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Thank you sir.

We are procuring PSV from one of reputed vendor where there is a remarkable difference between effective and actual discharge of orifice. Vendor has selected "R" type orifice as per API520, with effective discharge area as 10322mm2. However actual discharge area for the same is specified as...

COMPRESS gives warning for plate material only. Exemptions in Code are for circumferential welding of pipe and tubes for certain cases and thermocouple attachment weld. Do you have any interpretation about plate material where it is exempted? I think for all thickness of plate material PWHT is...

Thank you all for response. Mech2325, Table UCS-56-4, General Note (a), in ASME Sec.VIII, Div.1 has reference for PWHT mandatory.

Adding to above, which means my vessel shell, dished head, girth flange and blind cover entire to be PWHT. Is there any more conditions which can exempt PWHT for this situation?

Mech2325, thank you. As I see in Table UCS-56-4 applicable in this case, General Note (a) says PWHT is mandatory in all conditions, exempted for certain pipe and tube cases and ERW case. Which means other than exemptions it is PWHT mandatory for vessel made up of SA-387 Gr.5, Cl.2. please help...

PWHT, is it mandatory for low alloy steels such as SA-387 Gr.5, Cl.2 plates for all thicknesses? In my project vendor has provided PWHT for all such cases for entire vessel. please someone guide.

What is the difference between "Design by Rule" and "Design by Analysis" in Sec.VIII Div.2? When we have to apply either of them?

I am user.

What is additional requirements and method is required to handle Div.2 code stamped equipment. I have used sec.VIII Div.1 but not Div.2. Can someone please summarize.

Hi Idrus, In my opinion if FE Analysis to be carried out, it is better to be performed for entire tank. I am considering design standard as, API620 (no ASME consideration at all)for entire equipment. API 620 temperature limit is applicable for entire tank and hence to design same tank for...

This is API620 tank and not ASME vessel for sure. However as design temperature is beyond API limits need additional thermal analysis (FEA).

difference between TEMA thick expansion joint and ASME app. 5 expansion joint?

Thank you EdStainless for your quick reply. Please let me correct my question above. Actually my vendor has come with excuse that he has over expanded the tubes lengthwise. Which means it is expanded beyond the inner face of tubesheet. Even though thinning of tube is not much in this area (just...

It was happened the over expanding for shell and tube exchanger during the expanding work. (Tube min. required Th’k : 2.77mm, Tube Th’k after expanding : 2.70mm) IS this acceptable?

For carbon steel pressure vessel what is the criteria for choosing SA 516 Gr.60 or SA 516 Gr.70?

As per TEMA ninth edition, RCB-8 Flexible shell elements, for design of thick expansion joint Finite Element Method is applied. Does it mean if we are using TEMA and ASME as design standard and code respectively, we can not apply Kopp & Sayer method for design of thick expansion joint? What...

metengr Where is it specified that 25mm is wall thickness and not tube OD ?? I have tried searching ASME IID, Sec VIII Div1...but could not locate this one.

thank you for response.. yes i am concern about design of tubes as per ASME Sec.VIII Div 1 ... i am also curious about supply of tubes of this size in this material...

Subject data is not available in ASME IID, also no size limitation in ASME Sec IIA. What allowable values can be used for these tubes? IS it ok if we use values for 1"size tubes? or chaning the tube size to 1" from 1.25"is the only option?