Male Threaded Emergency Vents

244OM

UL Listed emergency vent (pressure relief only) used on aboveground storage tanks, as a code requirement, to help prevent the tank from becoming over-pressurized and possibly rupturing if ever exposed to fire. The vent must be used in conjunction with a “normal vent.” Correct application of this vent requires proper vent size and selection for the tank system in order to meet the specific venting capacity.

 

WARNINGS: The 244 emergency vent is for "emergency pressure relief only" and must be used in conjunction with a "normal vent" or pressure vacuum vent such as a Morrison Fig. 354, 548,748, 749 or 922. The 244 emergency vent must be properly sized and selected for each specific tank application in order to meet the proper "venting capacity" requirements. See the Morrison Vent Guide for further instructions.

Code Compliance

When properly sized for the tank, this vent will conform to the requirements of the International Fire Code; National Fire Code of Canada; National Fire Protection Agency—NFPA 20, 30, 30A, 31, 37, 110; Petroleum Equipment Institute—PEI RP200, PEI RP800; Underwriters Laboratories Inc.—UL-142, UL-2085, UL-2244; Underwriters Laboratories of Canada—CAN/ULC S601, CAN/ULC S602, CAN/ULC S652

 

Approvals

California Air Resource Board (CARB) Phase 1 Enhanced Vapor Recovery (EVR) AST Certified Products (VR-402-B); Underwriters Laboratories Inc. UL-2583

 

WARNING: DO NOT FILL OR UNLOAD FUEL FROM A STORAGE TANK UNLESS IT IS CERTAIN THAT THE TANK VENTS WILL OPERATE PROPERLY. Morrison tank vents are designed only for use on shop fabricated atmospheric tanks which have been built and tested in accordance with UL 142, NFPA 30 & 30A, and API 650 and in accordance with all applicable local, state, and federal laws. In normal operation, dust and debris can accumulate in vent openings and block air passages. Certain atmospheric conditions such as a sudden drop in temperature, below freezing temperatures, and freezing rain can cause moisture to enter the vent and freeze which can restrict internal movement of vent mechanisms and block air passages. All storage tank vent air passages must be completely free of restriction and all vent mechanisms must have free movement in order to insure proper operation. Any restriction of airflow can cause excessive pressure or vacuum to build up in the storage tank, which can result in structural damage to the tank, fuel spillage, property damage, fire, injury, and death. Monthly inspection, and immediate inspection during freezing conditions, by someone familiar with the proper operation of storage tank vents, is required to insure venting devices are functioning properly before filling or unloading a tank.

 

Fig Suffix Size Description Weight
244OM 0020 AV 2" 8oz/sq.in. Emergency Vent - Male Thread - Brass- w/O-Ring - UL&ULC 1
244OMB 0020 AV 2" 8oz/sq.in. Emergency Vent - Male British Pipe Thread - Brass - w/O-Ring - UL&ULC 1
244OMA 0020 AV   This model is no longer available. Refer to 245M--0200 AV for equivalent.
244OMAS 0020 AV This model is no longer available. Refer to 245MS-0200 AV for equivalent.  
244OMAB 0020 AV   This model is no longer available. Refer to 245MB-0200 AV for equivalent.  
244OMABS 0020 AV This model is no longer available. Refer to 245MSB0200 AV for equivalent.  
244OMS 0020 AV 2" 8oz/sq.in. Emergency Vent - Male Thread - w/O-Ring - w/Screen - UL&ULC Listed 1
244OMBS 0020 AV 2" 8oz/sq.in. Emergency Vent - Male BSP Thread - w/O-Ring - w/Screen - UL&ULC Listed 1
244OMA 0030AVEVR 2" 16oz/sq.in. Emergency Vent - Alum. Body -Male Thds - w/O-Ring - UL&ULC, EVR App. 0.4
244OMAS 0030AVEVR 2" 16oz/sq.in. E -Vent - Alum. Body -Male Thds - w/O-Ring - W/Screen - UL&ULC-EVR App. 0.4
244OM 0050 AV 3" 8oz/sq.in. Emergency Vent - Male Thread - w/O-Ring, UL & ULC Listed 7
244OMS 0050 AV 3" 8oz/sq.in. Emergency Vent - Male Thread - w/O-Ring, UL & ULC Listed, w/Screen 7
244OM 0060 AV 3" 16oz/sq.in. Emergency Vent - Male Thread - w/O-Ring, UL & ULC Listed 11
244OM 0060AVEVR 3" 16oz/sq.in. Emergency Vent - Male Thread - w/O-Ring, UL&ULC Listed, EVR Approved 11
244OMS 0060 AV 3" 16oz/sq.in. Emergency Vent - Male Thread - w/O-Ring, UL & ULC Listed, w Screen 11
244OMS 0060AVEVR 3" 16oz/sq.in. Emergency Vent - Male Thread - w/O-Ring, UL & ULC Listed, w Screen, EVR 11
244OM 0100 AV 4" 8oz/sq.in. Emergency Vent - Male Thread - w/O-Ring, UL & ULC 10
244OMB 0100 AV 4" 8oz/sq.in. Emergency Vent - BSP Male Thread - w/O-Ring, UL & ULC 10
244OMS 0100 AV 4" 8oz/sq.in. Emergency Vent - Male Thread - w/O-Ring - w/Screen, UL & ULC 10
244OMSB 0100 AV 4" 8oz/sq.in. Emergency Vent - Male British Pipe Thread - w/O-Ring - w/Screen, UL&ULC 10
244OM 0170 AV 4" 16oz/sq.in. Emergency Vent - Male Thread - w/O-Ring, UL & ULC 19
244OM 0170AVEVR 4" 16oz/sq.in. Emergency Vent - Male Thread - w/O-Ring, UL & ULC, EVR Approved 19
244OMS 0170AVEVR 4" 16oz/sq.in. Emergency Vent - Male Thread - w/O-Ring, UL & ULC, EVR Approved 19
244OM 0170 AVNP 4" 16oz/sq.in. Emergency Vent - Male Thread - w/O-Ring, Nickel Plated 19
244OMB 0170 AV 4" 16oz/sq.in. Emergency Vent - BSP Male Thread - w/O-Ring, UL & ULC 19
244OMBS 0170 AV 4" 16oz/sq.in. Emergency Vent - BSP Male Thread - w/O-Ring, w/Screen UL & ULC 19
244OMS 0170 AV 4" 16oz/sq.in. Emergency Vent - Male Thread - w/O-Ring - w/Screen, UL & ULC 19
244OMS 0170AVEVR 4" 16oz/sq.in. Emergency Vent - Male Thread - w/O-Ring - w/Screen, UL & ULC, EVR Approved 19
244OM 0800 AV 5" 8 oz Emergency Vent - Male Threaded w/O-Ring - UL&ULC 15
244OMS 0800 AV 5" 8 oz Emergency Vent - Male Threaded w/O-Ring, w/Screen - UL&ULC 15
244OM 0900 AV 5" 16 oz Emergency Vent - Male Threaded w/O-Ring - UL&ULC 28
244OM 0900AVEVR 5" 16 oz Emergency Vent - Male Threaded w/O-Ring - UL&UL, EVR Approved 28
244OMS 0900 AV 5" 16 oz Emergency Vent - Male Threaded w/O-Ring, w/Screen - UL&ULC 28
244OMS 0900AVEVR 5" 16 oz Emergency Vent - Male Threaded w/O-Ring, w/Screen - UL&ULC, EVR Approved 28
244OM 0200 AV 6" 8oz/sq.in. Emergency Vent - Male Thread - w/O-Ring, UL & ULC 20
244OM 0200AVEVR 6" 8oz/sq.in. Emergency Vent - Male Thread - w/O-Ring, UL & ULC, EVR Approved 20
244OMS 0200AVEVR 6" 8oz/sq.in. Emergency Vent - Male Thread - w/O-Ring, W/Screen,UL & ULC, EVR App. 20
244OMBSP 0200 AV 6" 8oz/sq.in. Emergency Vent - Male British Pipe Thread - w/O-Ring, UL & ULC Listed 20
244OMS 0200 AV 6" 8oz/sq.in. Emergency Vent - Male Thread - w/O-Ring - w/Screen, UL & ULC 20
244OMS 0200AVEVR 6" 8oz/sq.in. Emergency Vent - Male Thread - w/O-Ring - w/Screen, UL & ULC, EVR Approved 20
244OMSB 0200 AV 6" 8oz/sq.in. Emergency Vent - Male British Pipe Thread - w/O-Ring - w/Screen, UL&ULC 20
244OM 0400 AV 6" 16oz/sq.in. Emergency Vent - Male Thread - w/O-Ring, UL & ULC 37
244OM 0400AVEVR 6" 16oz/sq.in. Emergency Vent - Male Thread - w/O-Ring, UL & ULC, EVR Approved 37
244OMS 0400AVEVR 6" 16oz/sq.in. Emergency Vent - Male Thread - w/O-Ring, W/Screen, UL & ULC, EVR App. 37
244OMBSP 0400 AV 6" 16oz/sq.in. Emergency Vent - Male British Pipe Thread - w/O-Ring, UL & ULC Listed 37
244OMS 0400 AV 6" 16oz/sq.in. Emergency Vent - Male Thread - w/O-Ring - w/Screen, UL & ULC 37
244OMS 0400AVEVR 6" 16oz/sq.in. Emergency Vent - Male Thread - w/O-Ring - w/Screen, UL & ULC, EVR Approved 37
244OM 0600 AV 8" 8oz/sq.in. Emergency Vent - Male Thread - w/O-Ring, UL & ULC 44
244OM 0600AVEVR 8" 8oz/sq.in. Emergency Vent - Male Thread - w/O-Ring, UL & ULC, EVR Approved 44
244OMBSP 0600 AV 8" 8oz/sq.in. Emergency Vent - Male British Pipe Thread - w/O-Ring, UL & ULC Listed 44
244OM 0700 AV 8" 16oz/sq.in. Emergency Vent - Male Thread - w/O-Ring, UL & ULC 63
244OM 0700AVEVR 8" 16oz/sq.in. Emergency Vent - Male Thread - w/O-Ring, UL & ULC, EVR Approved 63
244OMBSP 0700 AV 8" 16oz/sq.in. Emergency Vent - Male British Pipe Thread - w/O-Ring 67
244OMI 0700 AV 8" 16oz/sq.in. Emergency Vent - Male Thread - O-Ring & Iron Body, UL & ULC Listed 71

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