Friday, August 23, 2013

Regulations for Starting arrangements: Regulation Requirement Series

Regulation Requirement Series
"Engine Starting Arrangements"

3.1 Starting arrangements

3.1.1 Mechanical air starting

  • Air starting the main and auxiliary engines is to be arranged such that the necessary air for the first charge can be produced on board the ship without external aid.
  • The total capacity of air receivers is to be sufficient to provide, without replenishment, not less than 12 consecutive starts alternating between ahead and astern of each main engine of the reversible type, and not less than 6 consecutive starts of each main non-reversible type engine connected to a controllable pitch propeller or other device enabling the start without opposite torque.The number of starts refers to the engine in cold and ready-to-start condition.
  • When other users such as auxiliary engine starting systems, control systems, whistle etc. are connected to the starting air receivers of main propulsion engines, their air consumption is also to be taken into account.
  • Regardless of the above, for multi-engine installations the number of starts required for each engine may be reduced subject to the agreement of the Society and depending upon the arrangement of the engines and the transmission of their output to the propellers.
  • The main starting air arrangements for main propulsion or auxiliary diesel engines are to be adequately protected against the effects of backfiring and internal explosion in the starting air pipes. 
  • To this end, the following safety devices are to be fitted:

  1. An isolating non-return valve, or equivalent, at the starting air supply connection to each engine.
  2. A bursting disc or flame arrester in way of the starting valve of each cylinder, for direct reversing engines having a main starting air manifold at least at the supply inlet to the starting air manifold, for non-reversing engines.

  • The bursting disc or flame arrester above may be omitted for engines having a bore not exceeding 230 mm.Other protective devices will be specially considered by the Society.

3.1.2 Electrical starting

  • Where main internal combustion engines are arranged for electrical starting, at least two separate batteries are to be fitted.The arrangement is to be such that the batteries cannot be connected in parallel.
  • Each battery is to be capable of starting the main engine when in cold and ready to start condition.
  • The combined capacity of batteries is to be sufficient to provide within 30 min, without recharging, the number of starts required as per the section 3.1.1 (same as in the event of air starting).
  • Electrical starting arrangements for auxiliary engines are to have two separate storage batteries or may be supplied by two separate circuits from main engine storage batteries when these are provided. In the case of a single auxiliary engine, one battery is acceptable. The combined capacity of the batteries is to be sufficient for at least three starts for each engine.
  • The starting batteries are only to be used for starting and for the engine's alarm and monitoring.
  • Provision is to be made to maintain the stored energy at all times.Each charging device is to have at least sufficient rating for recharging the required capacity of batteries within 6 hours.

Watch out for the next post on Regulation Requirements for...
Boiler and its Ancillaries


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