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CAUTION – The Model 851F is shipped with a
Protective cover over the flush diaphragm. Do
not damage the diaphragm after removing the
cover.
To install the Model 851F, the adapter coupling
must be welded to the customer's pipe @ pipe
flange, or other fitting. Figure 2-3 shows some
suggested installations and lists suggested pipe
sizes, wall and flange thicknesses and hole
sizes. The installation procedure is as follows:
1. Cut hole for adaptor coupling.
2. Thread plug into the coupling (Figure 2-3)
until it bottoms. Do not use the gasket.
FIELD WIRING
CONDUIT DRAIN
(TO PREVENT MOISTURE
BUILD-UP IN FIELD
TERMINAL COMPARTMENT)
NOMINAL
PIPE SIZE
2
1
2
2
3
3
1
2
4
5
6
8
10
12
14
16
18
20
24
30
T
ADAPTOR
COUPLING
D
W
WELDED TO PIPE
2 1/2" SCHEDULE 40 ILLUSTRATED
MAX WALL
PIPE
PLUG
"W"
SCHEDULE
.154
40
.276
80
.300
80
.318
80
.437
120
.500
120
.562
120
.718
120
.718
100
PLUG IS INSTALLED IN COUPLING:
----------
.750
.750
80
a) WITHOUT A GASKET TO PREVENT DISTORTION
----------
.750
WHILE WELDING COUPLING
.750
80
b) WITH A GASKET TO SEAL COUPLING
----------
.750
WHEN TRANSMITTER IS REMOVED
.750
----------
----------
.750
3. Position the coupling so that the inside face
is approximately flush with the inside
surface of the customer's pressure vessel
and tack weld the coupling to hold in place.
4. With the plug still in the coupling, weld a
1/8" fillet all around the coupling. The plug
minimizes the distortion of the coupling
due to the welding operation.
5. Remove the plug.
6. Install the gasket into the coupling (Figure
2-3). Insert the Model 851F into the
coupling by screwing the threaded retainer
(part of the Model 851F) into the coupling
until the gasket just starts to compress.
Tighten the retainer another 1/6 revolution
(one hex flat).
D
WELDED TO COMMERCIAL PIPE FLANGE
(6" - 150# FLANGE ILLUSTRATED)
WELDED TO COMMERCIAL 1 1/2"
SOCKETED FITTING
(G & W BONNEY FORGE
3000# 1 1/2" TEE ILLUSTRATED)
WELDED TO COMMERCIAL 1 1/2"
(G & W BONNEY FORGE 3000#
1 1/2" "SOCKOLET" ILLUSTRATED)
NOTES:
" D " = 1.915 DIAMETER HOLE BY CUSTOMER
" T " = .750 MAX
" W " = SEE TABLE
VIEWS SHOWN WITH MODEL 88 FLUSH
BUT SIMILAR FOR THE 851 FLUSH
D
T
WELDED TO TANK WALL
T
WELD FITTING
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