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Q6 (10 Marks) Fire Protection & Detection 🔥 Repeated 4x in exams
SSEP • Written Exam

Define briefly the construction details peculiar to each of the following types of closure that enables their primary function to be fully realized;

(a) Water tight doors

(b) Fire proof doors

(c) Gas tight doors

(d) State why (a) can perform and function of (b) as well as of (c), whereas function of (b) and (c) are restricted solely to their primary function,

Appeared In: Apr 2023Sep 2019Jan 2019Aug 2018

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Define briefly the construction details peculiar to each of the following types of closure that enables their primary function to be fully realized;

Part (a)

Water tight doors

Part (b)

Fire proof doors

Part (c)

Gas tight doors

Part (d)

State why (a) can perform and function of (b) as well as of (c), whereas function of (b) and (c) are restricted solely to their primary function.

(Refer to the detailed answer for 679e38c210fccdd99a8a6012.)

Part (a)

Watertight doors: made of steel, fitted in a steel frame, with a gasket/sealing arrangement compressed by dogs (quick-acting clamps) or a wheel-operated mechanism to make a watertight seal; the door and frame are tested for watertightness and withstand the water pressure.

Part (b)

Fireproof (fire-resisting) doors: made of steel (or a fire-resisting material) with a fire-resisting core/insulation, fitted in a steel frame, with intumescent seals or a fire-resisting gasket that expands when heated; self-closing with a latch; tested to the fire-resistance standard (e.g. A-60, B-15).

Part (c)

Gas-tight doors: made of steel with a gas-tight seal (a gasket that seals the perimeter completely), fitted in a steel frame, with a clamping mechanism that compresses the gasket to make a gas-tight seal; tested for gas-tightness.

Part (d)

A watertight door, being made of steel with a full perimeter seal and a clamping mechanism, provides a complete, sealed closure that is also fire-resisting (steel) and gas-tight (the full seal prevents gas passage), so it can perform the functions of a fire door and a gas-tight door. A fire door is designed primarily to resist fire and smoke; it is not necessarily watertight or gas-tight. A gas-tight door is designed to prevent gas passage but is not necessarily fire-resisting to the required standard or watertight. Hence the fire door and gas-tight door are restricted to their primary function, whereas the watertight door can perform all three.

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