Metreg MQM - Page 11

11
DN Pressure class Flanges according DIN EN 1092-1
[mm] PN Hexagon screws and nuts
Min. operating Number Strength Strength
temperatur of of screws class class
the screws screws screws
and nuts
 25 16 -10°C 4xM12 5.6/8.8 5/8
 50 16 -10°C 4xM16 5.6/8.8 5/8
 80 16 -10°C 8xM16 5.6/8.8 5/8
 100 16 -10°C 8xM16 5.6/8.8 5/8
 150 16 -10°C 8xM20 5.6/8.8 5/8
DN Pressure class Flanges according DIN EN 1092-1
[mm] PN Hexagon screws and nuts
Min. operating Number screw screw
temperatur of of screws material material
the screws
and nuts
 25 16 -40°C 4xM12 25CrMo4 25CrMo4
 50 16 -40°C 4xM16 25CrMo4 25CrMo4
 80 16 -40°C 8xM16 25CrMo4 25CrMo4
 100 16 -40°C 8xM16 25CrMo4 25CrMo4
 150 16 -40°C 8xM20 25CrMo4 25CrMo4
During Installation of the meter has to been checked:
1. The meter is mounted in the right ow direction.
2. The meter is installed gas-tight.
3. The meter is installed stress-free.
•
Inhorizontalpipesthemeterisinstalledwiththeindexheadupright.
In case of vertical installations the oil pump must be mounted in upright position
  (ifthemeterisequippedwithanoilpump).
•
Connecting screws and nuts must be tightened crosswise.
•
Forconnectingthepressuretestpointpleaserefertochapter15.
•
Forconnectingthetemperaturetestpointpleaserefertochapter16.
A protective cover is recommended for outdoor installation especially when
the meter is mounted together with a volume corrector.
After installation of the meter: Welding of piping and anges nearby
the Quantometer is not allowed.