OILINJECTION COUPLINGS FOR TANKER1977 Industrial Lubrication and Tribology
doi: 10.1108/eb053137
THE SKF oil injection couplings type OKHB, are compact and easy to mount and have been very much appreciated in the shipbuilding industry. Some propeller shafts have to be moved astern during inspection and maintenance and are, therefore, constructed without flanges. The interference fits which join the sections of the shaft systems must be very secure, as they are subjected to considerable torque. One SKF oil injection coupling, the OK 750 HB, per shaft system is used in the world's largest tanker, the 550,000 dwt Batillus. As each coupling is subjected to a maximum torque of 3,000 kNm but is able to transmit 11,000 kNm the safety factor is more than satisfactory.
The molecular structure of sulphonatesANAND, K.S.; ANAND, O.N.; SINGH, M.M.
1977 Industrial Lubrication and Tribology
doi: 10.1108/eb053138
MODERN heavyduty motor oils are almost invariably formulated with detergentdispersant type of additives. The types of additive normally employed for this purpose are organometallic detergentdispersants such as metal salts bariumcalcium of alkyl phenols, petroleum and synthetic sulphonic acids, condensation products of olefins and P2S5, alkyl salicylic acids, etc., on the one hand, and the polymeric ashless types of dispersants such as polymethacrylic esters and Nsubstituted long chain alkyl succinimides, on the other. Barium and calcium salts of the petroleum sulphonic acids, however, are by far the most widely used dispersantdetergent additives. These additives are manufactured from the sodium salts or the sulphonic acids obtained as a byproduct during the sulphonation of mineral oils for the manufacture of white oils and transformer oils. The average molecular weight of the sodium salts is in the range 450500.