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The question of whether or not flame arrestors are required often arises. I thought I would put the information in one place.
These are the statutes that are enforced by the Coast Guard and other on the water law enforcement.
46 CFR 25.35-1
Subpart 25.35—Backfire Flame Control
§ 25.35–1 Requirements.
(a) Every gasoline engine installed in a motorboat or motor vessel after April 25, 1940, except outboard motors, shall be equipped with an acceptable means of backfire flame control.
(b) Installations made before November 19, 1952, need not meet the detailed requirements of this subpart and may be continued in use as long as they are serviceable and in good condition. Replacements shall meet the applicable conditions in this section.
(c) Installations consisting of backfire flame arresters bearing basic Approval Nos. 162.015 or 162.041 or engine air and fuel induction systems bearing basic Approval Nos. 162.015 or 162.042 may be continued in use as long as they are serviceable and in good condition. New installations or replacements must meet applicable requirements of subpart 58.10 of this chapter.
[CGFR 65–50, 30 FR 16653, Dec. 30, 1965, as amended by CGD 88–032, 56 FR 35820, July 29, 1991]
(https://www.govinfo.gov/content/pkg/CFR-2009-title46-vol1/pdf/CFR-2009-title46-vol1.pdf)
Sec. 58.10-5 Gasoline engine installations.
(a) Engine design. All installations shall be of marine type engines suitable for the intended service, designed and constructed in conformance with the requirements of this subchapter.
(b) Carburetors. (1) Drip collectors shall be fitted under all carburetors, except the down-draft type, to prevent fuel leakage from reaching the bilges and so arranged as to permit ready removal of such fuel leakage. Drip collectors shall be covered with flame screens.
Note: It is recommended that drip collectors be drained by a device for automatic return of all drip to engine air intakes.
(2) All gasoline engines must be equipped with an acceptable means of backfire flame control. Installations of backfire flame arresters bearing basic Approval Nos. 162.015 or 162.041 or engine air and fuel induction systems bearing basic Approval Nos. 162.015 or 162.042 may be continued in use as long as they are serviceable and in good condition. New installations or replacements must meet the applicable requirements of this section.
(3) The following are acceptable means of backfire flame control for gasoline engines:
(i) A backfire flame arrester complying with SAE J-1928 incorporated by reference; see 46 CFR 58.03-1) or UL 1111 (incorporated by reference; see 46 CFR 58.03-1) and marked accordingly. The flame arrester must be suitably secured to the air intake with a flametight connection.
(ii) An engine air and fuel induction system which provides adequate protection from propagation of backfire flame to the atmosphere equivalent to that provided by an acceptable backfire flame arrester. A gasoline engine utilizing an air and fuel induction system, and operated without an approved backfire flame arrester, must either include a reed valve assembly or be installed in accordance with SAE J-1928.
(iii) An arrangement of the carburetor or engine air induction system that will disperse any flames caused by engine backfire. The flames must be dispersed to the atmosphere outside the vessel in such a manner that the flames will not endanger the vessel, persons, on board, or nearby vessels and structures. Flame dispersion may be achieved by attachments to the carburetor or location of the engine air induction system. All attachments must be of metallic construction with flametight connections and firmly secured to withstand vibration, shock, and engine backfire. Such installations do not require formal approval and labeling but must comply with this subpart.
[CGFR 68-82, 33 FR 18878, Dec. 18, 1968, as amended by CGD 88-032, 56 FR
35824, July 29, 1991; USCG-2003-16630, 73 FR 65187, Oct. 31, 2008]
(https://www.govinfo.gov/content/pkg/CFR-2009-title46-vol2/pdf/CFR-2009-title46-vol2.pdf)
These are the recommended fines related to flame arrestors as of 2019.
(https://media.defense.gov/2019/Oct/10/2002193274/-1/-1/0/CIM_5582_1B.PDF)
These are the statutes that are enforced by the Coast Guard and other on the water law enforcement.
46 CFR 25.35-1
Subpart 25.35—Backfire Flame Control
§ 25.35–1 Requirements.
(a) Every gasoline engine installed in a motorboat or motor vessel after April 25, 1940, except outboard motors, shall be equipped with an acceptable means of backfire flame control.
(b) Installations made before November 19, 1952, need not meet the detailed requirements of this subpart and may be continued in use as long as they are serviceable and in good condition. Replacements shall meet the applicable conditions in this section.
(c) Installations consisting of backfire flame arresters bearing basic Approval Nos. 162.015 or 162.041 or engine air and fuel induction systems bearing basic Approval Nos. 162.015 or 162.042 may be continued in use as long as they are serviceable and in good condition. New installations or replacements must meet applicable requirements of subpart 58.10 of this chapter.
[CGFR 65–50, 30 FR 16653, Dec. 30, 1965, as amended by CGD 88–032, 56 FR 35820, July 29, 1991]
(https://www.govinfo.gov/content/pkg/CFR-2009-title46-vol1/pdf/CFR-2009-title46-vol1.pdf)
Sec. 58.10-5 Gasoline engine installations.
(a) Engine design. All installations shall be of marine type engines suitable for the intended service, designed and constructed in conformance with the requirements of this subchapter.
(b) Carburetors. (1) Drip collectors shall be fitted under all carburetors, except the down-draft type, to prevent fuel leakage from reaching the bilges and so arranged as to permit ready removal of such fuel leakage. Drip collectors shall be covered with flame screens.
Note: It is recommended that drip collectors be drained by a device for automatic return of all drip to engine air intakes.
(2) All gasoline engines must be equipped with an acceptable means of backfire flame control. Installations of backfire flame arresters bearing basic Approval Nos. 162.015 or 162.041 or engine air and fuel induction systems bearing basic Approval Nos. 162.015 or 162.042 may be continued in use as long as they are serviceable and in good condition. New installations or replacements must meet the applicable requirements of this section.
(3) The following are acceptable means of backfire flame control for gasoline engines:
(i) A backfire flame arrester complying with SAE J-1928 incorporated by reference; see 46 CFR 58.03-1) or UL 1111 (incorporated by reference; see 46 CFR 58.03-1) and marked accordingly. The flame arrester must be suitably secured to the air intake with a flametight connection.
(ii) An engine air and fuel induction system which provides adequate protection from propagation of backfire flame to the atmosphere equivalent to that provided by an acceptable backfire flame arrester. A gasoline engine utilizing an air and fuel induction system, and operated without an approved backfire flame arrester, must either include a reed valve assembly or be installed in accordance with SAE J-1928.
(iii) An arrangement of the carburetor or engine air induction system that will disperse any flames caused by engine backfire. The flames must be dispersed to the atmosphere outside the vessel in such a manner that the flames will not endanger the vessel, persons, on board, or nearby vessels and structures. Flame dispersion may be achieved by attachments to the carburetor or location of the engine air induction system. All attachments must be of metallic construction with flametight connections and firmly secured to withstand vibration, shock, and engine backfire. Such installations do not require formal approval and labeling but must comply with this subpart.
[CGFR 68-82, 33 FR 18878, Dec. 18, 1968, as amended by CGD 88-032, 56 FR
35824, July 29, 1991; USCG-2003-16630, 73 FR 65187, Oct. 31, 2008]
(https://www.govinfo.gov/content/pkg/CFR-2009-title46-vol2/pdf/CFR-2009-title46-vol2.pdf)
These are the recommended fines related to flame arrestors as of 2019.
(https://media.defense.gov/2019/Oct/10/2002193274/-1/-1/0/CIM_5582_1B.PDF)
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