Nautilus Pipeline Company, LLC

Original Volume No. 1

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Effective Date: 04/05/2010, Docket: RP10-475-000, Status: Effective

First Revised Sheet No. 102 First Revised Sheet No. 102

Superseding: Original Sheet No. 102







(2) by correcting the error, if the quantity of percentage

of error is ascertainable by calibration, test, or

mathematical calculation, or if neither of the two

foregoing procedures are applicable,


(3) by relating the quantity of receipt or delivery to

receipts or deliveries during periods under similar

conditions when the measurement equipment was deemed

to have been registering accurately.


5.8 Electronic Natural Gas Measurement (EGM) Technical Requirements


(a) Accuracy. Where EGM is used, the system shall use

instruments designed to provide overall measurement accuracy

of +1.0% of flow, taking into account all the sources of

error, including calibrated span of instruments, linearity,

hysteresis, repeatability, ambient temperature, stability,

vibration, and power supply fluctuation. To achieve this

degree of accuracy, transmitters with a published accuracy

of +0.10% shall be utilized. Differential Pressure

Transmitters of a type that self-compensate for static

pressure effect or manufacturer's published compensation

factor shall be programmed into the flow computer (RTU).

All instruments shall operate on a temperature range of -30

degrees Fahrenheit to +120 degrees Fahrenheit and a non-

condensing relative humidity range of 0 to 95%. The RTU

shall be designed and installed to withstand mechanical

shock of at least 1 G, and neither Shipper nor Transporter

shall be held responsible for any accidental damage to the

equipment as a result of mechanical shock of over 1 G.