Molecular Weight

This is another tough one, as there are no direct molecular weight meters. In many plants molecular weight can be obtained indirectly and in most instances does not change all that rapidly. Actually, gas analysis is a more fundamental piece of data. There are "on stream" gas chro-matographs but they are quite expensive. With an equation of state, which is geared to handle a broad line of gases by having a large stored base of gas constants, the gas analysis is the input of choice. Getting all this together into a compressor analysis program is somewhat of a chore, but is in the realm of reason.

A control room readout of molecular weight or, more correctly, a control room computer readout of molecular weight coming in at real time is currently available for the newer computer controlled plants.

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