a) All cast iron and steel headers and the parts used
in the assembly of an economiser shall conform with
the requirements of this Chapter in respect of material
specification and test, workmanship and structural requirements.
(b) All economisers under construction shall be under
the supervision of an Inspecting Authority and must
be so certified by that Authority.
(c) A certificate from the Inspecting Authority in
Form VII certifying that the material was tested and
the economisers built under their supervision shall
be furnished to the Chief Inspector before or with the
first application for registration.
(d) In advance of or along with an application for
registration, the following shall be furnished-
(i) a certificate in Form VIII of manufacture and
test signed by the Maker or by a responsible representative
of the Maker, containing the description of the economiser,
particulars of the material used in its construction
and the dimensions of the several parts with the declaration
that the limits of tensile breaking strength and test
comply with the standard conditions.
(ii) A certificate from the maker of the material stating
the tensile breaking strength and the elongation provided
that if the Maker and manufacturer be the same, the
Manufacturers precise statement showing the above
information shall be accepted.
(e) To suit owners' convenience where possible it is
recommended that economisers be installed in two or