Emerson Rosemount 1199, Reference Manual

Page: 68 / 104

minimize the number of weld passes. These best practices will decrease heat input
and help mitigate distortion.
3. Position the weld spud in the vessel hole, place heat sink and tack the housing in
place using the welding sequence shown in Figure 3-34 . Cool each section with a
wet cloth before proceeding to the next section.
WARNING
Do not place the seal in the lower housing prior to welding. Do not nick the inner
angled sealing surfaces of the weld spud where the gasket sits, shown in
Figure
3-34 , as any irregularities may cause leaks.
4. Weld the housing in place using 0.030- to 0.045-in. (0,762 to 1,143 mm) stainless
steel rod as filler in the beveled area. Using between 100 and 125 A, adjust the
amperage for 0.080-in. (2,032 mm) penetration. Allow time to cool between weld
sections. Weld should be cooled to 350 °F (177 °C) or less after each pass while
being cool to the touch is preferred. Use of a damp cloth or compressed air is
allowed if rapid cooling is desired. Repeat procedure on the outside of the tank.
Note
The number of weld passes should be kept to a minimum while maintaining tank
weld standards and process requirements. Additional weld passes are a significant
contributor to spud distortion due to additional heat input and added filler material
in beveled area of hole.
Figure 3-34: Installing the Weld Spud
Preparing the vessel hole Welding sequence
C
D
E
A
B
1.32
(34)
1 3
5
7
2 4
6
8
A. 100 to 125 A recommended
B. Heat isolation grooves
C. Weld spud
D. Bevelled edge
E. Process vessel
Dimensions are in inches (millimeters).
CAUTION
Excessive heat will distort the weld spud. Allow adequate cooling time between
passes.
Installation Reference Manual
May 2020 00809-0100-4002
68 Rosemount DP Level