From: Janak Patel [mailto:janakpatel@patelsairtemp.com]
Sent: Saturday, July 07, 2012 10:19 AM
To:
Cc
Subject: Advice requried for one Technical matter - Janak Patel
I
Dear Sir
Good Morning.
In one of the order for refinery equipments (H.E.), we had a technical issue on which I need your help / advice.
Question is related to Girth Flanges of Shell / Shell Cover / Channel.
1) Whether G.F. made of SA-266 requires Tension Test? Is it mandatory or supplementary?
2) If we have to do tension test (if applicable), then what is the location of the tension test piece?
3) Can G.F. be made by machining? Can we take ring forging (with OD x ID x total thk. including hub length) and then machine to get hub & other dimensions?
4) Is it allowed as per CODE? If yes, is it good engineering practice?
Small background on the matter :
Client has written in their document "Tension test required as per UW-13 (f) for SA-266-2N G.F." I had replied that it is applicable for Tubesheets & Flat End Covers & not G.F.s. Then client had said that it is required as per "Section II Part A SA 266, Cl. No. 3.4 and SA 788, Cl. No. S12". Also they had asked us to procure Ring forging and then machine it to make hub. They had also given sketch of it and shown tension test piece location (attached herewith for immediate reference). They had said that option b) in the sketch is preferred.
As per our understanding, Tension test is not required for SA-266 G.F.s. Also making a G.F. from a ring forging (by machining) is not a good engineering practice as it cuts the grain flow lines and makes it vulnerable to stress concentration / failures. I had also given literature on this to client (attached herewith for immediate reference).
Request to spare 5-10 minutes and give your valuable advice on the issue.
Many thanks in advance for your valuable advice.
Regards,
Janak Patel
Manager – Projects & Business Development
___________________________________________
PATELS AIRTEMP (INDIA) LIMITED
ASME "U", "U2", "R", "S", "NB" AUTHORIZED COMPANY
HTRI MEMBER (HEAT TRANSFER RESEARCH, INC. USA)
ISO 9001:2008 CERTIFIED
805,806,807 & 810, RAKANPUR - 382 721,
VIA : SOLA - BHADAJ VILLAGE,
TAL. : KALOL, DIST. : GANDHINAGAR,
GUJARAT, INDIA.
TEL : 91-02764-286634/35, 286480/81
FAX : 91-02764-286301
E-mail : janakpatel@patelsairtemp.com
Mob : +91-9904406059
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