Meter Run Characteristics - Honeywell HON R100NG Series User And Maintenance Manual

4.2 Meter run characteristics
Standards used as a basis
Conditions for the meter
run
User manual for HON R100 gas pressure regulator with HON P095NG pilot
No. Meaning
11 Vent line
12 Relief line
13 Blowdown line
Following is the meaning of the acronyms:
Acr. Meaning
DN Nominal size of pipe
L Undisturbed length of pipe
uR
* Shut‐off device with undisturbed flow pattern (ball valve) can be incorporated
The following recommendations are based on the measuring line connection conditions set
forth in standards (DIN) EN 334 and (DIN) EN 14382. The company operating the system is
the sole party responsible for the meter run working properly.
 A pipe area with a steady flow pattern must be selected for the sensing point. There
must not be any components that disturb the flow directly upstream and downstream
of the sensing point, e.g., orifice plates, expanders, bends, junctions, shut‐off devices,
etc.
 The flow rate at the sensing point should not exceed approx. 25 m/s, depending on the
system conditions.
 In the case of specific system circuits (such as gas regulating lines for gas engines) and in
the case of gas burners, flow rates higher than 25 m/s may be allowed following con‐
sultation with the manufacturer.
 Within a low‐pressure range of up to approx. 250 mbar, a maximum flow rate
of approx. 15 to 20 m/s is recommended at the sensing point. On a case‐by‐case basis,
and following consultation with the manufacturer, even lower flow rates may be al‐
lowed.
Basics for installing the device in a pipe
27