WELD REPAIRS ON NEW SUCTION ROLL SHELLS
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This TIP covers considerations for weld repairing new suction roll shells. It
has been shown that suction rolls fail in service due to a variety of causes,
one of which may be the discontinuity that is produced when a new shell is weld
repaired.
This TIP will serve two functions: (1) to acquaint the industry with factors
in weld repairs in suction roll shells that may influence the shell service
life, and (2) to provide a means whereby repairs in individual shells may be
documented and later compared with shell performance. It is beyond the scope of this TIP to provide criteria for rejection of new
shells based on the size or quantity of flaws. Further, this TIP does not
describe limits or manufacturing parameters on weld repairs that may affect the
serviceability of the roll. However, it is recommended that the matter of weld
repairs be negotiated between the purchaser and supplier at the time of ordering
a new shell. Welding that is performed on in-service suction roll shells in an
attempt to repair handling damage and fatigue cracks is also excluded from this
TIP.
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