PIPING QC CBT QUESTIONS | FLANGE JOINT TIGHTENING METHODS

This article is about Piping QC CBT Questions related to topic of Flange Joint Tightening Methods Activity as per SAEP-351.

PIPING QC CBT QUESTIONS | FLANGE JOINT TIGHTENING METHODS

FLANGE JOINT TIGHTENING METHODS

1. Torque Wrench Method per SAEP-351.
2. o Torque wrench should be calibrated.
   o Apply lubricant to stud thread and face of nut contacting the flange.
   o All stud and nuts installed should be hand tight.
   o All stud should be number.
   o Studs are tighten as number with impact wrench or equivalent following bolt tightening sequence.
3. 1st stage tightening @30% of required torque (maximum)
4. o Required torque value and actual attained value are recorded in Bolt Tightening Report.
   o Final Tightening to ±5% of torque required (actual torque)
   o After tightening all bolts have full thread engagement with the nut.
5. Note: Complete engagement (less 1 full thread) is acceptable (ASME B31.3 par. 335.2.3)
6. Bolt Tensioning Method (HYDRATIGHT) – 50% Tensioning Method

o Pressure gauge in the Tensioning Machine are calibrated.
o Mark bolts in 2 sets, set A and set B.
o Tensioners are fitted to every other bolt of set A.
o Pressurized the tensioner to pre-determined “pressure A” per approved procedure (this is repeated 2 more times).
o Transfer tensioner to set B bolts and pressurized to pre-determined pressure B and tighten nuts (this should be repeated 2 times).

Note: Pressure B is lower in value than pressure A.

o After tensioning, Break Loose Pressure is verified to be greater than or equal to pressure B by the following steps

1. 1. Fit the tensioner to one of the tension bolt in set A.
   2. Pressurized slowly until the nut is loosen using Tommy Bar and socket.
   3. Once the nut moves, stop pressurizing and record the achieved pressure.
   4. This is the “Break Loose Pressure” (Note:If BLP < pressure B, Tensioning is fail)

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Following keywords for this topics are

1. Flange Bolt Tightening Procedure.
2. Bolt Torquing and Tensioning Procedure.
3. Flange Management Procedure.
4. Flange Management Checklist.
5. Bolt Tightening Procedure for Structural Steel.
6. Bolt Tightening Procedure Pdf.
7. Flange Bolt Tightening Sequence Pdf.
8. Criss Cross Tightening Sequence.

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