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Federal Register / Vol. 86, No. 199 / Tuesday, October 19, 2021 / Proposed Rules the material must be available to the public. All approved material is available for inspection at the Coast Guard Headquarters. Contact Commandant CGENG, Attn: Office of Design and Engineering Standards, U.S.
Coast Guard Stop 7509, 2703 Martin Luther King Jr. Avenue SE, Washington, DC 205937509, phone 202 3721375, email typeapproval@uscg.mil, and is available from the sources listed elsewhere in this section. It is also available for inspection at the National Archives and Records Administration NARA. For information on the availability of this material at NARA, email fr.inspection@nara.gov or go to www.archives.gov/federal-register/cfr/
ibr-locations.html.
b ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA
194282959, 8779092786, www.astm.org.
1 ASTM D66519, Standard Test Method for Rust-Preventing Characteristics of Inhibited Mineral Oil in the Presence of Water ASTM
D665; IBR approved for 61.2017.
2 Reserved 61.051

Amended
315. In 61.051, remove the text part 52 and add, in its place, the text part 52 of this subchapter.
316. Amend 61.055 as follows:
a. Revise paragraph a; and b. In paragraph b, remove the word shall wherever it appears and add, in its place, the word must.
The revision reads as follows:

61.055 Preparation of boilers for inspection and test.

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a For internal inspection, manhole and handhold plates, and washout plugs must be removed as required by the marine inspector and the furnace and combustion chambers must be thoroughly cooled and cleaned.

317. Amend 61.0510 as follows:
a. Revise paragraph a;
b. In paragraphs b, c, d, and e, remove the word shall wherever it appears and add, in its place, the word must;
c. Revise paragraphs f and g; and d. Redesignate table 61.0510 as table 61.0510.
The revisions read as follows:
61.0510

Boilers in service.

19:25 Oct 18, 2021

61.0515

Amended
318. Amend 61.0515 as follows:
a. Remove the word shall wherever it appears and add, in its place, the word must; and b. Remove the text Table 61.0510
wherever it appears and add, in its place, the text table 61.0510.

61.0520

Amended
319. In 61.0520, remove the word shall and add, in its place, the word must.
320. Amend 61.105 as follows:
a. Revise paragraph g; and b. In paragraph h3, remove the text Mobile Offshore Drilling Units, and add, in its place, the text Mobile Offshore Drilling Units, all of this chapter,.
The revision reads as follows:

61.105

Pressure vessels in service.

a Each boiler, including superheater, reheater, economizer, auxiliary boiler, low-pressure heating boiler, and unfired steam boiler, must be available for examination by the marine inspector at intervals specified by table 61.0510, and more often if necessary, to
VerDate Sep<11>2014

determine that the complete unit is in a safe and satisfactory condition.

f The marine inspector may require any boiler to be drilled or gaged to determine actual thickness any time its safety is in doubt. At the first inspection for certification after a firetube or flue boiler has been installed for 10 years, it must be gaged to determine the extent of deterioration. Thickness will be measured at or near the waterline, at the bottom and at such other places deemed necessary by the marine inspector.
Examination may be by drilling or a nondestructive means acceptable to the marine inspector. Prior to the use of a nondestructive method of examination, the user must demonstrate to the marine inspector that results having an accuracy within plus or minus 5 percent are consistently obtainable.
g If the thickness is found to be less than the original thickness upon which the maximum allowable working pressure MAWP was based, the MAWP must be recalculated. The thickness of the thinnest measured portion must be used in this calculation.
Either the design formulas given in this subchapter or the ones in effect when the boiler was contracted for or built may normally be used in this recalculation. In no case will an increase in the pressure allowed be made.

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g Bulk storage tanks. 1 Each bulk storage tank containing refrigerated liquefied CO2 for use aboard a vessel as a fire-extinguishing agent must be subjected to a hydrostatic test of 1.5
times the maximum allowable working pressure in the 10th year of the
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installation and at 10-year intervals thereafter. After the test, the tank should be drained and an internal examination made. Parts of the jacket and lagging designated by the marine inspector must be removed at the time of the test so the marine inspector may determine the condition of the tank.
2 In lieu of the requirements contained in paragraph g1 of this section, in the 10th year of installation and at 10-year intervals thereafter, each bulk storage tank containing refrigerated liquefied CO2 for use aboard a vessel as a fire-extinguishing agent which contains a manhole or means to enter, may undergo an internal examination by a marine inspector. Bulk storage tanks which have been satisfactorily examined internally by a marine inspector and in which no defects have been found which impair the safety of the pressure vessel will not require a hydrostatic test. When a defect is found during the internal examination that, in the judgment of the marine inspector, may affect the safety of the pressure vessel, the pressure vessel must be hydrostatically tested at a pressure of 1.5 times the maximum allowable working pressure, unless alternative means, acceptable to the Officer In Charge, Marine Inspection, are used to ensure the safe operation of the pressure vessel.

61.151

Amended
321. In 61.151, remove the word shall and add, in its place, the word must.

61.155

Amended
322. In 61.155, remove the word shall wherever it appears and add, in its place, the word must.

61.1510

Amended
323. In 61.1510a, remove the word shall wherever it appears and add, in its place, the word must.

61.1515

Amended
324. Amend 61.1515 as follows:
a. In paragraph a, remove the word shall and add, in its place, the word must; and b. Reserve paragraph b.

61.201

Amended
325. In 61.201b, remove the word shall and add, in its place, the word must.

61.203

Amended
326. In 61.203, remove the word shall wherever it appears and add, in its place, the word must.

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