Dear All,
Can anyone inform me on available level sensing devices in the market, acceptable to TDP-1 that can be used on drain pots at high temperature&pressure applications .
I understand float type level switches may not work for 1800 psig, 1050 deg F high pressure steam for example. Is...
Does anybody have HEI standard for steam surface condensers?
What does it say about sizing criteria for PSV+rupture disk on the condenser?
Any special requirements against abnormal operation of turbine bypass stations?
Dear all,
I would like to get your comments to the following:
ASME B31.1 mandates that downstream of a pressure reducing valve shall be protected either by i)designing the low pressure side same as high pressure side ii)or by installing a pressure relief valve with sufficient capacity.
Now...
Dear All,
I would appreciate if anyone can shed some light on the following issue:
We are designing boiler external piping and non-boiler external piping per ASME B31.1 code. In this code there is reference to ASME B16.34 as the only applicable valve standard. However in the market most valve...
Artisi,
The first pump's (condensate transfer) capacity is 130000 lb/hr with a head of 70 feet. Boiler feed pump which is downstream of the first pump has a same flow capacity with much higher head, namely 1500 psig. Operating temperature is bet. 120-130 deg F. Two pumps are separated by a...
I have done some homework by surfing on internet. There is a device called suction stabilizer used mostly in positive displacement pumps (not centrifugal) Also acceleration head calculation is mentioned on the net. But all of these do not seem to be 100% relevant to my original question. With a...
Dear All,
Water temperature is between 120-140 deg F. The piping between two pumps is around 200 ft. The condensate pump will keep the line pressurized at approximately 30 psig.
The more I think about it, the more I believe that a water hammer is more of a concern than the cavitation.
What...
Hi all,
Can anyone point me in the right direction as to how I should approach below problem I am facing:
I am designing a pumping system where condensate transfer pump discharges water directly to boiler feedwater pump in a power plant with no tank in between. (My condenser is deaerating...
Dear Latexman
Just to summarize the data in example given in B31.1
set pressure of PSV =910 psig
Calculated pressure at discharge elbow exit =118 psia
Calculated vent stack exit pressure =51.4 psia
In this example PSV discharge pipe is free to elongate inside a larger vent stack. (Drip pan...
Thanks Latexman,
Some Silencer vendors have diffuser in their design which is a pipe with several holes as first stage of noise attenuation. I suspect the flow can be choked right there and PSV capacity may be impacted, if not designed carefully.
By reading your post, I had trouble...
Dear All,
The more I think about my original question, the more I come to believe that silencer can be treated as flow resistance in a subsonic flow, since exit velocity at silencer should be low.
Here is my methodology for a spreadsheet solution. (I would like to see what Experts like...
Dear I2I,
First, boiler PSV exhaust piping does not have to be open discharge system. There are a lot of projects where outlet piping is routed to roof without open joint-umbrella drip pan design. (though flexibility should be checked carefully)
Secondly if you check the example mentioned in...
Dear All,
I am in the process of developing a spreadsheet and would appreciate help on the following topic:
In case of a high pressure safety valve, say boiler superheater PSV, the flow is choked at vent exit as well as at PSV nozzle opening just like in the example given in Nonmandatory...
Dear CodeJackal
Thanks for the reply. My question is if there is a specific technical reason as to why API 5L is not allowed in boiler external piping. Is it just a matter of boiler code not recognizing material from another standard, namely API.
Thanks
