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Thanks for your response. To answer your questions, this is a manual weld. The parts are held together with threads and torqued to a set value, so there are no tack welds needed. Also, each part is made with a square edge to mate cleanly, so no filler metal is added in the weld. Thanks again...

I have a GTAW butt weld at the joint between two cylindrical SST peices (diameter approx 3/4"). Of 11 units tested, one failed a static pressure test with a crack forming in the weld. The location of the failure point is interesting to me as the crack is positioned immediately beyond the end...

I am using a 10-32 1/4" set screw with a nylon patch (for its "self-locking" properties) to hold a wire in place. This wire is non-moving, but the entire assembly can be subject to vibration. Value, direction, etc of possible vibration is unknown. We are concerned about the set screw loosening...

Does anyone know where to find fatigue values for 316SS? This seems like it would be easily available, and easily accessible. But we have been unable to locate such information. We've look at ASTM, and ASME standards. We've also contacted our material vendors for the info, but they either...

I need a material suggestion for an adhesive to use in a cemented joint for an explosion proof enclosure. The material will go between a 316SS body and a ceramic transducer. We need the material to be fairly flexible so as not to put stress on the transducer and alter its output (especially at...

I need a material suggestion for an adhesive to use in a cemented joint for an explosion proof enclosure. The material will go between a 316SS body and a ceramic transducer. We need the material to be fairly flexible so as not to put stress on the transducer and alter its output (especially at...

Does anyone know where I can find a compatibility chart for Al2O3 ceramic that will show compatibility with dry chlorine gas?

Thanks for the idea - it was a good one!! But sadly, I already tried that. The agency won't accept anything other than a cert from the manufacturer with the yield rating, or a test report from a certified lab.

Does anyone know a good supplier where I can purchase machine screws with a certificate giving the yield stress rating? We are working on an ATEX listing and the agency is requesting the yield stress rating for a screw we are using. The cert we recieved from our vendor only gives the tensile...

We are trying to calculate the vapor pressure of an Ethylene Gylcol/Water mixture. We are using pure ethylene glycol (no additives), and our mixture is 60% EG and 40% H2O. The Critical Pressure and Temperature of EG is: Pressure - 1116.8 psia Temperature - 733.3°F The Critical Pressure and...

Where in B31.3 does it show how to calculate the allowable stresses for unlisted materials? I have found paragraph 302.3.2 (f) that states tensile at temperature is found by multiplying th average expected tensile at temperature (where to find this, make it up?) by the ratio of St (if it is...

We are trying to get a level control product a CRN (canadian registration number) through TSSA. The unit is made from a slug of SS, 2in in diameter by 5in length. It has NPT threads on the outside to engage in the process, and a 1 in hole bored half way in down the center axis for a float and...

We are trying to get a level control product a CRN (canadian registration number) through TSSA. The unit is made from a slug of SS, 2in in diameter by 5in length. It has NPT threads on the outside to engage in the process, and a 1 in hole bored half way in down the center axis for a float and...

This is a welded diaphragm, and our pass/fail value for performing helium leak checks is 1E-07 sccs. We perform helium leak check on all units before any testing begins - no leaks were detected. After aging the units and observing the decrease in pressure, we re-checked the helium leak - still...

We did helium leak checks on a few samples - but found no leak. Our only idea was that the gas was permeating at the elevated temperature, but showed no leak at room temperature.

Does anyone know where I can find information on the properties of SS sheet as it pertains to permeation at elevated temperatures? We have .001" 316L stainless steel sheet used as a pressure diaphragm with approximately 200 psi of Nitrogen behind it. We have run numerous units though aging...