API MPMS 14.3.2 2016 E2019

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侵权投诉

Date of Issue: January 2019

Affected Publication: API Manual of Petroleum Measurement Standards, Chapter 14.3.2, Orifice

Metering of Natural Gas and Other Related Hydrocarbon Fluids—Concentric, Square-edged Orifice

Meters—Part 2: Specification and Installation Requirements, Fifth Edition

Errata 2

Page 32, Section 6.5:

The equation (in SI units) should read:

( )

4.38 10

F OD E

L OD ID



× ××

= +



×ρ



where

L is the probe length (mm);

Fm is the virtual mass factor—a constant to take account of the extra mass of the cylinder due

to the fluid

surrounding it and vibrating with it. For a gas, Fm = 1.0 and for water and other

liquids, Fm = 0.9;

OD is the outside diameter of probe (mm);

ID is the inside diameter of probe (mm);

S is the Strouhal number, dependent on the Reynolds No. and shape of the cylinder, but can be

taken as 0.4

for worst case or 0.2 as suggested by API MPMS Ch. 8.

V is the velocity of fluid (m/sec);

E is the modulus of elasticity of probe material (kg/cm2);

ρ is the density of probe material (kg/m3).

The equation (in USC units) should read:

( )

1.205

F OD E

L OD ID



××

= +



×ρ



where

L is the probe length (inches);

Fm is the virtual mass factor—a constant to take account of the extra mass of the cylinder due

to the fluid

surrounding it and vibrating with it. For a gas, Fm = 1.0 and for water and other

liquids, Fm = 0.9;

OD is the outside diameter of probe (inches);

ID is the inside diameter of probe (inches);

S is the Strouhal number, dependent on the Reynolds No. and shape of the cylinder, but can be

taken as 0.4

for worst case or 0.2 as suggested by API MPMS Ch. 8.

V is the velocity of fluid (ft/sec);

E is the modulus of elasticity of probe material (psi);

ρ is the density of probe material (g/cc).

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标签： #PM #MS

摘要：

API MPMS 14.3.2 2016 E2019 是美国石油学会（API）发布的石油测量标准手册（MPMS）第14章第3.2节的最新合并版本，专门针对天然气和液体流量的孔板计量系统中的“同心直角孔板”进行详细规范。该标准融合了2016年原版与2019年勘误及更新内容，提供了孔板流量计在安装、操作、计算及不确定度评估方面的权威指南，适用于油气行业中的贸易交接和过程控制。文档重点涵盖了孔板几何尺寸要求、流动条件、压力变送器与温度传感器配置以及符合AGA（美国气体协会）报告No.3的流量计算方程。

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API MPMS 14.3.2 2016 E2019

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