Cost is not an issue and do right thing to avoid Loss of Containment is the most important. A single leaking will cost money to fabricate thousands of spools and also an environmental disaster.
Hi, Metengr, great point regarding code language and engineering judgement. It is always good to have questioning attitude about the codes and standards.
There is another issue regarding the branch connection weld. some engineers consider the groove weld of branch to run pipe as pressure containment weld, and the groove weld+ fillet weld of repad to branch is non-pressure containment weld/ attachment weld/ Weld reinforcement. IS this reason for...
Hi, DekDee, and Metengr, I appreciate your great insight on this PWHT issue. I have compared B31.3 and B31.4 and found the discrepancies between the codes.
From B31.3, as mentioned by Dekdee, PWHT requirements are based on "control thickness". For the branch connection with repad, the control...
I have questions regarding PWHT on ASME B31.4 piping welding
"434.8.9 Stress Relieving (a) Welds shall be stress relieved when the effective weld throat (see Fig. 434.8.6-2) exceeds 1 1/4 in. (32 mm)..."
But there is another clause:
"The thickness to be used to determine the stress-relieving...
Thanks a lot!
I thought the aixal expansion of a hollow vessel is free but the raidal expansion of a hollow vessel is limited by itself. It seems I am wrong.
I am working on a thermal expansion estimate of the nozzles on a cylinder vessel for the purpose of piping stress analysis.
Could you please give me some advice or referecne materials to calculate the thermal movement of the nozzles on a vessel.
I appreciate your help greatly!
I got a vendor drawing from Germany. The pump outlet marks with "ZX-M 200, 8"". I know the pump nozzle is 200 mm (8"). But I am not sure the connection type (flanged, welded or grooved), and what the meaning of ZX is.
Any advice will be appreciated greatly!
Thank you guys!
MJC, I read ASME B31.3 again and move forward to ASME -VIII for external pressure evaluation. And Pressure Vessle Design Handbook recommended by BigInch provides excellent reference as well to get the minimum required thickness.
But when I use those reference, I find that all the...
Hi, all,
I am working on a suction gas duct (thin wall big size CS duct) with negative internal pressure. and wondering how to calculate the minimum duct wall thickness to avoid collapse? I searched the ASME B31.3. The code only gives minimum required pipe wall thickness due to positive internal...
I am working on expansion loop design for a mining project. after I calculated the thermal expansion of the whole pipeline, I met the problem of sizing and spacing the Eloops.
I have used the method introduced in Design of Piping System by M.W.Kellogg to decide the dimension of the Eloops. And...
BigInch (Petroleum) 25 Jul 09 22:47
I guess I don't understand what equipment that is sensitive to movement you have at the tailing pond.:
The reclaim water is taken form the tailing pond by a pump and sent to a tank. It means the reclaim water pipeline is connected to pump discharge...
I got much more information from P&ID:
A 8" PE tailing pipeline is from a pump house to a tailing pond. One end of the pipeline is connected to carbon steel pipe and another end is free.
Another 8" PE reclaim water pipeline is from a pump in the tailing pond to a tank. Both ends of the pipeline...
Another question: how to design anchor block for PE pipe?
I know some kind of anchor block for carbon steel pipe. They were welded on the anchor directly or built in a concrete block.
Morning, C2it and pennpiper,
Thanks for your prompt reply.
The 8" pipeline will be above ground and with the guide to support it.
Pipe materials is PE. I don't know why it isn't HDPE and the pressure is 135 m.
