Cameron Scanner 3100 EFM - Flow Rate and Fluid Property Calculations

Flow Rate and Fluid Property Calculations
The Scanner 3100 calculates ow rates and uid properties for natural gas and liquid ow in accordance with the fol-
lowing industry standards. The calculations compensate for the effects of pressure, temperature, and uid composition to
determine mass and volume at specied base conditions. The uid corrections typically require conguration of inputs
including static pressure and temperature. The ow calculation requires conguration of differential pressure or pulse
(frequency) inputs.
Table 1.4—Flow Rate Standards
Standard Description Orice NuFlo Cone Linear Pulse Output Venturi
AGA 3
(1992)
The Scanner 3100 supports the orice metering calculations described in AGA
Report No. 3 (1992). This meter covers pipe sizes of nominal 2-in. and larger;
there is no stated maximum limit, but the largest size listed in the standard is
nominal 36 inch. Beta ratio must lie between 0.1 and 0.75. The AGA 3 orice
meter can be used to measure natural gas and liquids.
♦
AGA 3
(2012)
The Scanner 3100 supports the orice metering calculations described in
AGA Report No. 3 (2012). The AGA 3 orice meter covers pipe sizes of
nominal 2-in. and larger; there is no stated maximum limit, but the largest size
listed in the standard is nominal 36-in. Beta ratio must lie between 0.1 and
0.75. The 2012 report offers an improved expansion factor correction and is
recommended for use except where contractual or regulatory requirements
specify the 1992 standard. The AGA 3 orice meter can be used to measure
natural gas and liquids.
♦
ISO 5167-2
(2003)
ISO 5167-2 describes the measurement of natural gas and liquids with an
orice meter using pipe sizes of nominal 50 mm (2 in.) to a maximum of 1000
mm (39 in.). Beta ratio must lie between 0.1 and 0.75. In ASME MFC-3M
(2004), the ISO-5167 orice ow calculation was adopted without modication.
The ISO orice meter can be used to measure natural gas and liquids.
♦
ISO 5167-4
(2003)
ISO 5167-4 provides information for calculating ow rates with Venturi tubes.
It is applicable only to Venturi tubes in which the ow remains subsonic
throughout the measuring section and where the uid can be considered
as single-phase. In addition, each of these devices can only be used within
specied limits of pipe size, roughness, diameter ratio and Reynolds number.
ISO 5167 4 is not applicable to the measurement of pulsating ow. It does not
cover the use of Venturi tubes in pipes sized less than 50 mm or more than
1200 mm, or for where the pipe Reynolds numbers are below 20000.
♦
ASME
MFC-14M
(2003)
For low ow applications, the Scanner 3100 supports the small bore orice
described in ASME MFC-14M for use with nominal 1/2-in. to 1-1/2-in. pipe
sizes. Beta ratio must lie between 0.1 and 0.75. The ASME small bore orice
meter can be used to measure natural gas and liquids.
♦
AGA 7 (2006) AGA 7 provides the measurement standards used to calculate natural gas
ow rates from linear pulse output meters, including turbine meters, vortex
shedding meters, pulser-equipped positive displacement (PD) meters, Coriolis
meters having volumetric pulse output, and other types. Linear pulse output
meters can be used to measure natural gas and liquids.
♦
Miller
Handbook,
Third Ed.
Richard Miller’s Flow Measurement Engineering Handbook provides denitive
information on selecting, sizing, and performing pipe-ow-rate calculations,
using ISO and ANSI standards in both SI and US equivalents. This reference
also presents physical property data, support material for important uid
properties, accuracy estimation and installation requirements for all commonly
used ow meters.
♦
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Scanner 3100 EFM Section 1