Class 2 (2nd Engineer) SSEP 📅 Jan 2018

Exam Question

(a) Describe the operating mechanism for a watertight door, which has provision for remote closure from the bridge and local operation.

(b) State the source of power for closure of electrical and the source of power for alarm and indicator

Reference Answer

(a) Operating Mechanism for a Watertight Door
In vessels with a large number of watertight bulkhead plates and access doors located below the waterline, a powered operating system is essential. Various systems are employed, primarily electrical and hydraulic types. A circuit diagram for a hydraulically operated system is commonly provided.
Hydraulic System Operation:
At each door, a motor-driven pump supplies oil at a pressure of 48 bar to a double-acting cylinder via a control valve .

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