Flowserve NRG 26-40 - Manual (Page 12)

2
Attention
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The seating surfaces of the threads or flange provided on the vessel or boiler standpipe
must be accurately machined. Fig. 4
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Do not bend electrode rod when mounting.
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Use only joint ring (of S.S. type .430) D 33 x 39 to DIN 7603 supplied with electrode.
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Electrode body must not be included in the thermal insulation of the steam boiler.
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Do not insulate electrode thread with hemp or PTFE tape.
Installation
NRG 26-40
Note
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For the approval of the boiler standpipe with connecting flange the relevant local or
national regulations must be considered.
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See four examples of installation on page 3.
Tools
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Open-end spanner mm A. F. 8
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Open-end spanner mm A. F. 4
Molykote ®  is a registered trademark of DOW Corning Corp., Midland Michigan, USA
. Check seating surfaces of threads or flange provided on vessel or boiler standpipe. Fig. 4
2. Place joint ring C onto seating surface B of the electrode Fig. 3.
3. Apply a light smear of silicone grease (e. g. Molykote ) to electrode thread D.
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.
5. When mounting two electrodes in one flange install the first electrode as described
under item 4. Before installing the second electrode loosen the plug M, unscrew PE connection
and remove cable connectors from circuit board. Screw in electrode. Slightly tighten plug M.
Install PE connection L, fix cable connectors.