Honeywell HON P095NG Series - Page 28

Basicsforinstallingthedeviceinapipe
UsermanualforHONR100gaspressureregulatorwithHONP095NGpilot  28
Dependingonthespecificsystemdesign,theL
uR
lengthsoftheundisturbedpipesupstream
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… and... then...
Agaspressureregulatorwithan
expanderthatispartofthe
deviceisused
Thenominalsizeofthepipeis
equaltotheoutlet‐sidenominal
sizeofthegaspressureregulator
L
uR
min. 2.5 x DN
Thenominalsizeofthepipeis
thenextlargerstandardnominal
size
L
uR
min. 3 x DN
Thenominalsizeofthepipeis
twostandardnominalsize
incrementslarger
L
uR
min. 4 x DN
Thenominalsizeofthepipeis
morethantwostandardnomi‐
nalsizeincrementslarger
L
uR
min. 5 x DN
Agaspressureregulatorwith
thesameoutletnominalsizeas
theinletnominalsizeisused
Thenominalsizeofthepipeis
thenextlargerstandardnominal
size
L
uR
min. 4 x DN
Thenominalsizeofthepipeis
twostandardnominalsize
incrementslarger
L
uR
min. 5 x DN

Dependingonthespecificsystemdesign,theL
uR
lengthsoftheundisturbedpipesdown‐
streamofthesensingpointmustbe(1.5 to 4) x DNofthepipe:
Undisturbedlengthofpipe for
L
uR
min. 1.5 x DN
Thermowells
L
uR
min. 1.5 x DN
Reducersandexpanders,dependingonthe
specificsystemconditions
L
uR
min. 3 x DN
Shut‐offdevices(gatevalves,checkvalves,and
reducedboreballvalves)
L
uR
min. 4 x DN
Tees

 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
uR
min. 3 x DN.
 Measuringlineconnectionsdownstreamofgasmetersmustbeatadistanceof
L
uR
min. 2 x DN.
 Ifshut‐offvalvesareused(reducedbore),therecommendeddistancedownstreamofa
measuringlineisL
uR
min.3xDN.
 Gasmeterpressurelossesmustbetakenintoaccountbasedonsystemconditionsif
applicable.


Upstreamofthesensing
point
Downstreamofthe
sensingpoint
Details