If you're just doing relatively simple stuff, making a quick calculator based off Crane TP #410 or using any of the online calculators available would be your cheapest bet.
Previously you may have had something like:
Case 1 = Operating Case (support lift offs but no allowable stresses)
Case 2 = Sustained Case (as-installed, no lift offs)
Case 3 = Expansion Case (total stress range, just used for allowable stresses, no lift offs)
Without careful review of Case 1 you...
David,
So in Caesar II that's handled via their "alternate sustained" cases - these are basically sustained stress checks based on your operating case so if you have support lift off scenario, you'll see the increase in sustained stresses in those cases.
The previous general discussion of...
The more information we get the more I'm skeptical of the 1200C limit too. I suspect that's a worst case for the heater, but due to the BTUs the heater lists there's no way they're getting up to that temperature. That'll be a fun conversation with the client.
Thanks for the information Ed. If...
Basically the only reason its still a checkbox/toggle is some clients/industries have very old specifications that specify you must use the "conservative" sustained stress in the allowable stress calculation.
Generally, as computing power has come a long way, industries/clients have allowed you...
They don't have any capacity (in terms of ASME relief valve sizing) since they're not real relief valves. Flow thru the valve increases as dP across the valve rises.
Yeah it's an interesting case and so far I don't see any materials that jump out as long term viable options to me, but we'll be getting a metallurgist report for recommendations and then I assume I'll have to create the material in Caesar to run it. I'm definitely expecting low allowables since...
Does anyone have any experience with very high temperature piping systems, such as 2,200F (1200C) hot? It looks like ASTM B407 and HR-120 alloy may be suitable, but this is pretty far above anything I've done before. ASME B31.3 allowable stress tables seem to only goes up to 1,650F and say...
Yeah in my world (general industrial consulting) our contracts and scopes aren't super technical in terms of locking down specific variables and inputs like that, so we normally have to establish those kinds of parameters after we get the job.
I mean ultimately it's up to you if you want to sue him for stealing your plans (as he plainly did). You seem very hesitant/reluctant to sue, probably because courts and lawyers are a nightmare, so if you've resolved it to your satisfaction and don't want any money that's your prerogative, but...
XL, in my world (general heavy industry consulting), we typically discuss this overtly with the client on projects. Like okay we understand the equipment and piping is rated for 500F but it operates at 300F and would need serious modifications to get there - do we run the analysis at a...
Protecting a nitrogen system, if you're using B31, still requires an ASME relief device. I'm sure the regulators/reliefs on nitrogen and propane bottles are different, but if its a piping or tubing system I don't understand how it qualifies.
Someone here may be able to explain better, but that Swagelok relief valve seems similar to other chemical feed type relief valves I've seen that aren't actually ASME rated devices. They're just spring adjustable valves basically.
Assuming this is a B31 system how does that type of device...
Obviously not a whole building, but for my garage the only thing my county cared about was the PE stamped truss drawing. The rest of my garage plans were not stamped or required to be stamped by them.
Here's the example from the book - 12" CS pipe at 350 degrees with a good sized vertical riser. The first pass comes up with all spring hangers (8 locations) because every location is moving vertically to some degree.
Using this equation that takes the modulus of elasticity, pipe size, and...
Assuming you're not spreading some crazy tinfoil hat theory, I don't think there's any real concerns as long as its clear you're not actually involved like SWC says. Easiest way to avoid it is to not include your qualifications if you're just spitballing like everyone else
I'd agree - if you somehow knew the system was misaligned you need to include it in the stress analysis. However if it's a random mid point weld where the stress is maybe 15% allowables, your SIF of 1.9 makes it all of 28.5% allowable.
Beam theory has its limitations but by and large works. If...
In my Caesar II training they covered a similar kind of example of where if you follow the rules to absolute letter, on almost any system w/ temps you may come out to all hangers because everythings moving a little bit. They had an equation on "distance to first rigid" based off the expected...
Ideally the pipe stress should be done at that maximum realistic temperature for the system. So if the operating temperature may be 60C but real upset temps are 150C and the specs/materials of construction are based on a design temp of 250C. In that situation, unless the system could be modified...
