I designed as total for conservative. I'm still holding a concern that the bottom part of pipe will buckle if they put a dummy support at the very bottom.
I never designed such a long vertical drop before so I would be very conservative. I don't know how long but you may be talking about 1000...
My understanding of how a backpressure regulator works is that you set it for a given pressure to be maintained on the upstream side. So if you set it for 10 psig it will try to maintain this pressure on the upstream side. If the pressure downstream is lower than 10 psi say 5 psi at a given...
In Caesar II the hanger would be modeled as an Y-Rod support. This is a vertical support that allows for swinging motion when moved horizontally. Search internet for:
How to model rigid hanger supports with Caesar II.
I believe the issue is that as a hanger moves horizontally it also moves up due to the swing angle. At some point the angle is great enough such that the hanger is able to exert a large horizontal force due to horizontal component of tension in the hanger rod at the same time the pipe needs to...
Option 1
The weight of the contents will be transferred to the pipe at the bottom elbow pushing down vertically, plus weight of pipe will be total design weight for the hanger. I don't see any issue with letting pipe hang from a single hanger above with lateral bracing along the pipe as you...
I found a digital copy of the Grinnell manual on their website attached. It discusses the design of hanger systems including how to handle horizontal movements in supported piping.
I think that if I remember correctly a hanger is considered to be able to swing a certain amount of degrees before it locks. I have an old Grinell manual hard copy that goes into a discussion on this situation. I need to look for it and make a copy and will post later.
Attached are some references I have for GRP/FRP piping design. It has been years since I did actual calculations using Caesar so I forgot most of how I performed them, but the attached may help.
I would size the orifice for two to three times the actual desired flowrate with a globe throttle valve downstream to tweak the flow to what you really need. The entire system piping would be designed for the maximum operating pressure of the upstream system. I agree with Kumar about the...
The attached is a study of converging fittings that puts coefficients into equation form which may be what you are looking for. This is referred to in the also attached McGill Duct design Guide page A-66.
"The negative loss coefficients of certain fittings are derived from experimental data...
I would not use that in process piping. It looks like it is more for plumbing and HVAC piping. The attachment you posted provides a link to a document which provides allowable loads in all three directions. For 3" it lists F vertical = 800#, F axial and F lateral = 125#. However, I don't see...
The flow of 4.5 m/sec across the top of the stack will not "entrain" air and cause it to flow through the stack. What it will do is cause a lower pressure than atmospheric at the stack exit due to the velocity relative to still air. Air at 4.5 m/sec produces a lower air pressure of 0.05 in...
Yes I would like to see your results. The B31.1 calculations is a cookbook method that takes the real method using the ideal gas equation and puts into a cookbook formula. I will show you the real equations using the ideal gas equations and how the B31.1 calculations are derived from these...
The method is B31.1 is applicable. The method in B31.1 assumes that there is sonic velocity at the discharge of the elbow pipe at point 1 and that there is also sonic velocity in the vent pipe exist at point 3. In your case there is not sonic velocity developed for the flowrate and pipe sizes...
