1
Flame Arrester
Installation, Operation and Maintenance
7658A
Detonation
IOM 7658A.0
May 2015
2
Table of Contents
Section
Page
Introduction
1
Specifications
1
Test Results
1
Design & Function
2
Installation
2
Maintenance
3
Model Identification
5
Product Limited Warranty
5
Tables
Bolt torque
3 & 4
MESG tables
5
Flow capacity table
6&7
Attachments
Certification Test Report
Detonation flame arrester-Bi-directional
Type II-contunuous burn time One hour
Minimum MESG 0.036" [0.92 mm]
Maximum system pressure 15.7 PSIA
Ambient temperature range -13° F to 140° F
Certification reports- 2" through 6" size
Swacer, Inc. test report #97-2
CSA verification-File #LO 4000-5704
INTRODUCTION
This manual is intended to provide recommended
procedures and practices for installation,
operation and maintenance of the Groth Model
7658A detonation flame arrester. Any standard
procedures and practi ces developed for a specifi c
plant or process should supersede this manual.
Although this manual cannot cover all possible
contingencies, following these guidelines will
provide safe, reliable detonation 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. Groth Corporation offers repair services
for all products manufactured by the Tank
Protection Division.
For information not contained in this manual,
please contact:
Groth Corporation
13650 N. Promenade Blvd
Stafford, Texas 77477
281-295-6800
281-295-6995(Fax)
SPECIFICATIONS
Groth detonation flame arresters are constructed
in compliance with the United States Coast
Guard [USCG] specifications for Marine Vapor
Control Systems.
SUMMARY OF TEST RESULTS
The Groth Model 7658A detonation flame
arrester has been subjected to the following test
procedures:
• Detonation testing in compliance with USCG
33 CFR Part 154 Appendix A
• Endurance burn test in compliance with
USCG 33 CFR Part 154 Appendix A
• Corrosion test in compliance with USCG 33
CFR Part 154 Appendix A
• Flow capacity tests.
• Hydrostatic and pneumatic pressure tests.
The above test s were conducted by Swacer, Inc.
and verified by the Canadian Standards
Association. The summary and conclusions of
the reports are attached.
DESIGN AND FUNCTION
Groth's detonation fl am e arrest ers are des igned t o
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 in another
part of the system. The detonati on flam e arrester
must be used under only those operating
conditions for which it was designed and tested.
3
The flame arresters consist of two main
A Type II detonation flame arrester cannot
a continuous flame monitoring system
capable of shutting down the vapor flow
ied on the arrester
nameplate.
A detonation flame arrester may be exposed
Any instrumentation attached to
the arrester must be capable of continued
operation in this environment.
Note
When transporting the detonation arrester,
support it with the flanges in the horizontal
bases if applicable.
components, the arrester bases and the flame
element housing assembly. The bases serve 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 insure the best
flame quenching performance with minimum
pressure drop. The element is supported by rigid
beams, securely welded into the housing to
withstand the extreme pressures of an overdriven
detonation. Each nominal size arrester can be
supplied with various diameter elements to
provide the required flow capacity.
The bases must also withstand the detonation
pressures while conveying the burning vapors
and flame front to the element. 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.
These devices can activate warning or shutdown
systems if abnormal conditions are detected.
Both bases may be equipped with large diamet er
inspection/clean-out ports for in-line
maintenance of the elem ent, or element removal
may be required for inspection/maintenance.
INSTALLATION
Operating Conditions:
Based on the testing conditions, this series of
detonation flame arrester may be installed in
piping systems where:
1. The MESG of the vapor constituent(s) is
greater than or equal to .036" (0.92 mm).
2. System operating pressure is less than or
equal to 15.7 PSIA (1.08 Bar).
3. Normal operating temperature is between 13o F (-25o C) and 140o F (60o C).
4. The piping system in which the detonation
arrester is to be inst alled must not exceed the
arrester flange size.
WARNING
The 7658A detonation flame arrester may NOT
be effective in stopping flame propagation in
systems which contain vapors with an MESG
less than 0.036" [0.92 mm] or when any of the
operating conditions are exceeded.
All Groth Detonation flame arresters are bidirectional and can be used in vertical or
horizontal piping systems.
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.
Note
withstand a continuous flame, and must have
within the time specif
WARNING
to instantaneous pressure spikes in excess of
1000 PSI.
This series of flame arres ters al l have 1 50# ANSI
flanges. Please follow the torque guidelines
listed in Table 1 for flange make-up torque.
position. This position provides the maximum
support for the flame element winding. Lift the
assembly with the [2] lifting eyes attached to the
4
The following guidelines should be observed at
Table 1
Lb.Ft. (Nm)
Size
Torque
2"
70 [95]
3"
70 [95]
4"
70 [95]
6"
110 [150]
8"
110 [150]
installation:
1. Remove any flange pro tectors 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.
PIPE FLANGE STUD TORQUE CHART
4. Lubricate all studs and nuts with an
appropriate thread lubricant. If the arrester
will see high temperat ure service or stainless
steel fasteners are used, select an anti-seize
compound such as moly-disulfide.
5. Center the gasket within the bolt circle.
WARNING
The lifting eyes o n t h e element housin g are
to be used for handling the housing only
during inspection and maintenance. DO
NOT use these eyes to lift the entire
detonation flame arrester assembly.
6. Set the arrester b etween its mating flanges 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.
Notes:
• When installing the Models 7658A in a
horizontal pipeline, use the lowest 1" ports to
drain condensed vapors from the housing.
Note previous warning when connecting the
drain piping.
7. Torque all fasteners to half the value listed in
Table 1 in a staggered, alternat ing pattern to
provide an evenly compressed gasket joint.
• (Torque is an average value b ased on a nitri le
binder synthetic gasket, 1/32" thick and
lubricated threads).
8. Make up the final torque and check that no
further nut rotation occurs at the specified
torque value.
WARNING
After installation, all connections must be
inspected for vapor leakage. This may be
accomplished by static test, gas detector, or
"bubble" test using Snoop or similar liquid.
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 applicatio n. 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.
CAUTION
The connecting pipeline 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
MSDS procedure. Take appropriate safety
precautions regarding eye protection, skin contact
& respiration.
1. When removing the element housing for
maintenance, support the weight by
5
attachment to the housing handles, or lifting
Table 2
Lb.Ft. (Nm)
STUD SIZE
TORQUE
3/4"
70 [95]
7/8"
110 [150]
1"
170 [230]
1 1/8"
240 [330]
eyes, and proceed as follows.
WARNING
The lifting eyes o n t h e element housin g are
to be used for handling the housing only
during inspection and maintenance. DO
NOT use these eyes to lift the entire
detonation flame arrester assembly.
2. Loosen the hex nuts and remove only those
studs or tie rods necessary to withdraw the
housing.
3. On the remaining studs, loosen the holding
nuts and use the spreader nuts to separate th e
base halves from the housing. Use spacer
blocks or spreader tools, if necessary, to
safely secure the base halves so the housing
is free for removal. The Spacers on two studs
will support the housing.
CAUTION
In a horizontal line, the flame bank
assembly should be supported before
removing the studs. Use structures and
equipment suitable for supporting the
components weight. The weight is noted
on the drawing later in this manual.
WARNING:
Never try to clea n the element by ins erting
a sharp tool or probe into the orifices. Any
damage to the integrity of these passages
can render the flame arrester ineffective.
6. Inspect the sealing gasket for damage and
replace if necessary.
7. Reassemble the housing, bases and gaskets.
The support spacers will position the housing
on the base centerline. Insert the studs and
torque all fasteners to half the value listed in
Table 2 in a staggered, alt ernating pattern to
provide an evenly compressed gasket joint.
Lubricate all studs and nuts with an
appropriate thread lubricant. If the arrester
will see high t emperature service or stainl ess
steel fasteners are used, select an anti-seize
compound such as moly-disulfide.
8. Make up the final torque and check that no
further nut rotation occurs at the specified
torque value. The torque values are based on
original gaskets supplied by Groth
Corporation.
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:
• Compressed air.
• High pressure steam or water purge.
• Solvent wash followed by compressed air.
HOUSING STUD TORQUE CHART
6
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
(mm)
(Inches)
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
(mm)
(Inches)
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
Z = Special
Z = Special Flanges
NOTES
Include model number when ordering.
For special options, c onsult factory
EXAMPLE: 7658A - 02 - 05 - 35 - FO
0.036" [0.92 mm]. If your system contains a gas not listed in the table, please consult the factory.
Chemical Compound MESG*
MESG
Chemical Compound MESG*
MESG
acetone 1.02 0.040
MODEL NUMBER IDENTIFICATION
MODEL#
NOMINAL
SIZE
ELEMENT
SIZE
MATERIAL
isooctane 1.04 0.041
*Corrected MESG (mm), 100KpA, 20°C
OPTIONS
7658A
Indicates a 2" Model 7658A with 5" Element Size, Carbon Steel Body, 316 SS Flame Winding, 150# Flanged Outlet, and no options
02"
Thru
6"
05"
Thru
12"
Flame Element Winding
Body Material
3 = Carbon Steel
5 = 316 SS
O = No Options
Z = Special
F = 150# A.N.S.I.
Flange
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 materia ls 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 r emedy for any breach of Seller's wa r ranty.
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 nat ure, or losses or expenses resultin g from any defecti ve 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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