Flowserve NRG 111-11 - Manual (Page 12)

12
Attention
■ The seating surfaces of the standpipe or the flange provided on the vessel must be
accurately machined, see fig. 6.
■ Do not bend electrode tip when mounting.
■ Use only ring joint (of stainless steel 1.4301) D 33 x 39 DIN 7603 supplied with the
electrode.
■ Do not lag electrode body above the hexgonal section.
■ Do not insulate electrode thread with hemp or PTFE tape.
■ The leakage path between electrode and flange (mass) must be at least 14 mm, fig. 5
■ Observe minimum distances and spacing dimensions when installing the electrode,
fig. 5
Installation
NRG 111-11, step 1
1. Screw electrode tip D into measuring electrode A. Fig. 3
2. Carefully determine required measuring length of electrode. Observe min. length, Fig. 2
3. Mark length of electrode tip D.
4. Unscrew electrode tip D from measuring electrode A and cut tip.
5. After visual inspection screw electrode tip D into measuring electrode A. Slide spring C along
electrode tip D, so that its bent end completely enters into small bore B.
6. Fit surface extension disk E to electrode tip end and make sure that electrode tip protrudes 2 mm
beyond the bottom of the surface extension disk. Fix the surface extension disk in this position with
the grub screw G. Push lock washer F over electrode tip end against surface extension disk E.
NRG 111-11, step 2
1. Check seating surfaces. Fig. 6
2. Place joint ring E onto seating surface F of electrode. Fig. 4
3. Apply a light smear of silicone grease G (e. g. Molykote ® 111) to electrode thread.
4. Screw level electrode into threads or flange provided on vesssel and tighten with a 41 mm open-end
spanner. The torque required is 475 Nm when cold.
Molykote ® 111 is a registered trademark of DOW Corning Corp., Midland Michigan, USA