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Hello all, I was checking the ASME B31.1-2004 and ASME B31.1-2007 and I noticed that the maximum allowable stress values in tension (table A-1) have changed from 2004 to 2007. Did you know that? Why has it changed? Materials have physical properties fixed Thank you very much, Regards, Rocio

Hi all, For pipeline ball valves (2500# gas service at 85ºC), my client wants stem packing instead of O-rings + gasket design, however, the suppliers give us the O-rings + gasket. Is it normal that the client want? What does he mean with "stem packing"? Thank you very much, Rocio Rodriguez

Hi all, I have a material specification where the stud bolt used for steam, condensate and hot-water at 300 ºC and 20 barg is CK35 galvanized. I would like to know if the stud bolt material given is ok for these services. On the other hand, is it possible used the galvanized piping...

Hello all, I would like to know if exist some rule in the selection of the wedge type (solid, flexible, parallel slide, double disc, etc) of the gate valve. In the valve specifications that I have, the solid wedge is used for all diameters in 150# and for diameters lesser than 2" for 300# to...

Hello all, I have to calculate the insulation thickness for a carbon steel (A 106 Gr.B) pipe of 4" sch.40, whose conditions are: - temperature exterior: - 15ºC - temperature interior (liquid inside pipe): 20ºC How can I calculate this thickness? I am considering as insulation material, the...

Hi all, I am preparing a list of lines classification according to PED/97/23/EC and I have a problem with the fuel oil. I do not know the composition of the fuel. The data that I have are: Pdesign(max) = 18 bar(a) Tdesign(max) = 80ºC piping diameter = 4" I know that the fuel belongs to...

Hi all, I need to know the vapor pressure for the fuel oil at 80ºC but I do not have the composition of this fuel. The pressure and temperatutre design conditions for this fuel are: Pd = 18 bar (a) Td = 80ºC Thanks in advance, Rocio Rodriguez

Hi all, In ASME B31.1 ed. 2004, the SE to be used in the wall thickness calculation formula (para. 104.1.2) has to be taken from Appendix A. The value given in the Appendix provides "Maximum Allowable Stress Values in tension" and E/F (joint efficiency/cast factor) in separate columns. In...