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Thankyou all for the responses. That has given me the useful equations and background information I needed. My curiosity now stems even further as to how those relationships/equations were derived in the first place, but I guess that's like asking a question why does gravity act the way it...

Apologies, here's a bit more background. If I have a mass rate of gas (Mol wt. 20) and want to read off a graph with the x-axis being a rate of air (StdL/hr) what the equivalent rate of air is, how would one do this? I used the ideal gas relationship (PV = nRT) to take the mass rate of gas...

Hi guys, Why is the relationship between the mass flow and the density not linear in flow through an orifice?

I am installing a new PSV on an HP methanol pump discharge line and I need to prepare leak test P&IDs for new flanges. This is a brownfield job therefore my issue is there are no isolations downstream of the PSV so I was wondering how to leak test the PSV flanges as it is not possible to create...

Thanks all for the input - it's looking like we're going to inject them with nitrogen and then either flush with seawater or pig using a gel based pig. There are still quite a few unknowns - in particular because pigging of the line hasn't been done previously so the contents are a guess at the...

It was just depressurized and has just been sitting there

Sorry, let me clarify, it is primarily a gas pipeline with a small amount of condensate in it.

Hi there, I'm no specialist in decommissioning of pipelines, so would like some thoughts from those with some experience in this. I've got a gas condensate line that's been shut in for several years now and looking to be decommissioned. First task is to actually work out what could actually be...

Hi, I am looking to size a degasser at a high level (i.e. I don't yet need to specify liquid levels) and wondered whether I should size it for a horizontal two phase or three phase? At first I thought two phase, but then wondered that maybe I need to consider three phase because as well as...

Hi, Can anyone advise, as the results I am getting are confusing the theory I thought! I did a blowdown in Hysys of a vapour phase stream with a fire case with water and then removed the water and normalised my components and did it on a water free basis. I had thought that the water free...

Hi guys, I need some advice. I am doing some work with flarenet so I require some peak blowdown rates for my system. My blowdown valve is a globe valve (CV = 77). I am going to use hysys, but I am not sure about the vapour flow equation in Hysys, so I wonder if anyone knows a way to convert my...

Cheers guys will take a look into those possibilities

Yes, that's correct. It's trying to fit something new into something old if that makes sense!

Anyone got any ideas for what to do with an annulus vent which is not able to be tied into the flare system because the flare is too high a pressure for this to be possible?

Hi everyone, I have an existing control valve and I wish to check it is adequate for some different flowrates. When I model the valve in Hysys with a pressure drop, I notice that the liquid phase upstream of the valve becomes liquid with a bit of vapour downstream. Do I need to use any...

T2 = 8 C P2 = 163 barg All vapour. Thanks for your help guys.

Thanks, just to confirm: V,R,n will be constant so cancel out of the universal gas equation. P1 - 220 barg T1 - 41 C Z1 - 0.7784 P2 - unknown to solve T2 - 8 C Z2 - ? (if I use compressibility in equiation, do I not now have too many unknowns - i.e. two unknowns Z2 and P2 and only one equation?)

Hi, I have a 17 km gas lift pipeline (no water present in the gas as the gas has been dehydrated). It is at a temperature of 41 C and 220 barg. The pipeline is closed in and then left until the temperature has cooled to seabed temperature of 8C. How do I work out what the new final pressure...

Thanks for the responses so far, it is very difficult to explain without speaking face to face, so perhaps someone could provide me with contact details of a control engineering company that I could discuss use of a PCV setup against use of an LCV set up when running produced water from a...

I'm trying to work out whether I can use a level control setup for my solution. I've attached a schematic showing only the water stream which I am dealing with. My pump is a positive displacement pump. At the moment my configuration uses a pressure control setup but I am not sure if this is...