Flowserve NRGT26-1 - Manual (Page 13)

3
Attention
■
The seating surfaces of the threads or flange provided on the vessel or boiler standpipe
must be accurately machined. Fig. 6
■
Do not bend electrode rod when mounting.
■
Do not lag electrode body.
■ Do not insulate electrode thread with hemp or PTFE tape.
Installation
NRGT 261
. Check seating surfaces of threads or flange provided on vessel or boiler standpipe. Fig. 6
2. Place joint ring C onto seating surface B of the electrode Fig. 7.
Use only joint ring (of stainless steel .430) D 27 x 32 to DIN 7603 supplied with electrode.
3. Apply a light smear of silicone grease (e. g. DOW Corning  Compound) to electrode thread
A.
4. Screw level electrode into threads or flange provided on vessel or boiler standpipe and tighten with
a 4 mm open-end spanner. The torque required is 160 Nm when cold.
NRGT 261S
. Check seating surfaces and place flat gasket on connection standpipe.
2. Place flange
E together with level electrode onto connection standpipe and secure with bolts.
Tighten bolts in diagonally opposite pairs. Fig. 5
Note
■ For the approval of the boiler standpipe with connecting flange the relevant local or
national regulations must be considered.
■ See four examples of installation on page 4.
Tools
■
Open-end spanner 7 mm A. F.
■
Open-end spanner 4 mm A. F.