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4. Gaskets and torques
For sealing fiberglass flanges, several gaskets types may be used, depending on the diameter, system pressure or specific
requirements of the client.
IMPORTANT NOTE ON MAXIMUM TORQUE
When assembling fiberglass flanges, bolts should be tightened by hand first, then using a torque wrench up to 30% or the
max torque value shown below and on the following pages. If flanges are not leak tight, torques should be increased up to
60% of the max torque values shown. After all the bolts have been tightened to the recommended torque, recheck the torque
on each soil in the same sequence, since previously tightened bolts may have relaxed. Max torque values shown are
‘Ultimate’ and should be avoided under normal site conditions. Always follow the correct torqueing sequence specified.
Consult FPI for more assistance. Excess torque can prevent sealing and can damage flanges.
a. Asbestos-free CAF type (equivalent to compressed asbestos fibers)
Sized type : full face t = 1/8”
Application : DN 1” through 12”, up to 300 psi rating.
Torques if assembled against flat faced flanges
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