RE: MILL TOLERANCE

From: <Nashine>
Date: Mon Apr 12 2004 - 02:40:00 EDT

Dear Suresh,

There are two separate issues in respect of thickness. Warning message which appears in analysis in CAESAR is indicative ONLY. There is no need to change the same in respect of requirement of stress analysis. However, to satisfy pressure & temperature design thickness can be changed after carrying out pressure drop calculations .

In respect of second part of your query, please use under-mentioned equation which takes care of mill tolerance, corrosion allowance and threaded pipe.

Required thickness : 8(PD / (2SE+PY) + C1)/7 + C2

Where,

P=design pressure,
D=pipe OD,
S=hot allowable stress
E=joint efficiency factor
Y=factor from design code ; depends on the material and design temperature.

C1= corrosion allowance
C2= depth of cut (applicable in case of threaded piping)

Finally, pipe schedule is selected by rounding off to nearest thickness available in the applicable dimensional standards

Hope this clarify your requirement.

Regards,
Nashine

-----Original Message-----
From: Jagarlamudi.Suresh@ril.com [mailto:Jagarlamudi.Suresh@ril.com] Sent: 09 April 2004 08:21
To: PipingDesign@yahoogroups.com
Subject: [PipingDesign] MILL TOLERANCE

thanks for reply.
If warning message comes means our thickness is not enough for design pressure,but generally all the warning messages are ignoring for analysis,so
after warning message is it necessary to change our pipe thickness? and one more thing is 12.5% of mill tolerance is thickness with corrosion allowance or without corrosion allowance? anyone can explain briefly,

regards
j.suresh
fdc
jamnagar
india

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[Non-text portions of this message have been removed] Received on Mon Apr 12 02:40:00 2004