Flanged Conections Procedure

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FLANGED CONNECTIONS PROCEEDURE.R e v i s i o n :

01

D a t e :

10-05-10R e s p o n s i b l e :

C.S.G.

A r e a :

TECHNICAL

A p r o v e d b y :

MANAGEMENT

P a g e :

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C a l l e 1 0 0 b s u r N 5 1 1 0 T e l f o n o s : ( + 5 7 4 ) 2 7 8 1 7 9 0 ( + 5 7 4 ) 2 7 8 3 9 4 0

W e b S i t e : w w w . f i b r a t o r e s a . c o m F a x : ( + 5 7 4 ) 2 7 8 1 4 3 8

0 Table of Contents0 Table of Contents 1 1 Flanged Connections 1 2 FRP Flange to FRP Flange 1 3 FRP Flange to Flat Face Metall ic Flanges and Lug-T ype In-Line Valves 1 4 FRP Flange to Raised Face Metall ic Flanges 2 5 FRP Flange to Wafer Type In-Line Valves 2 6 Recommended Torqueing Values 3 7 Bolting Sequences 3 1 Flanged Connect ionsFRP flanges are susceptible to damage from over torqueing. The torque valuesin the tables section of this document are recommended values. In some cases

the torque level may exceed this value fo r complete seating and sealing.

2 FRP Flange to FRP FlangeFor FRP flange to FRP flange bolt ing, follow the recommended torque sequencesin this document. Note that different recommended torque values are provided

for f langes uti l izing full face gaskets and o-ring gaskets. Follow therecommended torque levels and torqueing sequences in this document.

3 FRP Flange to Flat Face Metal lic Flanges and Lug-Type In-Line ValvesWhen bolt ing an FRP flange to a metall ic f lat-faced flange or to a metall ic orother plastic full face, f lat face valve, follow the recommended torque sequences

in this document.


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01

D a t e :

10-05-10R e s p o n s i b l e :

C.S.G.

A r e a :

TECHNICAL

A p r o v e d b y :

MANAGEMENT

P a g e :

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4 FRP Flange to Raised Face Metall ic FlangesWhen possible, the bolt ing of f lat-faced FRP flanges directly to raised faceflanges should be avoided. However, FRP flanges can be properly torqued to

raised-face f langes. The raised-face surface of a metall ic f lange actuallyprovides a very good sealing surface; however, care must be taken to ensure that

the FRP flange is not over torqued because damage could result to the FRPflange.

In the case where FRP flanges are being bolted to raised-face f langes, a f i l lerring made of a material such as teflon can be used (but is not required) as ashim around the raised-face f lange to provide a f lat surface. The sole purpose

of this f i l ler r ing is to prevent damage to the FRP flange from over torqueing.

Some applications using fi l ler r ings have shown the f i l ler r ing to provide l i t t leimprovement in protecting the f lange from damage from over torqueing. The

main reason for this is believed to be due to t he very t ight tolerances required ofthe f i l ler r ing in order to ensure a full , f lat surface. This is mainly true on

0.06in. raised face f langes.

Refer to this document for bolt ing torques and sequences to raised-face metall icflanges.

5 FRP Flange to Wafer Type In-Line ValvesConnections to wafer type valves are similar to connections to raised-face

flanges. The wafer type valve does not provide the full f lat surface of a f lat-faced valve. However, just as is the case with raised- face f langes, FRP flanges

can be properly torqued to wafer type valves. The wafer type valve is usuallyeasier to install than a full-face valve and the surface of this valve also provides

a very good sealing surface. However, care must be taken to ensure that theFRP flange is not over torqued because damage could result to t he FRP flange.

Refer to the tables in this document bolt ing to wafer type valves.

Special installat ion steps may be required when the f langes in the piping system

may be exposed to a potential fire hazard. In these cases, the f langedconnection may have to be passively f ire protected.


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01

D a t e :

10-05-10R e s p o n s i b l e :

C.S.G.

A r e a :

TECHNICAL

A p r o v e d b y :

MANAGEMENT

P a g e :

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6 Recommended Torqueing ValuesFlange Size Pressure

Rating (psi)

Seal Type Torque (ft

lbs) nonlubricated

Torque (ft

lbs)lubricated

1

1 75 Ring Gasket 10 10



4 75 Ring Gasket 50 356 75 Ring Gasket 50 35







7 Bolt ing Sequences

1Using a thread lubr icant .

Flanged Conections Procedure

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