ASME Sec VIII Div.1 UCS-79 clarification

[prem nautiyal]

Hi friends   A vessel is being fabricated as per ASME Sec VIII Div.1. MOC is SA 516 Gr.70 The 2:1 ellipsoidal Dish end nominal thickness is 16mm / min thk 14mm. There is no PWHT and Impact test requirements in the vessel. I would like to know whether this 16mm thk dishend requires stress relieving or not as per UCS-79. Vendor has offered dish ends without SR. Is it acceptable? Nothing is mentioned in client specs and drawing about D/E SR.   Regards   Prem Nautiyal

[Raghuram Bathula]

refer UCS 79 (d), in most cases it is not required for cold forming operation.

PWHT is required when the resulting extreme fiber elongation is more than 5% from the as-rolled condition or the reduction by cold forming from the as-rolled thickness is more than 10% at any location where the extreme fiber elongation exceeds 5%.

[sevak hiren]

For P No.1 Gr.No.1 & 2 materials, If the nominal thickness is

above 16 mm & fiber el. is more than 5% – Then only SR is mandatory.

In your case, nominal thickness is 16 mm so fiber el. is allowed up to 40% –

Also, Calculate fiber el. from code formula & check for other conditions

mentioned in UCS-79, then only you will come to conclusion.

On Wed, Sep 5, 2012 at 10:44 PM, prem nautiyal <prem_na...@yahoo.com> wrote:

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[murugesan jeyaraman]

Hi

 

If EFE is less than 5%, SR is not required.

 

EFE  can lies between 5 to 40%, still SR is not required if none of following condition exists. Cold formed dish head  Will need SR even if one of following condition is satisfied when EFE is between 5 to 40%.

 

1) Vessel contains lethal substance

2) Material requires impact testing by either ASME VIII div 1 rules or material specification.

3) Thickness exceeds 16 mm

4) Actual thikness reduction after cold forming exeeds 10%

5) cold forming temperature between 120 to 480 degree C

 

Thanks

 

Murugesan

 

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[mohan nagpal]

Dear Friend,

As per UCS 79 cl. 4 it is cleared mentioned that your fibre elongation is not more than 5% and cl. 3 is not in your cretira because your head thickness is 16mm.

For head fibre elongation is measured as per below 

75t/Rf(1-Rf/Ro)

where t is equal to 16mm in your case

and Rf is your crown and knuckle radius (pl. check in both radius)

and factor  (1-Rf/Ro) is equal to 1 because ro is enfinity.

Also as per EIL specifications all the dished having thickness less than 16mm should be SR and above 16mm should be Normalized.

From: sevak hiren <hirens...@gmail.com>
Sent: Fri, 07 Sep 2012 20:47:57
To: material...@googlegroups.com
Subject: Re: [MW:15233] ASME Sec VIII Div.1 UCS-79 clarification

For P No.1 Gr.No.1 & 2 materials, If the nominal thickness is

above 16 mm & fiber el. is more than 5% – Then only SR is mandatory.

In your case, nominal thickness is 16 mm so fiber el. is allowed up to 40% –

Also, Calculate fiber el. from code formula & check for other conditions

mentioned in UCS-79, then only you will come to conclusion.

On Wed, Sep 5, 2012 at 10:44 PM, prem nautiyal <prem_na...@yahoo.com> wrote:

Hi friends A vessel is being fabricated as per ASME Sec VIII Div.1. MOC is SA 516 Gr.70 The 2:1 ellipsoidal Dish end nominal thickness is 16mm / min thk 14mm. There is no PWHT and Impact test requirements in the vessel. I would like to know whether this 16mm thk dishend requires stress relieving or not as per UCS-79. Vendor has offered dish ends without SR. Is it acceptable? Nothing is mentioned in client specs and drawing about D/E SR. Regards Prem Nautiyal

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[azmir]

Dear All,

I would like to ssek your advice on the following:

As per project specification ,All parts which have been cold formed with an extreme fiber elongation greater than the following shall be subjected to the following heat treatment:  

Carbon and low alloy steels, 5% normalizing and tempering treatment.

 

Currently the purchased plate is a carbon steel with which is already in normalized condition.

 

Our vendor is asking not to perform tempering because as advice from the mill,they cannot guarantee the plate mechanical properties after tempering since the plate supplied in Normalized condition.Vendor will only perform Normalizing Heat Treatment for the plate.

Since i'm not expert,anybody having any experience or knowledge on this can advice me.

Thanks

[Prakash Hegde]

Hi !

If original plate has not undergone Tempering in such  case not to go for tempering but only Normalising

You require to have simulation treatment and subsequent test results for this plate

Regards

Hegde

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[Souravbohray]

We're 16mm thickness is mention in ug79