BigInch: If we had a single relief valve I would totally agree. With Sect VIII UG-134 in mind I would still agree for almost every case. But 31.1 is not clear on this and that is the code being used for the design.
Also, in this piping system the possibility to get close to MAWP is only during...
This has been an interesting discussion. Thanks to all who contributed.
Since my original post, I determined that the highest setting on the last (6th) PSV is <5% above the B31.1 piping MAWP which is within Section VIII's UG-134. (I was originally told 10% over the MAWP.) I am feeling better...
I understand that B31.3 permits temporary pressure excursions over the MAWP. And I believe B31.1 allows this too. But I am still having a problem with all but 1 of the 6 PSV's being set above the design pressure of the B31.1 piping.
Thanks whammett. Me too - never.
You are correct, it does sound conflicting the way I presented it. I am basically saying that once past the first valve lift, the piping pressure will continue to rise above the design pressure until the next set pressure is reached. At this point this is almost...
On a non-fired boiler steam line... has anyone ever seen the design pressure of B31.1 piping being LOWER than its relief valve setting?
There are multiple relief valves in the line, each at an incremental pressure than the previous. The first valve will lift at the design pressure of the pipe...
We are purchasing a hydrogen cooled generator. Is there a standard test (IEEE?) for shop testing the gas flow through the generator? I have heard of a ventilation test or blower surge test mentioned before.
Thanks!
Our transportation dept has informed me a Section VIII vessel we have on order might be too large to ship in one piece. The final weld (for pressure boundary) would have to be completed in the field. The weld exam, hydro, and application of the U stamp would have to be done in the field as well...
Is thermal leakage (short circuiting) across the longitudinal baffle seal a big concern in TEMA BFU exchangers? What about restoring the seal after the shell is pulled?
I cannot change to a different HX type - the design is fixed. Thanks.
Mechya - If the pump suction is vertical use the concentric reducer.
Another thing I do remember with double suction pumps is if you have an elbow on the suction side close to the pump, you should arrange the elbow so the flow does not cause an imabalance on the impeller.
This is not easy to...
I did not read all the posts word-for-word and I am not commenting on the merits of eccentric reducers...
But when they are recommended (right, wrong, or otherwise), from what I recall, the position of the flat side (top or bottom) depends on whether you have a suction lift or an elevated supply.
Thanks Montemayer. I should have made it clearer. The order as currently designed (but not built) is:
waste tank --> diaphragm pump --> filters --> demin
We want to put the centrifugal pump between the filters and demins.
We are designing a system that uses an air operated double diaphragm pump for pumping wastewater through some filters and a demineralizer. The problem is the diaphragm pump does not have enough output pressure to pump all the way through the demineralizer at the required flow. (The plant air...
Is the 2/3 rule ASME VIII or API? I don't see anything in ASME about 2/3, but I just started looking.
And yes, there are isolation valves on the shell side system.
Thanks.
