I'm Pamella* i'm manufacturing a Shell-Tubes Heat Exchanger* according to API 660* and also TEMA R.* but i have a problem about the manufacturing process of 2 flanges* they had to be According to ASTM A105N* but in Peru* we don't fabricate them* because of the dimensions* we are talking about 25in. (diameter)* and they doesn't match with the dimensions of the Standard Flanges A105 25in. 300#*so* that's why i have to manufacture them* because import them* will take so much time* and i don't have enough time.
I will be pleasure if some of you can help me about the difference between forged and casted flanges*
I'll change forged to casted flanges* i'll manufacture them according to the ASTM A216 Terms*for the WCB Grade* but i've seen that they mention some heat treatment that depends on the chemical composition* how can i select it?* is it correct just to normalized them?or they'll need also Quenched and Tempered* as they mention in ASTM A703?
I'll Want to know how can i select the correct heat treatment*including the temperatures* number of cicles* and the duration of each of them* and if it exists some risks on changing the manufacturing process* from ASTM ASTM A105N (Normalized)* to ASTM A216 Gr. WCB?
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