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So then is the density/SG relationship handled the same way for gases? If you want to know the density of a 0.6 SG gas at say, 400 psig and 120 F, don't you need to determine the density of air at 400 psig and 120F?

Compressible flow is something that I am admittedly new at. But everyone was new at some point. Senior engineers love to wave the red flag when young engineers are given responsibility but also roll their eyes and curse this generation when they don't want to dive in and figure things out. To...

So basically choked flow at the open regulator? I hadn't even thought of that! Makes sense though. Thanks for the input.

I am trying to determine the relief load required for overpressure protection of a natural gas system. The system I am analyzing takes pipeline natural gas (800 psig), and uses a pressure reducing valve to lower the pressure to the equipment (400 psig). There is a safety valve on the downstream...

I understand there's a conflict from a client's perspective, but surely it is legal right? That's the whole premise of EPC companies that provide turn-key projects. Maybe it's different in the residential sector, but in industrial its very common as long as you have all your licenses...

As far as I know you would need to have your general contractors license, including all the insurances, experiences, tests, that go along with it. Even if you subcontract all the actual work to another contractor.

Definitely want to avoid socketwelding because of its high corrosivity. Also I didn't put in the original post but it is a settling slurry which adds another reason to buttweld.

They should be done as part of the same calculations. The stress analysis should calculate stress and deflection for all cases applicable to your system. So if your piping gets hot and is in a seismic area, then the load combinations should reflect that. I'm still an amateur compared to most...

@LI Good point, thanks for the wisdom. I've never gone through the pipe survey process, so I'll need to do some research.

LittleInch: It is a new connection, not repairing a broken piece. But I think your approach is a good one either way - it seems unnecessary to assume complete replacement from the get-go if we can properly qualify the system. Like you said, pressure testing would qualify the existing pipe, and...

Hi, I am working on a piping modification project that involves hot corrosive fluids (>200000 ppm chlorides, 200 F). The current piping is 1.5" sch 10, and the material is 6% moly (254SMO). Design pressure is 15 psig. As part of the project, we will need to tie in new piping to the old...

This might be a different topic, but I'm not a fan of music anywhere in the workplace. I was on a construction crew throughout college, and it always bothered me when people had earbuds in when working and I could never get peoples attention unless I walked over and tapped on their shoulder...

Snickster, That makes sense, for an on-off type there would just be a few sections that would be marked as N/A such as the positioner section.

Thanks LittleInch and Snickster. Those BP specs are a very good reference, I'll save them. Are these control valve datasheets typically filled out for on/off actuated valves? Or just for true control valves.

Hi All, I am trying to put together project documents for the control valves on a process piping project. The design will be issued to a number of contractors to bid on. I am trying to understand where the design responsibility is split between engineer and contractor for control valves, and...

It seems like the pressure thrust should not applied to the anchor that represents the pump nozzle. In reality, the pressure thrust would be applied in the pump casing and not at the nozzle. As in the pump manufacturer would have already accounted for any pressure thrust in the housing and it...

I'm trying really hard to discern if stxa's post is a joke or not. I keep telling myself it's satire, but then again posts on this website never cease to amaze me.

If you were to move the butterfly valve to the outlet of the pump, you would have issues with the system draining as the manufacturer states unless you put something there to hold back the fluid. I suppose you could put a high cracking pressure check valve where the butterfly valve currently is...

I would assume if the total volume of fluid in the system is larger than the volume of the tank, it has the potential of overflowing. In your case, I imagine it could burp air bubbles up the piping as the fluid fills back into the tank. Or siphon its way through. On a design I worked on, the...

Hi All, I wanted to see what others were using to do construction cost estimating for industrial jobs. We are a smaller EPC firm who usually hires an estimator to help bid jobs but we want to start taking this on ourself. I'm looking for techniques, methods, or software to start to learn this...