Recent content by TD2K

Unless I had a very, very good reason I use the design temperature. Why? Because that is the temperature that the system can operate to so my materials in turn should be good for those materials.

I think you need a mass flow of the butadiene in that equation Latexman.

Lots of the pipelines in Saudi Arabia were constructed like that. I thought there was a specific term but I can't remember it (it's driving me nuts). All I come up with are berms but I don't think that is correct.

My experience is that there is no standard way how the instrumentation engineer or client wants these shown. Yes, I know ISA likely defines something but the individuals involved all seem to have their own preferences. As a process engineer, I would just draw two dashed lines from the LIC...

I don't have any experience with grease calculations and a quick look suggests my concern that this material is not a newtonian fluid is correct. Not an area that I have experience in. 1/4" by 5" = 0.13 ft/sec at 0.5 gpm and it's far slower in the main cylinder...

< Unfortunately I do not have the differential head curve but I do have pressure ratio curve which I think will correspond to the head curve. If I understand you correctly you are indirectly saying that the pressure ratio curve is also valid for the increased suction pressure, not just the...

316 generally has better corrosion resistance than 304 in many services but for a clean, sweet service like ethane it's a moot point between the two.

I'm having a hard time following the information. For a given flow, the NPSHR from the pump curve is in feet of liquid and it's the same feet of liquid be it feet of of ethylene or feet of propane or feet of water. So, assuming with ethylene you need 5.2 ft of NPSHR at 2160 gpm, you need 5.2...

I've seen that done. Strainers for example can be purchased with a code stamp (have to consider fire at a minimum IMO) or non-code in which case most of the clients I've dealt with are willing to treat it as part of the piping and isn't protected against fire. ASME Section 8, Div 1 has a good...

Since the piping is 304 SS and this isn't used much, I wouldn't see a concern with it.

< how can there be any flow at all in the blocked outlet case? > The flow goes through the PSV to avoid over-pressuring the system. Look at the flow curve for the compressor. Calculate the head required to compress the inlet gas from its inlet pressure to the relieving pressure. Use the...

It's a matter of NPSHA versus NPSHR. NPSHR for most centrigal pumps increase with flow and past the BEP, significantly. A fully open discharge valve gives you the maximum flow if there no type of flow control device on the pump such as variable speed or a discharge control valve. So max flow...

Your equation is correct. The issue is what pressure drop do you use for the strainer? Do you use it as an equivalent length of piping per the vendor's charts which is when the strainer is clean? Or do you want to assume a fixed dP representing the pressure drop in a dirty state? If you are...

" whay we say this point in to isulation....isulation dont have any flange>? " < i talk about insolation joint whith material api 5l grade b and class 600# > I don't know what you are referring to. Are you talking about an electrical insulation flange? kit?

An approach I've seen used is the errosional equation from API-14E, 100 divided by the square root of the density which for most oils gives a maximum velocity in the mid teens (ft/sec). For short term operation, you can use a value 25% higher. If it's a clean fluid and you aren't close to the...