Section 10 Bunkermasts

10.1.1 A bunkermast is a device consisting of a movable mast or jib provided with cargo lines intended for loading or discharging oil products from the cargo tanks such as diesel oil, fuel oil, petroleum crude oil, petroleum distillates, lubricating oil and bilge water.

10.1.2 The structure of bunkermasts is not covered by this Section. Approval of the structure and structural components of bunkermasts is to be dealt with by the competent authority or inspection body. When authorised, LR is prepared to issue a statement of compliance with a Recognised Standard. Alternatively, upon special request, the bunkermast could be considered for equivalence with the requirements as contained in the Code for Lifting Appliances in a Marine Environment.

10.2.1 This Section applies to pedestals for bunkermasts.

10.2.2 Pedestals, in general, are to be carried through the deck and satisfactorily scarphed into the hull or main support structure. Proposals for other support arrangements will be specially considered.

10.2.3 The pedestal flange in way of the slew ring bearing is to be designed and be of a thickness to provide a rigid and level support for the bearing and bolting. Tolerances and arrangements proposed by the slew ring bearing manufacturer are to be adhered to.

10.2.4 Where it is considered necessary to introduce stiffening brackets to support the flange the spacing of the brackets is to be not greater than that achieved by positioning them between every second bolt.

10.2.5 The pedestal is to be designed with respect to the worst possible combination of loads resulting from the bunker crane self weight, loads from attached hoses and internal piping fully filled with oil, bunker crane accelerations together with loads resulting from the ship’s heel and trim if anticipated to be greater than 5° and 2° respectively.

10.2.6 In the design of the pedestal, the following allowable stresses should not be exceeded:

Bending stress

Shear stress

where

10.3.1 Underdeck spaces in which the swivel mechanism is located are not to be open to cargo tanks, unless the cargo list of the ship is restricted to products mentioned in Pt 4, Ch 6, 10.1 General 10.1.1 only.

10.3.2 Underdeck or enclosed spaces in which the swivel is located are not to be permanently open to cofferdams or double bottom spaces and are to be accessible for inspection purposes under all service conditions. The dimension of the access opening is to comply with Pt 4, Ch 4, 3.2 Hold spaces, cargo tanks and service spaces 3.2.6. This opening is to be closed by a removable manhole cover or hatch provided with adequate sealing arrangements.

10.3.3 Underdeck or enclosed spaces in which the swivel mechanism is located are to be provided with sounding and independent drainage arrangements.