The uptakes shall be formed from weldless steel pipes
or from plate or strip rolled and electric resistance
welded or fusion butt welded pipes by electric arc process.
The tolerances on these pipes shall comply with the
requirements of Regulation
||As an alternative to riveting
the uptake may be fusion butt welded by the electric arc
process to the upward flange of the opening in the firebox
crown plate provided the conditions as to fusion welding
in Regulation 125
are observed. The edges of the upward flange and the adjacent
end of the uptake shall be beveled in accordance with
Fig. 3 or Fig. 4. The depth of the crown plate opening
from the commencement of the curvature of the flanging
radius shall be not less than twice the plate thickness
with a minimum of 1 inch. On completion of welding the
uptake and crown plate shall be effectively stress relieved
by heat treatment.
Where the firebox crown plate is also fusion welded to
the body of the firebox, the firebox complete with uptake
shall be effectively stress relieved by heat treatment
on completion of the welding.
||Welded uptakes shall be so
arranged that the weld is directly facing the longitudinal
centre line of the manhole.