Hello,
Thank you for the explanations given in the thread: thread124-196619.
However, Doug and BigInch should clarify a conflicting statement concerning that the heat exhanger cannot be regarded as doing the work of a suction stabilizer. According to BigInch, the heat exchanger breaks the...
Hello,
Please can you share with me the potential danger (or otherwise) of operating a centrifugal compressor plant with the anti-surge valve control system deactivated but running with the anti-surge valve opened permanently at 30% open position.
We have a situation in our plant (3...
Hello,
We are considering a wet gas screw compressor for vapour recovery application. The gas is wet, water saturated and a heavy gas. Could anybody advise from the experience in their plant where they have this wet screw compressor for similar service the manufacturer that they will recommend...
Hello,
Does centrifugal compressor behaves similar to centrifugal pump as it realtes system resistance? The question is if a valve on the outlet line of a centrifugal compressor is closed, will the new operating point move to the left towards surge on the performance curve? Pls help explain.
Hello,
Can someone please confirm to me that the discharge from a gas reciprocating compressor will be constant irrespective of the inlet volume flow. If the flow into a reciprocating compressor drops to 10 percent, will the discharge pressure remain the same as when the design inlet flow is...
Guys,
i am aware that labyrinth seals are used for minimizing gas leakages.
Could anybody confirm to me the following:
Is interstage labyrinth seals in multistage centrifugal compressor used for limiting axial thrust across each impellers in addition to minimizing gas leakage to the...
Guys,
I am aware that pig traps are designed based on ANSI B31.4 for pure liquid service and ANSI B31.8 for gas service. But I came across a vendor manual that informs that the pig trap was constructed according to ASME VIII, Vessel code. Has anyone encountered this? If yes, what are the...
We have a centrifugal pump in our facility using flush Plan 11. Liquid is taken from the pump discharge and connected through an orifice into the mechanical seal at the top flush connection. The Flush (F) connection location is at 0 degrees while the Drain (D) connection location is at 180...
Hello guys,
Any time I read an article or text book on determining the measurement to take when referring to static head I get confused.
The text book definition is that it is the measurement from the free liquid surface in the vessel to the pump inlet eye (centre line).
My own opinion is...
Firstly, I must state that I understand the calculation process of sizing relief valves on a fire case and non-fire case conditions.
My question is trying to understand the case to select, i.e fire or non fire case
While I was reviewing the relief valve used for protecting a vessel installed...
Dear All,
I am a bit confused with the solution of the example given in API-520, PArt-1-Sizing and Selection (Sizing, Slecetion and Installation of Pressure -Relieving Devices in refineries.
In Example 4.3.3.2, page 31 (6th Edition, March 1993),
The problem I am having is that a total back...
I searched for this thread on discussion on this subject, but I could not find any.
Does anybody out there have experience in estimating line pack in gas line.
Line pack is the amount of gas that will be available in a pipeline at any given time.
I am specifically interested in the...
I am reading on heat exchangers to prepare me for future challenges.
One of the text books I am reading define U as barrier resistance or overall heat transfer coefficient.
I am trying to make a sense of U (Overall Heat transfer Coefficient) if I come across "U" typical data for...
Could somebody tell the usefullness of TDH.
I know TDH is Total discharge head minus total suction head (plus if it is suction lift).
My feeling is that if you calculate the TDH then you can determine the flow rate from the pump curve.
Am I right?
If not can somebody enlighten me.
Guys,
I was reviewing a set of P & Id (PEFS) and I discovered that a design pressure of 100 psig was recommended for the vent scrubber which vents to the atmosphere.
But I found out that a relief valve which has a set pressure of 1000 psig reliefs to this vent scrubber. It is a relief valve...
Could somebody help with understanding pump curve vs the system performance curve!
How do I draw the system perf. curve.? Is the data used for drawing the system performance curve (NOT pump curve which is from the pump vendor) derived using a simple pipe (friction) flow calculation? That is for...
