The minimum instrumentation, alarms, and safety controls required for specific types of systems are listed in table 1 to § 62.35-50. The ABS Marine Vessel Rules (incorporated by reference; see § 62.05-2) required for engineering systems are also listed in table 1 to § 62.35-50.

1. (a) Safety limit controls must be provided in navigating bridge primary propulsion control systems. See § 62.35-5(c).
2. (b) Safety trip controls and alarms must be provided for all main boilers, regardless of mode of operation. See § 62.35-20(a).
3. (c) Loss of forced lubrication safety trip controls must be provided for main propulsion turbines and main propulsion diesel engines.
4. (d) Override of overspeed and loss of forced lubrication pressure safety trip controls must not be provided for main propulsion or generator steam or gas turbines, or diesel engines. See § 62.35-5(e)(2).
5. (e) Transfer interlocks must be provided for main propulsion systems capable of remote and local control.
6. (f) Semiconductor controlled rectifiers must have current limit controls.
7. (g) Interlocks must be provided to prevent the starting of engines or turbines while the jacking or turning gear, if installed, is engaged. See § 62.25-5(a).
8. (h) Main and remote-control stations, including the navigational bridge, must provide visual and audible alarms in the event of a fire in the main machinery space.
9. (i) Minimally attended and periodically unattended machinery plants must be provided with a personnel alarm that annunciates on the bridge if not acknowledged by the watch engineer. See § 62.50-20(b)(1).
10. (j) All automatic controls and alarms must be failsafe to the least critical consequence for the particular system. See § 62.30-1.

11. (k) The operating or tripped status of vital auxiliary boilers must be indicated at the ECC. See part 63 of this subchapter.

    Table 1 to § 62.35-50—Minimum System Monitoring and Safety Control Requirements for Specific Systems

    System	Service	Instrumentation	Alarm	Safety control	See alsoparagraph
    Main (Propulsion) boiler	ABS Marine Vessel Rules Part 4-9-6 tables 1A, 1B and 5A	ABS Marine Vessel Rules Part 4-9-6 tables 1A, 1B and 5A	ABS Marine Vessel Rules Part 4-9-6 tables 1A, 1B and 5A		(a)
    	Burner seating		Failure	Burner auto trip	(b)
    	Trial for ignition	Status	Failure	Burner auto trip	(b)
    				Manual trip	(b)
    	Low fire interlock	Status
    	Program control interlock	Status
    Main (Propulsion steam) turbine	ABS Marine Vessel Rules Part 4-9-6 table 2	ABS Marine Vessel Rules Part 4-9-6 table 2	ABS Marine Vessel Rules Part 4-9-6 table 2	Manual trip	(c), (d)
    Main propulsion, diesel	ABS Marine Vessel Rules Part 4-9-6 tables 1A, 1B and 5A	ABS Marine Vessel Rules Part 4-9-6 tables 1A, 1B and 5A	ABS Marine Vessel Rules Part 4-9-6 tables 1A, 1B and 5A	Manual trip	(c), (d)
    Main propulsion, remote control			Failure	Manual trip
    	Auto safety trip override		Activated
    	Starting power	Pressure (voltage)	Low	Limit	(a)
    	Location in control	Status	Override		(c)
    	Shaft speed/direction/pitch	See § 113.37 of this chapter.	See § 113.37 of this chapter.	See § 113.37 of this chapter.
    	Clutch fluid	Pressure	Low
    Main propulsion, electric (1)	ABS Marine Vessel Rules Part 4-9-6, tables 4A and 4B	ABS Marine Vessel Rules Part 4-9-6, tables 4A and 4B	ABS Marine Vessel Rules Part 4-9-6, tables 4A and 4B	ABS Marine Vessel Rules Part 4-9-6, tables 4A and 4B	(f)
    Main propulsion, shafting	Stern tube oil tank level		Low
    	Line shaft bearing	Temperature	High
    		Forced lubrication Pressure	Low
    Main propulsion, controllable pitch propeller	Hydraulic oil	Pressure	High, Low
    		Temperature	High
    Generators	Ship service	ABS Marine Vessel Rules Part 4-9-6, table 6	ABS Marine Vessel Rules Part 4-9-6, table 6
    		Starting pressure/voltage	Low
    			Tripped
    	Emergency 2
    	Turbogenerator	ABS Marine Vessel Rules Part 4-9-6, table 6	ABS Marine Vessel Rules Part 4-9-6, table 6	ABS Marine Vessel Rules Part 4-9-6, table 6
    				Manual trip
    	Diesel	ABS Marine Vessel Rules Part 4-9-6, table 6	ABS Marine Vessel Rules Part 4-9-6, table 6	ABS Marine Vessel Rules Part 4-9-6, table 6	(d)
    				Manual trip
    Auxiliary boiler		Run	Trip		(k)
    Gas turbine 3	ABS Marine Vessel Rules Part 4-9-6, Tables 3 and 6	ABS Marine Vessel Rules Part 4-9-6, Tables 3 and 6	ABS Marine Vessel Rules Part 4-9-6, Tables 3 and 6	ABS Marine Vessel Rules Part 4-9-6, Tables 3 and 6	(d)
    Engines and turbines	Jacking/turning gear	Engaged			(g)
    Fuel oil	ABS Marine Vessel Rules Part 4-9-6, tables 5A and 6	ABS Marine Vessel Rules Part 4-9-6, tables 5A and 6	ABS Marine Vessel Rules Part 4-9-6, tables 5A and 6
    	Remote/auto fill level		High	Auto trip or overflow arrangement
    	Hi. press. leakage level		High
    Bilge	Pump remote control	Run
    	Pump auto control	Run	Excessive operations
    	Level		High/location
    Machinery space Class 3 (power-operated) watertight doors		Open/closed
    Fire detection	Machinery spaces		Space on fire		(h)
    Fire main		Pressure	Low
    Personnel	Deadman		Fail to acknowledge		(i)
    General, control and alarm systems	Power supply	Available (pressure)	Failure (low)
    	System function		Failure		(j)
    	Console air conditioning		Failure
    	Built in test equipment	Active
    	Sequential interlock	Activated
    	Safety control		Activated	Auto trip/limit	(j)
    Redundant auxiliary, system, power supply		Status	Auto transfer
    1 See subparts 111.33 and 111.35 of this chapter.
    2 See subparts 112.45 and 112.50 of this chapter.
    3 See § 58.10-15(f) of this subchapter.

[CGD 81-030, 53 FR 17838, May 18, 1988; 53 FR 19090, May 26, 1988, as amended by USCG-2000-7790, 65 FR 58461, Sept. 29, 2000; USCG-2003-16630, 73 FR 65190, Oct. 31, 2008]