Installation – Flowserve NRG16-41 User Manual
Page 14
4
Attention
■
The seating surfaces of the standpipe or the flange provided on the vessel must be
accurately machined, see
Fig. 7.
■
Do not bend electrode tip when mounting.
■
Use only ring joint (of stainless steel .430) D 7 x 3 to DIN 7603 supplied with
the electrode.
■
Do not lag electrode body above the hexagonal section,
Fig. 5.
■
Do not insulate electrode thread with hemp or PTFE tape.
■
Do not screw electrode directly into a screwed socket,
Fig. 6.
■
Observe min. spacing when installing the electrode, Fig. 6, Fig. 10, Fig. 11, Fig. 12
Installation
NRG 16-41, NRG 17-41, NRG 19-41, step 1
. Screw electrode tip
D
into measuring electrode
A
, Fig. 4.
. Carefully determine required measuring length of electrode. Observe min. length,
Fig. 2, Fig. 3.
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 end completely enters into small bore
B
.
Note
■
For the approval of the boiler standpipe the relevant regulations must be considered.
■
Refer to page 5 for three typical installation examples.
Tools
■
Open-end spanner A. F. 7 mm
■
Open-end spanner A. F. 4 mm
■
Hacksaw
■
Flat file, medium cut
NRG 16-41, NRG 17-41, NRG 19-41, step 2
. Check seating surfaces,
Fig. 6
. Place ring joint
E
supplied with electrode onto seating surface
F
of electrode,
Fig. 5
3. Apply a light smear of silicone grease (e.g. Molykote
®
) to electrode thread
G
.
4. Screw level electrode into threads of flange provided on vessel and tighten with
a 4 mm open end spanner. The torque required is
160 Nm when cold.
5.
When installing two electrodes together in one flange install the first electrode as described in 4.
Before mounting the second electrode undo plug
R, remove PE connection Q and strip cable lugs
from the board. Screw in electrode. Slightly tighten plug
R. Install PE connection Q and insert
cable lugs.
Molykote
®
is a registered trademark of DOW Corning Corp., Midland Michigan, USA