Maintenance - Madas FRG/2MC Manual

5.0 - MAINTENANCE

• Before carrying out any dismantling operation on the device, make sure that there is no pressurised gas inside.
Check the condition of the filtering element (21) as follows
• Loosen the fastening screws (17) and very carefully remove the bottom cover (16) from the body (11);
• Extract the filter element and check its conditions. Blow it and clean it and, if necessary, replace it (see figures "a" and "b"
below for the positioning);
• Check the conditions of the sealing O-Ring of the bottom cover (16) and replace if necessary;
• Make sure the sealing O-Ring (18) of the bottom cover (16) is inside the relevant groove before putting it back on;
• Reassemble the bottom cover (16) and secure it in its original position, being very careful not to "pinch" or damage the
O-ring during tightening.
IMPORTANT:
1. for DN 15 ÷ DN 50 connections make sure that the centre pin (10) is centred in the guide of the bottom cover (16);
2. for DN 65 - DN 80 - DN 100 connections pay attention to the Teflon split ring (14): when reassembling the bottom
cover (16) it must be placed inside the specific guide (as shown in figure 6);
• Tighten the screws gradually, following a "cross" pattern, until the torque (tolerance -15%) indicated in table 2 on page 41
is reached. Use a calibrated torque wrench to do this.
• Check the body/cover seal;
NOTE: for internal inspections, it is recommended to:
• Also check the obturator's integrity and, if necessary, replace the rubber seal (15);
• Replace the seals before reassembling.
• It is recommended to contact the Technical Department to check or replace the membranes.
fig. a: DN 15 ÷ DN 50 cover without bottom cover
Filter element guides
The filter element must be
placed inside these guides
Madas Technical Manual - REV. 0 of 10 May 2018
th
fig. b: DN 65 ÷ DN 100 cover without bottom cover
Filter element guides
The filter element must be
placed inside these guides
15
RG/2MC - FRG/2MC