Fwd: Flange tightening

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Kannayeram Gnanapandithan

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Jul 29, 2022, 3:53:44 AM7/29/22
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Pl ur inputs on the below mail. 

THANKS & BEST REGARDS,
KG.PANDITHAN, BE, IWE,  CSWIP 3.1,
ISO 9712 Level 2 in VT,
ASNT-Level II in PT,MT,RT & UT,
LA ISO 9001-2015,
International Welding Engineer. 
CONSULTANT-WELDING & QUALITY
Mobile no: +919940739349


---------- Forwarded message ---------
From: Ponnikumar <k.pon...@gmail.com>
Date: Thu, Jul 28, 2022 at 5:55 PM
Subject: Flange tightening
To: Kannayeram Gnanapandithan <kgpan...@gmail.com>


Dear sir,
I have a doubt in flange tightening in our project work 6" flange cl900# NRV flange type valve we did hydraulic torquing the gasket bent (bucking) to touch flange inner surface . So client inspector reject due to this I ask what criteria based on reject nothing reply get from him

Please help me to solve this issue any code have or not?

Raghuram Bathula

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Jul 29, 2022, 3:59:56 AM7/29/22
to Materials-Welding
What type of Gasket is and what are the torque values applied? (it should be backed by calculations suitable with the gasket, bolts/flange material, lubrication etc.)
Buckling may cause turbulence in fluid flow, and may leak over time.

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Ponnikumar

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Jul 30, 2022, 9:59:52 AM7/30/22
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Dear sir,
Our gasket spiral wound ss321 inner and outer graphite filler .

Torque range above bolt size 1" and 400 NM they said hydraulic torquing 

Eyup Tan

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Jul 30, 2022, 10:00:40 AM7/30/22
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See below for flange tightening steps.

Saygılarımla, / Best Regards,

Eyup Tan



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Flange bolt tightening sequences.JPG
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