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Installation, Operation & Maintenance
Model 7678
End of Line Deflagration Flame Arrester
ATEX Certified
January 2, 2012
IOM-7678
Rev. A 12187
Ref. 97290
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Table of Contents
CERTIFICATION
Section Page
Introduction 2
Certification 2
Integrated Temperature Sensor 2
Design & Function 2
Installation 3
Maintenance 4
Model Identification 6
Product Limited Warranty 6
Tables
Bolt torque 3 & 4
MESG tables 5
Attachments
ATEX Declaration of Conformity
Cert. # IBExU12ATEX2019 X
Drawings SCH-7678-01
INTRODUCTION
This manual is intended to provide
recommended procedures and practices for
installation, operation and maintenance of the
Groth Model 7678 end of line deflagration flame
arrester. Any standard procedures and practices
developed for a specific plant or process should
supersede this manual. Although this manual
cannot cover all possible contingencies,
following these guidelines will provide safe,
reliable deflagration flame arrester service.
The arrester shall be treated as a safety device
and must be maintained by a knowledgeable
repair technician. Carefully read and understand
this manual before installing or servicing this
product.
For information not contained in this manual,
please contact:
Groth Corporation
13650 North Promenade Blvd.
Stafford, TX 77477
281-295 6800
281-295-6999 Fax
Groth Model 7678 end of line deflagration flame
arresters are manufactured in compliance with
the ATEX Directive 94/4/EC, as confirmed by
Certificate IBExU12ATEX2019 X. This
certification covers the following sizes, materials
and limits for use.
Sizes included are all those shown on drawing
SCH-7678-01. Materials included are all
materials that satisfy the strength and pressure
ratings specified on these drawings.
These arresters are suitable for end of line
Explosion Gas Group
MESG of vapor
≥
0.036” [0.90 mm]
IIA
mixture
Operating
o
F to 140oF [-20oC to 60oC]
–4
Temperature
Maximum Allowable Burn
Time
*Temperature
Sensor
Emergency
Function
Connection
Burn Time Trigger Time
Size
2”-12”
2 Minutes 60 Second
(50-300mm)
deflagrations and short time burning.
*
Each temperature sensor with respect to connection size
has a trigger emergency function within half of the burn
time.
Must be installed with integrated temperature
sensor(s), Groth P/N 93219005 or equal.
INTEGRATED TEMPERATURE SENSORS
Flame arresters for short time burning must
be fitted with one or more integrated
temperature sensors, taking into account the
intended orientation of the flame arrester.
These arresters may be used in systems and
situations where the flow of the flammable
mixture can be stopped within one minute.
Groth model 7678 flame arresters were
tested with one Groth integrated temperature
sensor, P/N 93219005, installed on the
ignition side. All arresters are manufactured
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with a minimum of either one thermowell or
one thermocouple port, positioned to align
the thermocouple with the face of the
element. Multiple thermowells or ports may
be on one or both faces as specified by the
purchaser. Groth temperature sensors may
also be installed as specified.
If the purchaser installs an integrated
temperature sensor, it must be an ATEX
approved devise, installed so that the sensor
contacts the bottom of the thermowell or the
face of the element.
DESIGN AND FUNCTION
See “INTEGRATED TEMPERATURE SENSORS”
These devices can activate warning or shutdown
systems if abnormal conditions are detected.
The weatherhood may be removed for in-place
maintenance of the element, or element removal
may be required for inspection/maintenance.
INSTALLATION
Operating Conditions:
Based on the testing conditions, this series of
end of line deflagration flame arresters may be
installed in systems where:
Groth's end of line deflagration flame arresters
are designed to prevent flame propagation in
gas piping systems which contain flammable
gas/vapor mixtures. The arrester must prevent
flame passage under certain specified
conditions while permitting free flow of
gas/vapor through the system. Thus it protects
vulnerable equipment or components of the
system from damage due to explosive pressures
caused by gas/vapor ignition from outside of the
system. The end of line deflagration flame
arrester must be used under only those
operating conditions for which it was designed
and tested.
The flame arresters consist of two main
components: the arrester base and the flame
element housing assembly. The base serves as
the connecting interface to the piping system.
The housing retains and supports the flame
element. Both components are essential in
stopping the passage of the flame.
The flame element is comprised of small parallel
passageways aligned so that an approaching
flame front is slowed down and then quenched
before it can propagate to the protected side of
the device. All Groth flame elements utilize spiral
wound, crimped ribbon constructed of corrosion
resistant materials, to ensure the best flame
quenching performance with minimum pressure
drop. The element is supported by rigid beams,
securely welded into the housing.
Depending on the design of the system in which
it is used, the arrester bases can include
optional ports for thermocouples or pressure
monitoring devices.
1. The MESG of the vapor constituent(s) is
greater than or equal to .036" (0.90 mm).
2. Normal operating temperature is between
o
-4
F (-20o C) and 140o F (60o C).
3. The tank or piping system to which the flame
arrester is to be installed must not exceed
the arrester flange size.
WARNING
The 7678 end of line deflagration flame
arrester may NOT be effective in stopping
flame propagation in systems which contain
vapors with an MESG less than 0.036" [0.90
mm] or when any of the operating conditions
are exceeded.
All Groth end of line deflagration flame arresters
are designed for vertical installation but will
function equally well in a horizontal orientation.
WARNING
The flame arrester housings or adjacent
piping may have various pipe taps for
pressure sensing, temperature sensing,
condensate drainage, etc. Never connect
such taps to a common line or system as
this could provide a flame bypass around the
flame arrester element.
This series of flame arresters all have 150#
ANSI flanges. Please follow the torque
guidelines listed in Table 1 for flange make-up
torque.
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Table 1
Note
When transporting the arrester, support it
with the flange in the horizontal position.
This position provides the maximum support
for the flame element winding. Lift the
assembly with the [2] lifting eyes if
applicable.
The following guidelines should be observed at
installation:
1. Remove any flange protectors and discard
all packing material.
2. Inspect the gasket seating surface of the
mating flanges. It must be clean, flat, free of
scratches, corrosion and tool marks.
3. Inspect the gasket; make sure that the
material is suitable for the application.
4. Lubricate all studs and nuts with an
appropriate thread lubricant. If the arrester
will see high temperature service or stainless
steel fasteners are used, select an anti-seize
compound such as moly-disulfide.
5. Center the gasket within the bolt circle.
PIPE FLANGE STUD TORQUE CHART
Lb.Ft. [Nm]
Size
(mm)
2”
Flat face Raised face
60 [82] 60 [82]
Torque
(50mm)
3”
60 [82] 60 [82]
(75mm)
4”
60 [82] 60 [82]
(100mm)
6”
105 [143] 105 [143]
(150mm)
8”
105 [143] 105 [143]
(200mm)
10”
140 [190] 170 [231]
(250mm)
12”
140 [190] 170 [231]
(300mm)
•
(Torque is an average value based on a
nitrile binder synthetic gasket, 1/32" thick
and lubricated threads).
WARNING
The lifting eyes on the element housing
are to be used for handling the housing
only during inspection and maintenance. DO NOT use these eyes to lift the
entire flame arrester assembly.
6. Set the arrester on its mating flange or
nozzle. Position the lifting handles and
jacking nuts to facilitate future removal of the
flame arrester housing. Position the drain
and instrument ports to provide proper
access and function. (See Maintenance
Instructions). Install the studs and tighten
nuts hand tight.
7. Torque all fasteners to half the value listed in
Table 1 in a staggered, alternating pattern to
provide an evenly compressed gasket joint.
8. Make up the final torque and check that no
further nut rotation occurs at the specified
torque value.
MAINTENANCE
For maximum operating efficiency the element
of a flame arrester must be inspected and
maintained at regular intervals. Frequency of
inspection should be based on the experience
gained in each application. Inspection of wetted
components is recommended at least once per
year or any time that one of the following
conditions occur:
•
Excessive pressure drop is encountered at a
known flow rate.
•
A flame front is detected.
Maintenance is accomplished by removing the
element assembly for inspection and cleaning or
replacement.
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1. Loosen the hex nuts and remove the
weatherhood.
2. Remove the hex nuts and retainer plate,
and studs if necessary to remove element
housing.
2. When removing the element housing for
maintenance, support the weight by
attachment to the housing handles, or lifting
eyes.
WARNING
The lifting eyes on the element housing are
to be used for handling the housing only
during inspection and mainte-nance. DO
NOT use these eyes to lift the entire flame
arrester assembly.
In a horizontal installation, the element
housing should be supported before
removing the studs. Use structures and
equipment suitable for supporting the
components weight. The weight is noted on
the drawing attached to this manual.
4. Remove the housing assembly for
inspection. The flame element and
supporting grids shall be visually inspected
for damage or corrosion build-up from both
sides. If the flame element appears to be
damaged, it should be replaced immediately
with a new one.
5. Verify that the element openings are not
obstructed by viewing a light source through
the element passages. If the flame element
is dirty it can be cleaned by one of the
following methods:
CAUTION
The connecting tank or system must be free
of all hazardous or flammable vapors before
inspection procedures begin. Before
disassembling arrester consult Material
Safety Data Sheets (MSDS) for all products
that the arrester was exposed to in service.
The components should be cleaned
according to the MSDS procedure. Take
appropriate safety precautions regarding eye
protection, skin contact & respiration.
•
Compressed air.
•
High pressure steam or water purge.
•
Solvent wash followed by compressed air.
WARNING:
Never try to clean the element by
inserting a sharp tool or probe into the
orifices. Any damage to the integrity of
these passages can render the flame
arrester ineffective.
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6. Inspect the sealing gasket for damage and
replace if necessary.
7. Reassemble the housing, bases and
gaskets. The counterbore will position the
housing on the base. Insert the studs and
torque all fasteners to half the value listed in
Table 2 in a staggered, alternating pattern to
provide an evenly compressed gasket joint.
Lubricate all studs and nuts with an
appropriate thread lubricant. If the arrester
HOUSING STUD TORQUE CHART
SIZE
(mm)
2”
(50mm)
3”
Table 2
Lb.Ft. [Nm]
TORQUE
7678
60[82]
60[82]
will see high temperature service or stainless
steel fasteners are used, select an anti-seize
compound such as moly-disulfide.
8. Make up the final torque and check that no
(75mm)
4”
(100mm)
60[82]
further nut rotation occurs at the specified
torque value. The torque values are based on
original gaskets supplied by Groth
6”
(150mm)
103[143]
Corporation.
8”
103[143]
(200mm)
10”
170[231]
(250mm)
12”
170[231]
(300mm)
Note:
When replacing a temperature sensor, make
sure that the tip of the sensor makes firm
contact with the end of the integrated
thermowell.
The table below is a partial list of vapors for which the MESG has been measured and found to be greater than or equal to
0.036" [0.90 mm]. If your system contains a gas not listed in the table, please consult the factory.
Chemical Compound MESG*
(mm)
acetone 1.02 0.040
acetonitrile 1.50 0.059
ammonia 3.17 0.125
amyl acetate 0.99 0.039
butane 0.98 0.039
butyl acetate 1.02 0.040
butyl alcohol 0.94 0.037
carbon monoxide 0.94 0.037
cyclohexane 0.94 0.037
decane 1.02 0.040
ethane 0.91 0.036
ethyl acetate 0.99 0.039
ethyl nitrite 0.96 0.038
heptane 0.91 0.036
hexane 0.93 0.037
isobutyl alcohol 0.96 0.038
MESG
(Inches)
Chemical Compound MESG*
(mm)
isooctane 1.04 0.041
isopentane 0.98 0.039
isopropyl alcohol 0.99 0.039
methane 1.14 0.045
methyl acetate 0.99 0.039
methyl alcohol 0.92 0.036
methyl ethyl ketone 0.92 0.036
methyl isobutyl ketone 0.98 0.039
octane 0.94 0.037
pentane 0.93 0.037
propane 0.92 0.036
propyl acetate 1.04 0.041
propylene 0.91 0.036
vinyl acetate 0.94 0.037
vinyl chloride 0.99 0.039
*Corrected MESG (mm), 100KpA, 20°C
MESG
(Inches)
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MODEL NUMBER IDENTIFICATION
MODEL#
NOMINAL
SIZE
MATERIAL
OPTIONS
O = No Options
A=ATEX Integrated T/C
Z = Special Option
02”
Thru
12”
7678
NOTES Include model number when ordering.
For special options, consult factory
Flame Element Winding
Body Material
3 = Carbon Steel
5 = 316 SS
Z = Special
O=No Steam Jacket
J=Steam Jacket
W = Weatherhood
EXAMPLE: 7678 - 02 - 35 - WOA
Indicates a 2” Model 7678, Carbon Steel Body, 316 SS Flame Element, Weatherhood Outlet, and ATEX Integrated thermocouple
PRODUCT LIMITED WARRANTY
A. Seller warrants that products which are manufactured by Seller, are
manufactured in accordance with published specifications and free
from defects in materials and/or workmanship for a period of (12)
twelve months. Seller, at its option, will repair or replace any
products returned intact to the factory, transportation charges
prepaid, which Seller, upon inspection, shall determine to be
defective in material and/or workmanship. The foregoing shall
constitute the sole remedy for any breach of Seller's warranty.
B. THERE ARE NO UNDERSTANDINGS, AGREEMENTS,
REPRESENTATIONS, OR WARRANTIES, EXPRESS OR
IMPLIED, (INCLUDING MERCHANTABILITY OR FITNESS FOR
A PARTICULAR PURPOSE REGARDING PRODUCTS ) UNLESS
SPECIFIED IN THE SALES CONTRACT. THIS CONTRACT
STATES THE ENTIRE OBLIGATION OF SELLER.
Seller makes no warranties, either express or implied, except as
provided herein, including without limitation thereof, warranties as
to marketability, merchantability, for a particular purpose or use, or
against infringement of any patent of products. In no event shall
Seller be liable for any direct, incidental or consequential damages of
any nature, or losses or expenses resulting from any defective new
product or the use of any such product, including any damages for
loss of time, inconvenience, or loss of use of any such product.
C. The original Manufacturer shall be solely responsible for the design,
development, supply, production, and performance of its products
hereunder, and the protection of its trade name or names, if any. It
assumes no responsibility, for products modified or changed in any
way by its agent or customer. Any such modifications or changes to
products sold by Seller hereunder shall make the product limited
warranty null and void.
D. The Manufacturer shall be under no obligation to manufacture, sell,
or supply, or to continue to manufacture, sell or supply any of the
Products.
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