Honeywell HON R100NG Series User And Maintenance Manual page 28

Gas pressure regulator with pilot

Table of Contents

Upstream of the sensing

point

Downstream of the

sensing point

Details

User manual for HON R100 gas pressure regulator with HON P095NG pilot

Depending on the specific system design, the L

of the sensing point must be (2.5 to 5) x DN of the pipe, with the specifics depending on the

gas pressure regulator model and whether or not there is a pipe expander downstream:

If ...

A gas pressure regulator with an

expander that is part of the

device is used

A gas pressure regulator with

the same outlet nominal size as

the inlet nominal size is used

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 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 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 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 line is L

min. 3 x DN.

 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 upstream

and...