FACTORIES AND MACHINERY (STEAM BOILER AND
UNFIRED PRESSURE VESSEL)
Regulation 45. Corrosive service conditions.
Where an unfired pressure vessel is to be subject to corrosive, abrasive or erosive conditions-
(i) the Chief Inspector may require that the scantlings of such vessel shall be increased
by an amount which he may deem appropriate before assigning and authorised safe
(ii) the Chief Inspector may require that a suitable lining shall be fitted to any part of such
vessel as he may specify before it is placed in service; and
(iii) an Inspector may require tell-tale holes to be drilled in the walls of such unfired
pressure vessel. Such holes shall be drilled to a depth not less than half the calculated
wall thickness less any corrosion allowance and shall be spaced not more than two feet
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