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Thank you Bunji51. best regards, Mandeep Singh

Hi, I am looking for some reference for the bolt root area for bolts with 10 threads per inch. The TEMA standard has series 8 bolts above 1in. This is for 11/8 nominal size bolts. Thanks. best regards, Mandeep Singh

I am evaluating a body flange on a vertical vessel with an agitator on the top. The agitator is located in the center of top head, head is connected to the body flanges. Client has given considerable loads originating from the agitator. Among other loads, the torsional moment is considerable...

Roca, I do not get this, see below, Dead Weight of Vessel DW 40849.7 N Operating Weight of Vessel ROW 40849.7 N Earthquake Moment on Basering EQMOM 60532132.0 N-mm Wind Moment on Basering WIMOM...

My understanding is similar to one of the post in the thread quoted by bernoullies123. The load has to transfer from the lug to the pad and then to the shell. If your pad is very big then the pad and the shell may not behave as one unit. Specially if you have bending moments and outward pulling...

Has any body seen welds with unequal legs. So, weld leg on one side is 0.5in. and on the other side is longer. Try to increase the hub length of the flange. By increasing the weld length but only along the shell. best regards, Mandeep Singh

I have one more question. What would be the consideration for tongue-groove v/s male-female type flange. Tongue-groove would be more confined and provide protection for gasket on ID and OD. Tongue-groove can use a ring gasket, a smaller gasket than a M/F facing. Why would you want to use a...

Thanks for the wisdom guys. best regards, Mandeep Singh

Thanks to all of the comments, B16.47 type flange gives a much thicker flange. I had to move the bolt circle diameter very close to the gasket to reduce the moment arm. Hi Ibrahim, Did you mean moving BCD close to OD? should it be other way round, closer to gasket reaction diameter G. Hi...

Yes, Thanks for bringing up good points. The spiral wound gasket would have problems at large diameter. I am considering Camprofile Flexitallic PN style gasket. They told me that it has metallic serrations so we do not really need an outer ring. I still like the gasket with outer ring...

Thanks Mike, Thanks for the feedback. I checked the rule of thumb also. The flange rotation controls here. A colleague of mine brought it to my attention, that increasing the flange OD reduces the K factor and reduces the flange required thickness. I read the Fig 2-4, gen. note (b), but...

Hi colleagues, I have some question on large diameter flange design. It is 72in (100 psi) flange operating at not very high temperature. I started with a raised face flange. Is there any benefit of using flat face v/s raised face v/s male-female type of flange face. I can also try...

Hi Rsaeed and Prex, You have correctly stated that this is an iterative procedure. I will clarify little further. In PV Elite there are multiple calculations for external pressure, 1. First the program computes the required thickness from external pressure specified for each section. 2. Then...

I had a typo in one of the formulae, here is the correct one, Centerline radius, Rf = 0.17 * ID + tnom / 2 = 0.17 * 3500 + 75 / 2 = 632.5 mm You can ask your client to use the updated PV Elite version. On your query of hydrotest allowable, ASME Div. 1 code does not provide a hydrotest...

good response Tom. best regards, Mandeep Singh

I will try to clarify the issue, Elliptical head inside diameter, ID = 3500mm Head nominal thickness, tnom = 75mm Centerline radius, Rf = 0.17 * ID + 75 * tnom = 0.17 * 3500 + 75 / 2 = 632.5 mm Percentage elongation = 75t/Rf (1-Rf/Ro) = 75 * tnom / Rf * ( 1 - Rf / Infinity) = 75 *...

I do not have the book in front of me right now, but it is probably TEMA paragraph RCB-9.21 (8th ed.). I do not know the section in the 9th ed right now. Basically for multipass exchangers, the pass partition plate rests on the channel cover on one side and on the tubesheet on the other side...

jt, Yes, I should have provided the section of the code, The Savg is actually SPS now. Which in some cases be higher. Refer to section 5.5.6.1.d of ASME Sec. VIII Div. 2 2007 Ed 09 Addenda, which defines SPS and shows that you have take average of the vales from the highest and lowest...

Kapil, In your analysis are you classifying the weight loads as sustained, thermal loads as thermal Expansion (resulting in secondary stresses) and seismic loads in occasional categories. Then, you can take advantage of the limits from Div.2 for various stress combinations. btw, the limit...

Dear TDS4 how do you accurately know the stiffness of the restraints, bends, reducers, T's etc. How can you accurately know the local yielding that might occur at these locations. How can you accurately account for the manufacturing tolerances. etc. I agree with EngAddict that this will make...