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Reg. 246, Reg. 247, Reg.
248, Reg. 249
Steel Castings |
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Steel castings for pressure parts shall comply with Regulations 73
to 80 (28 to 35
tons per sq. in).
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Reg. 247
FUSION WELDED DRUMS
Definition of term ‘Fusion Weld'
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The term ‘Fusion Weld’ is, for the purpose
of this Chapter, applicable to all welded joints made
by the metal arc process with covered electrodes or
other electric arc process in which the arc stream and
the deposited weld metal are shielded from atmospheric
contamination.
It is intended that this Chapter shall apply to the
single run or heavy run welding process and that welded
boiler drums manufactured by that process shall conform
with all Regulations of this Chapter, excepting those
in which divergence is necessary solely because of special
requirements essential for the most efficient utilization
of that process. Thus all Regulations governing quality
of material, construction workmanship and testing (both
non-destructive and otherwise) are applicable.
When welded drums ordered to this chapter are made by
this single run or heavy run process it will be understood
that Regulations 252 and 267 do not apply in their entirety.
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Reg. 248
Equipment of Workshop
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a)
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The welding plant
and equipment are to be of good quality and maintained
in an efficient working condition. The welding apparatus
is be installed under cover and arranged so that the welding
work may be carried out in positions free from draughts
and adverse weather conditions. The procedure is to be
such that there is regular and systematic supervision
of the welding works, and the welding operators are to
be subjected by the works officials to periodic tests
for quality of workmanship. Records of these tests are
to be kept and are to be available to the Inspecting Officers
for scrutiny. |
| b) |
The Works should be
equipped with an efficient testing laboratory which should
include apparatus suitable for carrying out tensile, bend
and impact test micro-examination of specimens and X-ray
examination of the actual joints in pressure vessels.
The Works should also be equipped with a suitable heat
treating furnace having satisfactory means for temperature
control, but as an alternative arrangements may be made
whereby the drums can be heat-treated elsewhere. |
Reg. 249
Constructional details and preparation for welding
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The manufacturer shall supply the Inspecting Authority
with a fully dimensioned sectional drawing showing in
full details the construction of the drum(s) for approval
before putting the work in hand.
Fully dimensioned drawings of the proposed welds preparations
of the main seams drawn to a scale which clearly shows
all the relevant details shall be furnished.
Sketches showing details of the welds preparations for
the attachment of the stand pipes, branch pipes and
seatings and their locations relative to the longitudinal
and circumferential seams and to other openings shall
be furnished.
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