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U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Interpretation Response #PI-82-002 ([Wisconsin Public Service Commission] [William A. Slagg,])

Below is the interpretation response detail and a list of regulations sections applicable to this response.

Interpretation Response Details

Response Publish Date:

Company Name: Wisconsin Public Service Commission

Individual Name: William A. Slagg,

Location State: WI Country: US

View the Interpretation Document

Response text:

Mr. William A. Slagg, P.E., Director

Gas Bureau, Engineering Division

Wisconsin Public Service Commission

Hill Farms State Office Building

Madison, WI 53702

Dear Mr. Slagg:

We regret the delay in responding to your request for an interpretation of §192.201(a)(2)(i), and it is our conclusion that an interpretation, as such, is not necessary. You are correct in stating that §192.201(a)(2)(i), when it states "may not exceed," means "may never exceed."

The allowable override of 10 percent of the MAOP is included in the regulation which, for your example, amounts to 6 psig. The MAOP plus the 6 psig equals 66 psig and not the 105 psig which the calculations, submitted by the operator, showed that the system could be subjected to for 21 seconds.

According to the relief regulator's manufacturer (see copy of Bulletin P-13F enclosed), the 2-inch model 63F back pressure regulator is undersized for this application.

If you have any further questions, please contact me.


Melvin A. Judah

Acting Associate Director

for Pipeline Safety Regulation

Materials Transportation Bureau


Regulation Sections

Section Subject
192.201 Required capacity of pressure relieving and limiting stations