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Thank you for you quick reply. That is exactly what I mean: In our case we have a piping with a Diameter <114,3 mm and the Controlling Thickness is w<7,1. In EN 13480-4 Table 9.14.1-1 (5.1) Footer e tell us that we can renounce PWHT for These condition. Attached you will find, for better...

Dear all, is it right that according 13480-4 (Metallic Industrial Piping/ Fabrication) Materials of Group 5.1 (f.e. 13CrMo4-5) do not need any PWHT (d<114,3 w<7,1 Preheat Temp. 200°C)? We have a lot of experience with the German AD 2000- Rules; in the AD the PWHT is not a function of diameter...

Thank you very much. It seems not easy... After recheck with our third party now we know that our equipmnent is under IBR.

:-(

Dear all, the equipment is an Evacuation Unit for Turbine-Condensers in Power Plants in India. The unit consists of a Surface- Condenser, Motive Steam Piping and Suction Piping (one skid). The unit is not directly connected to the boiler. DESIGN DATA: Surface Condenser Tube Side (Cooling...

Thanks for your reply & for the thread. It really seems that we have to use low alloy steel.

Dear Ione, thanks for your quick answer. But the problem is that this table is for B31.3 Process Piping and not for B31.1 Power Piping . It is right that for B31.3 the stress value or ,in fact, the allowable Temperatures are higher for Material SA 106 Gr. B. But the customer wants B31.1 also...

Dear all, reg. ASME B31.1 Power Piping the use at temperatures above maximum in stress tables given is generally not permitted. That means in fact you can use ASTM A106 Grade B until 800 °F (426°C) for Power Piping and not above... Are there any exceptions? For example low pressure? In our...