Imágenes de páginas
PDF
EPUB

§ 38.15-5 Cargo hose-TB/ALL. (a) exible metal hose fabricated of seamss steel pipe and flexible joints of steel : bronze, or hose fabricated of other uitable material resistant to the action

liquefied petroleum gases shall be tted to the liquid and vapor lines durag filling and discharging of the tanks.

(b) Hose subject to tank pressure hall be designed for a bursting pressure if not less than five times the maximum afety relief valve setting of the tank.

(c) Hose subject to discharge pressure of pumps or vapor compressors shall be lesigned for a bursting pressure of not ess than five times the pressure setting of the pump or compressor relief valve.

(d) Before being placed in service each new cargo hose, with all necessary fittings attached, shall be tested hydrostatically by the manufacturer to a pressure of not less than twice the maximum pressure to which it may be subjected. The hose shall be marked with the maximum pressure guaranteed by the manufacturer. SUBPART 38.20_VENTING AND

VENTILATION $ 38.20-1 Venting-T/ALL. (a) Each safety relief valve installed on a cargo tank shall be connected to a branch vent of a venting system which shall be constructed so that the discharge of gas will be directed vertically upward to a point at least 10 feet above the weather deck or the top of any tank or house located above the weather deck.

(b) The capacity of branch vents or vent headers shall depend upon the number of cargo tanks connected to such branch or header capacity as provided for in the table 38.20–1 (b), and upon the total safety relief valve discharge capacity. TABLE 38.20-1 (b)-CAPACITY OF BRANCE VENTS OR VENT HEADERS

Percent of

total valve Number of cargo tanks:

discharge 1 or 2.-

100 8.

90 4.

80 5..

70 6 or more.

60 (c) In addition to the requirements specified in paragraphs (a) and (b) of this section, the size of the branch vents or vent headers shall be such that the back pressure in the relief valve discharge lines shall not be more than 10 percent of the safety relief valve setting.

(d) Return bends and restrictive pipe fittings are not permitted.

(e) Vents and headers shall be so installed as to prevent excessive stresses on safety relief valve mountings.

(f) The vent discharge riser shall be so located as to provide protection against mechanical injury and such discharge pipes shall be fitted with loose raincaps or other suitable means to prevent entrance of rain or snow.

(g) No valve of any type shall be fitted in the vent pipe between the safety relief valve and the vent outlets.

(h) Suitable provision shall be made for draining condensate which may accumulate in the discharge pipe.

$ 38.20–5 Venting-B/ALL. (a) Safety relief valves on cargo tanks in barges may be connected to individual or common risers which shall extend to a reasonable height above the deck. An alternate arrangement consisting of a branch vent header system as required by $ 38.20–1 may be installed. In any case, the provisions of paragraphs (d) through (h) of $ 38.20–1 shall apply.

(b) Arrangement specially provided for venting cargo tanks forming a part of the hull on unmanned barges will be considered by the Commandant upon presentation of plans. SUBPART 38.25-PERIODIC INSPECTIONS AND

TESTS $ 38.25-1 Tests and inspectionsTB/ ALL. (a) Each tank shall be subjected to the following tests and inspections at the following stated intervals:

(1) An internal examination shall be made at least once in each 8 calendar years.

(2) An external examination of unlagged tanks and the visible parts of lagged tanks shall be made at each inspection for certification and at such other times as considered necessary. (Subparagraph (2) amended by CGFR 57–18, 22 F. R. 3466, May 17, 1957)

(3) The lagging shall be removed from lagged tanks at least once in each 8 calendar years for external examination of the tanks.

(b) A hydrostatic test of 142 times the allowable pressure as determined by the safety relief valve setting shall be made at any time that the inspector considers such hydrostatic test necessary to determine the condition of the tank.

§ 38.25–5 Removal of defective tanks TB/ALL. If a tank fails to pass the tests prescribed in this subpart, it shall be removed from service unless otherwise authorized by the Commandant.

§ 38.25-10 Safety valvesTB/ALL. The safety relief valve discs shall be lifted from their seats in the presence of an inspector by either liquid, gas or vapor pressure at least once every four years to determine the accuracy of adjustment and, if necessary, shall be reset.

Part 39—Inflammable or Com

bustible Liquids Having Lethal Characteristics [Revised]

Subpart 39.01-General Sec. 39.01-1 Scope of regulations—TB/ALL. 89.01-5 Certificate of inspection—TB/ALL. Subpart 39.05-Design, Arrangement, and

Installation of Cargo Tanks 89.05-1 Design, construction, and arrange

ment-TB/ALL. 89.05-5 Markings-TB/ALL. 39.05–10 Installation-TB/ALL. Subpart 39.10~Piping, Valves, Fittings, and

Accessory Equipment 39.10-1 Valves and accessories-TB/ALL. 39.10-5 Piping and attings—TB/ALL. 39.10-10 Safety relief and pressure-vacuum

relief valves-TB/ALL. 39.10-16 Gaging devices—TB/ALL. Subpart 39.15—Special Cargo Handling

Requirements 39.15-1 Warning sign at gangway

TB/ALL. 89.15-5 Cargo discharge--TB/ALL. 89.15–10 Pump room controls-TB/ALL.

Subpart 39.20—Venting and Ventilation 39.20-1 Venting-TB/ALL. 39.20-5 Ventilation—TB/ALL. Subpart 39.25—Periodic Inspections and Test 89.25-1 Hydrostatic tests and inspection

TB/ALL 39.25-5 Removal of detective tanks

TB/ALL. 39.25-10 Safety valves—TB/ALL.

AUTHORITY: $9 39.01-1 to 89.25-10 issued under R. S. 4405, as amended, 44172, as amended, 4462, as amended; 46 U. 8. O. 376, 891a, 416. Interpret or apply sec. 3, 68 Stat. 675; 50 U. 8. C. 198. E. O. 10402, 17 F. R. 9917; 3 CFR, 1952 Supp.

SOURCE: $139.01-1 to 39.25-10 contained in CGFR 55-23, 20 F. R. 4856, July 8, 1955, except as otherwise noted.

SUBPART 39.01 -GENERAL $ 39.01-1 Scope of regulationsTB/ ALL. (a) The regulations in this part contain requirements for the transportation of inflammable or combustible liquids having lethal characteristics and defined as Class "B" or "C" poisons in $$ 146.25–3 and 146.25-5 of Part 146 of Subchapter N (Explosives or Other Dangerous Articles on Board Vessels) of this chapter. The regulations covering the transportation in portable tanks of inflammable or combustible liquids having lethal characteristics and defined as Class "B" or "C"" poisons are contained in Part 146 of Subchapter N (Explosives or Other Dangerous Articles on Board Vessels) of this chapter.

$.39.01–5 Certificate of inspection TB/ALL. (a) Certificate of inspection shall be endorsed for the carriage of Class "B" or "C" poisonous liquids, es follows:

Inspected and approved for the carriage of Inflammable or combustible Class "B" or "O poisonous liquids. SUBPART 39.05-DESIGN, ARRANGEMENT, AND

INSTALLATION OF CARGO TANKS $ 39.05–1 Design, construction, and arrangementTB/ALL. (a) Cargo haying a Reid vapor pressure not exceeding 14 pounds per square inch may be transported in tanks, cylindrical or rectangular, independent of the vessel's hull structure, or in tanks built integral with the vessel's hull and completely separated from the shell of the vessel by means of wing tanks, cofferdams, double bottoms or similar voids.

(b) Independent tanks shall be designed for a head of at least 8 feet above the top of the tank or the highest level the product may rise, whichever is the greater, using the specific gravity of the product to be carried. In general, plate less than 56 inch in thickness shall not be used in the fabrication of independent tanks unless otherwise approved by the Commandant.

(c) Tanks built integral with the vessel's hull shall conform with the scantling requirements of the American Bureau of Shipping.

(d) (1) Cargo tanks transporting liquids having a Reid vapor pressure exceeding 14 pounds per square inch, or vented at a gage pressure exceeding 4 pounds per square inch, or where air or water pressure is used to discharge the

cargo, shall be fabricated as an arcwelded unfired pressure vessel and meet the applicable requirements of Parts 50 to 61, inclusive, of Subchapter F (Marine Engineering) of this chapter.

(2) Unfired pressure vessel cargo tanks shall be designed for a pressure of not less than the vapor pressure, in pounds per square inch gage, of the lading at 115° F., or the maximum air or water pressure used in discharging cargo, whichever is greater, but in no case shall the design pressure of such tanks be less than 30 pounds per square inch.

(3) The plate thickness of unfired pressure vessel type cargo tanks shall be not less than 516 inch. Dished heads shall be used in the design of the tanks.

(e) Each tank shall be provided with not less than a 15-inch by 18-inch or an 18-inch diameter manhole, fitted with a cover and located as close as possible to the top of the tank. Where access trunks are fitted, the diameter or minimum dimension of the trunk shall be not less than 30 inches.

$ 39.05-5 Markings-TB/ALL. (a) Upon satisfactory completion of tests and inspection, unfired pressure vessel tanks shall have markings as required by paragraph (a) of $ 38.05-5 of this subchapter.

(b) In addition to the aforementioned markings, the following inscription shall be stamped on the tank, or a corrosionresistant plate containing this data shall be securely attached thereto:

This tank shall not contain a product having a vapor pressure in excess of gage at 115° F.

(c) Al tank markings shall be permanently and legibly stamped in a readily visible position, and shall not be obscured by painting.

8 39.05–10 InstallationTB/ALL. (a) Cargo tanks independent of the hull shall be installed with a clearance of not less than 24 inches from the vessel's sides. A working space of not less than 15 inches shall be provided around and under each tank, or provision shall be made for moving the tanks to secure adequate clearance for inspection and maintenance.

(b) Independent tanks shall be mounted on substantial steel saddles securely held down and chocked. Tank saddles shall be designed so as to mini

mize the concentration of excessive loads at any point on the shell.

(c) Tanks may be located in hold spaces or in other cargo tanks meeting the requirements for cofferdams as prescribed in $ 32.60–10 or $ 32.65–15, and may be installed "on deck” or “under deck" with the tank protruding above deck. On installations where a portion of the tank extends through the weather deck, provision shall be made to maintain the watertightness of the deck. Where such tanks are installed in bulk liquid cargo tanks, the liquids in the surrounding tanks shall be inert to the toxic or poisonous liquids at temperatures of 100° F. and under, at atmospheric pressure.

(d) All tanks shall be installed with manhole openings and fittings located above the weather deck.

(e) No strength welding employed in the attachment of supports, lugs, fittings, etc. shall be done on tanks that require and have been stress-relieved, unless authorized by the Commandant. SUBPART 39.10-PIPING, VALVES, FITTINGS,

AN ACCESSORY EQUIPMENT $ 39.10-1 Valves and accessoriesTB/ALL. (a) All shutoff valves and accessory equipment shall be of types suitable for use with the cargo to be carried. Cast iron shall not be employed in the construction of valves, fittings, or flanges located outside the cargo tanks.

(b) All connections to tanks, except safety relief valves, pressure-vacuum relief valves, or gaging connections, shall have shutoff valves located as close to the tank as practicable.

§ 39.10–5 Piping and fittingsTB/ ALL. (a) Piping shall be suitable for use with the liquid cargo to be carried and shall conform to the requirements of Part 55 of Subchapter F (Marine Engineering) of this chapter. Piping shall be of seamless drawn material, except that electric resistance-welded steel piping will be acceptable.

(b) All pipe connections on pressure vessel tanks shall be grouped in the smallest practicable space and shall be located near the highest point on the tank. Alternate piping arrangements may be considered for approval by the Commandant.

(c) The pumps and cargo piping used for loading and discharging Class "B" or "C" poisons shall be independent of all other piping.

P. 8. 1.

[ocr errors][ocr errors]

(d) Where multiple cargoes are carried, and the cargo piping conveying Class “B” or “C” poisons are led through cargo tanks containing other products the piping shall be encased in a tunnel.

(e) Where cargo lines for handling other products, or bilge and ballast piping are led through cargo tanks containing Class "B" or "C" poisons, the piping shall be encased in a tunnel.

(f) Where possible provision shall be made for expansion and contraction of piping by means of seamless steel pipe expansion bends. Corrugated expansion joints may be used, provided satisfactory evidence is shown that space limitations do not permit the use of expansion bends. Slip type expansion joints are prohibited.

$ 39.10-10 Safety relief and pressurevacuum relief valvesTB/ALL. (a) Each pressure vessel type cargo tank shall be fitted with one or more approved safety relief valves, set to start to discharge at a pressure of not less than 90 percent of the design pressure of the tank, but not in excess of the design pressure. Safety relief valves shall have suficient relieving capacity to prevent a pressure rise exceeding 20 percent above the design pressure of the tank.

(b) Safety relief valves for pressure type cargo tanks shall be attached to the tank near the highest point of the vapor space.

(c) Gravity type cargo tanks shall be fitted with an approved pressure-vacuum relief valve of not less than 242-inch size, which shall be set at a pressure of not less than 3 pounds per square inch, but not in excess of the design pressure of the tank.

(d) Pressure-vacuum relief valves for gravity type cargo tanks may be installed on the expansion trunk or in the branch vent line between the expansion trunk and the vent header.

§ 39.10–15 Gaging devicesTB/ALL. A closed gaging system shall be provided for determining the liquid level within the tanks. SUBPART 39.15-SPECIAL CARGO HANDLING

REQUIREMENTS $ 39.15–1 Warning sign at gangwayTB/ALL. When transferring bulk cargo A warning sign as provided in paragraph (b) of $ 35.30-1 of this subchapter shall be displayed to warn persons on board or in the vicinity of the tanks.

§ 39.15–5 Cargo dischargeTB/ALL. The use of gas or liquid pressure to discharge the cargo from gravity type cargo tanks is prohibited. Gas or liquid pressure may be used to discharge the cargo from pressure vessel type cargo tanks, provided authorization is granted by the Commandant.

§ 39.15–10 Pump room controlsTB/ALL. Cargo pumps, valves and fittings used for the transfer of Class "B" or “C” poisons and installed in pump rooms located below the weather deck shall be provided with means of operation from a position above the freeboard deck. SUBPART 39.20_VENTING AND VENTILATION

§ 39.20-1 VentingTB/ALL. (a) Vent pipes shall be connected to each safety relief or pressure vacuum-relief valve. Tanks carrying Class "B" or "C" poisons shall be vented independent of tanks carrying other products. Tanks carrying the same class products may be connected to a vent header system or each tank may be vented independently.

(b) The vent riser shall extend to a height above the weather deck equal to at least one-third the beam of the vessel and shall terminate at a comparable distance from any other living or working space, ventilator inlet, or source of vapor ignition. When special conditions prevent the vent outlets from being permanently installed at a height above the deck of one-third the beam of the vessel, an adjustable system shall be provided which, when extended vertically, shall reach a height of one-third the beam of the vessel.

(c) The safety relief valve may be fitted with a bypass having the full ca. pacity of the relief valve and equipped with a manually operated stop valve to permit equalizing pressures during filling and discharging operations.

$39.20-5 VentilationTB/ALL. (a) pump rooms located below the weather deck shall be fitted with power ventilation designed to assure sufficient air movement through the pump room to avoid accumulation of toxic vapors. The ventilation system shall be of the exhaust type having blower capacity sufficient to permit a change of air of at least 20 times per hour. At least two exhaust inlet ducts shall be provided and located near the floor level and at points where a concentration of toxic vapors

y be expected. At least two fresh air et ducts shall be provided. b) Enclosed pump rooms located ove the weather deck shall be fitted ih power ventilation having an exust type blower of suficient capacity permit a change of air of at least 10 aes per hour. The exhaust inlet ducts all be located at points where a conntration of toxic vapors may be excted. At least one fresh air inlet duct all be provided. (c) The outlet duct exhausts shall rminate at a distance of at least six et above the enclosed space or pump pom and at least six feet from any enrance to the interior part of the vessel. he discharge end of the exhaust ducts hall be so located as to preclude the possibility of recirculating contaminated lir through the pump room, or other spaces where personnel may be present. SUBPART 39.25_PERIODIC INSPECTIONS AND

TESTS $ 39.25–1 Hydrostatic tests and inspectionTB/ALL. (a) Each pressure vessel tank shall be subjected to an internal examination biennially and to a hydrostatic test at the time of the peri. odic inspection on the fourth year after installation, and a like test shall be applied every fourth year thereafter.

(1) If there is evidence of corrosion or deterioration, the marine inspector may require additional internal examinations or hydrostatic tests at intermediate inspection periods.

(2) The hydrostatic test shall be equal to one and one-half times the design pressure. For lagged tanks the hydro

static test shall be applied for a period of at least 20 minutes without pressure drop when portions of the jacket and lagging are not removed at intermediate inspection period.

(3) Lagged tanks shall have a portion of the jacket and lagging removed on the lower portion of the shell as directed by the marine inspector at least once every eight years for external examination.

(b) Gravity tanks and cargo tanks constructed integral with the vessel's hull shall be inspected as prescribed in Subpart 31.10 of Part 31 of this subchapter. Lagged gravity type tanks shall be examined as required by paragraph (a) of this section.

$ 39.25-5 Removal of defective tanksTB/ALL. If a pressure vessel fails to pass the tests prescribed in this subpart, or is deemed by the marine inspector to be unsuitable for continued use, it shall be removed from service unless otherwise authorized by the Commandant.

$ 39.25–10 Safety valvesTB/ALL. (a) The safety relief valve discs shall be ufted from their seats in the presence of & marine inspector by either liquid, gas or vapor pressure at least once every four years to determine accuracy of adjustment and, if necessary, shall be reset.

(b) The setting and operation of the pressure-vacuum relief valves shall be checked in the presence of a marine inspector at the inspection for certification and at such other times as considered necessary. (Paragraph (b; amended by CGFR 57–18, 22 F. R. 3469, May 17, 1957]

SUBCHAPTER ELOAD LINES

Part 43—Foreign or Coastwise

Voyage Subpart 43.01-Administration Sec. 43.01-40 Assignment and certification; as

signing authority. (Revised ] Subpart 43.15—load Lines for Steamers 43.15–97 Freeboard table for steamers.

(Amended] Subpart 43.30—load Lines for Tankers 43.70–70 Freeboard table

for tankers. (Amended) Subpart 43.40—Zones and Seasonal Areas and

Miscellaneous Requirements 43.40–6 Fees, travel e pense. (Revised]

Sec 48.40-10 Forms of load line certificates.

(Amended] SUBPART 43.01-ADMINISTRATION $ 43.01–40 Assignment and certification; assigning authority. (a) As provided in the Load Line Acts approved March 2, 1929, and August 27, 1935, the American Bureau of Shipping is appointed to assign load lines and to determine whether the position of and the manner of marking each vessel to which the act applies has been performed in accordance with this part, and is authorized to issue a load line certificate, certifying to the correctness of the marks

« AnteriorContinuar »