It will depend on your material of construction, the hydrogen partial pressure and temperature.
In most cases those overlays are to provide a barrier between the hydrogen and the steel to preven high temperature hydrogen attack. You can reference the Nelson curves in API 941.
If it is actually water seeping out, there are wraps like A+ that can be verified via ASME PCC-2 that an experienced leak sealing company can install for you.
Of course these tend to require some degree of surface preparation and as LI says, you can run the risk of making the leak worse.
In...
From the C2 Quick Reference under the What's New section
Once you have V13 and later, it appears it would use B31J. Before that it would be via App D and the B31J tool if installed.
Are you able to extract a sample of the material for testing purposes or able to perform PMI on the material ?
Otherwise, you may need to be very conservative in what you material you are assuming as it is essentially a best guess.
If the name plate is still on it, you may be able to get a...
The formula stated in the code of t = PD/2(SE+PY) is used assuming the pipe is thin such that t < D/6.
If you have a situation where t>= D/6 or P/SE >0.385 then you won't be able to use the above equation as the basis is not a thin pipe anymore.
At that point, you would be likely needing to do...
I can't rememeber the exact paragraph in B31.3, but those integrally reinforced branch welded fittings are typically expempted from the calculatons once they adhere to some additional criteria.
If you wish to change the type, then you'd need to redo the branch reinforcement calculations and...
Do you have any previous inspection history for the valves ?
Depending on the service and operational history you may find that those in clean service may not require frequency internal inspection and recertification. However, those in dirty service may.
Some valves such as those on boilers...
Hello Gears6580,
Are you referring to welding a flat plate onto the tubesheet where the tube is being extracted ? You can consider putting a tapered plug of suitable dimensions as that may be easier depending on the configuration. UG-34 would generally be the way to go once you select the...
Do you have the details on how the external engineer modelled the anchor on the condenser ?
Are the loads on the rest of the piping comparable or do you have case of lift-off occurring and thus causing more loads to be transferred towards the anchor ?
Are the allowable loads on the condenser...
One thing you can do with these types of spreadsheets, is to manually calculate one of the thickenesses. If your answers match (within reason due to rounding), then you know your formulas are correct.
When I had to do these types of repeated excel calculations with more complicated formulas...
I am not sure there is a specific way to do that on a shell.
AFAIK, the force/moments are calculated based on WRC107/537 which are really for the local effects of the attachment on the nozzle/shell. You may need to reach out to Hexagon for further advice.
Your best bet may be to improve the metallurgy.
You can also look into increasing the pipe thickness however that can only get you so far.
Did your stress model pass the EXP load case ?
At one of the facilities that I have worked at, there were 304H SS piping designed to 1200 degF. However...
@Abhijeet242
These are quite large pipe sizes.
What flow rate and DP are you looking at? Depening on these, you will need stellit trims as georgeverghese suggested but also you can possibly run into steam erosion problems in the piping itself. Noise can also be a factor as well (maybe you...
The first thing to do is to properly define the problem to ensure that the correct engineering solution is being applied - or at the very least, to understand the root causes of the issue(s) being faced. If de-rating is necessary, you should have a comprehensive assessment with your process...
You'd have too many unknowns and like EdStainless suggests, unless you have some specific way to calibrate against a known standard, you're mostly going to be guessing.
Depending on the process fluid and temperature, wall profile radiography might give some useful results.
@deepu78
The design temperature is most likely based on a factor of the maximum operating temperature of the system. The piping specification would thus likely be based on components with thicknesses/materials to withstand at least 450 degC.
I would think that if you install something that is...
There are some codes that specify that the hot modulus Eh can be used for equipment nozzle loads given that Ec may be too conservative. So it depends on what you are doing and how sensitive your results at a particular location.
With respect to a full circumferential ring, wouldn't the analysis to determine the thickness of the ring end up including the eccentricity check i.e. bending resulting in the same thickness of a fillet patch ?
