Capture Pumping Technology by K. Welch

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By K. Welch

It is a useful textbook written to be used by way of engineers, scientists and technicians. it isn't meant to be a rigorous medical remedy of the subject matter, as this is able to fill a number of volumes. relatively, it introduces the reader to the basics of the subject matter, and gives adequate references for an in-depth learn of the topic through the technologist. the writer has a life-time instructing credential within the California group collage process. additionally, he has taught technical classes with the yank Vacuum Society for approximately 35 years. scholars attending lots of those periods have backgrounds various from high-school graduates to Ph.D.s in technical disciplines. this can be an exceptionally tricky type profile to coach. This booklet nonetheless endeavors to arrive this related viewers. simple algebra is needed to grasp many of the fabric. yet, the calculus is utilized in derivation of a few of the equations. the writer dangers use of the 1st individual I , rather than the writer , and you rather than the reader . either are regarded as in negative flavor whilst writing for booklet within the medical neighborhood. even though, I am scripting this ebook for you as the topic is fascinating, and that i take pleasure in instructing you, maybe, anything new. The booklet is written extra within the vein of a one-on-one dialogue with you, instead of the writer lecturing to the reader. There are anecdotes, and examples of a few disasters and successes i've got had over the past forty-five years in vacuum similar actions, i'm going to test to not understate both. finally, there are a couple of equations which if memorised might help you as a vacuum technician. There are lower than a dozen equations and part that many ideas of thumb to memorize, that allows you to be drawn on time an back in designing, working and trouble-shooting any vacuum approach.

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BASIC THEORY 41 Three Gauge versus Fischer-Mommsen Results Over the years, I've found that the three gauge method will yield indicated pump speeds which are 10% - 15% higher than results of the Fischer-Mommsen apparatus, for the same pump. (2 6 ) This is true for all of the gases. Also, for reasons which are discussed in the chapter on cryopumps, the theoretical speed of a cryopump for H 2 0 should be within a few percent of actual measured speeds. However, cryopump speed tests for H2 O, with the Fischer-Mommsen method, will yield results which are approximately 20% lower than the theoretically predicted speed values.

4), equations applicable to an air conductance, to derive the value of a conductance for other gases. 3), we must conclude that the expression (T / Mair) ~ went into deriving the constant. 7) where k is a constant. 3)) by the value (Mair) g and divide the sam~e expression by the value (Mg) ~ . 1 for values of Mg for the different gases. 7 amu. 3) to compensate for a different gas at a different temperature. Assume that we have calculated the conductance of an aperture for air, and we want to know the value of this conductance for helium.

3 Three Gauge Method The three gauge method of making speed measurements requires the use of an apparatus similar to that shown in Fig. 4. (1 8, t a ) Three vacuum gauges are required. Pump throughput, Qp, is determined by measuring the pressure difference along tube L 1, of calculated conductance C 1. This manifold is a long tube. 4) is used to determine C1. 1 L1 [PI-P2]. 11) 38 BASIC THEORY - - ~ ~_2~= L1 t ~--D~ L2 Da/Z ! 4. Three gauge speed m e a s u r i n g dome. PUMP ~ INLET / The speed of the pump is found by setting Qp = Sp P_.

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