What is a method for sizing a surge vessel for compressible fluids?
What is a method for sizing a surge vessel for compressible fluids?
(OP)
What is a method for sizing a surge vessel for compressible fluids? That is, how can a pulsation dampener, surge drum, suction or discharge bottle or any other drum be sized to maintain steady flow of a compressible fluid?
Our process requires X SCFM flow of gas at temperature T and pressure P. Due to the actual conditions of the process, X flow rate varies by ~25% and P by ~10%. The downstream conditions of the gas require steady flow rate.
Actual volume can be calculated by converting from SCFM compensating for compressiblity, temperature and pressure. Does the procedure for calculating surge volume require calculating a volume for the excess gas flow? That is, the actual flow for normal flow conditions is NC ACFM. The actual flow for conditions 1 and 2 is C1 and C2, respectively. Would the surge volume be calculated as
A. SV = C2 - C1;
B. SV = maximum ( absolute(C2-NC), absolute(C1-NC) ); or
C. SV = absolute( maximum(C1, C2) - NC )?
Our process requires X SCFM flow of gas at temperature T and pressure P. Due to the actual conditions of the process, X flow rate varies by ~25% and P by ~10%. The downstream conditions of the gas require steady flow rate.
Actual volume can be calculated by converting from SCFM compensating for compressiblity, temperature and pressure. Does the procedure for calculating surge volume require calculating a volume for the excess gas flow? That is, the actual flow for normal flow conditions is NC ACFM. The actual flow for conditions 1 and 2 is C1 and C2, respectively. Would the surge volume be calculated as
A. SV = C2 - C1;
B. SV = maximum ( absolute(C2-NC), absolute(C1-NC) ); or
C. SV = absolute( maximum(C1, C2) - NC )?





RE: What is a method for sizing a surge vessel for compressible fluids?
Our process has a variable flow rate and downstream the requirements are that the flow rate is steady. We plan on installing an empty vessel to provide surge volume with a flow control valve on the discharge.
RE: What is a method for sizing a surge vessel for compressible fluids?
Being no expert on the subject I can only direct you to Ludwig's Applied process design for chemical and petrochemical plants Volume 3, GULF; Chapter 13: Compressor surge drums.
It contains examples.
Hoping it will be of help.
RE: What is a method for sizing a surge vessel for compressible fluids?
BTW, visiting
thread378-126517: Reciprocating Compressor Piping - trouble shooting,
may also be helpful.
RE: What is a method for sizing a surge vessel for compressible fluids?
RE: What is a method for sizing a surge vessel for compressible fluids?
http://www.flexicraft.com/Hydropad_Accumulator/