<4. Installation>
4-7
IM 01C25W05-01EN
Mounting Direction
Fit the tank spud onto the tank so that the drain
outlet faces downward. Then carry out the
temporary welding at four points outside the spud,
making sure to keep the boundary of the inside
surface of the tank wall and spud flat. Also, set the
spud vertical against the tank wall, in order for the
transmitter to be installed correctly.
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Tank spud
Minimam liquid level
50mm
Drain hole
Tank
Welding
Center of tank spud
Figure 4.16 Mounting Tank Spud
Welding method and Cautions
• Welding work should start with the inside of
tank, then continue to outside.
• Before starting the welding work, cool the
welding part with dry ice and so on. The welded
part should be cooled down one welding part
after another.
• Set the welding heat level as low as possible to
avoid the deformation of the spud.
• Since the tank spud materials used are
SUS304, SUS316, and SUS316L, use the
welding stick material as follows;
Covered arc welding: D316L
Tig or Mig welding: Y316L
• Take care not to damage the O-ring sealing
part.
Finishing Welding Surface
Make sure that all the welded parts are ground
smooth and flat in a way that no dust is stuck to the
surface.
[Special Tools for Tank Spud Welding]
Yokogawa provides special tools exclusively
designed for the tank spud welding to make the
installation easily and effectively. These tools can
be ordered separately.
• Cooling tool.....reduces the strain on the spud
during welding process.
For extension length L = 52 mm:
Part No. 1J833A063-31
For extension length L = 102 mm:
Part No. 1J833A063-32
• Strain check gauge.....determines whether the
transmitter can be mounted.
For extension length L = 52 mm:
Part No. 1J833A063-41
For extension length L = 102 mm:
Part No. 1J833A063-42
Table 4.1
Tank Spud model code
Model
Suffix Code
Description
TS
. . . . . . . . .
Tank spud
Extension
length
-E . . . . . . . .
-F . . . . . . . .
-J . . . . . . . .
-K . . . . . . . .
2 inch (50 mm)
for ISO101.6 Clamp
4 inch (100 mm)
for ISO101.6 Clamp
2 inch (50 mm)
for ISO76.1 Clamp
4 inch (100 mm)
for ISO76.1 Clamp
Material
U. . . . . . .
V. . . . . . .
W . . . . . .
304 SST
316 SST
316L SST
Welding part
plate thickness
A. . . . .
B. . . . .
C. . . . .
16 mm
12 mm
8 mm
*:
For the overview of the tank spud, refer to Subsection
4.7.3.
Table 4.2
Mounting tool, Gasket, and o-ring
Item
Part No.
Description
Clamp
G9726AE
G9726AD
for ISO101.6 clamp
for ISO76.1 clamp
Gasket
F9500DZ
F9500DY
for ISO101.6 clamp
for ISO76.1 clamp
O-ring
F9271QK
F9995CB
for ISO101.6 clamp
for ISO76.1 clamp
*:
Observe the condition of the gasket when unscrewing the
clamp. If the gasket is worn away or changed its shape, it
must be replaced with new one.
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Figure 4.17 Clamp Overview
