#### § 62.35-50 Tabulated monitoring and safety control requirements for specific systems.

The minimum instrumentation, alarms, and safety controls required for specific types of systems are listed in table 1 to [§ 62.35-50](/on/2024-09-23/title-46/section-62.35-50). The ABS Marine Vessel Rules (incorporated by reference; see [§ 62.05-2](/on/2024-09-23/title-46/section-62.05-2)) required for engineering systems are also listed in table 1 to [§ 62.35-50](/on/2024-09-23/title-46/section-62.35-50).

(a) Safety limit controls must be provided in navigating bridge primary propulsion control systems. See [§ 62.35-5(c)](/on/2024-09-23/title-46/section-62.35-5#p-62.35-5(c)).

(b) Safety trip controls and alarms must be provided for all main boilers, regardless of mode of operation. See [§ 62.35-20(a)](/on/2024-09-23/title-46/section-62.35-20#p-62.35-20(a)).

(c) Loss of forced lubrication safety trip controls must be provided for main propulsion turbines and main propulsion diesel engines.

(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)](/on/2024-09-23/title-46/section-62.35-5#p-62.35-5(e)(2)).

(e) Transfer interlocks must be provided for main propulsion systems capable of remote and local control.

(f) Semiconductor controlled rectifiers must have current limit controls.

(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)](/on/2024-09-23/title-46/section-62.25-5#p-62.25-5(a)).

(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.

(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)](/on/2024-09-23/title-46/section-62.50-20#p-62.50-20(b)(1)).

(j) All automatic controls and alarms must be failsafe to the least critical consequence for the particular system. See [§ 62.30-1](/on/2024-09-23/title-46/section-62.30-1).

(k) The operating or tripped status of vital auxiliary boilers must be indicated at the ECC. See [part 63 of this subchapter](/on/2024-09-23/title-46/part-63).

Table 1 to [§ 62.35-50](/on/2024-09-23/title-46/section-62.35-50)—Minimum System Monitoring and Safety Control Requirements for Specific Systems

| System | Service | Instrumentation | Alarm | Safety control | See also paragraph |
| --- | --- | --- | --- | --- | --- |
| 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](/on/2024-09-23/title-46/section-113.37). | See [§ 113.37 of this chapter](/on/2024-09-23/title-46/section-113.37). | See [§ 113.37 of this chapter](/on/2024-09-23/title-46/section-113.37). | |
| | 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 | | |
| | Emergency2 | | | | |
| | 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 turbine3 | 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](/on/2024-09-23/title-46/section-58.10-15#p-58.10-15(f)). | | | | | |

[CGD 81-030, [53 FR 17838](https://www.federalregister.gov/citation/53-FR-17838), May 18, 1988; [53 FR 19090](https://www.federalregister.gov/citation/53-FR-19090), May 26, 1988, as amended by USCG-2000-7790, [65 FR 58461](https://www.federalregister.gov/citation/65-FR-58461), Sept. 29, 2000; USCG-2003-16630, [73 FR 65190](https://www.federalregister.gov/citation/73-FR-65190), Oct. 31, 2008]