The CGZW Orifice Flowmeters are designed for volume measurement of flowing gas, and may be used for the following purposes:

• custody transfer measurements of flowing gas,
• flow measurements in transmission and distribution gas pipelines,
• control measurements of flowing gas.

The operating principle is based on the pressure drop caused by a contraction.
Basing on the differential pressure of the flow the gas volume may be determined.

The CGZW Flowmeters are manufactured as single chamber fittings with removable orifice plate,
and appropriate meter tubes. The titting construction enables to access the orifice plate easily
and quickly for inspection and replacement. It is not necessary to disassemble and spread flanges.
One of characteristic features of the CGZW Flowmeters is easy control of Ieakages around
the orifice plate.

Technical data:

• Nominal diameters: from DN50 (2") up to DN400 (16")
• Pressure range: upto PN110
• Connections: welding neck or flanged
• Temperature range:
  
  • gas: -20°C ÷ +60°C
  • ambient: -25°C ÷ +70°C

The CGZW Flowmeter consists of three following assemblies:

• upstream meter tube,
• single chamber orifice fitting with removable orihce plate,
• downstream meter tube with two temperature wells.

The orifice fitting is provided with %" or %" NPT openings for measurements ofthe differential pressure, and one drain opening.
The tables below contain overall dimensions and weights of the CGZW Orifice Fitting (welding neck from both ends).

Dimensions and weights (welding neck version):

* Weights of the fitting with the orifice plate