECIFICATIONS
Below, there are listed the dimensions of the designs together with the relevant drawings.
3.2.1.
BASIC DIMENSIONS OF ROUND FLEX DEVICES - TYPE C
(FLEX C)
Type
A
[mm]
B
[mm]
C
[mm]
D
[mm]
E
[mm]
F
[mm]
G
[mm]
d - diameter
of openings
[mm]
n –number
of openings
Weight
[kg]
FLEX
C1
PRO
315
580
485
320
350
5
375
11
12
30
FLEX
C1
PRO S
315
879
633
320
350
5
375
11
12
80
FLEX
C2
PRO S
445
107
5
633
450
486
5
525
13
12
87
FLEX
C3
PRO S
505
128
6
705
510
550
6
585
13
20
126
FLEX
C4
PRO S
625
138
5
1020
630
680
6
705
13
20
243
FLEX
C5
PRO
815
221
5
1020
820
860
6
895
13
24
291
Tab. 2 –Basic Dimensions of the Round FLEX C Devices
Fig. 3 - The Drawing of the Round FLEX C Devices
(
&
*
D
$
3.2.2.
BASIC DIMENSIONS OF THE RECTANGULAR FLEX DEVICES
OF THE R AND F TYPES (FLEX R / FLEX F)
Type
A
[мм]
B
[мм]
C
[мм]
D
[мм]
d - diameter of
openings
[mm]
n –number
of openings
Weight
[kg]
FLEX R1
PRO
390
710
635
410
14
18
40
FLEX R2
PRO
540
890
900
580
14
22
74
FLEX R3
PRO
666
1000
1130
735
14
34
109
FLEX R4
PRO
996
1198
1660
1070
14
42
215
Tab. 3 –Basic Dimensions of the Rectangular FLEX R Devices
Fig. 4 - The Drawing of the Rectangular FLEX R
Type
A
[мм]
B
[м
м]
C
[мм]
D
[мм]
d - diameter of
openings
[mm]
n –number of
openings
Weight [kg]
FLEX
F1 PRO
225
675
265
465
14
20
24
FLEX
F2 PRO
305
625
335
530
14
18
28
FLEX
F3 PRO
390
710
420
620
14
18
35
Tab. 4 –Basic Dimensions of the Rectangular FLEX F Devices
Fig. 5 - The Drawing of the Rectangular FLEX F
3.2.3.
MATERIAL DESIGN
FLEX is normally supplied in the material design of structural steel, with the surface treatment KOMAXIT
RAL 9005 (black). Different colors can be supplied upon the customer’s request.
3.2.4.
OPTIONAL ACCESSORIES
a)
The intrinsically safe relay forms the interface between the safe and the hazardous zones (Zone 20).
The intrinsically safe relay requires power supply of 230 V / 50 Hz, protection with the circuit breaker of at
least 1 A (tripping characteristics B or C). The intrinsically safe relay contains a throw-over contact, where
the operational state of the membrane (closed/opened) is signalled.
Fig. 6 - Intrinsically Safe Relay
The intrinsically safe relay can be supplied as an optional accessory (alsoseparately) upon thecustomer’s
requests. For more details, please refer to chapter No. 5.1. The intrinsically safe relay must always be
used with the installation of the FLEX device.
The power supply and control cabling for the intrinsically safe relay is not included in thedelivery
and it should be provided for by the customer (if not agreed otherwise in the contract).
b)
The flange packing (gasket) must be used between the flange of the protected device and the
membrane, which is sealed to theflange of the FLEX device. This gasket supplied by the company RSBP
spol. s r.o., with standard EPDM design and always is included. This gasket can be used in all
commonaplications with the ambiente temperature betwen -40 °C to 80 °C all the time. Forthe application
with special requirements for the features of the gasket, we can supply the gasket made of the material
that meets the requirements. Inthe event that the operator decides to use his/her own gasket, neither the
supplier nor the manufacturer is responsible for the problems related to the its inappropriate selection.
c)
The protective bag is intended to cover the functional area of the FLEX flame filter, so that any
penetration of foreign particles in the filter meshes reducing the functionality of FLEX is prevented. The
protective bag is recommended for the use in dusty premises with the significant clogging risk of the flame
filter. In the event of explosion, the bag breaks and the energy is absorbed without any disturbance.
However, if the bag is damaged, either during the explosion or otherwise, it must be replaced with the
new one.
Fig. 7 - Protective Bag
3.3.
THE PARAMETERS ENSURING THE SAFE USE OF FLEX
ACCORDING TO THE ATEX CERTIFICATE
All relevant parameters are summarized in the Table No. 5. If any other range of ambient temperatures is
required, the manufacturer should be contacted.
Size
Safety zone[m]
Max. KSt
organic dust
[bar∙m/s]
Max. KSt
metallic dust
[bar∙m/s]
Ambient
temperature
[°C]
Operating
temperature*[°C]
FLEX F1
PRO
0.75
235
/
-40 °C
to 60 °C
FLEX F2
PRO
1
220
FLEX F3
PRO
1
-40 °C to 100 °C
FLEX R1
PRO
1
240
or
-40 °C to 240 °C
FLEX R2
PRO
2
220
FLEX R3
PRO
2
FLEX R4
PRO
3
FLEX C1
PRO
1
300
310
-40 °C to 240 °C
FLEX C1
PRO S
1
FLEX C2
PRO S
1
FLEX C3
PRO S
2
150
FLEX C4
PRO S
2
FLEX C5
PRO
2
310
*The operating temperature varies depending on the type of explosion relief device.
Tab. 5 –The Parameters Ensuring the Safe Use of FLEX
In the event of explosion, FLEX must be inspected by the manufacturer or by a trained person; they
should determine the proper servicing, so that the proper function for the further safe use isensured.
A clearance of 0.5 m (or 1 m for FLEX R4) must be maintained in front of the FLEX PRO (S). Placingan obstacle
in the space in front of the flame filter screens may
affect the proper functioning of
the
FLEX
PRO (S).
3.4.
SAFETY ZONE
It is necessary to define the area in front of the free space of the flame filter at a distance of 0.75 m to 3
m, according to the FLEX type, see Tab. 5. This area is called the safety zone and its shape is shown for
each type of device in Fig. 8 and Fig. 9.
The area inside the safety zone may be affected by explosions (increased temperature and pressure,
formation of material combustion products...), and therefore it is not recommended to place equipment in
this area that could be degraded. Entering thesafety zone is allowed in case service work or maintenance
needs tobe done ontheprotectedequipment, but only if appropriatemeasures havebeen takento protect
the operator from possible risks (e.g. shutting down equipment, venting explosive atmospheres,
eliminating explosion hazards inside the equipment, installing protective shields, etc.).
If the safety zone is not respected, neither the supplier nor the manufacturer is liable for any damage to
property or health.
Fig. 8 - Safety Zone for the Round FLEX Devices
Fig. 9 - Safety Zone for the Rectangular FLEX Devices
3.5.
FORMATION OF OVERPRESSURE IN SURROUNDING VOLUME
ACCORDING TO EN 16009
When using the flameless venting device for explosion venting, rises the pressure inside the room where
is such device installed. This effect is obvious especially for installations inside small rooms. In such
situation is necessary to check, if is the room volume according to the volume of protected vessel large
enough, to avoid a damage of this room. Generally, is necessary to consider a reinforcement of the room
if the room is 300x smaller than protected vessel. This is valid for buildings and rooms with common
constructional strength 0.01 bar. This is described within following formula:
V
0
= α.
p
0
V ∆p
Where
p0 is the ambient pressure;
∆p is the maximum pressure rise in the room or building;
α
is the expnasion constant, empirical derivedfrom the gas volume and temperature outside protected
vessel;
V0 is the volume of the room or building;
V is the volume of the protected vessel;
FLEX is supplied assembled. The membrane is sealed and bolted to FLEX. These bolts must be removed
prior to the installation (see chapter 4.3.). The installation of the device shall be carried out according to
the manufacturer’s documents concerning the specific use.
4.1.
GENERAL PRINCIPLES FOR INSTALLATION
Immediately after the delivery and then before the commencement of FLEX installation, the following
basic checks must be performed:
•Check the integrity of the original packaging of FLEX.
•Check the integrity and flawlessness of the top coat of FLEX.
•Check the integrity of the membrane.
•Check whether nofasteners (bolts, nuts, washers) holding the toplid (cover) of FLEXaremissing.
•Check the integrity of the cabling.
•Check the integrity of the supllied bolting materiál for screwing the FLEX to the flange.
•Check the integrity of the supplied flange gasket.
After successful inspection, FLEX is ready to be installed. In the event of any defects or deficiencies,
contact the manufacturer or the distributor immediately.
4. THE INSTALLATION TO THE PROTECTED EQUIPMENT
4.2.
GENERAL INSTALLATION GUIDELINES
A)
Only lifting eyes can be used for the transport and handling FLEX. The lifting eyes of the FLEX
devices of the C and F series are firmly welded to the FLEX structure; as to the FLEX devices of the R
series, they are bolted between the FLEX body and its lid.
B)
The flange of the vessel must have the same connecting dimensions as the FLEX flange and it must
be located, if possible, on the lowest possible branch extrusion, ensuring easy installation and sufficient
strength for carrying the FLEX weight. The pressure resistance of the device must comply with the
legislation relating to the device for explosion venting and flameless explosion venting devices.
C)
Both the sealing faces, both on the FLEX device and on the connecting flange of the vessel, must
be thoroughly cleaned and degreased. The material for the flange gasket (packing) must be fit for the
respective operation and meet all necessary requirements (temperature, chemical resistance, tightness
and others). The gasket is always part of the FLEX device delivery and is EPDM material standard. For
special requirements, the gasket meeting the special requirements of the customer can also be supplied.
D)
The FLEX devices can be installed vertically, horizontally or at an angle. The goal consists in the
prevention of sticking an excessive amount of dust and dirt from the technology on the membrane. The
allowed positioning of the installation is shown in Fig. 10.
Fig. 10 - The Allowed Positioning of the Installation
E)
If FLEX C3, C4 or C5 is positioned otherwise than vertically, the end of the device must be fixed in
the way that the load from the FLEX weight is distributed evenly between both the ends of the device. The
end of FLEX must be hung by the welded eyes on the FLEX cover (lid) using a suitable structure. An
example of such suspension is shown in Fig. 11. The specific fastening method must be discussed with
the manufacturer or the supplier. The dimension of the structure as well as all suspension components
must be fit for the load from the FLEX weight for all FLEX types and sizes. In the event of installation, the
device must also be sufficiently sized to withstand the weight of the FLEX device.
Fig. 11 - The Proper Positioning of FLEX
F)
FLEX must be installed in the way that the membrane is facing the free volume of the protected
vessel. For instance, the space in front of the membrane must not be blocked with filter cartridges or any
other elements.
G)
The equipment for explosion venting (membrane) opening signalling device must be properly
connected in each FLEX, so that the operators can surely distinguish, whether no membrane is opened.
The opening signalling device must always be connected to the intrinsically safe relay. FLEX device is
supplied with an attached equipment for explosion venting and is connected to the opening signalling
device.
H)
In case of outdoor installation, theflameless venting device must be usedtogether withtheprotective
bag supplied by RSBP and must be protected against any ingress or accumulation of dust, snow, ice,
water, dirt, etc. If the flameless venting device is not protected, neither the manufacturer nor the supplier
is liable for the operation of this device.
I)
FLEX grounding must be made using the appropriate grounding element (earth termination, earth
wire), by means of which the earth bolt with one of the flange bolts connecting FLEX with the protected
device is connected. The contact faces for the placement of the earth element must be cleaned
appropriately and their coating must be removed. The fasteners used for attaching the grounding element
to the FLEX earth bolt must be galvanized. Specifically, the nut M8 (ISO 4032), property class 8, and
serrated lock washer (DIN 6798) and plain washer (ISO 7090) - both of them with the size 8. First, the
serrated lock washer should be put on the earth bolt, then thegrounding element, the plain washer; finally
the nutshould be tightened withatorque 15 Nm. Theother end of thegrounding element should be placed
under the head of one of the FLEX flange bolts. Between the grounding element and the actual FLEX, the
serrated lock washer (DIN 6798) of the same size as the flange bolts FLEX must be inserted; tighten with
the same tightening torque as the other flange bolts. The example of the proper grounding isshowninFig.
12.Thegroundingmustcomplywiththelegislativerequirementsof thecountrywhereFLEXis installed. For
FLEX types where the transition piece(FLEX C1PRO S and FLEX C4 PRO S) is used,it sialso necessary
to ground this transition piece and FLEX itself. The transition piece i salso welded witha grounding screw
(just like teh FLEX device).
1.
Fasteners
2.
Grounding element (earth terminal/wire)
3.
Fasteners of FLEX and the protected vessel
Fig. 12 - FLEX Grounding
FLEX should be connected to the prepared flange on the vessel using the fasteners listed in table No. 6.
In this table, all types of bolts, nuts and washers necessary for the proper installation must be listed. All
fasteners must be galvanized, the property class of bolts must be 8.8 (ISO 4017) and the property class
of nuts must be 8 (ISO 7040). The washers (ISO 7090) should be put under the nut. The table also shows
the specific tightening torques for individual bolts. Bolting material is part of the FLEX device delivery.
FLEX
Number of bolts,
nuts and washers
[pcs]
Bolt ISO 4017
- 8.8 - A3L
Nut ISO
7040 - 8 - A3L
Washer
ISO 7090
- A3L
Tightening
torque
[N∙m]
F1 PRO
20
M10 x 35
M10
10
21
F2 PRO
18
M10 x 35
M10
10
21
F3 PRO
18
M10 x 35
M10
10
21
R1 PRO
18
M10 x 35
M10
10
21
R2 PRO
22
M10 x 35
M10
10
21
R3 PRO
34
M10 x 35
M10
10
21
R4 PRO
42
M10 x 35
M10
10
21
C1 PRO
12
M8 x 30
M8
8
15
C1 PROS
12
M8 x 30
M8
8
15
C2 PROS
12
M10 x 35
M10
10
21
C3 PROS
20
M10 x 35
M10
10
21
C4 PROS
20
M10 x 40
M10
10
21
C5 PRO
24
M10 x 40
M10
10
21
Tab. 6 –Fasteners for the Installation of FLEX
4.3.
THE INSTALLATION TO THE PROTECTED EQUIPMENT
The installation of the FLEX device can be summarized in the following steps:
1. Removing the transport bolts (ISO 10642) which, together with the sealant, hold the membrane
firmly on the FLEX body.
2. Cleaning and degreasing of the flange contact face on the vessel and the FLEX device (the
underside of the membrane). Do not remove the membrane! Leave it intact, sealed to the
underside of FLEX.
3. Theinstallation of theappropriateflange gasket, either thegasket supplied by the company RSBP
spol. s r.o., or thecustomer’s own gasket. Incaseof problem with own gasket for any complication
caused by the manufacturer or supplier has no responsibility.
4. For FLEX C3, C4, C5 or any other type or size, for which it was decided that the following
procedure is required due to the total size of the protected device, the FLEX devices should be
supported (suspended); see chapter 4.2. (E).
5. Strong tightening of the flange bolts listed in table No. 6 using the prescribed tightening torque,
except for the selected bolt which is intended for the connection of the other end of the grounding
element; see chapter 4.2. (I).
6. For the FLEX device mentioned under 4, the suspension of the overhanging end of FLEX on the
prepared structure; see chapter 4.2. (E).
7. Grounding of the flameless device, see the previous chapter (I) and Fig. 12.
This manual suits for next models
14
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