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Title: Freeze-Up Protection For Instrument And Pilot Gas Lines
Author: A. J. Kerr, Jr.
Source: 1983 Appalachian Gas Measurement Short Course
Year Published: 1983
Abstract: Many natural gas systems suffer from time-to-time from bothersome equipment failures or line shut-off due to freeze-up. Instrument and regulator pilot supply line freezeups can be avoided by the use of flameless, gas-fired catalytic heaters to externally heat the instrument piping and equipment or by adding a packaged, gas-fired catalytic instrument gas heater to preheat the instrument gas stream. Cold, moist climates accentuate the problems of external freeze-up. With the temperature drop accompanying gas regulation, ice often accumulates on instrument gas regulators, plugs the vents and makes the equipment inoperable.

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