56.—(1) Every steam boiler at a mine and all its fittings and attachments shall—
(a)be cleaned out and examined internally as far as the construction thereof will permit at intervals not exceeding six months by a competent person appointed for that purpose by the manager; and
(b)be examined thoroughly at intervals not exceeding fourteen months by a competent person so appointed.
(2) No steam boiler which has been in use at the mine or elsewhere and which has received extensive repairs or been dismantled or been out of regular use for a period exceeding one month shall be taken into use at any mine for the first time at that mine unless immediately prior thereto it and all its fittings and attachments have been examined thoroughly by a competent person appointed for the purpose by the manager.