E907 TPC Gas System

Gas Risk Assessment

Gas System Diagram

Fischer Porter Flow Gauges

Matheson Flow Gauge Principles

Includes table of correction factors for gases other than air. The correction factor is defined by

Flow(Air Equivalent) = Flow(Gas) x Correction Factor(Gas),

or

Flow(Gas) = Flow(Air Equivalent) / Correction Factor (Gas),

where

Flow(Air Equivalent) =

indicated flow meter reading

Flow(Gas) =

actual flow of gas

For gas mixtures, I assume we multiply the individual correction factors by the composition fraction. As a crude check, compute the correction factor for air (78% N₂, 21% O₂, 1% Ar):

0.98 x 78% + 1.05 x 21% + 1% x 1.18 = 0.997,

when we should get 1 by definition.

For P10 (90% Ar, 10% CH₄), we have

Correction Factor(P10) = 1.18 x 90% + 0.75 x 10% = 1.137

Magnehelic Pressure Gauge

Procedures

Leak Check Procedure

Cylinder Change Procedure

Purge Procedure