Rotary gas meters are positive displacement meters, designed to measure quantity of gas, for custody transfer or technical measurement applications. The devices are mainly applied for gas flow ranges from 0.2 up to 650 m3/h,and the presure range up to 20 bar. Special design rotary gas meters may also be used in higher pressure instalations.

The Rotary Gas Meters are applied in measurement systems were high accuracy is required:

• Transportation of natural gas
• Primary and secondary measurements
• Flow maesurement for technical purposes
• Control metering of natural gas and non aggresive technical gases in industry

GENERAL TECHNICAL DATA

p – basic, recommended
s – high speed version, smaller sizes, higher possible rangeability, higher noise level
w – low speed version, bigger sizes, smaller possible rangeability, lower noise level

• meter sizes: G16 up to G400
• nominal diameter: DN 40 up to DN 100
• meter body: Aluminium
• flow rate: 0,2 up to 650 m³/h
• flow directions: variable directions possible without any construction
• changes (see section 7: “Installation and operation recommendations”)
• rangeability: up to 1:250, depending on the meter size
• allowed medias: see table 2
• temperature range:
  
  • gas temperature -20°C to +60°
  • Cambient temperature -25°C to +70°C
• measurement accuracy: EU requirements and better
• guaranteed at least:
  
  • Qt – Qmax < ± 1%
  • Qmin – Qt < ± 2%

(tabel 2)

Qt – transition flow
Qt = 0,1 Qmax for rangeability 1:50
Qt = 0,05 Qmax for rangeabilities bigger then 1:50

table 2: Physical properties of most popular gases that may be measured with the Rotary Gas Meters - density at 101,325 kPa and at 20?C

DIMENSIONS

The main dimensions and weights of the Rotary Gas Meters are shown in table below.

(tabel 1)

Dimensions of the Rotary Gas Meters

(tabel 3)

p – basic, recommended
s – high speed version, smaller sizes, higher possible rangeability, higher noise level
w – low speed version, bigger sizes, smaller possible rangeability, lower noise level