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For a weld P1 - P8 plates (fillet weld & same thickness) is it mandatory to have chemical composition of test coupon in PQR? Also, what part in Section IX says about need to list also hardness of test coupon? Service is non-corrosive and it is a tank. Thanks, Cormet

Hello, Is it mandatory in the US to place labels to ID service & flow on pipes in Polyethylene plants? Thanks

EdStainless Yes, these are centrifugally cast tubes.

Colleagues, Alloy is 35Cr45Ni (no ASTM spec to reference). 1. Furnaces are being erected and it was noticed that some of the tubes have multiple rust spots, typically these results from carbon steel contamination. I'd like to hear your expert opinions on expected damage mechanisms if carbon...

you've mentioned that if water is present, then it is corrosive. where can I find these corrosion rates publised?? I've already tried CORSUR (NACE) w/o luck!!!!!! Thanks, Cormet

Pure Isobutane. No other chemicals present.

where can i find corrosion rates isobutane Vs. carbon steel and isobutane Vs. austenitic stainless steel?? Temp : 100F Press : 225 psia Cormet

I've seen Hardness Vs. Tensile Stregth (for carbon steel) i API RP 579. Cormet

Best option is Duplex stainless steel type 2205. Be advised that if component is going to be used in pressure containing part or vessel, ASME code limit use of duplex to less than 600F.

Does anybody have reported Corrosion rates of Isobutane in Carbon steel?? Where can i find such data?? Thanks, Cormet