
2 Installation and Commissioning
Manual TRZ 03· EN08 2018 September, 10th
30
2.2.3
Perforated-plate straighteners
There are the following options for flow straighteners:
RMG L1
– L3 perforated-plate straighteners RMG LP-35 perforated-plate
compying with ISO 5167-1 and DIN 1952 straightener
Features
ISO / DIN
L1 to L3
RMG LP-35
Hole diameter d
d
≤ 0.05 D
0.04 D
0.13 D
Plate thickness e
e
≥ d
e = d
0.13 D
Plate clearance a
0.5 D
≤ a ≤ 1 D
0.5 D
-
Opening ratio m
0.2
≤ m ≤ 0.4
0.3
0.6
Pressure loss, dyn.
Δp
5 - 15 (c²
ρ / 2)
2 - 15 (c²
ρ / 2)
In conjunction with RMG turbine meters, these flow straighteners fulfil the require-
ments of Technical Guideline G 13 and are approved under EU approval No.
D 81 / 7.211.10 for turbine meters.
2.2.4
Seals
It must be guaranteed that flange seals of RMG turbine meters do not protrude
from the flange into the gas line.
All seals approved as per AD2000-Regelwerk can be used depending on the re-
quirements for stability and reliability.
−
gaskets:
k
0
x K
D
= 20 x b
D
| k1 = 1,3 x b
D
[N/mm]
−
grooved seals:
k
0
x K
D
= 15 x b
D
| k1 = 1,1 x b
D
[N/mm]
−
spiral seals:
k
0
x K
D
= 50 x b
D
| k1 = 1,4 x b
D
[N/mm]
−
octagonal ring joint seal:
K
D
= 480 N/mm
2