We have a 4 stage vertical pump which suddenly has a lower output pressure and flow. The motor amps has also dropped by 10% or 20%. Marking the pressure and flow on the pump curve, it would appear that the pump curve has dropped by about 1/4. Is it possible that 1 impeller lost its key so...
We have a high pressure, high temp steam valve with a 2.5" stem, 416 SS material, with an electric actuator. We found the stem stretched like a tensile test specimen just before breaking. I do not think the actuator is large enough to exceed the stem's yield strength, even considering the...
Is the rate of pressure change in a piping system limited by the speed of sound? That is, if in a piping system the pump suddenly stops will the pressure at the end of the line be constant until a pressure wave travelling at the speed of sound reaches that point?
We have lubrication oil system that depends on continuous pressure to protect a pump and turbine system with jounal bearings. When power to one pump is lost a second pump turns on immediately but we have found that the system still trips on low bearing oil pressure. Are there any guidelines...
I would like to know what the coefficient of friction is for 90 - 92% alumina ceramic tile. I know that there are many variables that affect it but I do not need precise numbers. I just want to know how alumina ceramic compares to mild steel, stainless steel, and/or chrome carbide overlay. I...
I am looking for approximate relative wear lives of various wear resistant materials, such as ceramics, AR plate, Ni-Hards, chrome carbides, UHMW's, etc. I want to use the relative wear lives combined with the cost differences and ease of installation to choose the optimum wear liner material...
We have an unprotected dishcarge point from our power plant's cooling pond. It is possible that swimmers can come near it and we need to decide how to protect against someone becoming trapped in the flow of water. We are considering either a cage around the discharge or just floating barriers...
We have an unprotected dishcarge point from our power plant's cooling pond. It is possible that swimmers can come near it and we need to decide how to protect against someone becoming trapped in the flow of water. We are considering either a cage around the discharge or just floating barriers...
I have a drawing that specifies 1/8" thick C.I.R. for a flange gasket material. I suspect that it is actually natural rubber but what does C.I.R. stand for?
We need to torque bolts holding teeth in a conveyor drive sprocket, but there is not enough room to fit the head of the torque wrench on the nut (the bolt head is head by the tooth casting). I have heard of a method to estimate torque by counting the number of turns after finger tight. How...
I need to know what cast flint is. It is a type of steel we once used for sprockets on large coal scraper conveyors, but have since replaced with a different material. I want to know its hardness, strength, etc to compare to what we are currently using.
