Hello everyone, 20 year ME/PM background in oil/gas where I've been only exposed to a couple canned project management tools, homemade excel based scheduling tools and failed attempts at MS project. We have a robust erp system with accurate labor hour buckets for manufacturing and currently...
I was assuming one continuous circular weld but I agree it would be very approximate without calculating the ID and OD of the weld at the pipe cap.
Are you using roark for the shear thru plate calculation at the pipe OD?
interesting perspective and i do remember using that that principle of temp fixtures on a different application. Thanks for the reminder Mike! after I make the "good practice" calculation, I will verify with the AI.
Weld Size:
Throat Size: x Cos 45deg = .25"thk X (0.707) = 0.177"
Effective...
Hey everyone,
My customer is requesting a specific Hydrotest Nozzle Pipe with PipeCap and reinforcement plate. They are specifying welding and material thickness inwhich I need to verify since this is an ASME pressure vessel. see below link for a visual.
Link
Nozzle Pipe Cap: SA234, 6" XH...
I'm using API 661 7th edition which is the 2013. And I agree...just curious why or what the intent was in targeting low ally Cr-Mo original. The carbon steel I get....they want the bottom barrel, low to no spec jobs tested to something cheap that gives a "base" line for metal properties.
I am hoping to gain alittle more on the intent of the Brinell hardness testing for what they classify as "chromium steels." I assume someone is making very specialized Cr steel pressure vessels, but why just those 3 types? It seems like the intent is check tensile/yield strength of the plate...
TGS4- when you mention having customers stop using arbitrary nozzle load tables, which i agree, but once this gets implemented into 2019, how are you expecting OEMs to handle API Nozzle Load tables. Take full exception or just beef up the coolers? Its not uncommon for us to sell 20-40 lease...
Hey molten. I think you may have misunderstood. The request is inlet and outlet process nozzles to be 150# but vents and drains to be 300#. Typically I have always kept flange ratings the same, so I would update all to 300#
TGS4, I agree, only between the AI and Manufacturer as they are the jurisdiction.
but i have question on your "TGS4 (Mechanical)25 Apr 19 23:01
SnTMan - only with respect to contractual requirements. That is not a Code requirement. Unfortunately."
What are you saying is not a code...
I've always been taught that you want to keep all nozzle connections on a pressure vessel the same for safety and engineering 101 principles. I currently have a customer that wants all nozzles 1-2" to be 300#, and all 4-8" to be 150# when specified as minimum pressure,say 50psi. I always...
Hey everyone, I just ordered a hard print that will be here in a week or two but can someone tell me the requirements listed by this Annex J? I am currently trying to satisfy a pressure vessel for SK CRN. Looks to be a (new)requirement I was not aware of under the Special Circumstances...
As a fabricator for a customer that is not going to provide gasket/piping forces/etc till the units are shipped(some even by packages that have no end user yet and are for rental fleets), how does API's nozzle load tables play into affect? Is the idea that we should no longer quote arbitrary API...
LOL, I had semi assumed this but I also thought maybe I could just use the mean inner and outer diameter of the gasket dimensions.... What else have I not considered ;)
Marty007 hit it on the nail with 1 and 2. Also with replacement coil sections. As an engr for heat exchanger appendix 13 plate box headers,this is exactly how 90% of our customer purchase our pressure vessels. It will take extreme education to get all the competitor bids to be apples to apples...
Hello all! I found another topic with vagueness that I want to provide calculations for, with the purpose of standardizing routine torque checks... SA105 Shoulder Plugs for Boxed pressure vessels, more precisely, heat exchangers. A very grey area as far as where original calculations came from...
Hey everyone. I have an old 80's heat exchanger I am reviewing and it was ASME nameplated for -60F MDMT. This is alittle colder than I have dealt with so I am seeking advice. The box's plate/nozzle pipe/flanges have been impact tested per UG-84 to -60F MDMT but I am curious about the...
Thanks David. This matches my logic...one additional item I found was under asme sec ii for art under table 1, it list a500 as an appurtenant material to a36. Therefore, yes it would need to meet 15ft/lb under 1inch thick unless exempt per ucs-6 or ug-20f which states p1 material under 1/2in...
Ironic: Although material wise there is some cost increase, welding and manufacturing will be dramatically increased for a SA-516 plate box. Welding, handling, how its constructed. RMT can be drilled and tapped in one pass in 20-40ft sticks then cut to the proper length, end plates welded on...
