Thank you for your help.
UG-43 is based on ratio of allowable strength of the materials (screw and component) and diameter oh the bolt/hole and everything is clear.
In these days checking the different codes I also found a similar formula in EN-13445-3 code, but I don’t understand why the...
Hello,
I have a heat exchanger where tubesheet has blind threaded holes where a flange is bolted.
Does it necessary to calculate the length of the threaded holes in the tubesheet?
It doesn’t exist a formula in tubesheet chapter to check it according to ASME.
Can we follow good engineering practice?
Hello, I am a young project manager and I have a problem with a client because of wrong commercial clarification during bidding phase.
Unfortunately commercial guys confirmed for installation of steel platform without considering the price for this.
This involves 20.000 € don’t considered in our...
Unfortunately we don’t know the bolts temperature without a thermal analysis and this is the first doubt.
My concern is not about the bolts because SA-193 B7 has an important yield/tensile strength, so they can absorb an additional load due to thermal expansion.
To me the problem is that this...
Hello, I have a heat exchanger flange in stainless steel with bolts in low alloy steel at high temperature (400 C) and camprofile gasket in stainless steel.
The code is ASME VIII div1.
We checked the flange with appendix 2 and then with ASME PCC-1 appendix O to check the joint against leakage...
Step 5 and 6 of paragraph O-4.2 of ASME PCC appendix O isn’t verified.
To solve this we need to increase bolts size to create higher stress on gasket but this involves higher stress on flange and this means to increase flange thickness as well.
At the end, a common calculation with appendix 2...
Hello, I checked a girth flange of a heat exchanger in accordance with ASME VIII div1 appendix 2, as per project specification and everything is verified, but if I check the flange with ASME PCC-1 appendix O as well, the verification isn’t ok.
Bolts are not enough to seat the gasket.
In this...
Hello, I noticed a client request that we never had before regarding calculation of stacked heat exchangers.
We have two AES type in stacked and client asks to calculate the stress due to Thermal expansion of connecting nozzles, does someone can help me? In other projects clients never asked to...
Hello guys,
I have to calculate a bolted joint with two welding neck flanges against high pressure with a particular gasket that I never used.
This gasket has trapezoidal shape and I would like to know if it exists a calculation for this type of gasket.
Code is EN13445 and pressure is 280 barg...
Hello everyone,
I am checking a calculation of a pressure vessel, where the operating temperature is 480 C and design temperature is 510 C for SA-387 gr.11 cl.1.
In this case In accordance with ASME code the design temperature for this material is in creep range, so in my opinion design...
Hi everyone,
I have a unusual case, with a small pipe with two flanges ansi b16.5 3” #300 and two blinds (equipment ASME VIII div1 stamp).
Pressure is 8 barg and temperature 70 C material Carbon steel.
In this case I need to verify standard flange against external loads with UG-44b and...
Ok but at 100 C we have tension vapour already at 1 barg, so to me this means that water should be considered out of liquid phase. For PED it is valid only from 109 C but I can t find in the legislation the paragraph
Hello,
I can’t find in PED 2014/68 UE legislation where water is considered as gas only at temperature higher than 109 C and not from 100 C. Does someone can help me please?
Good morning,
I have to calculate thickness and bolts size of a motor support plate welded inside a pressure vessel shell course with ASME code.
The support has circular shape and a hole at the center with the motor bolted on plate by 12 bolts 1” type (like that ones on reverse flange).
In this...
It is a client’s request when corrosion allowance is on the flange. I added an axial load and bending moment and calculated an equivalent pressure. Ah the same time they want I verify the rating and thickness of the flange against corrosion allowance
Dear gents,
I have to check a long welding neck 2” #300 with corrosion allowance (3 mm) and external loads with ASME appendix 2, but doing so I found that MAP is lower than MAWP.
The required thickness is 20.3 mm and with LWN standard we have 20.7 mm.
I don’t understand how it is possible that...
Hello everyone,
I am designing a heat exchanger and I noticed that Mawp is limited by nozzle flange on shell side and a vent from tube side.
In accordance with API 660 nozzle reinforcement (reinforcing pad) Can not limit Mawp but in this case the mawp is limited by a flange and a opening. Do you...
