#### § 34.15-90 Installations contracted for prior to January 1, 1962—T/ALL.

(a) Installations contracted for prior to November 19, 1952, shall meet the requirements of this paragraph.

(1) Existing arrangements, materials, and facilities previously approved shall be considered satisfactory so long as they meet the minimum requirements of this paragraph and they are maintained in good condition to the satisfaction of the Officer in Charge, Marine Inspection. Minor repairs and alterations may be made to the same standards as the original installation.

(2) The details of the systems shall be in general agreement with [§§ 34.15-5](/on/2024-09-23/title-46/section-34.15-5) through [34.15-40](/on/2024-09-23/title-46/section-34.15-40) insofar as is reasonable and practicable, with the exception of [§ 34.15-5(d)(1)](/on/2024-09-23/title-46/section-34.15-5#p-34.15-5(d)(1)) through [(3)](/on/2024-09-23/title-46/section-34.15-5#p-34.15-5(d)(3)) covering spaces other than cargo spaces, which systems may be installed in accordance with [paragraphs (a) (4)](/on/2024-09-23/title-46/section-34.15-90#p-34.15-90(a)(4)) through [(7)](/on/2024-09-23/title-46/section-34.15-90#p-34.15-90(a)(7)) of this section.

(3) For cargo tanks at least one pound of carbon dioxide shall be available for each 30 cubic feet of the largest cargo tank. The discharge of the required amount of carbon dioxide shall be complete within 5 minutes.

(4) In boiler rooms, the bilges shall be protected by a system discharging principally below the floor plates. Perforated pipe may be used in lieu of discharge nozzles for such systems. The number of pounds of carbon dioxide shall be equal to the gross volume of the boiler room taken to the top of the boilers divided by 36. In the event of an elevated boiler room which drains to the machinery space, the system shall be installed in the engineroom bilge and the gross volume shall be taken to the flat on which the boilers are installed.

(5) In machinery spaces where main propulsion internal combustion machinery is installed, the number of pounds of carbon dioxide required shall be equal to the gross volume of the space taken to the underside of the deck forming the hatch opening divided by 22.

(6) In miscellaneous spaces other than cargo or main machinery spaces the number of pounds of carbon dioxide required shall be equal to the gross volume of the space divided by 22.

(7) Branch lines to the various spaces other than cargo and similar spaces shall be as noted in table [34.15-90(a)(7)](/on/2024-09-23/title-46/section-34.15-90#p-34.15-90(a)(7)). This table is based on cylinders having discharge outlets and siphon tubes of 3⁄8-inch diameter.

Table [34.15-90](/on/2024-09-23/title-46/section-34.15-90)(a)(7)

| Number of cylinders | | Nominal pipe size, inches |
| --- | --- | --- |
| Over | Not over |
| | 2 | 1/2-standard. |
| 2 | 4 | 3/4-standard. |
| 4 | 6 | 1-extra heavy. |
| 6 | 12 | 11/4-extra heavy. |
| 12 | 16 | 11/2-extra heavy. |
| 16 | 27 | 2-extra heavy. |
| 27 | 39 | 21/2-extra heavy. |
| 39 | 60 | 3-extra heavy. |
| 60 | 80 | 31/2-extra heavy. |
| 80 | 104 | 4-extra heavy. |
| 104 | 165 | 5-extra heavy. |

(b) Installations contracted for on or after November 19, 1952, but prior to January 1, 1962, shall meet the requirements of this paragraph.

(1) Existing arrangements, materials, and facilities previously approved shall be considered satisfactory so long as they meet the minimum requirements of this paragraph and they are maintained in good condition to the satisfaction of the Officer in Charge, Marine Inspection. Minor repairs and alterations may be made to the same standards as the original installation.

(2) The details of the systems shall be in general agreement with [§§ 34.15-5](/on/2024-09-23/title-46/section-34.15-5) through [34.15-40](/on/2024-09-23/title-46/section-34.15-40) insofar as is reasonable and practicable with the exception that delayed discharges need not be provided for installations made prior to July 1, 1957.

[CGFR 65-50, [30 FR 16694](https://www.federalregister.gov/citation/30-FR-16694), Dec. 30, 1965, as amended by CGFR 66-33, [31 FR 15268](https://www.federalregister.gov/citation/31-FR-15268), Dec. 6, 1966; USCG-1999-6216, [64 FR 53223](https://www.federalregister.gov/citation/64-FR-53223), Oct. 1, 1999]