We have forgings supplied in accordance with ASME SA350-LF2 Class 1 in the Normalized condition (P1 Group 2). The hardness came in between 130 and 140 HBN, which is too soft for our application (galling issues). We segregated a portion of the material to which we applied a quench and temper...
We are designing an assembly subject to internal pressure that will use a circular flat head that is retaining mechanically at the outer diameter (Fig UG-34(m)). The head must meet Sec VIII Div 1. Is the Equation 't = d*sqrt(CP/SE)' only applicable to the plate center where maximum bending...
We are manufacturing a vessel/pipe fitting from triple certified material, i.e. SA105 / SA350-LF2 Class 1 / ASTM A694 Grade F46. Our Regulatory Authority (R.A.) has stated that they will register the fitting in the Normalized only condition. Our Material Supplier says to consistently achieve...
I am writing an Excel 2010 VBA code that calls Solver and I need to tell Solver to uncheck the "Make Unconstrained Variables Non-Negative" box. The default is "True", ie. the box is checked. When I uncheck the box and run my code, and ask Solver to return the state of the box...
Does anyone have a copy of ASME Section II Part D prior to the change in the Allowable Stress Safety Factor from 4.0 to 3.5?
S(Allowable) = S(Tensile)/4.0
I need to know, from Table 1-100 the safety factor used for establishing the allowable stress using YIELD STRENGTH.
In 2007E...
We are welding A516-70 plate for a vessel that will be exposed to sour service. Are we required to PWHT, even though the hardness tests on the weld procedure (WPS) used for construction does not exceed 22HRC in the as-welded condition?
Is there anything in ASME Section VIII Div 1 that covers Thread-o-let fittings? Can they be used at the MSS SP-97 rating of CL3000 and CL6000 without analysis (MSS SP-97 is the design Standard for Thread-o-let fittings, but isn't listed in UG-44)?
The various Standards associated with weld...
We wish to construct a press that will allow us to cold bend A36 solid round bar 90 degrees for use in davit arms. In sizing the press, we need to know how large of a hydraulic ram to use. There are a lot of tube and sheet bending formulas out there,but little on solid rounds. Any suggestions...
I have a draft document consisting of two Worksheets: one with drawing views set at 1:2 scale and a second with drawing views set at 1:4 scale. I wish to place a callout in the Title Block at will display the correct scale automatically when I populate the drawing with the part. How do I get...
I am modelling a vessel head consisting of a 2:1 ellipisoidal head. I need to place a thru-hole at the top of the crown.
I do not wish to use a Parallel Plane that is offset a discrete distance from the knuckle/flange point of tangency because if I later change the size of the Head, the offset...
I am trying to locate a copy of the following paper:
"Summary of Design Equations for Clamp Type Connectors" prepared for the Association of Wellhead Equipment Manufacturers prepared by Harry J. Sweet and Associates back in 1975.
This paper is the basis for the API Publication "Bending Moment...
We are designing pig receivers utilizing wrought butt-weld fittings (Reducing Tees manufactured to ASME B16.9). Would anyone know where I can find pressure/temperature ratings or burst pressure for these fittings? They are not found in B16.9.
Suppose I need to design an spherically dished vessel head (ASME Appendix 1 Section 1-6) to operate in an ASNI 1500 enviroment (3705 psig). ASME Sec VIII Div 1 rules are valid only to 3000 psig (Section U-1(d)). How do I adapt the design calculations to account for the higher pressure and...
What percentage of the values for Allowable Stress in Tension (ASME Sec II Part D) is the Allowable Shear Stress for the same material (ambient temperature)? Some souces state 0.7 of allowable tensile stress, others 0.5, etc. I am not talking about welds, strictly base material, i.e. SA516-70...
If I have a flat plate blanking off the end of a vessel and machined it so the inside surface is concave to pressure and the outside remains flat, do I still need to use the Sec VIII rules governing flat plates to determine minimum wall thickness or can I now use other rules, such as those for...
How is the MAWP of ASME B16.5 flanges determined? We have NPS6 Sch 40 and Sch 80 flanges which sources say are both rated for 1480 psig, but common sense says the Sch 40 should be rated lower. We have fittings manufactured from SA350-LF2 with Sch 40 bevels which ASME calcs says we can only...
I tried starting this thread in the Gear Forum with no response so I will try this one... I am design a hatch the locks with a mechanism similar to a bank vault, i.e. having a centrally located hand wheel which when turned advances a series of radial pins outward. I am not sure how the gear...
I think this would be the best forum to ask this... I am design a hatch the locks with a mechanism similar to a bank vault, i.e. having a centrally located hand wheel which when turned advances a series of radial pins outward. I am not sure how the gear arrangement should be designed. If...
This may be simplistic but here it goes anyway... I am designing a screw jack and need to have some idea of the typical amount of force a typical human (male 170 lbs) can comfortably exert on a wrench to turn a bolt. By comfortably, I mean without bouncing or sharply jerking the wrench. This...
