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To eliminate siphon effect some people drill a very small hole on top of inverted U pipe (within the tank) to equalise the pressure.

Thanks guys!

Is there any rule of thumb on the minimum thickness range within which ultrasonic inspection application on SS pipe welds is effcetive?

Thanks SJones. Will flourocarbon coating to CS bolt/nuts of any good?

Does anyone has any experience and/or advice with regard to corrosion aspect of mating stainless steel pipe flange to carbon steel flange? Will there be any galvanic corrosion? What materails to be used for bolts and nuts?

Can anyone enlighten me about what codes to refer to if I want to use SS instrument tubes and fittings for process fluid, say for chemical dosing purpose? I only come across ASTM material code such as A269 but not codes for design and use for tubing such as ASME B31.3 for piping. Thanks.