# 46 CFR § 143.230: Alarms and monitoring

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/ecfr-46-143.230

## Section

- **Citation:** 46 CFR § 143.230
- **Heading:** Alarms and monitoring
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** September 22, 2026
- **Source:** Publisher's official text
- **Location:** Title 46—Shipping > CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY > SUBCHAPTER M—TOWING VESSELS > PART 143—MACHINERY AND ELECTRICAL SYSTEMS AND EQUIPMENT > Subpart B—Requirements for All Towing Vessels

## Text

(a) Each towing vessel must have a reliable means to provide notification when an emergency condition exists or an essential system develops problems that require attention. The following alarms must be provided:
(1) Main engine low lubricating oil pressure;
(2) Main engine high cooling water temperature;
(3) Auxiliary generator engine low lubricating oil pressure;
(4) Auxiliary generator engine high cooling water temperature;
(5) High bilge levels;
(6) Low hydraulic steering fluid levels, if applicable; and
(7) Low fuel level, if fitted with a day tank.
(b) Alarms must:
(1) Be visible and audible at each operating station. The alarm located at the operating station may be a summary alarm; if the alarm at the operating station is a summary alarm, the specific alarm condition must be indicated at the machinery or bilge location;
(2) Have a means to test actuation at each operating station or have a continuous self-monitoring alarm system which actuates if an alarm point fails or becomes disabled;
(3) Continue until they are acknowledged; and
(4) Not interfere with night vision at the operating station.
(c) The following systems must be equipped with gauges at the machinery location:
(1) Main engine lubricating oil pressure and main engine RPM;
(2) Main engine cooling water temperature;
(3) Auxiliary generator engine lubricating oil pressure and auxiliary generator engine RPM;
(4) Auxiliary generator engine cooling water temperature; and
(5) Hydraulic steering fluid pressure, if the vessel is equipped with hydraulic steering systems.

## Nearby sections

- [46 CFR § 143.100 § 143.100 Purpose.](https://www.frixlaw.com/law-library/statutes/ecfr-46-143.100.md)
- [46 CFR § 143.105 § 143.105 Applicability.](https://www.frixlaw.com/law-library/statutes/ecfr-46-143.105.md)
- [46 CFR § 143.115 § 143.115 Definitions.](https://www.frixlaw.com/law-library/statutes/ecfr-46-143.115.md)
- [46 CFR § 143.200 § 143.200 Applicability.](https://www.frixlaw.com/law-library/statutes/ecfr-46-143.200.md)
- [46 CFR § 143.205 § 143.205 General.](https://www.frixlaw.com/law-library/statutes/ecfr-46-143.205.md)
- [46 CFR § 143.210 § 143.210 Alternate design or operational considerations.](https://www.frixlaw.com/law-library/statutes/ecfr-46-143.210.md)
- [46 CFR § 143.215 § 143.215 Existing vessels built to class.](https://www.frixlaw.com/law-library/statutes/ecfr-46-143.215.md)
- [46 CFR § 143.220 § 143.220 Machinery space fire prevention.](https://www.frixlaw.com/law-library/statutes/ecfr-46-143.220.md)
- [46 CFR § 143.225 § 143.225 Control and monitoring requirements.](https://www.frixlaw.com/law-library/statutes/ecfr-46-143.225.md)
- [46 CFR § 143.230 § 143.230 Alarms and monitoring.](https://www.frixlaw.com/law-library/statutes/ecfr-46-143.230.md)
- [46 CFR § 143.235 § 143.235 General alarms.](https://www.frixlaw.com/law-library/statutes/ecfr-46-143.235.md)
- [46 CFR § 143.240 § 143.240 Communication requirements.](https://www.frixlaw.com/law-library/statutes/ecfr-46-143.240.md)
- [46 CFR § 143.245 § 143.245 Readiness and testing.](https://www.frixlaw.com/law-library/statutes/ecfr-46-143.245.md)
- [46 CFR § 143.250 § 143.250 System isolation and markings.](https://www.frixlaw.com/law-library/statutes/ecfr-46-143.250.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/ecfr-46-143.230. Check the current official text before relying on it. Not legal advice.