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All This is a question regarding overboard lines from pumped seawater systems. I am aware of the gravity flow equations that should be followed; Froude number, Norsok P-001 etc for "dump caissons". Well, I have discovered a line that has not been designed that way! It has a froude number...

Katmar Thanks for your advice. On that basis I calculate 105,000 m3/hr air so you were pretty close! Unfortunately my already installed vent is not that large! So a restricted vent will result in this system running under vacuum? Perhaps I should have been more careful which forum I chose...

Enguest For oil and gas course in the UK I believe Heriot-Watt university in Edinburgh and Robert Gordons university in Aberdeen do good distance learning MScs and degrees. As Aberdeen is the centre of oil and gas in the UK, these courses are recognised widely regards, Matthew

Having read through some more answers (i.e. thread378-81608) I can just add a couple more things: When the "syphon" point is mentioned, I guess this is referring to the point where Froude = 1. Self venting occurs if FR<0.3. In my situation I cannot change out the pipework, and I cannot reduce...

All I have a problem with cooling water flow, and am getting confused as to how the system works hydraulically. I have a high flow seawater pump (7000 m3/hr) cooling a steam turbine condenser. The Pump is mounted in a caisson approx 30m below process deck. The condenser is mounted at around...

OK thanks The valve I have is a globe valve (Masoneilan), so I guess for this type then a mechanical screw stop of some kind would be fitted to prevent it being screwed out past a certain point? OK - will look at the change of trim option too Thanks Matthew

All I am looking for some technical information regarding fitting a mechanical stop to a control valve. I am a process engineer and need to inhibit a valve from moving past around 80% of it s trave due to the limit of the downstream PSVs. Replacing the valve is not an option The question is...

Hmm Yes I did those searches first but they don't really tell me about the mechanics. I also printed out Yarway and Blackhall valve bumf from their websites. While I now understand mainly the way these work I still don't get how they are flow specified. As for my local vendor, I haven't been...

Hi All I have a question regarding Yarway Automatic Recycle Valves. They all seem to say they are "flow sensing", but then seem to operate mainly on springs, while some have orifices. can anyone succinctly answer how they sense flow, and not pressure related flow (as a set spring would do)...

Also the concept of a "pressure discontinuity" is exercising me, but I gather in a sonic system there will likely be one at the tip (along with a lot of noise!)

All I have a situation at the moment. I have a steam system with a seemingly undersized tailpipe - the flow will go critical / sonic. The relief is to atmosphere as it is steam. The question is, where will the flow go sonic? My understanding is that on the initial release of the PSV into an...

Morten It is an oil well, scenario being that gas has settled out at the top of the well for some reason (maybe a kick etc). This gives a limited volume of gas - maybe 500ft in the casing is realistic. What were your thoughts?

Well not quite a blowdown: Situation: I have a "reservoir of gas", actually a well of gas under pressure behind a choke. Those familiar with drilling it is the choke located after the choke line in a well intervention / kill situation. After the choke the gas will flow to a mud/gas...

All I am a familiar user of Pipesim, but am also aware of the Prosper package.They seem to be reasonably similar in what they claim to simulate. Does anyone know the main differences of application of these two packages, and when one might be superior to the other? Cheers Mat

I would recommend "Standard Handbook of Petroluem and Natural Gas Engineering". Very good covering reservoir, production, drilling etc. Less on the downstream separators topsides etc

I am attempting to design a produced water degasser. The water will be first separated in first / second stage 3 phase separators and then pumped to a break tank. After this the water is pumped through hydrocyclones to reduce the hydrocarbons to 30-40ppm. The produced water degasser will...