What straight-pipe lengths are required for Goldcard industrial gas flowmeters?

Straight-pipe requirements vary by product and the level of upstream flow disturbance.

For the TBQM Turbine Gas Flowmeter:

• Low-level disturbance: at least 2DN upstream and 1DN downstream
• High-level disturbance: at least 10DN upstream and 5DN downstream

For the TUS-W Ultrasonic Gas Flowmeter:

• At least 10DN upstream and 5DN downstream

For the TUF Ultrasonic Gas Flowmeter:

• One-way measurement: at least 5DN upstream and 3DN downstream
• Two-way measurement: at least 10DN upstream and 10DN downstream

Actual requirements may also depend on meter accuracy, acoustic-path configuration, flow conditioners, elbows, valves, reducers, and other upstream disturbances.