Patent GB-711578-A (GB)
Title: Improvements relating to the ventilation of oil tankers
IPC: B63J2/10
Filed: 1952-05-13
Abstract: 711,578. Ventilation. STERLING & CO., Ltd., R. B., and LAMB, J. Feb. 12, 1953 [May 13, 1952], No. 12113/52. Class 137 The air in the crew's or other quarters of an oil tanker is freed from volatile hydrocarbons during the loading or unloading of the tanker. Air is induced by a fan v, Fig. 5, driven by motor 3 to flow through the offshore one of a pair of inlets r', through the corresponding duct r to an antechamber p. After passing through viscous oil filters t, Fig. 1, the air enters a sheet metal chamber a containing two treating compartments b, b<SP>1</SP> arranged one above the other and extending the full width of the chamber, the purified air then passing through outlet u past fan v and outlet w to the trunking 16 which may contain an air heater 29. Each compartment b or b' is spaced from the front, top and rear of the chamber a to form a passage c and has front openings d which are closable by a pair of valves e pivoted in the chamber casing and operable by levers f. The bottom n of each compartment is inclined at an angle of about 15 degrees to the horizontal and forms a removable manifold plate having a plurality of flanged holes therein which receive the spigotted ends of canisters g each of which comprises an outer and an inner perforated cylinder between which activated carbon is packed, a top cap closing both cylinders and a bottom cap closing the bottom of the outer cylinder and providing the spigot which forms an extension of the inner cylinder. Locking bars o pivoted to the casing engage the top caps of the canisters g or in a modification, the canisters have bottom spigots which screw into flanges projecting above the holes in the manifold plate the locking bars being omitted. When at sea the carbon in the canisters is reactivated by steam under pressure supplied through two inlets 5, a pressure relief valve 6 being provided in antechamber p. The floor 7 of chamber a is inclined downwardly to a trough 8 and valve 9 to drain away condensed steam. During the reactivation the outlet u is closed by a valve y, the air intake ducts r are closed by valves 4 and a valve z in a casing x is opened to allow air to flow through inlet 2 and casing x direct to the crew's quarters. After shutting off the steam the carbon is dried by two groups of steam heated pipes 10, a pair of doors 15 being opened to allow the escape of saturated air. For normal ventilation of the crew's quarters the valve z is closed, valves 4 and y are opened and valves e moved to close the openings d and open the passages c, the air then flowing through ducts r, antechamber p, viscous oil filters t, bye-pass c, outlet u and fan outlet w, to the ducting 16. For normal ventilation of the boiler and engine rooms respectively, two pairs of fans 17, 18, are provided which force air through trunking 19 provided with a fire emergency shut off valve and a change over valve. For treating the air when in port, the change over valve is operated, the incoming air then passing through antechamber p', air flow chamber a<SP>1</SP> and outlet 24 back into the trunking 19, each chamber a<SP>1</SP> being similar to that a except that a bye-pass c is not provided. Isolating valves such as 25 are closed whilst normal ventilation takes place and blanking off plates 27 are inserted in trunking 23 when using steam for reactivating the carbon.