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Title: Freeze Protection For Instruments And Instrument Supply Lines
Author: James E. Mueller
Source: 2008 Appalachian Gas Measurement Short Course
Year Published: 2008
Abstract: Many natural gas systems suffer from time to time from bothersome equipment failures or line shut-off due to freeze-up. 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. Internal freeze-up occurs in instrument gas systems and pilot supply lines because of several factors. Residual water, left in a normally dry pipeline after hydrostatic testing, is often a cause. Hydrates sometime form at temperatures as high as 50 F. Summer months are diffi cult for some gas storage systems, when the storage pressures are generally at their highest level, instrument gas, taken from high pressure gas storage undergoes a severe temperature drop as the pressure is cut to the instrument gas pressures. Internal freeze-up from hydrate formation is a likely possibility.

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