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Hello Folks! I am just want to know how to correctly apply the ANSYS Transient-Thermal analysis with a Structural analysis in order to perform a complete welding simulation and visualise the final distortion and residual stress field. I have done some thermal simulations with appropriate...

Hello all! I have a series of specs which asks for the use of the 17-4 H1150 Precipitation Hardening Stainless Steels in the stem and trunnion of ball valves. Until now, what I know is that this is a very good material for corrosion and high yield and tensile stress. The use is in the entry...

Thanks wedstan!

Hello folks! I am taking an specialization on Welding Engineering and I need to do a final monography. I tried to take a look on good tremes for the Oil and Gas Industry on Welding Magazines but could not get a good view on which Theme could be good and interesting to decide. Could someone...

Hello all! Is there any specific criteria (temperature, material, etc.) to use coated carbon steel bolts instead of alloy steel bolts in stainless steel piping or machine anchoring?

Hello all! I have an interesting issue here about the interaction between mechanical engineering and instrumentation engineering. It came to my hands the ASME PTC 19.3 (2010) which scope is just about designing thermowells against resonance and fatigue. It is a really interesting norm that...

edmiester, Please take a look on the API 653 - 9.2.3 Weld Joint Design and 9.7 Repair of Shell Penetrations, since this norm is fit for your scope.

Thanks Ripz. I opened another thread about this issue, since no forced convection was considered in the duct: http://www.eng-tips.com/viewthread.cfm?qid=360364.

racookpe1978. Thanks for your help. 1) Remember, if your gas stream needs to be 515 dec C, then you spent a LOT of money heating it up to 515 deg C and you don't want to cool it off and waste your money. Is it worth the saved money between a A36 bellows and a stainless bellows to lose all of...

Thanks racookpe1978. You described the phenomenon just perfectly. Thanks. We are just finishing the construction of a Reformer Furnace for a Hydrogen Generating Unit. The designer / supplier used ASTM A36 on an expansion joint on a breeching duct that is subjected to a 515°C stream, but the...

MortenA, I have to agree with you. On my researching, I found importance only for CO2, when epsilon becomes 0.15 and for water vapour. Thanks for the tip!

racookpe1978, yes! The duct carries hot air at 515°C (788,15K). IRstuff, the radiation heat exchange occurs from hot ~800K air to surface inside the duct. I think it is just a matter of the gas itself: hot air and its emissivity. I know that, for CO2 it is around 0.15 @ ~800K & 1 atm. Using...

Hi There, The problem is: I have a duct carrying a high temperature stream. I have modeled the problem this way: I was asking my self if, inside the pipe where there is a 515°C hot air stream, radiation occurs together with the forced convecction. Thanks

This question had an evolution. Since the item 12.5.4 of the API STD 560 says "If metal temperatures exceed 425 °C (800 °F), stainless or alloy steels shall be used." and the stream is at 515°C. I have done some calculation and the wall temperature of the ASTM A36 due to radiation and forced...

I have a carbon steel (CS) use at high temperatures issue here . We are just finishing the construction of a Reformer Furnace for a Hydrogen Generating Unit. The designer / supplier used ASTM A36 on an expansion joint on a breeching duct that is subjected to a 515°C stream. It is fact that the...

I can conclude from here that threaded joints are: [ol 1] Directly dependent on workmanship: either on the assembly and in the maintenance; More dependent on fabrication issues and more difficult to be monitored in terms of quality; ASME 31.3 does not determine its use or not in most of the...

GTME12, moltenmetal and zdas04, I really agree with you and I believe that the practice to seal the threaded joints is just a way to solve a problem easily. It’s easier to prohibit rather than teach the issues and cautions during assembly and maintenance. The ASME B31.3 (2008), para. 314 is...

I work for a big Oil & Gas firm that prohibits the use of threaded joints for pipes carrying flammable fluids (gasoline, diesel, naphtha, natural gas, LPG or whatever) subjected to any pressure or any temperature. For example, when we acquire a machine, we have to make them seal all the...