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Wednesday, 13 October 1971
Page: 2327

Mr Bennett asked the Minister for the Navy, upon notice -

(1)   Are pollution control devices planned for the Navy's new destroyers and other new craft?

(2)   If so, will these devices completely eliminate pollution sources from these ships?

Dr Mackay - The answer to the honourable member's question is as follows:

(1)   The new destroyers and other new naval vessels will cause considerably less pollution both to the atmosphere and to the ocean than existing ships.

(2)   lt is not possible to promise complete elimination but there will bc significant improvement as follows:

(a)   Gas turbines have the inherent advantage that they can be started from cold and placed on load almost immediately, with very little smoke emission. Such ships therefore do not emit the heavy clouds of smoke for an extended period as do present steam ships when raising steam in harbour. Also the gas turbines fitted in ships arc not as highly loaded as those in aircraft, where boost power, accompanied by smoke emission, is necessary on take off.

(b)   Silencers are fitted to gas turbines and internal combustion engine exhausts. This is a military requirement.

(c)   Sewage. AH new ships are planned to be fitted with on board sewage collection and treatment plants. Such plants are incorporated in the new destroyer design.

(d)   Garbage and waste. Garbage disposal units are fitted in all food handling areas in modern naval vessels.

(e)   Other waste is handled according to its pollution potential. Naval ships are subject to the same regulations against discharge of oil at sea or in harbour as commercial shipping. The Naval Board ensures that these regulations are strictly observed by the issue of appropriate directives to Commanding Officers, by the incorporation of appropriate safeguards during design and the use of up to date equipment, and by the provision of reception facilities for oily residue in major naval ports.

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