Section 6 Control engineering systems
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Ships, July 2022 - Part 7 Other Ship Types and Systems - Chapter 7 Burning of Coal in Ships' Boilers - Section 6 Control engineering systems

Section 6 Control engineering systems

Parent topic: Chapter 7 Burning of Coal in Ships' Boilers

6.1 General

6.1.1 The requirements of Pt 6, Ch 1 Control Engineering Systems are applicable. The additional requirements for boilers which are coal grate-fired and under normal operation are remotely controlled or are automatic in operation, are given in Table 7.6.1 Coal burning: Alarms and safeguards.

6.1.2 In general, ships complying with the relevant requirements of Pt 6, Ch 1, 4 Unattended machinery space(s) - UMS notation or Pt 6, Ch 1, 5 Machinery operated from a centralised control station - CCS notation will be eligible for the notations UMS (unattended machinery space) or CCS (centralised control station) respectively.

Table 7.6.1 Coal burning: Alarms and safeguards

Item Alarm Note
Drum water level Low Combustion air; coal spreaders and/or any alternative fuel supply to be shut-off automatically
Daily service
hopper level 		High/Low 末
Coal feed plant Failure 末
Primary
combustion air
system 		Failure Coal spreaders to be stopped automatically
Secondary
combustion air
system 		Failure 末
Coal supply
controller (if
separate from
spreader) 		Failure Per controller
Spreader drive Failure/ Overload Per drive. See also primary combustion air system failure
Grate drive Failure/ Overload Per drive
Localised
overheating of
the grate 		Excessive 末
Induced draught
fan 		Failure Coal spreaders to be stopped automatically, see also Pt 7, Ch 7, 3.2 Forced and induced draught air fans 3.2.2
Ash disposal
system 		Failure 末

Note Interlocks are to be provided to prevent the burning of fuel oil, unless dampers in the gas passages of uptakes have been securely locked in the fully-open position, see also Pt 7, Ch 7, 3.4 Alternative means of firing 3.4.2.

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