Regarding design and working pressure

Prasad Rode

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Sep 10, 2016, 12:30:42 AM9/10/16

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Dear sir / experts,

As we know that, hydrotest pressure = 1.5 design pressure.

Then, in the same mathematical way, what is relation between design pressure and working pressure.

Pls help.

Regards

Prasad Rode

Lakshman Kumar. B

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Sep 10, 2016, 12:59:32 AM9/10/16

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Hi friend,

Pls check it once, HT pressure will be 1.5 times of working pressure, or 95% of the design pressure, but not 1.5 times of the design pressure…

Understand the concept …. (it might be a pipe line, or a vessel)

1. Working pressure is defined for which the system is to be worked (ex. 100BAR)

2. Design pressure is defined for which the system is defined, it is always higher than working pressure to ensure safety and considering all the constructional stress i.e we can say 1.5 times of working (it will be 150BAR, in the above case)

3. Hydro test pressure – should be above working and below to the designed – as your system is designed for 150BAR – you cannot test it for 1.5 times of the design pressure say 225 BAR, test pressure will be always less than 150bar to ensure system safety. or else in extreme case you can go up to 150 Bar – 100% of the design pressure – but not more than that

Thanks & Regards,

Lakshman Kumar B,

+91 9440031459.

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Vijay Patre

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Sep 10, 2016, 6:35:37 AM9/10/16

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Dear friend,
Please provide basis for trailing email quote.

General assumption is not applicable for such a hydro test pressure.

Regards,
Vijay

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Lakshman Kumar. B

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Sep 10, 2016, 6:55:29 AM9/10/16

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Please let us know complete details,

Which code of construction?

Service?

Client spec?

Any special considerations?

Thanks & Regards,

Lakshman Kumar B,

+91 9440031459.

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Prasad Ghanekar

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Sep 10, 2016, 11:07:03 PM9/10/16

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For hydro test pressure please refer UG99 b of ASME Sec. VIII Div. 1.
Generali MAWP is designe pressure.

Regards.,
Prasad G.

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Prasad Rode

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Sep 13, 2016, 12:45:48 AM9/13/16

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Dear sir,

Which code of construction B31.3

Service. Process line

Any special considerations, NA

Pls reply, I want to conclude it.

Regards
Prasad rode

George Dilintas

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Sep 13, 2016, 7:30:02 AM9/13/16

to Meghanadh K

There is no. Design pressure is usually higher to provide some margins of safety. For the Code what matters is only the MAWP. For PED is the PS

Prasad Rode

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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

MW

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Sep 16, 2016, 11:10:13 PM9/16/16

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MAWP (API570)
The maximum internal pressure permitted in the piping system for continued operation at the most severe condition of coincident internal or external pressure and temperature (minimum or maximum) expected during service. It is the same as the design pressure, as defined in ASME B31.3 and other code sections, and is subject to the same rules relating to allowances for variations of pressure or temperature or both. If the piping system is being rerated, the new MAWP shall be the rerated MAWP

Relative_Design_Test_Pressures_and_PSV_Set_Point.pdf

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