Radiography for Forged valve

[nasrath ali]

Dear All,

As per API 6D, testing for Valves, Code does not call for Radiography Testing for Forged Valves, whereas RT is mandatory for Cast Valves.

Kindly clarify the reason for not stipulating RT on Forged Valve

Thanks.

[MRTEJS1]

Dear 

Understand what type of defects in both different materials,then you understand why specific requirements of UT or RT

Tejas 

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[james gerald]

There are some differences between Cast & Forged products.

CAST VALVE                                                                             FORGED VALVE

1. Castings are normally associated                                          1. Except Hot shortness not much defects in

    with defects and Inclusions which                                               Forgings which can be controlled.

     affect the Integrity of the valve

2.  Normally no Heat Treatment after castings                           2. Forgings receives Grain refining Heat 

                                                                                                        Treatment and better rpoperties.

3. No limitation on Sizes of Valves                                             3. Only smaller sizes mostly

4. Low cost                                                                                 4. Higher cost

RT is specified only to Cast valves because it is prone to Defects like Porosities & inclusion.

Thanks & Regards

J.Gerald Jayakumar

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[nasrath ali]

Dear Mr. Gerald,

Appreciate your response. It was helpful.

Thanks.

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