TECHNICAL MANUAL MT103
15
1
and
2
Connect to regulators heads
3
and
4
Connect to pilots
5
and
6
Connect to accelerator and slam-shut
The regulator must be installed in the line with
the arrow on the body pointing in the gas flow direction.
It is indispensable for good regulation that the position of the downstream pressure take-offs and the speed of the
gas at the take-off point respect the values given in tables 2 and 3 (positioning) and 4 (speed).
The pressure regulator, when installed on a reducing station, shall be installed at least according to the
requirements of standard EN 12186.
All venting connections shall be connected as required by above mentioned standard.
The following is recommended so as to prevent the accumulation of impurities and condensate in the lines
of the pressure take-offs:
a) the lines themselves must slope down towards the downstream piping connectors with a slope of about 5-10%;
b) the connectors on the piping must always be welded on the top of the piping itself and there must be no burr
or inward protrusions in the hole in the piping.
NB.WE RECOMMEND NOT TO PUT ON/OFF VALVES ON THE IMPULSE TAKE-OFFS
Tab. 3
DETAIL OF MULTIPLE TAKE - OFF WITH OF THE IMPULSE TAKE - OFF REFERENCE NUMBERS
Tab. 4
The speed of the gas must not exceed the following values in the piping downstream from the regulator:
Vmax= 30 m/s for Pa > 5 bar
Vmax= 25 m/s for 1 < Pa < 5 bar
3.0 ACCESSORIES
3.1 RELIEF
VALVE
The relief valve is a safety device which releases a certain quantity of gas to the exterior when the pressure at the
control point exceeds the set-point as a result of short-lasting events such as, for example, the very fast closing
of the on/off valves and/or overheating of the gas with zero flow rate demand. The release of the gas to the exterior
can, for example, delay or block intervention of the slam-shut valve for transitory reasons deriving from damage
to the regulator.
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