Honeywell HON 512 User And Maintenance Manual page 41

Gas pressure regulator with hon 650 pilot

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Downstream of the

sensing point

Details

HON 512 with HON 650 pilot user manual

Depending on the specific system design, the L

stream of the sensing point must be (1.5 to 4) x DN of the pipe:

Undisturbed length of pipe

min. 1.5 x DN

min. 3 x DN

min. 4 x DN

▪ Shut-off devices with an undisturbed flow pattern (such as full bore ball valves) and, if

applicable, pipe bends (depending on the design) are considered to be non-disturbing

elements in terms of measuring impulse line connections.

▪ For gas meters (turbine gas meters including quantometers, ultrasonic gas meters, and

vortex flow meters, but NOT rotary piston gas meters), there are no restrictions in terms

of measuring impulse line configurations, as these meters are not considered to be

flow-disturbing within this context.

▪ The following applies to rotary piston gas meters: Minimum distance between gas

pressure regulator or reducer / expander and gas meter: L

▪ Measuring impulse line connections downstream of gas meters must be at a distance of

min. 2 x DN.

▪ If shut-off valves are used (reduced bore), the recommended distance downstream of a

measuring impulse line is L

▪ Gas meter pressure losses must be taken into account based on system conditions if

applicable.

Basics for installing the device in a pipe

lengths of the undisturbed pipes down-

for

Thermowells

Reducers and expanders, depending on the

specific system conditions

Shut-off devices (gate valves, check valves, and

reduced bore ball valves)

Tees

min. 3 x DN.

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