c) Many manufacturers state that their gaskets may be re-used. Always inspect a gasket for damage, deformation and wear before re-using it. d) Follow the manufacturer’s disassembly procedures. Compact flange designs which include hubs, clamps and pressure energised seal rings such as Grayloc and Seaboard Lloyd Clamplok should be disassembled with care. Such designs can continue to contain residual pressure even with the studbolts removed, due to the wedging action of the clamp halves. Always slacken the compact flange bolting and physically dislodge the clamp halves as a safeguard against any trapped residual pressure. Only then should bolting be fully removed and the flange disassembled.
DonÂ’ts a) Never mix and attempt to match parts of different compact flanges. They may look the same but none are interchangeable. Only use the parts from the specified flange manufacturer.
4.6
Breaking Joints a) Before starting, check that your permit to work is valid for the job in hand, and that the right protective clothing/ equipment is worn. b) Confirm that the line has been drained/vented or isolated as appropriate before attempting to break a joint. c) Ensure that the correct tools for the job are available and are used.
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03000785, May 2000