Dear all,
The choice of SCH 100 may be OK. But from the point of
view of easy availability, it is often the practice to
adopt SCH 120.
Please consider this factor.
Regards.
C. V. Gangadharan.
--- Sajit Viswan <sviswan@tebodin.co.om> wrote:
> Parmod, Pankaj, Mani,
>
> Thanks for your responses.
>
> The sizes are 12" 16" 18"
>
> I have checked the material descriptions (MESC). The
> pipe material is ASTM A333 Gr 6 in both the case.
> However It does not mention the manufacturing
> process. That means it is the manufacturers option.
>
> I am not able to conclude. Guessing that sch 100 may
> be adequate for the pressure. There may have been an
> extra allowance in the earlier non-SOUR class which
> might have been economised now.
>
> Sajit
>
> -----Original Message-----
> From: Garg Parmod SPEL-T2
> [mailto:parmod.garg@siemens.com]
> Sent: Monday, June 28, 2004 11:08 AM
> To: 'PipingDesign@yahoogroups.com'
> Subject: RE: [PipingDesign] SOUR Service material -
> Pipe wall thickness
>
>
> Dear Sir,
> The thickness of pipe material depends
> upon pipe diameter, Design pressure, design
> temperature, corrosion allowance joint efficiency
> (seamless or welded)and no. of cycles. Your mail was
> silent about the pipe diameter, design temperature
> and pressure, joint efficiency (no. of cycles are
> generally same for a particular plant). So may be by
> comparing the other parameters you will find the
> reason for the excess thickness required for the
> pipe with non sour service. Moreover the thickness
> can be verified by using thickness calculation
> equation given in ASME B31.3.
>
> Reagrds
> Parmod Garg
>
>
> -----Original Message-----
> From: Mandal Pankaj SPEL-T1
> Sent: 28 June 2004 12:28
> To: 'PipingDesign@yahoogroups.com'
> Subject: [PipingDesign] SOUR Service material - Pipe
> wall thickness
>
>
> Dear Sajit,
>
> I am not sure if variation in wall thickness of
> pipes is really due to sour service.
>
> SOUR services (for example crude pipes in well-head
> platforms) contain sulphur which is highly corrosive
> and induces cracking regardless of pipe wall
> thickness. Please refer to NACE MR0175 / ISO 15156 -
> 2003 for details regarding material selection for
> sour piping.
>
> Wall thickness calculation for sour piping still
> remains the same, based on hoop stress (internal
> pressure).
> --------------------------------
> With best regards,
> Pankaj Mandal
>
>
>
> -----Original Message-----
> From: A.R.Mani [mailto:firreza@yahoo.com]
> Sent: 26 June 2004 18:58
> To: PipingDesign@yahoogroups.com
> Subject: Re: [PipingDesign] SOUR Service material -
> Pipe wall thickness
>
>
> Dear Sajit
>
> One factor which is very important is the seamless
> or welded type pipe.It is possible that the pipe
> used in the sour service is welded but the one in
> non-sour service is seamless.Also some contractors
> select the thickness in accordance with market
> availability of the material irrespective of the
> required calculated thickness and offer their Piping
> Material Specification based on market not design!!!
>
> Cheers
>
> Mani
>
> Sajit Viswan <sviswan@tebodin.co.om> wrote:
> I have 2 - 900# CS Shell piping classes, one for
> SOUR the other non-SOUR is identical in pipe
> material and the corrosion allowance. Material is
> ASTM A 333 Gr 6. CA = 3 mm. The pressure temperture
> ratings are also the same. However the thickness
> differs for the same size, 12". For the non-SOUR
> class it is sch 120 and for the SOUR is sch 100.
> Which is about 4 mm less thick. What is that which
> makes the thickness lesser for the SOUR service
> material. Any guesses?
>
> Sajit
>
>
>
>
> =========================================
> PipingOffice - Excel Spreadsheets for Piping
> Calculations
> http://www.pipingoffice.us/
> =========================================
> Main site: http://www.pipingdesign.com
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
> ---------------------------------
> Do you Yahoo!?
> Yahoo! Mail - 50x more storage than other providers!
>
> [Non-text portions of this message have been
> removed]
>
>
>
>
> =========================================
> PipingOffice - Excel Spreadsheets for Piping
> Calculations
> http://www.pipingoffice.us/
> =========================================
> Main site: http://www.pipingdesign.com
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
> =========================================
> PipingOffice - Excel Spreadsheets for Piping
> Calculations
> http://www.pipingoffice.us/
> =========================================
> Main site: http://www.pipingdesign.com
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
> =========================================
> PipingOffice - Excel Spreadsheets for Piping
> Calculations
> http://www.pipingoffice.us/
> =========================================
> Main site: http://www.pipingdesign.com
>
>
>
>
> Yahoo! Groups Sponsor
>
> ADVERTISEMENT
>
>
<http://us.ard.yahoo.com/SIG=129bvf1j3/M=295196.4901138.6071305.3001176/D=groups\
/S=1705083319:HM/EXP=1088516600/A=2128215/R=0/SIG=10se96mf6/*http://companion.ya\
hoo.com>
> click here
>
>
<http://us.adserver.yahoo.com/l?M=295196.4901138.6071305.3001176/D=groups/S=:HM/\
A=2128215/rand=196837554>
>
>
>
> _____
>
> Yahoo! Groups Links
>
>
> * To visit your group on the web, go to:
> http://groups.yahoo.com/group/PipingDesign/
>
>
> * To unsubscribe from this group, send an email to:
> PipingDesign-unsubscribe@yahoogroups.com
>
<mailto:PipingDesign-unsubscribe@yahoogroups.com?subject=Unsubscribe>
This archive was generated by hypermail 2.1.8 : Mon Oct 27 2008 - 20:24:04 EDT