Madas RG/2MCS - 4.0 - MANUAL RESET; 5.0 - FIRST START-UP

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Madas Technical Manual - 5|5.2a - REV. 0 of 
th
Apr 2019RG/2MCS - RG/2MBZ
piping
applicaon
discharge in open air
discharge in open air
1
2
3
6
5
7
8
4
internal thermal unit
non-hazardous venlated zone*
external roof
EXAMPLE 2 (RG/2MBZ)
1. Expansion joint/anti-vibration mount
2. Upstream ball valve
3. RG/2MBZ pressure regulator
4. Ball valve downstream of the regulator
* if the zone is ATEX classified follow the indications of 3.3
4.0  MANUAL RESET
• Make sure that all valves and downstream taps are closed;
• Unscrew the cap (11);
• Lightly press the reset pin (29), wait a few moments for the pressure to balance and then fully press the reset pin (29);
• Hold down the reset pin (29), slowly open the valve downstream of the regulator;
• Release the reset pin (29);
• Then tighten the cap (11) back in the initial position.
5.0  FIRST STARTUP
Before commissioning, verify that:
• all of the instructions on the rating plate, including the direction of flow, are observed;
• the holes of the dust caps (12) and (24) are not clogged (regulator and shut off);
• IMPORTANT: The leak test of the piping must be performed without subjecting the diaphragm of the regulator
(therefore, the downstream pipe section) to a pressure higher than 300 mbar (for reinforced diaphragm 1.5 times
the regulator setting pressure). Use special manual gas closing devices to avoid damaging the regulator;
• The pressurisation manoeuvre of the equipment must be carried out very slowly so as to avoid possible damage.
NOTE: under no circumstances should a blind cap be installed in place of dust caps (12) and (24) as the
regulator and/or the safety shut offs may not work;
• Close the ball valve downstream of the regulator and partially open the downstream relief valve;
• Slowly open the upstream shut-off devices;
• Close the vent valve;
• Proceed by manually resetting the regulator (see 4.0);
• Close the downstream valve so as to close the regulator (the Pa value increases the SG value to fully close the obturator);
• Check the tightness of the system seals and check the internal/external tightness of the regulator, of the relief valve and of
the external sensor tube, if applicable;
• Slowly open the downstream valve and the shut-off valve;
• Check the operation of the regulator.
5. Vent valve
6. MVS/1 relief valve
7. Low pressure gauge and relative button
8. High pressure gauge and relative button
Ø ext. min 8mm
Ø int. min 6mm
5 DN