There is a lot more into selecting the right compressor for an application other than the horsepower. As follows:
The flowrate required at differential pressure (discharge minus suction pressure), inlet/discharge temperatures and pressure ratios and other properties of the gas being pumped...
The way I see it is as follows:
At liquid levels shown the pressure at the upper tee connection is basically equal to the height of the light liquid. This height of the light liquid produces a differential pressure of the light liquid relative to the tee connection. Looking at the heavy...
Maybe and maybe not. The actual required pump motor horsepower may be under 3 hp although the flow diagram shows 5 hp. If the pump works ok with a 3 hp motor then the 5 hp motor was oversized. A pipe pressure drop calculation is performed initially to size a pump and determine the estimated...
Would not welding of a flange to pipe be no different from welding a circumferential pipe joint? I don't recall weld of WN flanges to pipe being treated differently.
A given pump can operate at a range of horsepowers depending on the flowrate and differential pressure and operating point on the pump curve. Therefore when it is stated that the pump is 5 hp it means it has a 5 hp motor and operates at a differential pressure and flowrate that requires no more...
I believe any pressure developed in the impeller before exiting the periphery of the impeller is transient and does not contribute to the pressure produced at the discharge of the impeller in the volute due to conversion of kinetic energy, of the fluid exiting the impeller, to pressure. I have...
Never is a long time, and these four statements hardly add up to "never weld attachments to any SS pressure pipe of any thickness" IMO. All four are valid concerns, and may be more or less important for certain loads, thicknesses, pressures, and materials, but are also all valid concerns when...
I don't see an SIF for a reducer in B31.3 2014 but there is one in B31.1 2016 - note that flexibility factor is 1
(13) The equation applies only if the following conditions are met:
(a) Cone angle does not exceed 60 deg, and the reducer is concentric.
(b) The larger of D1/t1 and D2/t2 does...
@Snickster Thank you for the attached Kellogg method as this is most helpful. Are the Caesar stress results reflecting these localized stress results at points of restraint? I did see the WRC sub program in Caesar but would the geometry of the dummy leg welded to the elbows be reviewable with...
Looking further and as KevinZ indicated there is a stress concentration factor applied to the reducer (based on the connecting piping diameter and wall thickness). However, the SIF is based on the angle and also D2, t2- see attached.
I believe you would just analyze the connecting pipe at wall thickness of the connecting pipe at the connecting pipe wall thickness and at the location of the connections. There is no analysis of the reducer sloping section or stress concentration factor applied to the reducer as far as I can...
Caesar does have a WRC 107 sub-program. It has been a while since I used Caesar and the WRC 107 sub-program but I believe it can be used independent of a stress analysis. For instance, if you model a dummy leg and node at the connection of the dummy leg to the pipe then Caesar piping stress...
Here is the Kellogg method. It was the first method used and is still used today by design firms I worked for as the first check. If check passes the Kellogg method then no further analysis is required.
When designing piping systems you should check for local stresses at pipe supports, especially when using thin wall pipe such as Sch 10s. I had a project in which we used all Sch. 10s stainless steel and the local stresses at pipe supports were way above limits. The piping in this case rested...
I did my analysis on my own without having tried to do a differential equation set up like this in about 20 years so I don't know what you are talking about.
Well I was close. I forgot to include the weight force of the mass acting down, and I did not realize that you can reduce the restriction effect to a linear function R*Q = R*A*V and then use an approximate value of R as shown. I think my equation is still correct if I include the Mg factor...
