Rosemount 1199, Reference Manual

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Reference Manual
00809-0100-4002, Rev BB
November 2012
3-15
Rosemount 1199
The flat area should be large enough to minimize spud distortion but small
enough so that tank weld requirements can be met. Minimizing the bevel
angle will decrease the amount of fill required during weld and minimize the
number of weld passes. These best practices will decrease heat input and
help mitigate distortion.
Welding
Ensure spud is not assembled to transmitter and/or remote seal prior to
welding.
Do not nick the sealing surfaces of the tank spud, the inner angled surfaces
where the o-ring sits shown in Figure 3-24, as any irregularities may cause
leaks.
Figure 3-24. O-ring Sealing
Surfaces
With the spud centered in the tank hole, make sure the inner surface of the
spud is flush with the inner surface of the tank. The leak detection hole in the
spud should be at the bottom of the spud. With the spud properly located, tack
weld it into place using 4 tack welds, 90º from each other.
Begin welding on the inside of vessel. Weld in sections similar to the
sequence in Figure 3-25.
Figure 3-25. Welding Sections
Diagram
Excessive heat will distort the tank spud. Allow adequate cooling time between passes.