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I would like to have two worksheets, I'll call them A and B, within a workbook. I would like worksheet B to display only certain data or cells from worksheet A. The goal is to be able to use worksheet A for my estimating work, and have only those values which I want the customer to see...

Thanks for all of your input. Hopefully I can address recent postings. The reason I didn't want to ask the vendor to produce a curve just for this one instance is because I have run into this problem multiple times and would like a solution that I can transfer comfortably to different blowers...

Thanks for your replies, but I think my question remains the same. Please note, I understand that scfm in should equal scfm out. However, how do you recommend I calculate/convert to scfm? I ask because before posting this question, I ran through the calcs myself to convert the flow reported by...

ChasBean1: Here is the manufacturer's spec sheet for the particular blower with the vacuum and pressure curves. I'm sure this will help! http://www.rotronindustrial.com/pdf/EN_CP909.pdf

ChasBean1, Thanks for your reply, but I am still confused. What do you mean the performance should be the difference between the inlet and outlet conditions? Maybe using the real numbers can help us communicate better so here is the data: There is a pressure indicator on both the suction and...

When a blower in a vacuum application also has piping on the discharge side, resulting in positive pressure, how do you determine the flow, temp rise, input power etc from the performance curves? Most blower vendors' literature includes separate vacuum and pressure curves for flow, temp rise...

Wouldn't I experience problems with the piston pump too if there are some abrasives/ small solids present due to the internal valving? I guess it looks like a progressing cavity is still the best way to go. This is what we have used in the past but I find we replace the boots (stators) quite...

How do I relate the published data about double diaphragm pumps and their "dry lift suction capacity" to NPSHr? The manufacturer catalogues I have don't show NPSHr on their diaphragm pump performance curves. I presume I have to convert the dry lift capacity they publish (10 ft dry...

By knockout tank I mean a liquid knock-out or vapor/liquid separator tank. The tank is under vacuum because it is upstream of, and in line with, a high vacuum pump (liquid ring) used for dual-phase extraction of soil vapors and groundwater from wells. The soil vapors and groundwater need to be...

Thank you for your help. I have had good experience with progressive cavity, but have not used regenerative turbine - this I will look into. But what about my original question - can you use an air-operated double diaphragm pump to pump out of a vessel under vacuum? Your comment on this would be...

Its pretty low flow and pressure. Usually no more than 30 gpm and no more than the 10 psig. The fluid is recovered groundwater and the flow is intermittent (controlled by level switches in the tank), only minimal control is necessary (manual control valve or bypass vavle).

What are the most recommended pump types for discharging liquid from a liquid knockout tank that is under vacuum? Example, a knockout tank under 27" Hg vacuum, and a pump is desired to operate @ 10 psig discharge pressure while the tank remains under vacuum. Normally I have seen a PD pump...

I have a roots blower at a remote site. The blower was supplied as part of a complete package by the vendor, including belt-drive (speed increase set-up) and motor and accesories. Based on our current process/ambient presures and temperatures, and the blower RPM, the vendor's modelling program...

The gas is air and the compressor is outfitted with an aftercooler that the vendor tells me allows a discharge temperature of 25° F above intake gas temperature. Does this seem unrealistic?

Can someone verify that I am calculating my scfm to acfm conversion correctly? Problem: The goal is to achieve 35 scfm at 100 psig. The conditions are 6500 ft elevation (assume 11.56 psi absolute atmospheric pressure) and I am assuming 80° F as the compressors discharge temperature based on...

BUT.......with plastic pipe you have a very large relative roughness, D/e, since e is approaching 0. This then means you have a very low friction factor in fittings (I think f=0.008 is the lowest friction factor indicated on the diagram). So should I always assume that f=0.008 when calculating...

Nevermind, I think I just figured it out for myself! Since ft is the friction factor for fittings it is assumed to be in the zone of complete turbulence. And since the curve on the Moody diargram is nearly flat in this zone, ft can basically be read straight across the chart from the calculated...

Thanks very much for the information. I am familiar with using the Reynolds number to determine the friction factor off the Moody diagram. My confusion is with the difference between f and f-subscript-t. In the text I use (Motts Applied Fluid Mechanics), Darcy's formula is written as: hl = f x...

What do you use for the dimensionless friction factor (f) for PVC pipe when calculating frictional losses for air flow? Are there any charts out there with friction factors for different sizes of clean, new SCH 40 PVC pipe? I know there is little data for air flow in PVC pipe because it is...

Bob, Just want to broaden my base for now (more courses later!!!) and looking for a shortcut to the right material. Thanks for the suggestion. RV