Cast pressure retaining materials as pump casing

CHTI · **Joined:** Tue May 04, 2010 9:12 pm **Posts:** 13

Hi,

According NB 2571, casts products shall be examined by radiographic examination.Acceptance examination shall be according table 2571-1.
In paragraph NB2575.1 it is written that cast pressure retaining materials shall be examined by radiographic method when specified in the order for the original castings.
In paragraph NB2575.2 it is written that radiographic examination shall be performed on pressur retaining casting parts as pump casing,and the extent of this control shall be of the maximum feasible volume.

My question:
What does it mean original casting?When it is specified in the order?
We have a cast pump casing,statically casted, in austenitic stainless steel, to supply according section NB . Is it required to perform radiographic examination?
I don't understand the correlation between table NB 2571-1 ans the paragraoh NB 2575-2.What is the inlet piping connections for a centrifugal casing pump?

Thank you for your help.

Regards

Jackal · **Posted:** Mon Sep 13, 2010 8:49 pm

Find the original order to which the casting was made. For example the casting was probably manufactured to a specification.( Material Specification and/or Design Specification etc.....)

The "specification" may require RT (supplementary reqts.) as agreed to between purchaser and manufacturer.

Dilly · **Posted:** Sun Sep 26, 2010 12:36 pm

Hallo,
pump casings according to ASME Code Section III - Class I (NB) made from austenitic stainless steel shall be examined as per Table NB - 2571-1.
Type of examination depends on the size of the Inlet Piping Connection, which is defined as the inside diameter of the suction nozzle of the pump.
Minimum volume to be covered by RT is given in Figure NB - 2575.2-1

The reqiurements given in ASME Code Section III are always the minimum requirements to be fulfilled. The customer may require additional examinations.

Hope this will clarify your question.

Dilly

CHTI · **Joined:** Tue May 04, 2010 9:12 pm **Posts:** 13

Thank you for your answer.
But, for a cast pump casing which have a suction and a discharge flange , how we can understand the " Inlet Piping Connection"? Is it the suction flange?

Regards.

Dilly · **Posted:** Mon Sep 27, 2010 9:39 am

Hallo CHTI,

no, in this case it is the inside diameter of the suction - nozzle, to which the flange is welded.

Dilly

CHTI · **Joined:** Tue May 04, 2010 9:12 pm **Posts:** 13

Hi dilly,

Thank you for your help, but in my case there is no welded flanges on the casing pump!
Flanges, suction and discharge " comes" directly in one part from cast pump casing.
In this case what diameter we have to take into account?

Regards

Dilly · **Posted:** Mon Sep 27, 2010 6:27 pm

Hallo CHTI,

no problem. If the flange is casted on, also the inside diameter of the suction side nozzle is the one determines range of NDE.

Regards

Dilly

CHTI · **Joined:** Tue May 04, 2010 9:12 pm **Posts:** 13

Thank you Dilly for your help !

Regards

Gonzaga · **Joined:** Sat Dec 15, 2001 1:00 am **Posts:** 656

In a pum the suction flange is the bigger of the two :wink:

Mauro.

Cast pressure retaining materials as pump casing

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