46 CFR § 143.230 - Alarms and monitoring.

---
identifier: "/us/cfr/t46/s143.230"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 143.230 - Alarms and monitoring."
title_number: 46
title_name: "Shipping"
section_number: "143.230"
section_name: "Alarms and monitoring."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "M"
subchapter_name: "TOWING VESSELS"
part_number: "143"
part_name: "MACHINERY AND ELECTRICAL SYSTEMS AND EQUIPMENT"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "46 U.S.C. 3103, 3301, 3306, 3308, 3316, 8104, 8904; 33 CFR 1.05; DHS Delegation No. 0170.1."
regulatory_source: "USCG-2006-24412, 81 FR 40101, June 20, 2016, unless otherwise noted."
cfr_part: "143"
---


# 143.230 Alarms and monitoring.

(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.