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I am interested in using an o-ring flush mount pressure sensor such as one of the items shown in the link below: http://www.meas-spec.com/pressure-sensors/media-isolated-pressure-components/media-isolated-mv-output-pressure-sensors.aspx Does anyone have a description or example of how they...

Thank you for the input. Additional details of the application are an operation temperature of 20 to 200 Deg. F. The sleeve to be pressed into the bore is intended to retain sealing components. Therefore, the sleeve needs to be replaceable. Installation would be lubricated.

I have a cast iron bore (4.5" diam.) into which I would like to press fit a sleeve. I am calculating the contact pressure for such a fit and trying to tailor my sleeve thickness and sleeve material selection. Can anyone recommend a good sleeve material? I would like the fit to be a relatively...

I have tubing made from PFA thermoplastic (ASTM D3307 Type II) for which I would like to obtain a hydrostatic design stress (allowable stress). Ideally I would like this value to be based on ASTM D2837. Does anyone know of a place where this type of information is published? Completing a test...

The Pressure Equipment Directive (PED) requires that certificates of specific product control are required for "Main Pressure-Bearing Parts" in categories above I. This requirement is confusing to me for products such as a valve, where you have several components that are pressure bound. Are...

NACE MR0175 rules are given for the qualification of a PQR for hardness requirements. Different hardness survey profiles are given for the qualification of groove and fillet welds. In ASME IX a PQR for a groove qualifies fillets for the purposes of welding code. Do hardness profiles on...

Does the recommended interpass temperature of 350F come from AWS? I have heard this temperature given other places, but wondered where it is defined.

When welding 316L stainless, are there any code rules (ASME or AWS) that specify the heat input limits/control? Is there a reason to be concerned about heat input for 316L stainless? Also, is there any real heat affected zone for welded 316L stainless? My understanding is that 316L is...

The ASME B16.5 standard appears to allow the use of cast or forged material for the construction of flanges. There does not appear to be a difference between pressure ratings for 316 stainless cast or forged material. I have only ever seen forged material supplied for 316 stainless flanges...

If I design a pressure bound bolted joint with metal to metal contact and an o-ring sealing method, what bolt preload can be used per ASME B31.3 / VIII Div. 1 Code? This joint would fall outside the configuration types of Appendix Y (Flanges with metal to metal contact). Appendix Y tells you...

When designing a flange to ASME VIII Appendix 2 and using a spiral wound gasket containing an outer and inner ring in combination with a raised face, what is the proper seating width "N" to use for the determination of b? It seems like you should use only the width of the actual spiral wound...

What is typical for the rate of pressure rise on a burst test conducted to ASME VIII Div 1? The code only states that the pressure should be slowly increased to rupture. Are there other codes or industry guidelines that specify the pressure increase increments and hold times, or a general rate...

What are the engineering reasons behind the hub slope limitations given in ASME VIII, Div 1, Appendix 2 Fig. 2-4 Sketch 6 for integral flanges? Is it due to stress concentrations? Also, is sketch 5 intended to be for an integrally cast flange, where as sketch 6 is for a welded flange? I am...

I am beginning to research UL 61010-1. Is there a legislative rule that requires a specific product to conform with this standard in the USA? How about in Europe. Is there a directive that requires conformance to EN 61010-1? Thanks.

In Europe, pressure safety is addressed on a national level by the Pressure Equipment Directive (PED). In Canada, pressure safety is addressed on a national level by the B51 code and CRN registration. What rules or codes exist for the USA? Are there national or local rules? Obviously the...

I am in the (very) early stages of investigating the options for returning to school for graduate study in the field of mechanical engineering. My undergraduate degree is also in mechanical engineering, which was obtained about 5 years ago. I would like more technical training in my...

I am wondering out of curiosity what effect an annealing process would have on a yielded tensile specimen. If you loaded a tensile specimen to the point of necking and then subjected this to annealing process, what type of state would the material return to? How about if the tensile specimen...

If you have a given material grade, for example 316 or 304 stainless, is it typical to expect the allowable stresses in the B&PVC to vary depending on the product form you select (bar, pipe, plate, forging)? 316 is probably a bad example because I am pretty sure the allowable stresses are the...

What type of processing is typical for welding 316L Stainless that is required to be in compliance with NACE MR0175? Is post weld heat treatment required or recommended? Does the joint construction and/or weld size matter?

To what extent are residual stresses expected to be present in welded 316L stainless steel? Are these stresses different for a fillet weld for example and a full penetration pipe butt weld? I see that post weld heat treatment is typically not used for welded 316L, but would there be a benefit...