thread292-374408
When Appendix HH refers to Appendix A for the leak testing, does it mean U tube bundle expansion joints are also covered under this Appendix? If HH-1(b) and HH-1(c) are required, then Qualification test is not needed.I assume in a U tube bundle, a single tube is joined to the...
Is there any relation between the shear load test of an expanded tube to tubesheet joint and the leak tightness of that joint? I'm struggling to understand if the mechanical design is confirmed by such mock-up testing, how joint efficiency and the leak tightness are related to such destructive...
Shear load testing or pull out testing of fully expanded tube to tubesheet joint at lab conditions may not prove the joint integrity at the operating conditions. Though this is only a mechanical strength test and not a leak test, how this mock up test can ensure that the maximum allowable axial...
I've read serious furore over the purpose of such pressure testing, calling or guessing it as strength, full stress, proof, integrity, load test, confidence, second NDE, simulation, mock-up and so on. My question is towards a paper submitted by a Japanese company in one of the Pressure Vessels...
In most safety relief valve construction, the service fluid does not come in continuous contact with the body material. Is it an acceptable practice to design the pressure relieving valve body based on pressure and temperature alone ignoring the fluid corrosion/erosion properties? I have not...
Under what conditions Shell and Tube heat exchanger internal bolts found in floating head flange, baffle plates, tie rods need not be lubricated or coated? I understand the process fluid generally washes out the coatings on the fasteners. In that case, the available clamp force on the fasteners...
Are there any guidelines as to when a mock-up of tube to tubesheet joint would be recommended? Such an 'engineering judgement' is highly subjective, similar to defining what is 'critical'.
What is the best sequence- preferred order of rolling or strength welding of tubes on a tubesheet layout in a shell and tube heat exchanger? I'm interested in knowing how to determine the order and how it affects the tubesheet warping or is it just based on convenience of fabrication?
Please refer to ASME Section 1 Table PW-39-1 to 13 or ASME Section VIII Table UCS-56. There is only minimum holding time for PWHT requirement. I don't see a re-qualification requirement when the holding time exceeds in a disproportionate manner....actually it happened - the contractor cooked the...
Why in some jurisdictions (Alberta) 95% of emergency relief capacity is to be smokeless when it's more than 450 Btu/ cu ft? Is there any evidence that the emission level becomes unacceptable if above Ringelmann smoke chart #1? I mean other than nuisance or colour in atmosphere, any harmful...
Issues: maximum and allowable reinforcements are not defined; how to measure thick and thinner section welds are not known; whether the thickness of weld or plate includes crown and root penetration is not known; weld thickness t seems to be same as thinner component thickness; surprisingly...
Has it been proven that carbon steel surface needs coating system to prevent CUI. I understand there are various factors that control the CUI, coating system alone cannot prevent. The new API RP 583 does not address selection of coating system. It's easy to say that one need to select a right...
Please refer page 205 of ASME Sec I A 250.2 terminology, ASME Sec V T-434.5.1 h) on page 47, ASME SEc I Fig PG-42.1 on page 36. Issue: What is the thickness t as referred to in A-250.3.3 and A-250.3.7, whether it includes weld reinforcement? When we define t, is it the least of thickness of weld...
Refer Section VIII Div 1 U-1(e)(1)(c). Are there any interpretations or code cases clarifying whether the bolts on the first flanged piping nozzles on a pressure vessel belong to piping code or pressure vessel code? The issue is for service and temperature specifications as the connected piping...
When there is enough evidence to prove that the notch toughness decreases with extended soaking time, why ASME code does not specify maximum limit on the soaking time for PWHT?
