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I vaguely rememeber something perhaps in an older version of API-520 that suggested a reasonable flowrate through a leaking check valve was 10% of the normal forward flow. Has anyone seen anything like this? Almost Broken

I have heard but not found any documentation that says the use of multiple valves during a blowdown are not allowed. The problem is a single valve for blowing down a large gas volume as found in a gas plant does result in a larger flare system that any other case. I would like to have the...

If I size a blowdown valve to depressure a sour gas plant from 1000 psig to 100 psi in 15 minutes I end up with a large flare system that is not warranted for other failures. My question is does anyone know if I can stage the depressuring with a smaller valve that restricts the max flow to...

I have a case where I need to condense steam from 10Barg and 180C to atmospheric conditions. This is made more interesting in that the steam has been cooking animal carcasses for an hour or so. As a result I expect to see triglycerides etc condensing with the steam or acting as an exchanger...

We are going to do a phttp://www.eng-tips.com/faq.cfm?pid=124ressure survey. I had hoped to find the issue without going to the plant which is 100 miles past nowhere. The gas composition we believe to have a handle on as we know the gas going into the plant. I believe HYSYS does a reasonable...

I have a case where we have an 750 bbl 8oz tank that goes to flare through a 2oz weighted check valve. There is a water dump into the tank that is calculated at 700 cubic feet per hour. The tank is gas blanketed witn natural gas at 1 oz. From the check valve the gas goes through about 1000 ft...

I have seen two methods of adding makeup water to an amine plant. One method adds water to the surge drum and the second method to the inlet of the high pressure amine pump. Does anyone have any insights as to what is the better way? Almost Broken

My client is producing gas and oil from a frac'd well. His concern is the erosion of the pipe due to the size of the solids returning with the fluid. Does anyone know of a way of predicting erosion by particle size? Almost Broken

I am sizing a flare stack and the height is a function of the heat generated at ground level as per API 521. The heat at ground level is a function of emissivity. The default seems to be 0.2. However a heavier gas should have a higher number and a gas high in methane and H2S would have much...

I am having a disagreement with our Safety guy. He says HYSYS can not handle two phase blowdowns. Any proof one way or the other?

The main difference between Nm3 and Sm3 is temperature. Nm3 is at 0C (32F) while Sm3 is at 60F (16C). Both are taken at atmospheric pressure.

I have a situation where we need to mix 20,000 bbl/d of LPG with 200 mmscfd of gas upstream of a compressor. The 6" LPG connection seems to be able to only "dump" the liquid into the gas line, leaving me with concerns about reaching steady state. HYSYS says that thermodynamically it will work...