Groth 7618 User Manual

Installation, Operation and Maintenance

Manual for Flame Arrester

Models 7618, 7628

©2011 Groth Corporation

IOM-7618

Rev. D 12233

Ref. ID: 96056

Page 2 of 16

Table of Contents

I. INTRODUCTION 3

II. INSPECTION AND INSTALLATION 4

1. TABLE 1 – FLAME ARRESTER MAWP 4

2. TABLE 2 – HOUSING AND FLANGE BOLT TORQUE 4

III. MAINTENANCE 6

1. FIGURE 1 – TYPICAL MODEL 7618 FLAME ARRESTER 6

2. TABLE 3 – ELEMENT HOUSING WEIGHT 7

3. TABLE 4 – FLAME ARRESTER ASSEMBLY WEIGHT 7

IV. SPARE PARTS 9

1. TABLE 5 – FLAME BANK ASSEMBLY KIT 10

2. TABLE 6 – GASKET KIT 10

V. MODEL IDENTIFICATION 11

APPENDIX A – MODEL 7618 FLAME ARRESTER (2"-12") 12
APPENDIX B – MODEL 7618 END OF LINE FLAME ARRESTER (2"-12") 13
APPENDIX C – MODEL 7618 FLAME ARRESTER (14" and Larger) 14
APPENDIX D – MODEL 7628 FLAME ARRESTER (2"-12") 15
APPENDIX E – MODEL 7628 FLAME ARRESTER (14"and Larger) 16 15

Page 3 of 16

For information not contained in this manual, please contact:

Groth Corporation

13650 N. Promenade Blvd.

Stafford, TX, 77477 USA

Phone: [phone]

Fax: [phone]

www.grothcorp.com

I. INTRODUCTION

Groth Corporation’s flame arresters are designed to inhibit flame propagation in gas piping systems
and to protect low pressure tanks containing flammable liquids. They protect low flash point liquids
from externally caused sources of heat and ignition, providing increased fire protection and safety.

The flame arresters consist of two main components, the arrester bases and the flame element
housing. The bases serve as the connecting interface to the piping system. The housing
accommodates the flame element and is instrumental in stopping the flame passage. The depth of the
flame element absorbs the heat from the vapor flow, cooling the vapor to prevent auto-ignition on the
protected side.

The flame element is comprised of small parallel triangular 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.

Model 7618 and 7628 flame elements utilize spiral wound, crimped ribbon constructed of corrosion
resistant materials, to insure the best flame quenching performance with minimum pressure drop.

Depending on the design of the system in which it is used, the arrester bases can include optional
ports for temperature or pressure monitoring devices. These devices can activate warning or
shutdown systems if abnormal conditions are detected.

A flame arrester should be treated as a safety device and maintained by a knowledgeable repair
technician. Carefully read and understand this Manual before installing or servicing this product.

The MAWP is different
from the approved pre­ignition pressure.
Consult the factory for
pre-ignition pressure
limits for your
installation.

II. INSPECTION AND INSTALLATION

Size

Model

7618

Alum

Model

7618

CS/SS

Model

7628 Alum

Model

7628

CS/SS

2"

50 (345)

100 (690)

150 (1034)

275 (1965)

3"

50 (345)

100 (690)

140 (965)

275 (1965)

4"

50 (345)

100 (690)

140 (965)

275 (1965)

6"

50 (345)

100 (690)

140 (965)

275 (1965)

8"

50 (345)

100 (690)

90 (620)

200 (1379)

10"

50 (345)

100 (690)

75 (482)

150 (1034)

12"

50 (345)

100 (690)

75 (482)

150 (1034)

Sizes > 12" (7618 & 7628): MAWP = 15 PSIG

Flange*

Housing

Size

Raised

Face
Steel

Raised

Face

Aluminum

Flat

Face

Steel

Flat Face

Aluminum

Model

Steel 7618

Model

Steel 7628

Aluminum

Housing

7618

Aluminum

Housing

7628

2"

60 (82)

35 (47)

60 (82)

50 (68)

60 (82)

40 (54)

50 (68)

35 (47)

3"

60 (82)

35 (47)

60 (82)

50 (68)

60 (82)

40 (54)

50 (68)

35 (47)

4"

60 (82)

35 (47)

60 (82)

50 (68)

60 (82)

40 (54)

50 (68)

35 (47)

6"

105

(143)

60 (81)

105 (143)

90 (122)

105 (143)

105 (143)

90 (122)

90 (122)

8"

105

(143)

60 (81)

105 (143)

90 (122)

105 (143)

105 (143)

90 (122)

90 (122)

10"

140

(190)

100 (136)

170 (231)

140 (190)

170 (231)

220 (300)

140 (190)

170 (231)

12"

140

(190)

100 (136)

170 (231)

140 (190)

170 (231)

220 (300)

140 (190)

170 (231)

All Groth Corporation's flame arresters are bi-directional and the installation on a tank or piping system
depends to a great extent on the design of the system. The Model 7618 is recommended for vertical
installation in closed piping systems or venting to atmosphere. If a Model 7618 is installed in a
horizontal line, it should be equipped with drain ports for removal of condensation from the housing.

WARNING: Do not pipe both drainage connections to a common line as
this can provide a passage for flame to by-pass the flame arrester element.

The Model 7628 is designed for either vertical or horizontal installation.
These series of flame arresters have 150# ANSI PN 10 OR PN 16 flange drilling compatibility, [30" &

36" model 7618 & 7628 have API 650 drilling], and are pneumatically tested to 15 PSIG at the factory.
Follow the guidelines listed in Table 2 for flange make-up torque. The arresters are NOT rated for full
flange pressure and do not require high bolting torque. Recommended torque values are based on
pressures [MAWP] in Table 1. Consult factory for higher pressure applications.
Note:

TABLE 1: FLAME ARRESTER MAWP [PSIG (kPa)]

Page 4 of 16

*Torque values are for reference only and based on a nitrile binder synthetic gasket,
1/16" thick and unlubricated threads.

TABLE 2: BOLT TORQUE [ft-lbs (Nm)]

Page 5 of 16





The following guidelines should be observed at installation:

WARNING: Groth Corporation's flame arresters have been tested by
Factory Mutual Research. To maintain the approval classification, all
arresters must be installed within 10 pipe diameters of the open end of the
vent pipe.

1. Remove any flange protectors and discard all packing material. Inspect flange faces and flame
element for damage or contamination.

2. Inspect the gasket seating surface of the tank nozzle or piping. It must be clean, flat, free of
scratches, corrosion and tool marks.

3. Aluminum flame arresters are furnished with flat face flanges; they should only be installed on
a mating flat face flange with a full face gasket.

WARNING: Installation of an aluminum arrester in piping with raised face
flanges can cause permanent distortion of the base flanges. This may
result in vapor leakage at the flange connection.

Adjacent piping must have appropriate structural support to prevent
excessive loads on the flame arrester flanges.

4. Inspect the gasket; make sure that the material is suitable for the application. Center the
gasket within the bolt circle.

5. Set the arrester between its mating flanges or on the nozzle. Position the lifting handles and
jacking nuts to facilitate future removal of the flame arrester housing (See Maintenance
Instructions section). Install the studs and tighten nuts hand tight.

WARNING: The handles on the arrester housing are to be used for
handling the element only during inspection and maintenance. DO NOT
use the handles to lift the entire flame arrester assembly.

Notes:

When installing Model 7628 in the horizontal position, the

eccentric portion of the housing must be positioned
upward (See Page 14). In this position condensation will
tend to move in the direction of flow and not collect in the
element.

Leave space behind mating pipe flange for insertion of

studs, as there may not be sufficient space to insert studs
from the flame arrester side.

6. Torque all fasteners to half the value listed in Table 2 in a staggered, alternating pattern to
provide an evenly compressed gasket joint.

7. Make up the final torque and check that no further nut rotation occurs at the specified torque
value.