46 CFR § 63.25-7 - Exhaust gas boilers.

---
identifier: "/us/cfr/t46/s63.25-7"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 63.25-7 - Exhaust gas boilers."
title_number: 46
title_name: "Shipping"
section_number: "63.25-7"
section_name: "Exhaust gas boilers."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "F"
subchapter_name: "MARINE ENGINEERING"
part_number: "63"
part_name: "AUTOMATIC AUXILIARY BOILERS"
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. 3306, 3703; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; Department of Homeland Security Delegation No. 00170.1, Revision No. 01.3."
regulatory_source: "CGD 88-057, 55 FR 24238, June 15, 1990, unless otherwise noted."
cfr_part: "63"
---


# 63.25-7 Exhaust gas boilers.

(a) *Construction.* An auxiliary exhaust gas boiler must meet the applicable construction requirements of part 52 or part 53 of this subchapter as determined from table 1 to § 54.01-5 of this subchapter.

(b) *Controls.* Each drum type exhaust gas steam boiler must have a feed water control system. The system must automatically supply the required amount of feed water and maintain it at the proper level. For boilers without a fixed water level, the control system must supply the feed water at a rate sufficient to ensure proper heat transfer. The system must adequately fill the boiler when cold.

(c) *Alarms.* When a condition arises which results in inadequate heat transfer, a high temperature alarm or low flow alarm must be activated. An audible alarm must automatically sound, and a visual indicator must indicate when the fluid temperature exceeds the maximum operating temperature or when the fluid/steam flowing through the heat exchanger is insufficient to ensure proper heat transfer. Additionally, an audible alarm must automatically sound, and a visual indicator must indicate when a soot fire is present in the exhaust gas boiler's uptake.

[CGD 88-057, 55 FR 24237, June 15, 1990, as amended by USCG-2020-0634, 89 FR 50198, June 12, 2024]