Hi, does anyone know of any reports, studies, textbooks, etc. that I could reference for the design, maintenance, and operation of journal bearings for vertical shaft machines? All of my textbooks focus more on horizontal axis machines, such as steam turbines, however I am looking for more...
I am designing a bolted blind flange on a very low pressure system (less than 20 psi) and I am using BPVC.VIII to determine the minimum thickness of the flange. I am using equation 1 because it will be a flat face flange with full face gasket, so there will be no edge moment. The formula is very...
Hi,
I am using ASME B31G to estimate the remaining strength in a corroded area of a pipeline. I have all the info I need (corrosion depth, length, etc.). When calculating the hoop stress of the pipe at the operating pressure, should you use the nominal pipe wall thickness, or the remaining...
Hi,
I am still new to using the AMSE BPVC, and I am a little confused by the bolt load calculations. I understand that you need to calculate the bolt loads required for the design conditions (Wm1 and Wm2) and select the greater of the two to use as your minimum required torque, however I don't...
Hi,
Are lugged valves available in raised or flat face? It seems that every lugged butterfly valve that I come across has a flat retainer ring, but then the lugs are offset, such that the lugs would not come in contact with the flange when they are bolted together. This to me seems that it would...
Hi. Does anyone know if it is acceptable to use spiral wound gaskets with flat face flanges? Is there any standard that covers this? I know that spiral wound gaskets are typically used for raised face flanges, however I'm wondering if I can get away with using a spiral wound gasket with an inner...
Hi,
I am looking to install a lugged butterfly valve with a 316SS body. I'm trying to decide if I should use B7 or B8 (class 2) Hex bolts for this application. The flanges are also 316SS. My concerns with using B8 bolts are the lower strength, and the risk of galling (even if using a...
Hi,
At one of our plants, we have a booster pump for a cooling water system. It draws water from the penstock, which according to the transducer has a pressure of 21 PSIG. The suction-side piping stems right off the penstock then there is a ~5ft 2" hose that connects to the pump. There is a...
Hi, I have a question regarding the Full Load Amps that is provided on a centrifugal pump's nameplate. Is the FLA equal to the maximum current that the motor will draw?
I noticed for most centrifugal pumps, the power input peaks around the middle of the curve, then drops off a bit as the pump...
Hi Everyone, could someone please explain to me the difference between a soleplate and a mounting plate, when referring to the API standards. I've been reading through API 686 and there are different grouting requirements for mounting plates compared to soleplates, but I can't find clear...
This question may sound kind of dumb, but this has been confusing me for the last few days.
Here is the scenario. I have a pump system that I've calculated the total pump head for, given a desired flow rate, and I've found a pump that can provide that flow rate at the calculated head. It is...
Hi, I need to connect a 4" cast iron valve to PVC pipe. The cast iron valve has ASME class 125 flanges at both ends. I was thinking of using a PVC NPT TOE nipple and PVC coupling to connect the PVC pipe to the cast iron flange (C.I. flange > PVC nipple > PVC coupling > PVC pipe). Is it okay to...
I am looking to install a 4" cast iron check valve (flanged connection) in a vertical section of a plastic pipe. The check valve weighs 75 lbs. What would be the best way to support the valve to the wall? Are there any flanges that can connect to wall supports? Any links to products would be...
Hi, I am looking for some advice on selecting the pipe size / discharge velocity for a sump pump.
Almost every pipe/pump design guideline that I have read suggests that the discharge velocity for a pump should be between 9-12 ft/s. I have desired flow rate of 350 USgpm, therefore using the...
