To provide air for the engines and for ventilationġ. In case the mast is not flooded up before the S/M goes deep the head valve is so constructed that it will lose buoyancy at 120 ft (keel depth), drop open and flood the mast. The external induction system is then flooded up (Flood and Drain Valve and Vents), and water is pumped from 'R' tank to compensate. To stop snorkelling, the Induction Hull Valve is shut, engines stopped, snorkel drains shut and the mast lowered. On starting the main engines the Induction Hull Valve is opened, and the mast fully raised. At the same time the engines are prepared. This is done by the Control Room Watchkeepers. On preparing for snorkelling, the induction system is drained down with the mast still below the surface. Should this fail it can be shut by hand either at the valve or at the engine platform. The Emergency Flap Valve is spring loaded and balanced and will shut if there is a rush of water down the mast (i.e. It can also be shut by hydraulic pressure from the Control Room in an emergency. The Induction Hull Valve can be operated from the Engine Room by hydraulic pressure or by hand. Thus the system can be prepared for use before the mast is fully raised. head valve shut) the external system can be drained into an internal tank by operating the Flood and Drain Valve, Snorkel Drains One and Two, and the mast vents. With the mast partly raised, and the submarine at periscope depth (i.e. The air vents from the top of the tank into the atmosphere of In the Snorkel Drain Tank which can be periodically pumped out. The final separation of the entrained water occurs Into the Snorkel Drain Tank via a hand-operated Emergencyįlap Valve.
Hull Valve, from where it passes through the pressure hull The air passes throughĪ Helix Drier & external pipe, to the Snorkel Induction (c) The system must be capable of quick shut-down in the event of detection.Īir enters the S/M via a periscopic mast fitted (b) To conduct the engine exhaust to the surface with minimum risk of flooding the engine. (a) To supply air to the diesel-generators when running at Periscope Depth. Surface and Snorkel Exhaust Systems (Fig. Please report any typos, or particularly annoying layout issues with the Mail Feedback Form for correction.ĬHAPTER 8 - INDUCTION AND EXHAUST SYSTEMS Each method creates errors that are compounded while encoding for the Web. In addition to errors we have attempted to preserve from the original, this text was captured by a combination of optical character recognition and human typist. Different browsers and fonts will cause the text to move, but the text will remain roughly where it is in the original manual.
In this online version of the manual we have attempted to keep the flavor of the original layout while taking advantage of the Web's universal accessibility. 'O' Class Submarines - Induction and Exhaust System, describes the intake of air and exhaust through snorkel and mufflers of the Oberon class submarines. 'O' Class Submarines - Induction and Exhaust SystemĬ.F.