Don't forget to revisit all pressure relief (fire, blowdown, burst tube/ tubesheet rupture) calcs in light of the design pressure change if you proceed with this.
What jcaiken says is correct as I understand it. the Institute of Petroleum has some guidance published on this. For the relief backpressure, the line/ disk sizing methodology is based on the backpressure produced by the slug of seawater pushed ahead of the expanding gas, as per API 520/521.
If sizing for relief valves lifting on blocked outlet, then the gas relieving from compressor A can't be also simultaneously coming out compressor B, if the order is A>B>C in series. Since after all blocked outlet on A is blocked inlet on B. Its not feasible to have A and B both pushing open...
Effects of pressure drop depend on whats in the tubes and conditions...
If you want to use a program to design heat exchangers use HTFS-TASC. Or buy a book.
After reading your last post I did some quick analysis in Excel of this using Cranes method for gradual reducers as well as sudden reduction:
const beta factor result
Crane 0.5 0.75 1 0.375
ISA 0.5 0.5625 1 0.2812
2-13 0.8 0.75 0.258 0.1552
2-13 refers to the...
ISA S75.01-1985 quotes for an inlet reducer (Eq 6, pg 15):
K1 = 0.5 * (1 - (d^2/D^2))^2
Crane 410M page 2-11, eqn 2-10 quotes
K1 = 0.5 * (1 - (d^2)/(D^2))
These would appear to be equivalent concepts but there is a difference - ISA quotes an additional squared at the end of the eqn.
So, am I...
Hi,
I'm attempting to assess (at a preliminary stage) whether a vacuum pump system (liquid ring pump and ejector operating in two stages) is adequate for an increase in duty in the seawater flow. I have a pump curve for the liquid ring pump but no other information. It gives a curve of torr...
Please clarify - an orifice for going from 3 psig to 1 psig or an orifice to go from 5 psig to 3 psig?
Whats your intended downstream enduser pressure?
Thanks. What you describe is exactly the sort of scenario that the Loss Prevention Bulletin describes save that the pressure differential driving the pig was on the order of 400 psig for a 12 in pig...
When you're doing this do you have any estimation techniques you use for assessing how fast...
This is a tricky question to define as its not a specific item or system, but a generic concept. While reading the Loss Prevention Bulletin article this month on pigs, I read a comment about "20 tons of force" driving a pig out of a pipeline which had its pig reciever open causing the pig to be...
If I have a vessel with a mixture of hydrocarbon (2 phase) and water (liquid), then raise pressure and temperature till they are higher than the critical points of the hydrocarbons alone, what happens? Does the water affect the critical point (assuming that effectively all the water is in its...
I have another obscure enquiry:
I have a natural gas compressor with a PCHE discharge cooler, which in some situations may for a while be called on to pressurise 45 barg gas to 160 barg. I have found that discharge temperatures for this operation are close to the cooling medium boiling point in...
Does anyone know of any standards that define acceptable designs and possible issues with positive isolation such as DBB, spectacle blinds, etc? The only one that I know of Is NORSOK P-001 section 6.
Question: Does a multi-hole orifice have any difference to a single hole orifice in terms of behaviour (other than the reduced noise levels?). I am thinking in terms of increased downstream turbulence as the two or more flows recombine, changes in the balance of flow, etc causing increased...
