2.13.1. Telescopic steel jacks:
(1) On request, the employer shall provide the inspector with a copy of the drawings and informations concerning the ultimate capacity of the jacks, a table of the recommended capacities and the minimum length of penetration of the telescoping parts. He shall also be required to supply details of the joints of threaded parts used, the minimum lengths of thread engagement, the recommended methods of usage by the manufacturer and any other information that might affect safety.
(2) The calculation of jack capacity is based on the results obtained from tests carried out by an independent expert.
(3) The flanges at the jack extremities shall have a net bearing surface corresponding to the capacity of the jacks and in all instances shall have a minimum bearing surface of at least 100 cm2 and be at least 6 mm thick and made of material currently used.
(4) The length of the penetration of the top part of the jack into the lower part of the jack shall be at least equal to the sixth of the jack length.
(5) The penetration of the threaded portion in the jack shall be equal to 1.5 times the diameter of the tube.
(6) The manufacturer’s name or trade mark, the type of jack and the date of manufacture shall be legibly stamped on all jacks and detachable parts.
(7) The employer shall make sure that the defective parts are replaced by parts of the same quality as the original parts.
(8) The employer shall ensure that tests are made to check the capacity of the welding done on the jacks.