Illinois Administrative Code › Title 8 - AGRICULTURE AND ANIMALS › Part 215 - ANHYDROUS AMMONIA, LOW PRESSURE NITROGEN SOLUTIONS, EQUIPMENT, CONTAINERS, AND STORAGE FACILITIES › Subpart A - ANHYDROUS AMMONIA, EQUIPMENT, CONTAINERS, AND STORAGE FACILITIES › Section 215.55 - Safety Relief Devices

Current through Register Vol. 48, No. 28, July 12, 2024
a)
				Every container used in systems covered by Sections
				215.85,
				215.110,
				and
				215.115
				without permanent supply piping to another source of excess pressure shall be
				protected from excess pressure by one or more pressure relief valves of the
				spring loaded type conforming with applicable requirements of ASME
				UG-125(c)(3), UL-132 or other equivalent pressure relief valve
				standard.
b) Pressure relief valves
				shall be in direct communication with the vapor space of the container. All
				pressure relief discharge openings shall have suitable rain caps that will
				allow free discharge of the vapor and prevent the entrance of water. Provision
				shall be made for draining condensate that may accumulate.
c) The discharge from pressure relief valves
				shall be vented away from the container, upward and unobstructed to the
				atmosphere.
d) Container relief
				device pressure shall be set to discharge at no more than 125% maximum
				allowable working pressure for containers built by the 1949 ASME Code Sections
				U-68 and U-69, and no more than 100% for those built by all subsequent ASME
				Codes. Set pressure tolerance is +10% to 0% for non-refrigerated
				containers.
e) Pressure relief
				valves used on containers covered by Sections 215.85, 215.110 and 215.115 shall
				be constructed to discharge at not less than the rates required in Appendix B
				before the pressure is in excess of 121% of the maximum allowable working
				pressure of the container. Relief protection for any other reason shall use
				ASME UG-125 through UG-136.
f)
				Pressure relief valves shall be so arranged that the possibility of tampering
				will be minimized. If the pressure setting adjustment is external, the relief
				valves shall be provided with means for sealing the adjustment.
g) Shutoff valves shall not be installed
				between the pressure relief valves and the containers or systems covered by
				Sections 215.85, 215.110 and 215.115.
h) Relief valves shall be installed in a
				manifold that has a required rate of discharge and so installed to allow either
				of the pressure relief valves to be closed off but does not allow both pressure
				relief valves to be closed off at the same time, or other suitable device so
				that they can be replaced while the container remains pressurized. Containers
				designed with internal pressure relief systems are exempt from this
				requirement.
i) Each pressure
				relief valve used with systems covered by Sections 215.85, 215.110 and 215.115
				shall be plainly and permanently marked as follows:
1) With the letters "AA" or the symbol
				"NH3";
2)
				The pressure in psig at which the valve is set to start-to-discharge;
3) The rate of discharge of the valve in
				cubic feet per minute of air at 60°F and atmospheric pressure;
4) Year of manufacture; and
5) The manufacturer's name and catalog
				number.