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INSTRUCTION MANUAL

Installation, Operation and Maintenance

GROTH FLAME ARRESTERS

MODELS 7618 / 7628 / 7638 / 7648

IOM 7618.0May 94

Groth Corporation 1994

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TABLE OF CONTENTS:Description Page

Introduction 1

Inspection & Installation 1

Maintenance 3

Replacement Parts 5

Bills of Material & Drawings

Model 7618 6

Model 7628 7

Model 7648 8

Model 7618 with Steam Jacket 9

Model 7618 with Weatherhood 10

Figures

Fig. 1 - Typical Flame Arrester 3Tables

Table 1 - Flame Arrester MAWP 2

Table 2 - Flange Bolt Torque 2

Table 3 - Housing Bolt Torque 5

Table 4 - Element Housing Weight 5

Table 5 - Flame Arrester Weight 5

Table 6 - Replacement Gaskets 5

INTRODUCTIONGroth'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 causedsources 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 pipingsystem. The housing accommodates the flame

element and is instrumental in stopping the flame passage.

The flame element is comprised of small paralleltriangular passageways aligned so that anapproaching flame front is slowed down and thenquenched before it can propagate to the protectedside 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.

Depending on the design of the system in which it isused, the arrester bases can include optional ports fortemperature or pressure monitoring devices. Thesedevices can activate warning or shutdown systems if

abnormal conditions are detected.A flame arrester should be treated as a safetydevice and maintained by a knowledgeable repairtechnician. Carefully read and understand thisManual before installing or servicing this

product. Groth Corporation offers repair servicesfor all products manufactured by the TankProtection Division.

For information not contained in this manual, pleasecontact:

Groth Corporation13650 N. Promenade Blvd.Stafford, Texas 77477, USA281-295-6800 (Office)281-295-6999 (Fax)

INSPECTION & INSTALLATION

All Groth's flame arresters are bi-directional and theinstallation on a tank or piping system depends to agreat extent on the design of the system. The Model

7618 is recommended for vertical installation inclosed piping systems or venting to atmosphere. If aModel 7618 is installed in a horizontal line, it should

be equipped with drain ports for removal ofcondensation from the housing.

WARNING

Do not pipe both drainage connections to acommon line as this can provide a passage forflame to by-pass the flame arrester element.

The Models 7628/7648 are designed for eithervertical or horizontal installation.

These series of flame arresters have 150# ANSIflange drilling compatibility, [30 & 36 model 7618& 7628 have API 650 drilling], and are

pneumatically tested to 15 PSIG at the factory.Please follow the guidelines listed in Table 2 forflange make-up torque. The arresters are NOT ratedfor full flange pressure and do not require high

bolting torque. Recommended torque values are

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based on pressures [MAWP] in Table 1. Consultfactory for higher pressure applications.

The following guidelines should be observed atinstallation:

WARNING

Groth Corporation's flame arresters havebeen tested by Factory Mutual Research. Tomaintain the approval classification, allarresters must be installed within 10 pipediameters of the open end of the vent pipe orthe potential ignition source.

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

2. Inspect the gasket seating surface of the tank

nozzle or piping. It must be clean, flat, free ofscratches, corrosion and tool marks.

3. Aluminum flame arresters are furnished withflat face flanges; they should only be installedon a mating flat face flange with a full facegasket.

WARNING

Installation of an aluminum arrester in pipingwith raised face flanges can cause permanentdistortion of the base flanges. This may resultin vapor leakage at the flange connection.

Adjacent piping must have appropriatestructural support to prevent excessive loadson the flame arrester flanges.

4. Lubricate all studs and nuts with an appropriatethread lubricant. If the arrester will see hightemperature service or if stainless steelfasteners are used, select an anti-seizecompound such as moly-disulfide.

5. Inspect the gasket; make sure that the materialis suitable for the application. Center the gasketwithin the bolt circle.

6. Set the arrester between its mating flanges oron the nozzle. Position the lifting handles and

jacking nuts to facilitate future removal of theflame arrester housing (See MaintenanceInstructions). Install the studs and tighten nutshand tight.

WARNING

The handles on the arrester housing are to beused for handling the element only duringinspection and maintenance. DO NOT use thehandles to lift the entire flame arresterassembly .

Table 1: Flame Arrester MAWPPSIG (kPa)

Size Model7618Alum

Model7618

CS/SS

Model7628Alum

Model7628

CS/SS

2 50 100 150 2853 50 100 140 2854 50 100 140 2856 50 100 140 285

8 50 100 90 20010 50 100 75 15012 50 100 75 150All Model 7618A & 7628A: MAWP = 15 PSIG

All Model 7648: MAWP = 285 PSIG

Table 2: Flange Bolt Torque (*)Lb. Ft. (Nm)

Size RaisedFace

FlatFace

Size RaisedFace

2 60 (82) 60 (82) 14 240 (326)3 60 (82) 60 (82) 16 240 (326)4 60 (82) 60 (82) 18 340 (462)6 105 (143) 105 (143) 20 340 (462)8 105 (143) 105 (143) 24 460 (626)

10 140 (190) 170 (231) 30 105 (143)12 140 (190) 170 (231) 36 105 (143)

* Torque values are for reference only and basedon a nitrile binder synthetic gasket, 1/16" thick

and unlubricated threadsNotes:

When installing Model 7628 in the horizontal position, the eccentric portion of the housingmust be positioned upward (See Page 8). In this

position condensation will tend to move in thedirection of flow and not collect in the element.

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Leave space behind mating pipe flange forinsertion of studs, as there may not besufficient space to insert studs from the flamearrester side. (Models 7618 & 7628).

8. Torque all fasteners to half the value listed inTable 1 in a staggered, alternating pattern to

provide an evenly compressed gasket joint.

9. Make up the final torque and check that nofurther nut rotation occurs at the specifiedtorque value.

WARNING: After installation, all connectionsmust be inspected for vapor leakage. This may

be accomplished by static pressure test, gasdetector, or "bubble" test using a liquid leakdetector.

Fig. 1- Typical Model 7618 Flame Arrester

MAINTENANCE

For maximum operating efficiency the element of aflame arrester must be inspected for clogging at

regular intervals. Frequency of inspection andmaintenance should be based on the experiencegained in each application. For ease of service, theflame element housing can be easily removed forinspection and maintenance without removing thearrester from the line. It is recommended that thearrester be removed for inspection of the elementat least once per year or any time that one of thefollowing conditions occurs:

Excessive pressure drop is encountered at aknown flow rate.

A flame front is detected.

Flame arresters equipped with a steam jacketor Model 7648 can not be serviced in-line. Thearrester must be removed from the pipeline ortank nozzle for inspection and maintenance.

1. Purge the line or tank with an inert gas beforeattempting to remove the arrester formaintenance.

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CAUTION

The connecting pipeline must be free of allhazardous or flammable vapors before inspection

procedures begin. Before disassembling arresterconsult Material Safety Data Sheets (MSDS) forall products that the arrester was exposed to inservice. The components should be cleaned

according to MSDS procedures. Takeappropriate safety precautions regarding eye protection, skin contact & respiration.

2. Refer to Fig. 1 which illustrates a typical flamearrester with the element removed.

3. Loosen the housing nuts and remove only thosestuds or tie rods necessary to withdraw thehousing. Do not remove studs, which havespreader nuts.

WARNING The handles on the arrester housing are to beused for handling the element only duringinspection and maintenance. DO NOT use thehandles to lift the entire flame arresterassembly .

4. If the flame arrester is in a horizontal line,attach whatever lifting equipment is required toremove the element [see weight table 4].

CAUTIONIf not supported, the element housing will droponto the remaining studs when the bases areseparated. Be careful to avoid contact with thehousing while separating the bases.

5. On the remaining studs, loosen the housing nutsincrementally while advancing the spreadernuts to separate the bases. When the bases areseparated sufficiently to remove the housing,tighten the housing nuts so the bases form a

rigid assembly when the housing is removed.6. If a vertically mounted flame arrester is used to

support a pressure/vacuum relief valve orsimilar equipment, tightening the housing nutsafter separating the bases will providesufficient support for the PVRV valve.

7. Remove the housing assembly for inspection.Visually inspect the flame element and

supporting grids for damage or corrosion build-up from both sides. If the flame elementappears to be damaged, it should be replacedimmediately.

WARNING

Failure to replace a damaged flame elementcan render the flame arrester ineffective.

8. Verify that the element openings are notclogged by viewing a light source through theelement passages. If the flame element is dirtyor clogged it can be cleaned by one of thefollowing methods:

Compressed air. High pressure steam or water purge. Solvent wash followed by compressed air.

WARNING

Never try to clean the element by inserting asharp tool or probe into the orifices. Anydamage to the integrity of these passages canrender the flame arrester ineffective.

CAUTION

If compressed air, steam or high pressurewater jet is used to clean clogged elementpassageways, restrict access to the area toprevent injury from blown debris exiting theelement. Use appropriate personnel safetyequipment for the cleaning method used.

9. Inspect the sealing gasket for damage andreplace if necessary. (See Table 6 forreplacement gasket part numbers.

Note that 30 arresters (and larger) useadhesive backed Teflon tape sealant instead of agasket.

10. Install a gasket in the counter bore of each

base. Position the element housing to align withthe counterbores. Insert the studs and torque allfasteners to half the value listed in Table 3 in astaggered, alternating pattern to provide anevenly compressed gasket joint.

If the arrester is in high temperature service orstainless steel external fasteners are used, applyan anti-seize compound such as moly-disulfideto all threaded components.

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11. Make up the final torque and check that nofurther nut rotation occurs at the specified torque value. The torque values are based onoriginal gaskets supplied by Groth Corporationand unlubricated studs.

Table 3: Housing Bolt Torque Chart (*)

Ft. Lb. (Nm)

Size Model 7618 Model 76282 60 (82) 40 (54)3 60 (82) 40 (54)4 60 (82) 40 (54)6 105 (143) 105 (143)8 105 (143) 105 (143)

10 170 (231) 220 (300)12 170 (231) 220 (300)14 40 (54) 40 (54)16 40 (54) 40 (54)

18 40 (54) 40 (54)20 40 (54) 40 (54)24 40 (54) 40 (54)30 40 (54) 40 (54)36 60 (82) 60 (82)

* Torque values are for reference only and basedon a nitrile binder synthetic gasket, 1/16" thickand unlubricated threads

Table 4: Element Housing Weight - [Lb. (kg)]

Models 7618 / 7628Size Aluminum Alum/SS (+) Steel

2" 5 (2) 10 (5) 15 (7)3" 10 (5) 10 (5) 20 (9)4" 15 (7) 20 (9) 35 (16)6" 30 (14) 45 (20) 75 (34)8" 45 (20) 70 (32) 115 (52)

10" 70 (32) 110 (50) 175 (80)12" 95 (43) 160 (73) 250 (114)14 575 (261)16 745 (339)18 Consult 890 (405)20 1135 (516)24 Factory 1805 (820)30 3095(1407)36 4315(1961)

(+) = Aluminum construction with SS flame element.

Table 5: Flame Arrester Assembly Weight - [Lb.(kg)]

Models 7618

Size Aluminum Alum/SS (+) Steel2" 15 (7) 20 (9) 45 (70)3" 25 (11) 30 (14) 75 (34)4" 40 (18) 45 (20) 105 (48)6" 80 (36) 100 (45) 225 (102)8" 130 (59) 155 (70) 360 (164)

10" 200 (91) 245 (111) 555 (252)12" 285 (130) 345 (157) 795 (361)14 1110 (505)16 1535 (698)18 Consult 1765 (802)20 2240(1018)24 Factory 3360(1527)30 5730(2605)36 9240(4200)

Models 7628

Size Aluminum Alum/SS (+) Steel2" 25 (11) 30 (14) 70 (32)3" 35 (16) 40 (18) 95 (43)4" 50 (23) 60 (27) 105 (48)6" 85 (39) 100 (45) 225 (102)8" 150 (68) 175 (80) 360 (164)

10" 235 (107) 280 (127) 555 (252)12" 320 (125) 385 (175) 795 (361)14 1110 (505)16 1535 (698)18 Consult 1765 (802)20 2240(1018)24 Factory 3360(1527)30 5730(2605)36 9240(4200)

To order original Groth general purpose replacementgaskets (#), select the corresponding Part Number forthe arrester size from the table below:

Table 6: Gasket Part NumberSize Part No. Size Part No.

2 80018020 14 800181233 80018030 16 800181264 80018040 18 800181276 80018060 20 800181358 80018080 24 80018136

10 80018100 30 Teadit 24B12 80018120 36 Teadit 24B(#) = Synthetic Non-Asbestos Fiber sheet material with a

nitrile binder. For special applications or chemicalcompatibility please contact factory.

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Groth Model 7618 Flame Arrester with Steam Jacket

Groth Model 7618 Flame Arrester

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Groth Model 7628 Flame Arrester

ITEM DESCRIPTION CARBON ALUMINUM STAINLESS1 Base CS Aluminum 316 SS2 Handle CS Aluminum 316 SS3 Hex Nut 304 SS 304 SS 304 SS4 Stud 304 SS 304 SS 304 SS5 Plug SS SS 316 SS

6 Rod SS SS 316 SS7 Grid SS Aluminum 316 SS8 Housing CS Aluminum 316 SS9 Coupling (optional) CS Aluminum 316 SS

10 Plug (optional) CS Aluminum 316SS11 Gasket (*) Non-Asbestos Compressed Fiber12 Flame Element SS Aluminum 316 SS

(*)= Spare parts (See Table 6).

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Groth Model 7618A Flame Arrester

Groth Model 7628A Flame Arrester

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Groth Model 7648 Flame Arrester

ITEM DESCRIPTION CARBON ALUMINUM STAINLESS1 Base CS Aluminum 316 SS2 Grid SS Aluminum 316 SS3 Flame Element SS Aluminum 316SS4 Plug SS SS 316 SS5 Rod SS SS 316 SS

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Groth Model 7618 Flame Arrester w/ Weatherhood

ITEM DESCRIPTION CARBON ALUMINUM STAINLESS1 Base CS Aluminum 316 SS

2 Handle CS Aluminum 316 SS3 Hex Nut 304 SS 304 SS 316 SS4 Stud 304 SS 304 SS 316 SS5 Plug SS SS 316 SS6 Rod SS SS 316 SS7 Grid SS Aluminum 316 SS8 Housing CS Aluminum 316 SS9 Coupling (optional) CS Aluminum 316 SS

10 Plug (optional) CS Aluminum 316SS11 Gasket (*) Non-Asbestos Compressed Fiber12 Flame Element SS Aluminum 316 SS13 Weatherhood Post 304 SS 304 SS 316 SS14 Eye Nut CS CS SS15 Hex Nut 304 SS 304 SS 316 SS16 Weatherhood CS Aluminum 316 SS17 Screen SS PVC SS18 Adapter Plate Aluminum CS SS

(*)= Spare parts (See Table 6).

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The nameplate on the flame arrester contains the Model Number, Serial Number and additionalinformation about materials of construction and options. The following chart will assist in relating theModel Number to the characteristics of your equipment:

MODEL SIZE MATERIAL OPTIONS------ ------ -------------

7618 02 1=Aluminum Element O = No Specials

7628 03 5=316 SS Element Z = Special Options7648 04 Z=Special Element

06 O = No Jacket08 1=Aluminum Body J = Steam Jacket10 3=Carbon Steel Body12 5=316 SS Body F = Flanged Outlet14 Z=Special Body W = Weatherhood161820

243036

EXAMPLE: 7618-02-35-FOO indicates a 2" Model 7618 with Carbon Steel body, 316SS flame elementwinding and no special options.

PRODUCT LIMITED WARRANTY

A. Seller warrants that products which aremanufactured by Seller, are manufactured in

accordance with published specifications and freefrom defects in materials and/or workmanship fora period of (12) twelve months. Seller, at itsoption, will repair or replace any products returnedintact to the factory, transportation charges

prepaid, which Seller, upon inspection, shalldetermine to be defective in material and/orworkmanship. The foregoing shall constitute thesole remedy for any breach of Seller's warranty.

B. THERE ARE NO UNDERSTANDINGS,AGREEMENTS, REPRESENTATIONS, ORWARRANTIES, EXPRESS OR IMPLIED,(INCLUDING MERCHANTABILITY ORFITNESS FOR A PARTICULAR PURPOSEREGARDING PRODUCTS) UNLESSSPECIFIED IN THE SALES CONTRACT. THISCONTRACT STATES THE ENTIREOBLIGATION OF SELLER.Seller makes no warranties, either express orimplied, except as provided herein, includingwithout 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 beliable for any direct, incidental or consequentialdamages of any nature, or losses or expensesresulting from any defective new product or theuse of any such product, including any damagesfor loss of time, inconvenience, or loss of use ofany such product.

C. The original Manufacturer shall be solelyresponsible for the design, development, supply,

production, and performance of its productshereunder, and the protection of its trade name ornames, if any. It assumes no responsibility, for

products modified or changed in any way by itsagent or customer. Any such modifications orchanges to products sold by Seller hereunder shallmake the product limited warranty null and void.

D. The Manufacturer shall be under no obligation tomanufacture, sell, or supply, or to continue tomanufacture, sell or supply any of the Products.