64'' Sch 40 Pipe Thickness & XS Pipe Thickness

[James Abraham]

Dear Members

I have the following doubts to clear in the fabrication of large bore CS  pipe

As per our contract all the large bore pipes are Sch 40 but they provide the material and as per the design all the pipes are Sch  XS

1, What is thickness difference between Sch 40 & XS and how  I can prove this one according to the international standard

2. I have any wright to claim for extra cost because of the thickness difference

Please give your valuable advice

Thank You 

BEST REGARDS

JAMES ABRAHAM|Email - jamesmun...@yahoo.com

[Ricardo Erasmus]

My friend ,Sch 40 =STD (standard wall thickness) and Sch xs = Sch 80(extra strong wall thickness) and Sch xxs= Sch 160 ( extra extra strong wall thickness)

Regards,

Ricardo Erasmus ( Welding Superintendent) Kentz

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[Dindo]

 NPS 10 to NPS 24 Sch XS is not equivalent to S80

[c sridhar]

As per ANSI pipe schedules (wall thickness as per ANSI B 36.19 & B 36,10)

The wall thickness varies for sch. 40, sch 80 and sch XS depending up on  pipe diameters.
for example: Sch 80 & XS will be same  up to 8" dia. and varies from 10" onwards. i.e.,
                     Sch. 80  has same wall thick. compared to XS from 14" onwards.

                     Sch. 40  has same wall thick. from 14" onwards.

Pipe schedules from 2" to 24" for Sch. 40 , XS & 80 is enclosed for your review and hope it 

will help you for your cost calculations.

Sridhar.

[vijay]

Dear sir,

I have the following doubts to clear in the fabrication of CS plate 25thk
1. can i weld buildup in dish end after normalizing?

Please give your valuable advice






Thank You 
BEST REGARDS

vijay kurkutiya

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[manjunath madiwalar]

Dear Vijay,

  According to code definitely No.

Regards

Manjunath  T  Madiwalar

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[prashant barge]

Dear Mr vijay,
Yes we can do it,because purpose of normalising of d-end is relieve the stresses which was occurred during forming.we also carryout nozzles welding and other attachments welding on d-ends after normalising and that is regular practice.

Thanks,

Prashant

[prem nautiyal]

Hi

 

The purpose of normalizing the dished end after forming is to optimize the strength and toughness, give uniform properties by grain refinement and relieving the stresses after forming.

 

In my opinion you cannot do any weld buildup on the D/E after normalizing.

Also if the thickness has gone below the min. required then its a big NO.

 

Refer UG-78 of Div.1 wherein it mentions that method and extent of repair shall be acceptable to inspector.

Hence your client/AI/TPI acceptance is required for the same.

 

Regards

 

Prem Nautiyal

cell: 9769316004

 

Prashant

[cbe swamy]

what Mr. Prashant said is right.....

the purpose of normalizing, to remove the residual stresses after forming. this case very limited, because if we are using higher thickness or Alloys steels we can not apply as above.

Thanks & Best Regards,

 M Veera SAMY

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Date: Thu, 14 Nov 2013 10:07:48 -0800
From: prem_na...@yahoo.com
Subject: Re: [MW:19276] after normalizing dish end weld buildup
To: material...@googlegroups.com

[Dindo]

if you are not allowed to weld on a normalized plate, why is that you are able to weld nozzles on SA516N (Normalized) plates and several attachments????

[Sanjay Yadav]

Yed u can

[israr]

Dear Vijay,

First of all you have to do stress re-leaving not normalizing, if you have done normalizing you have to put a test coupon to re verify mechanical properties. 

Then You can do welding if You are going to do Stress Re leaving of full vessel.

If Dish end normalized  and you are going to weld some nozzle on that stress will develop adjacent to weld that stress to be removed.

[prem nautiyal]

 

Hi

 

As the thickness of Dish end is 25mm as mentioned in trailing email, which is more than 16mm, normalizing has to be done after forming (as per EIL specs).

Regards

 

Prem Nautiyal

 

 

[kannayeram gnanapandithan]

yes,carry out SR after weld build up