Flowserve NRG 16-11 User Manual download pdf (Page 12)

Attention

■ The seating surfaces and threads on the vessel and mounting ﬂange must be accurately

machined, Fig. 8

■ Use GESTRA PN 160 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, 1.4301, 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 14 mm between electrode and earth (ﬂange, boiler wall),

Fig. 10, Fig. 11, Fig. 12, Fig. 13

■ Observe the minimum distances for the installation of the electrode.

Installation

NRG 1...-11, step 1

1. Screw electrode tip

D into measuring electrode A, Fig. 5

2. Carefully determine required measuring length, taking minimum length into account.

3. Mark length of electrode tip

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 sleeve

E onto electrode tip D ensuring that the

electrode tip protrudes 2 mm from sleeve. Fasten sleeve with screw

G. Push star-lock washer F

over electrode tip against sleeve.

NRG 1...-11, step 2

1. Check seating surfaces,

Fig. 8

2. Place joint ring

H onto seating surface I of electrode, Fig. 6

3. Apply a light smear of silicone grease (e. g. Molykote

111) 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

111 is a registered trademark of DOW Corning Corp., Midland Michigan, USA

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Flowserve NRG 16-11 User Manual Page 12