California Code of Regulations › Title 8 - Industrial Relations › Division 1 - Department of Industrial Relations › Chapter 4 - Division of Industrial Safety › Subchapter 1 - Unfired Pressure Vessel Safety Orders › Article 6 - Anhydrous Ammonia › Section 514 - Installation of Refrigerated Storage Containers

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
(a) Containers shall be supported on suitable
					 noncombustible foundations designed to accommodate the type of container being
					 used.
Adequate protection against flotation or other water
						damage shall be provided wherever high flood water might occur.
Containers for product storage at less than 32° F
						shall be supported in such a way, or heat shall be supplied, to prevent the
						effects of freezing and consequent frost heaving.
(b) A check valve shall be installed in lieu
					 of the required excess flow valve on the fill connection, except when flow is
					 needed in both directions, and a remotely operated shutoff valve shall be
					 installed on all other connections located below the maximum liquid
					 level.
(c) The filling density for
					 refrigerated storage containers shall be such that the container will not be
					 liquid full at a liquid temperature corresponding to the vapor pressure at the
					 start-to-discharge pressure setting of the safety-relief valve.
(d) Safety-relief valves shall be set to
					 start-to-discharge at a pressure not in excess of the design pressure of the
					 container and shall have a total relieving capacity sufficient to prevent a
					 maximum pressure in the container of more than 120 percent of the design
					 pressure. Relief valves for refrigerated storage containers shall be
					 self-contained spring-loaded, weight-loaded, or self-contained pilot-operated
					 type.
The total relieving capacity shall be the larger
						of:
(1) Possible refrigeration system
					 upset such as (A) cooling water failure, (B) power failure, (C) instrument air
					 or instrument failure, (D) mechanical failure of any equipment, (E) excessive
					 pumping rates.
(2) Fire exposure
					 determined in accordance with Compressed Gas Association (CGA) S-1, Part 3,
					 Safety Relief Device Standards For Compressed Gas Storage Containers, 1959,
					 except that "A" shall be the total exposed surface area in square feet up to
					 25-foot above grade or to the equator of the storage container if it is a
					 sphere, whichever is greater. If the relieving capacity required for fire
					 exposure is greater than that required by (1) of this subdivision, the
					 additional capacity may be provided by weak roof-to-shell seams in containers
					 operating at essentially atmospheric pressure and having an inherently weak
					 roof-to-shell seam. The weak roof-to-shell seam is not to be considered as
					 providing any of the capacity required in (1) of this subdivision.
If vent lines are installed to conduct the vapors from
						the relief valve, the back pressure under full relieving conditions shall not
						exceed 50 percent of the start-to-discharge pressure for pressure balanced
						valves or 10 percent of the start-to-discharge pressure for conventional
						valves. The vent lines shall be installed to prevent accumulation of liquid in
						the lines.
The valve or valve installation shall provide weather
						protection.
Atmospheric storage shall be provided with vacuum
						breakers. Ammonia gas, nitrogen, methane, or other inert gases can be used to
						provide a pad.