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Title: Principles, Application, And Sizing Of Monitor Regulators
Author: George C. Hughes
Source: 1975 International School of Hydrocarbon Measurement
Year Published: 1975
Abstract: Public Law 90-81, The Natural Gas Pipeline Safety Act, became effective August 12, 1968. This act gave the Department of Transportation, Office of Pipeline Safety, the authority to prescribe and enforce safety standards. The effect of federal safety standards upon gas companies varied as to the degree of previous compliance with the USAS Code B-31.8. The coverage of both codes most certainly included overpressure protection installations. However, the federal standards, in addition to being mandatory, are subject to interpretation by others. The interpretation of unsafe overpressuring of the customers appliances, for example. What pressure is unsafe? 10 in. w.c, 20 in. w.c, 1 psig, 2 psig or 60 psig? The B-31.8 code stated in low pressure distribution systems, 2 psig was maximum unsafe overpressure. The federal standards deleted the 2 psig and substituted the performancetype language, a pressure that will not exceed the safe operating pressure for any connected and properly adjusted gas utilization equipment. Both the B-31.8 and the federal code state, If the maximum actual operating pressure of the distribution system is under 60 psig or less and a service regulator having the following characteristics is used, no other pressure limiting device is required. The characteristics listed for the service regulator define a non-relief, non-shut off, non-monitor type 2 in. pipe size and smaller service regulator. If this regulator were to fail, pressures up to 60 psig could be applied to the customers appliances. Interpretation of the codes by the author, it is all right to blow-up a few, but not many, or if the posted speed limit is 70 M.P.H. and you have an accident going 50 M.P.H. you were going too fast.

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