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Federal Register / Vol. 86, No. 199 / Tuesday, October 19, 2021 / Proposed Rules
excessive pressure by means of a suitable relief valve which must be integral with the regulator. The relief valve must be set to start to discharge at a pressure not less than two times and not more than three times the delivery pressure.
c All reducing regulators must be fitted with a pressure gage located on the high-pressure side of the regulator.
259. Amend 58.1617 as follows:
a. In paragraph a, remove the word shall and add, in its place, the word must;
b. Revise paragraph b; and c. In paragraph c, remove the word shall and add, in its place, the word must.
The revision reads as follows:
58.1617

Piping and fittings.

b All high-pressure tubing between the cylinders and the regulators must have a minimum wall thickness of 0.049
inch. All low-pressure tubing between the regulator and appliances must have a minimum wall thickness of 0.032
inch.

260. Amend 58.1618 as follows:
a. In paragraph a1, remove the word shall wherever it appears and add, in its place, the word must;
b. Revise paragraph a2; and c. In paragraphs a3 through 5, b2, c, and d, remove the word shall wherever it appears and add, in its place, the word must.
The revision reads as follows:

58.1630

Operating instructions.

k Report any presence of gas odor.
265. Revise 58.1635 as follows:
a. Revise paragraph a; and b. In paragraphs b and c, remove the word shall wherever it appears and add, in its place, the word must.
The revision reads as follows:
58.1635

Markings.

a The outside of the cylinder enclosure housing liquefied petroleum gas cylinders, valves and regulators must be marked as follows:
Liquefied Petroleum Gas Keep Open Fires Away.

58.201

Amended
266. In 58.201b, remove the word shall and add, in its place, the word do.
267. Amend 58.205 by revising paragraph a to read as follows:

58.205

Design.

261. In 58.1619, remove the word shall wherever it appears and add, in its place, the word must.

a Refrigeration machinery may be accepted for installation provided the design, material, and fabrication comply with the applicable requirements of the ABS Marine Vessel Rules incorporated by reference, see 58.031. The minimum pressures for design of all components must be those listed for piping in Table 501.2.4 of ASME B31.5
incorporated by reference; see 58.03
1. In no case may pressure components be designed for a pressure less than that for which the safety devices of the system are set. Pressure vessels must be designed in accordance with part 54 of this subchapter.

268. Amend 58.2010 as follows:
a. In paragraph a, remove the word shall and add, in its place, the word must; and b. Revise paragraph b.
The revision reads as follows:

58.1620

58.2010

58.1618

Installation.

a
2 Cylinders, regulating and safety devices must be securely fastened and supported within the metal enclosure.
The cylinders and high-pressure equipment must be so mounted as to be readily accessible and capable of easy removal for refilling and inspection. The stowage of high-pressure equipment in the housing must be such that the cylinder valves can be readily operated and the pressure gage dial is easily visible. Where possible cylinders must be mounted in an upright position.

58.1619

Amended

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a. In paragraph a, remove the word shall and add, in its place, the word must; and b. Reserve paragraph b.
264. Amend 58.1630 as follows:
a. In paragraphs a through g, remove the word shall and add, in its place, the word must; and b. Revise paragraph k.
The revision reads as follows:

Amended
262. In 58.1620, remove the word shall wherever it appears and add, in its place, the word must.

58.1625

Amended
263. Amend 58.1625 as follows:

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Pressure relieving devices.

b Relief valves fitted on the highpressure side may discharge to the lowpressure side before relieving to atmosphere. When relieving to atmosphere, a relief valve must be fitted
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in the atmospheric discharge connection from the receivers and condensers. The relief valve from the receivers may relieve to the condenser, which in turn may relieve either to the low side or to atmosphere. It must be set to relieve at a pressure not greater than the maximum allowable working pressure.
A rupture disk may be fitted in series with the relief valve, provided the bursting pressure of the rupture disk is not in excess of the relief valve set pressure. Where a rupture disk is fitted on the downstream side of the relief valve, the relief valve must be of the type not affected by back pressure.
269. Amend 58.2015 as follows:
a. Revise the first sentence of paragraph a; and b. In paragraphs b and c, remove the word shall wherever it appears and add, in its place, the word must.
The revision reads as follows:
58.2015 Installation of refrigerating machinery.

a Where refrigerating machines are installed in which anhydrous ammonia is used as a refrigerant, such machines must be located in a well-ventilated, isolated compartment, preferably on the deck, but in no case is it permissible to install such machines in the engineroom space unless the arrangement is such as to eliminate any hazard from gas escaping to the engineroom.

270. Amend 58.2020 as follows:
a. In paragraph a, remove the word shall wherever it appears and add, in its place, the word must;
b. Revise paragraph b; and c. In paragraph c, remove the word shall wherever it appears and add, in its place, the word must.
The revision reads as follows:
58.2020

Refrigeration piping.

b Piping systems must be designed in accordance with ASME B31.5
incorporated by reference; see 58.03
1. Piping used for cargo reliquefaction systems must also comply with the applicable requirements found in low temperature piping, 56.50105 of this subchapter.

271. Amend 58.2025 as follows:
a. In paragraph a, remove the word shall and add, in its place, the word must; and b. Revise paragraph b.
The revision reads as follows:
58.2025

Tests.

b No pneumatic tests in refrigeration systems aboard ships must be made at
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