Pipeline hydro test sectioning.

[이용준]

Does any specific requirement for hydro test sectioning method?

If pipeline is going more than 100 KM how do we handle the hydro test?

I suppose it is not possible to test one time due to the cost and time.

My question is as below;

1. The permanent flanges are required for sectioning for test? Or normally it is done by temporary flange?

2. If we need permanent flanges for test, how can I choose the location of flange?

[Hareesh K V]

Dear Sir, 

This situation can be handled by using one weld as "golden joint".Golden joint is that joint of which hydrotesting will not/cannot be done. The concept of in process inspection is applied in this joint.

Hydrotesting of the pipe line is done in convenient sections and the connecting joints ( Which will be welded after hydrotest) are treated as "Golden Joint".

In many cases Permanent flanges are not allowed in such long length Piping because of the chances of leak in future due to gasket failure.

Regards,

Hareesh K V 

+91-8547859202 

Sent from my Samsung Galaxy smartphone.

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[Lakshman Kumar. B]

Hi,

 

For pipe line HT (Hydro test) section might be as small as to 1 joint, and maximum length shall be govern by respective codes & standard.

Further Pipe line section will be depend on so many parameters … few of the key points to be noted while finalizing the section length of the pipe line are

 

1.       Maximum and minimum elevation levels in the pipe line..(will Impact pressure difference)

2.       Design pressure, test pressure, working pressure’s

3.       Pipe line design - factor of safety.

4.       Application of line (water, oil, gas, crude and etc)

5.       % of SMYS considered for design.

6.       Temperature variations.

7.       Crossings covered in the section

8.       Code / standard following..

9.       Testing medium…

10.   Duration of test.

11.   Pipe line status – buried, or open, or covered etc…

12.   Provision of water sources and draining.

13.   Type of joint inspection (ex if 100% RT was done, we will go for longer sections, if no NDT is offered in joints – better to limit for small sections, as if any defects identified, dewatering the entire section will be difficult)

 

Permanent or temporary flanges and all are not the criteria – in general it will be planned for a HT header, which include water filling facility, pressurization ports, measurement ports and etc…

Header will be either flanged or welded type, and flanges are also like that either a permanent or a temporary – there is no limitation.

But due care has to be taken, that after HT – no more welding’s are advisable.

 

And location of the flange will be as per your section…

 

Thanks & Regards,

Lakshman Kumar B,

Project Manager.

 

Mob - +91 9440031459.

Email –lakshma...@gmail.com

 

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of ???
Sent: Monday, August 01, 2016 11:22 AM
To: Materials & Welding <material...@googlegroups.com>
Subject: [MW:25179] Pipeline hydro test sectioning.

 

 

Does any specific requirement for hydro test sectioning method?

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