Flowserve NRG16-12 - Manual (Page 12)

2
Attention
■
The seating surfaces and threads on the vessel and mounting flange must be accurately
machined, Fig. 9
■
Use GESTRA PN 60 hat flange when applying the equipment in a high-pressure steam
boiler.
■
Do not bend the electrode tip when cutting.
■
Use only the supplied ring joint 27 x 32, form D, DIN 7603, .430, bright-annealed.
■
Do not lag the electrode body.
■
Do not insulate the threads with hemp or PTFE tape.
■
Do not apply conductive paste or grease to the electrode thread.
■
Provide a min. spacing of 4 mm between electrode and earth (flange, boiler wall),
Fig. 11, Fig. 12, Fig. 13, Fig. 14
■
Observe the minimum distances for the installation of the electrode, Fig 14
Installation
NRG 1...-12, step 1
. Screw electrode tip D into measuring electrode A , Fig. 6
2. Carefully determine required measuring length, taking minimum length into account.
3. Mark length of electrode tip
D .
4. Unscrew electrode tip D from measuring electrode A and cut tip.
5. Screw electrode tip D into measuring electrode A and tighten. Slide spring C along electrode tip
D , so that its bent end completely enters into small bore B .
6. If a measuring surface extension is required slip disk
E
onto electrode tip
D
ensuring that the
electrode tip protrudes 2 mm from the bottom of the disk. Fasten disk with set screw G .
Push star-lock washer F over electrode tip against disk.
NRG 1...-12, step 2
. Check seating surfaces, Fig. 9
2. Place joint ring H onto seating surface I of electrode, Fig. 7
3. Apply a light smear of silicone grease (e. g. Molykote ® ) to electrode thread J .
4. Screw level electrode into threads of flange provided on vessel and tighten with a 36 mm ring
spanner. The torque required is 160 Nm when cold.
Molykote ®  is a registered trademark of DOW Corning Corp., Midland Michigan, USA