1. Taper is ok. Tapers are allowed in code construction and are common in industry.
2. No complications over 15psi; except below some comments:
High pressure drop requirements (over 15psi) can significantly increase thickness of these plates. I once had to design a partition plate for 100%...
You need to choose RT based on service conditions, customer specifications, and the Code rules for the material and thicknesses that you are working to.
The effective width (br) is half the width of the Partition thickness up to 1/2" pp thickness. The actual equation is:
b0 = Gasket Width / 2 ; if b0 > 1/4", br = 0.5*(b0)^0.5 ;; if b0</= 1/4", br = b0
It is probably easiest to change the gasket material. Another option, depending on...
Hi all,
I have a customer looking for confirmation that they can substitute phased array UT testing for RT in high pressure/temp P91 and P22 steam piping. I believe the boiler manufacturer only wants to accept RT and our customer wants to use UT. I looked in power piping and it looks like you...
Your configuration is showing Cat C Type 7 joints. RT/UT is not applicable for these joints since there is no applicable efficiency. They need to meet UW13 for corner joints, and you can meet your efficiency of 1 requirement on the vessel. There are other examples of this case in Code...
Thank you for the input. I appreciate it.
I looked at the product data sheet on the SAW filler/flux combination LA71 w/ 880M : F7P8-EM14K-H8
The published data in PWHT condition is 63ksi yield, 80ksi tensile, 31% elongation and 121ft-lbs @ -80F
The 80ksi would be stronger than the SA516...
I was wondering if anyone has a recommendation (pros/cons/discussion) for filler materials for SAW SA387 GR22 (P5A Gr1) to SA516 GR70 Normalized (P1 Gr2). I am working to ASME Sec IX and ASME Sec VIII D1 and D2 vessels.
I need to expand a weld procedure to incorporate the dissimilar weld metals...
Are you working to a CODE? If you are strictly working to ASME Sec VIII D1 for a pressure vessel, then Refer to Fig UW-3 and UW-12. If you have a slip-on flange it is a Cat C and RT is not applicable (not required) even if the whole vessel calls out for a degree of examination. If you need to do...
There are more than 1 type of tubesheet (boiler tubes, condensers, heat exchangers, etc..). If you have a HEI Condenser then HEI says 500 RMS, typically TEMA heat exchangers have 125-250 RMS tubesheet hole finish. If you are looking at enhancing the tubejoint with a surface finish then you...
From a vendor perspective, the allowable loads are calculated per HEI for Surface Condensers Appendix D (simplified WRC107 calculations). You simply look at the max moments (load=0) and max load (moment 0), then you make the linear plot. Then you check where your pipe load lands and it is...
I agree with Gr2vessels comments about a simple structural calc. I made a spreadsheet for calculating custom davits for large covers (I just did a 54" dia 3200# cover w/ davit) basically I do the following:
-look at the stiffness a cantelever beam - using moment of inertia etc... (I usually use...
Does anyone know what material ASME SA235 Gr P2 is? It is called out as a seamless pipe on an old 1964 U1-form. If I had to guess it would be 1/2Cr 1/2Mo, but I have not had success finding it (is it similar to SA335 P2?).
I would follow TEMA RCB 5-13, which is very generic but correct. You need to use good judgment. I'm not sure I understand your question completely since coating and lubricants can mean a lot of different things to different people. Maybe some more detail in your question would help.
I agree with the other post, however, I would add that there is a slight preference in expansion. The tubesheet will "grow" as you expand the tubes into the tubesheet and it is cumulative across the holes. You will see this effect much more when the materials are soft copper alloy. Therefore it...
I was wondering which interpretation of length over-tolerance is correct for a 5/8" dia 35' tube. It doesn't really matter in that we would prefer less trim length and I would like to know which interpretation is correct.
Per Table 4 ASTM A1016
Welded Tube <2" Cut Length over tolerance [+1/8"...
In time dependant material properties Creep failure is an additional concern. When you are in time dependent properties a detailed fatigue analysis is required. That anaylsis is time consuming and can be expensive. Depending on design temperature like say 800F, it is generally easier to just...
I assume you have the thermal rating (thermal gaurantee see HEI) the vendor gave you. Then what you can do to check is that the sum of the resistances (including fouling) equal 1/U that is given for the zone. The vendor's rating should balance. As noted in the standard there is no shell side...
