weldi su sed and all sharp edges are ground smooth (see Figure 4.1).
Buttw eldsn eedn ot be ground flush but they must be ground smootht oa
rounded contour. Ag ood way to judge aweldistorun your fingerover it.
Sharp edges can be detected easily.A ll weld spatter mustb er emoved
(see Figure 4.2). Any sharpp rominence may result in as pot where the
film thicknessw ill be inadequatea nd noncontinuous, thus causing
premature failure.
Grind smooth
Round corners
Continuous fillet weld
Gap
Gap
Do
Don't
Inside of vessel
Weld
Inside of vessel
FIGURE 4.1
Butt welding is preferred rather than lap welding or riveted construction.
Clean
Grind smooth
Do
Don't
Weld spatter
Weld flux
FIGURE 4.2
Remove all weld spatter and grind smooth.
TABLE 4.1
Criteria for Tank Linings
1.
Design of the vessel
2.
Lining selection
3.
Shell construction
4.
Shell preparation
5.
Lining application
6.
Cureofthe lining material
7.
Inspection of the lining
8.
Safety
9.
Causes of failure
10.
Operating instructions
Corrosion of Linings and Coatings
70
CAT8247—CHAPTER 4—17/10/2006—14:32—SRIDHAR—XML MODEL B–pp. 69–174