Oregon Administrative Rules › Chapter 437 - DEPARTMENT OF CONSUMER AND BUSINESS SERVICES, OREGON OCCUPATIONAL SAFETY AND HEALTH DIVISION › Division 4 - AGRICULTURE › Section 437-004-0716 - Oxygen

Current through Register Vol. 63, No. 7, July 1, 2024
(1) Scope. This
			 applies to the installation of bulk oxygen systems on agricultural
			 establishments.
(2) Bulk oxygen
			 systems.
(a) Definition. A bulk oxygen system
			 is an assembly of equipment, such as oxygen storage containers, pressure
			 regulators, safety devices, vaporizers, manifolds, and interconnecting piping,
			 with storage capacity more than 13,000 cubic feet of oxygen, Normal Temperature
			 and Pressure (NTP), connected in service or ready for service, or more than
			 25,000 cubic feet of oxygen (NTP) including unconnected reserves on hand at the
			 site. The bulk oxygen system ends where oxygen at service pressure first enters
			 the supply line. The oxygen containers may be stationary or movable, and the
			 oxygen may be gas or liquid.
(b)
			 Location.
(A) General. Bulk oxygen storage
			 systems must be above ground, outdoors or in a noncombustible building,
			 adequately vented and used exclusively for oxygen storage. Locate containers
			 and associated equipment so there is no exposure to electric power lines,
			 flammable or combustible liquid lines, or flammable gas lines.
(B) Accessibility. Locate the system so that
			 it is readily accessible to mobile supply equipment at ground level and to
			 authorized personnel.
(C) Leakage.
			 For liquid oxygen storage, provide noncombustible surfacing in the area where
			 any leakage might fall during operation of the system and filling of the
			 container. Asphalt or bituminous paving is combustible.
(D) Elevation. When locating bulk oxygen
			 systems near above-ground flammable or combustible liquid storage that may be
			 either indoors or outdoors, it is advisable to locate the system on ground
			 higher than the flammable or combustible liquid storage.
(E) Dikes. When a bulk oxygen system must be
			 lower than adjacent flammable or combustible liquid storage, there must be
			 suitable means (such as diking, diversion curbs, or grading) to prevent
			 accumulation of liquids under the bulk oxygen system.
(c) Distance between systems and exposures.
(A) The minimum distance from any bulk oxygen
			 storage container to exposures, measured in the most direct line except as in
			 (2)(c)(A)(v) and (vii) below, must be as follows:
(i) Fifty feet from combustible
			 structures.
(ii) Twenty-five feet
			 from structures with fire-resistive exterior walls or sprinklered buildings of
			 other construction, but not less than one-half the height of the adjacent side
			 wall of the structure.
(iii) At
			 least 10 feet from any opening in adjacent walls of fire resistive structures.
			 Spacing from such structures must be adequate to permit maintenance, but not be
			 less than 1 foot.
(iv) Flammable
			 liquid storage above-ground. [Table not included. See ED. NOTE.]
(v) Flammable liquid storage below-ground.
			 [Table not included. See ED. NOTE.]
(vi) Combustible liquid storage above-ground.
			 [Table not included. See ED. NOTE.]
(vii) Combustible liquid storage below
			 ground. [Table not included. See ED. NOTE.]
(viii) Flammable gas storage. (Such as
			 compressed flammable gases, liquefied flammable gases and flammable gases in
			 low pressure gas holders). [Table not included. See ED. NOTE.]
(ix) Fifty feet from solid materials that
			 burn rapidly, such as excelsior or paper.
(x) Twenty-five feet from solid materials
			 that burn slowly, such as coal and heavy timber.
(xi) Seventy-five feet in one direction and
			 35 feet in approximately 90° direction from confining walls (not including
			 firewalls less than 20 feet high) to provide adequate ventilation in courtyards
			 and similar confining areas.
(xii)
			 Twenty-five feet from areas such as offices, lunchrooms, locker rooms, time
			 clock areas, and similar locations where people may gather.
(B) Exceptions. The distances in
			 (2)(c)(A)(i), (ii), (iv) to (x) above, do not apply where there are protective
			 structures, like firewalls, between the bulk oxygen storage installation and
			 the exposure high enough to safeguard the oxygen storage systems. In those
			 cases, the bulk oxygen storage installation may be a minimum distance of 1 foot
			 from the firewall.
(d)
			 Storage containers.
(A) Permanently installed
			 containers must be on substantial noncombustible supports on firm
			 noncombustible foundations.
(B)
			 Make liquid oxygen storage containers from materials meeting the impact test
			 requirements of paragraph UG-84 of ASME Boiler and Pressure Vessel Code,
			 Section VIII - Unfired Pressure Vessels - 1968. Containers operating at
			 pressures more than 15 pounds per square inch gage (p.s.i.g.) must comply with
			 ASME Boiler and Pressure Vessel Code, Section VII - Unfired Pressure Vessels -
			 1968. Insulation on the liquid oxygen container must be
			 noncombustible.
(C) High-pressure
			 gaseous oxygen containers must comply with one of the following:
(i) ASME Boiler and Pressure Vessel Code,
			 Section VIII - Unfired Pressure Vessels - 1968.
(ii) DOT Specifications and
			 Regulations.
(e) Piping, tubing, and fittings.
(A) Piping, tubing, and fittings must be
			 suitable for oxygen service and for the pressures and temperatures
			 involved.
(B) Piping and tubing
			 must conform to Section 2 - Gas and Air Piping Systems of Code for Pressure
			 Piping, American National Standard (ANSI), B31.1-1967 with addenda
			 B31.10a-1969.
(C) Fabricate piping
			 or tubing for operating temperatures below 20° F. from materials meeting
			 the impact test requirements of paragraph UG-84 of ASME Boiler and Pressure
			 Vessel Code, Section VIII - Unfired Pressure Vessels - 1968, when tested at the
			 anticipated minimum operating temperature.
(f) Safety relief devices.
(A) Equip bulk oxygen storage containers,
			 regardless of design pressure, with safety relief devices required by the ASME
			 code or the DOT specifications and regulations.
(B) Bulk oxygen storage containers designed
			 and constructed according to DOT specifications must have safety relief devices
			 as required.
(C) Bulk oxygen
			 storage containers that comply with the ASME Boiler and Pressure Vessel Code,
			 Section VIII - Unfired Pressure Vessel - 1968 must have safety relief devices
			 that comply with the Compressed Gas Association Pamphlet "Safety Relief Device
			 Standards for Compressed Gas Storage Containers," S-1, Part 3.
(D) Equip insulation casings on liquid oxygen
			 containers with suitable safety relief devices.
(E) Safety relief devices must not allow
			 moisture that would interfere with proper operation to collect and
			 freeze.
(g) Liquid
			 oxygen vaporizers.
(A) Anchor the vaporizer
			 and use connecting piping sufficiently flexible to compensate for expansion and
			 contraction due to temperature changes.
(B) Adequately protect the vaporizer and its
			 piping on the oxygen and heating medium sections with safety relief
			 devices.
(C) Heat used in an oxygen
			 vaporizer must be indirectly supplied only through media such as steam, air,
			 water or water solutions that do not react with oxygen.
(D) If electric heaters provide the primary
			 source of heat, ground the vaporizing system.
(h) Equipment assembly and installation.
(A) Remove oil, grease or other readily
			 oxidizable materials before placing the system in service.
(B) Make joints in piping and tubing by
			 welding or by using flanged, threaded, slip, or compression fittings. Gaskets
			 or thread sealants must be suitable for oxygen service.
(C) Valves, gages, regulators, and other
			 accessories must be suitable for oxygen service.
(D) People familiar with proper practices
			 must supervise the installation of bulk oxygen systems.
(E) After installation test and prove tight
			 all field erected piping at maximum operating pressure. Use oil-free,
			 non-flammable substances for testing.
(F) Protect storage containers, piping,
			 valves, regulating equipment, and other accessories from physical damage and
			 tampering.
(G) Adequately ventilate
			 enclosures for oxygen control or operating equipment.
(H) The bulk oxygen storage location must
			 have permanent placards that say: "
OXYGEN - NO SMOKING - NO OPEN
			 FLAMES
", or an equivalent warning.
(I) Bulk oxygen installations are not
			 hazardous locations as defined and covered in Division 4/S. Therefore, general
			 purpose or weatherproof types of electrical wiring and equipment are acceptable
			 depending on whether the installation is indoors or outdoors. Install this
			 equipment according to Division 4/S.
(i) For installations that require operation
			 of equipment by the user, keep legible instructions by the equipment.
(j) Cut back or clear combustible growth 15
			 feet from any bulk oxygen storage container.