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Hi, I'd like to know if it is necessary/practical to use ASME PCC-2 Mandatory Appendix II - Stored Energy Calculations for Pneumatic Pressure Test for pneumatic leak testing of equipment that has already been hydrotested in the shop. Background: Loop Reactor with flanged/gasketed joints. MAWP...

How does one go about choosing a minimum CVN impact value? I know this is a broad question, but I'm trying to determine the temperature range at which a torsional fracture would change from a ductile failure due to max shear stress to a brittle failure due to max tensile stress. BTW, I was able...

metengr, Your link is not working for me.

Thanks. The table illustrates that the H1025 condition will have a higher impact strength than 17-4PH treated at 800F, but at what point is the material considered brittle?

Hi, I'd like to know an approximate DBTT for 17-4PH in the H1025 condition. I've found some limited CVN data (Link) but this doesn't give a clear DBTT. Is there a specific impact energy that can be considered a minimum for ductile behavior?

Thanks EdStainless

TD2K, I wasn't concerned about galvanic corrosion in the all carbon steel construction, but rather, the use of sacrificial anodes to help it survive normal pitting corrosion from water. EdStainless, It makes sense that CS isn't the correct material of construction, but what is the...

I generally see sacrificial anodes used in exchangers to protect against galvanic corrosion between two dissimilar metals. Are they ever used in 100% C/S construction? If not, why not? Is upgrading the metallurgy generally a better long term solution? The galvanic cell created to corrode the...

The point of this project is to get rid of threaded fittings on a two stage recip compressor's pulsation bottles . These plugs will be seal welded. I don't see a big issue with seal welding the plugs since there isn't a moment arm to cause a lot of stress on the weld/threads. Seal welding would...

Thanks bimr. Do you have a link to Art Montemayor's thread? We have threadolets installed already (currently plugged), and want to use them with a nipple and flange for a flanged thermowell connection. Since it is hydrocarbon service, typical threaded connections are not allowed. This is why we...

Hi, Can someone provide info on advantages of welding a nipple into a sockolet vs backwelding a threaded nipple in a threadolet? I read on another forum that cracking can occur in the backweld of a threadolet due to thermal expansion of the nipple during welding. This would not occur in a...