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
On Wednesday, 6 December, 2023 at 08:53:31 pm IST, nasrath ali <nasrathbinliyakath@gmail.com> wrote:
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.
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