(a) After the economiser has been cleaned, the Dy. Director shall make a thorough examination so far as its construction permits. The external condition of the tubes shall be carefully noted for wasting especially at the feed inlet end and all accessible tubes shall be calipered. The internal surfaces of cast iron tubes shall be calipered as far as possible and shall be closely observed for graphitic wasting. In the event of any failure, these shall be broken up for scrutiny, so that the general internal condition of the other tubes may be estimated.
(b) Where tubes or other parts are wasted, the strength shall be recalculated.
(c)The scraper gear shall be examined to note if any parts are missing, if the length of travel is adequate and if the scrapers are correctly adjusted.
(d) All cap bolts are to be inspected, also the condition and position of the damper and baffles.
(e) The record of each inspection and calculation shall be entered in the memorandum of Inspection Book.