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Glossary

Gas pressure regulation and safeguarding

AC
acronym:Accuracy class
AG
acronym:Accuracy group
AW
acronym:Deviation of response pressure
bpu
Inlet pressure range
CSPRS
Controlled safety pressure relief systems
CTP
Combination of pressure tests
d
Pipework diameter
d
Relative density (air = 1, without any dimension)
d
Downstream
DN
Nominal size (inlet or outlet)
DP
Design pressure (d: downstreaming, u: upstream)
f
Relative deviation of gas pressure regulation
F
Setpoint spring
Fs
Loading pressure
GDR
Acronym: gas pressure regulator (German: Gasdruckregelgerät)
Hi,n
Calorific value
Hs,n
Fuel gas value (gas burning)
i
Actual pressure
K
Acronym: actuator (German: Kontrollgerät)
KG-value
Flow rate coefficient
Lpa
Sound pressure level
MIP
Maximum incidental pressure
MOP
Maximum operating pressure
OP
Operating pressure in the station
OPCO
Acronym: Over pressure cut-off safety slam-shut valve
p
Operating pressure
pb
Atmospherical pressure
pd
Outlet pressure
pdmax
Admissible maximum outlet pressure
pdo
Overpressure release
pds
Setpoint
pf
Lock-up pressure
pL
Incidental pressure
pm
Loading pressure
pM
Gas pressure (measuring point: gas meter)
PN
Nominal pressure (example: PN 16)
pn
Line gas pressure
PNd
Rated pressure (downstream)
PNu
Rated pressure (upstream)
PS
Maximum allowable pressure
PT
Test pressure
pu
Inlet pressure
pu max
Maximum inlet pressure
Q
Volumetric flow rate (or heating capacity)
QM
Volumetric flow rate (measuring point: meter)
Qmin
Minimum flow rate
Qn
Flow rate (m3/h)
r
Evaporation heat
Ri
Specific gas constant
S,Sb
Factor of safety
SAA
acronym:Safety auxiliary valve
SAE
Safety shut-off device
SSV
Safety shut-off valve (German: Sicherheitsabsperrventil - acronym: SAV)
SRV
Safety relief valve (German: Sicherheitsabblaseventil - acronym: SBV)
SEP
Sound engineering practice
SG
Lock-up pressure class
SRMCR
Safety related measurement control and regulation
STP
Strength test pressure
SZ
Class of lock-up pressure zone
T
Temperature
t
Temperature
ta
Actuating delay
tf
Closing movement (of the final control element)
tk, Tk
Critical temperature
tM
Gas temperature (measuring point: meter)
TOP
Temporarily operating pressure at monitor set-up in the station
ts
Maximum allowable temperature
tu
Gas temperature (measuring point: inlet)
tu
Gas temperature (measuring point: inlet)
u
upstream
UPCO
Under pressure cut-off safety slam-shut valve
W
Weight
Wd
Set range
Wdo
Setting range (overpressure)
Wds
Specific set range
Wdso
Specific set range (overpressure release: SAV)
Wdsu
Setting range (underpressure)
X
Control deviation
Xd
Difference between setpoint and actual pressure (on a controlled condition)
Xw
Difference between actual pressure and setpoint (on a controlled condition)
Z
Disturbance variable

Metering and data logging, recording, evaluation

DKZ
Rotary displacement meter
EC
Electronic corrector system, types EC
EMC
Measuring device, type EMC
ENCO
Volume meter, type ENCO: transmitter unit for meter readings
ERZ
Flow computer series, types ERZ
IG
Impulse generator
MRG
Microcomputer for tariff recording (German: Messwertregistriergerät)
PGC
Process gas chromatograph
PT
Resistance thermometer
TERZ
Electronic volumeters (example: type TERZ 94)
TRZ
Turbine meters (example: type TRZ 03)
USZ
Ultrasonic flow meters
WBZ
Vortex meters, type WBZ
WZ
Compact gas volume meters, type WZ 07

Automating

SCS
Acronym: station control system

Gas pre-heaters, gas filters

F
Gas filter types F, FG, FGP
GD
Cellular filter insert, type GD
PG
Gas pre-heater, type PG

Ball valves

KOC
Bi-directional threaded ball valve
KOK
Bi-directional flanged ball valve

Gas flame arresters

FDS
Acronym: Gas flame arresters (German: Flammendurchschlagsicherungen)

Gas pressure regulating and metering stations

UKA
Acronym: Underground gas control module (German: Unterirdische Kompaktanlage)

Gas filling stations (CNG)

CNG
Compressed natural gas

Gas regulating units

BVn
Bi-directional flanged ball valve (example of a component)
RMG 906
Cellular filter, type RMG 906 (example of a component)

Odorizing systems

GOE
Gas odorization unit, type GOE
OSG
Pulse control unit

Gas expansion turbines

MTG
Type MTG: radial turbine with vane adjustment
to product flash