Query related to Pressure testing of Existing piping/equipment - Looking for a right recommendation based on International Standard/ Guidelines

[ViNo Varughese]

Dear All,

I have read recently an Oil & Gas Journal regarding the hydro test Vs holding time and looking for more insight from Experts from different industries.  There are few questions which I would like to get more clarity on - 

1. What should be the recommendation for pressure testing of existing piping line which is repaired due to leak? Whether we should follow the Construction code or should we limit just above the MAOP? Is there any criticality rating based on which we need to consider the pressure test value, eg: H2S service.

2. Many times our Operation colleague request to consider the closure weld principal where we can do additional NDT on the welded joints instead of pressure testing. I do understand that NDT cannot be replaced with pressure testing. However, there are good chance of having a defect opened up which is on the verge of failure when the line is tested at 1.5/1.3 times the design pressure. How to deal with such situations when Asset Plant has been in Operation since 25+ years? 

3. There is reference in the same Oil & Gas Journal - " A study of the causes of failures of Defects that Have Survived a Prior Hydrostatic Test". Appreciate if someone holds a copy of this article and please share in forum.

4. I think there is no International code referring to holding time of pressure testing. Just would like to get a reconfirmation on this. 

Hope to see view from Experts all around different industries. I am sure it's a very routine repair in almost all of the Plants/Company and will add value to each one of us.

Best Regards

Vino  

[Johnson Madukayil]

Check ASME B31.1-137.4.5 and 137.5.5 as an example. The holding time is a minimum of 10 minutes.

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[pradip kumar Sil]

Min 10 mins as per code

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[PGoswami]

Hi Vino,

I believe your query is on repair/alteration and rerating of an existing piping? If so follow the guidelines of API-570 as attached. Additionally follow the flow chart of ASME PCC-2 and the recommendations of article 5.1 of PCC-2 for more guidance. One should not repair/ alter and operate a 25+ year plant  same as a new construction.

 

Following repair, one may perform pressure test at the MAWP, or rerate the piping or component and accordingly proceed for testing.

 

I would thing attached API 570 guidelines and guidelines of PCC-2 codes would be of help.

 

Thanks.

 

 

P.Goswami.P.Eng, IWE.

Independent Welding & Metallurgical Specialist

Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/

Email:pgos...@quickclic.net,pradip....@gmail.com

Cell/Whasapp:1-905-9793232

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[ibrahi...@gmail.com]

The PCC-2 charts list a value for stored energy. How to calculate that manually without software? I assume a simple methodology for inspectors or inspection engineers would be available.

[Vinay Thattey]

Minimum hold time is 10 min. You can test at 1.1 of design pressure.

On Sat 27 Apr, 2019, 19:10 pradip kumar Sil, <prad...@gmail.com> wrote:

Min 10 mins as per code

On 27 Apr 2019 5:51 pm, "Johnson Madukayil" <jmadu...@gmail.com> wrote:

Check ASME B31.1-137.4.5 and 137.5.5 as an example. The holding time is a minimum of 10 minutes.

On Sat, Apr 27, 2019 at 6:22 AM ViNo Varughese <vinopv...@gmail.com> wrote:

Dear All,

I have read recently an Oil & Gas Journal regarding the hydro test Vs holding time and looking for more insight from Experts from different industries.  There are few questions which I would like to get more clarity on - 

1. What should be the recommendation for pressure testing of existing piping line which is repaired due to leak? Whether we should follow the Construction code or should we limit just above the MAOP? Is there any criticality rating based on which we need to consider the pressure test value, eg: H2S service.

2. Many times our Operation colleague request to consider the closure weld principal where we can do additional NDT on the welded joints instead of pressure testing. I do understand that NDT cannot be replaced with pressure testing. However, there are good chance of having a defect opened up which is on the verge of failure when the line is tested at 1.5/1.3 times the design pressure. How to deal with such situations when Asset Plant has been in Operation since 25+ years? 

3. There is reference in the same Oil & Gas Journal - " A study of the causes of failures of Defects that Have Survived a Prior Hydrostatic Test". Appreciate if someone holds a copy of this article and please share in forum.

4. I think there is no International code referring to holding time of pressure testing. Just would like to get a reconfirmation on this. 

Hope to see view from Experts all around different industries. I am sure it's a very routine repair in almost all of the Plants/Company and will add value to each one of us.

Best Regards

Vino  

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[ViNo Varughese]

Dear All,

Thank you for your response. However, I was looking for information from current practices adopted in your companies which will be a  realistic scenario. Whether you have created a documented procedure of same? 

Thanks and Regards

Vino

[George Dilintas]

NBIC part 3 also, gives requirements regarding repairs and Alterations

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Dr. Georgios Dilintas,

Dipl. Ing. In Aeronautic and Space Engineering

Ph.D in Mechanics of Solids - Computational Mechanics

A.I.S, A.N.I, IRCA Lead Auditor

Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis

[ViNo Varughese]

Dear George, Pradeep and all,

Thank you for the response, appreciated. Can you please provide more information from current practices adopted in your companies towards such cases. We are planning to adopt this in our revised Procedure. If you can share your procedure, if possible, or just the "right technical" sentence to fit into our Procedure, it would be great support.

Thanks and Regards,

Vino 

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