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Morrison Brothers 748A 2 in. FNPT, Pressure Vacuum Vents
Brass Internals, E85 and Bio-Diesel Compatible
Ships From Manufacturer
Select Model & Quantity:
| Model # | Description | Price | Qty |
|---|---|---|---|
| 748A--0100 AV | 2 in. NPT, 2oz/sq.in., Brass Internals | $243.98 | |
| 748A--0200 AV | 2 in. NPT, 4oz/sq.in., Brass Internals | $255.67 | |
| 748A--0300 AV | 2 in. NPT, 6oz/sq.in., Brass Internals | $262.83 | |
| 748A--0400 AV | 2 in. NPT, 8oz/sq.in., Brass Internals | $270.00 | |
| 748A--0500 AV | 2 in. NPT, 12oz/sq.in., Brass Internals | $277.17 | |
| 748A--0600 AV | 2 in. NPT, 16oz/sq.in., Brass Internals | $284.34 | |
| 748A--0700 AV | 2 in. NPT, 2oz/sq.in., Brass Internals w/Dryer Conn | $378.86 | |
| 748A--0800 AV | 2 in. NPT, 4oz/sq.in., Brass Internals w/Dryer Conn | $371.62 | |
| 748A--0900 AV | 2 in. NPT, 6oz/sq.in., Brass Internals w/Dryer Conn | $378.39 | |
| 748A--1000 AV | 2 in. NPT, 8oz/sq.in., Brass Internals w/Dryer Conn | $385.16 | |
| 748A--1100 AV | 2 in. NPT, 12oz/sq.in., Brass Internals w/Dryer Conn | $391.95 | |
| 748A--1200 AV | 2 in. NPT, 16oz/sq.in., Brass Internals w/Dryer Conn | $398.72 | |
| 748A--1500 AV | 2 in. NPT, 8oz/sq.in., Brass Internals, With Pressure Discharge Hood | $417.12 | |
| 748A--3100 AV | 3 in. NPT, 2oz/sq.in., Brass Internals | $432.50 | |
| 748A--3200 AV | 3 in. NPT, 4oz/sq.in., Brass Internals | $434.85 | |
| 748A--3300 AV | 3 in. NPT, 6oz/sq.in., Brass Internals | $437.20 | |
| 748A--3400 AV | 3 in. NPT, 8oz/sq.in., Brass Internals | $439.54 | |
| 748A--3500 AV | 3 in. NPT, 12oz/sq.in., Brass Internals | $441.91 | |
| 748A--3600 AV | 3 in. NPT, 16oz/sq.in., Brass Internals | $444.26 | |
| 748A--4100 AV | 3 in. NPT, 2oz/sq.in., Brass Internals, With Dryer Connection | $602.90 | |
| 748A--4200 AV | 3 in. NPT, 4oz/sq.in., Brass Internals, With Dryer Connection | $605.27 | |
| 748A--4300 AV | 3 in. NPT, 6oz/sq.in., Brass Internals, With Dryer Connection | $607.63 | |
| 748A--4400 AV | 3 in. NPT, 8oz/sq.in., Brass Internals, With Dryer Connection | $610.01 | |
| 748A--4500 AV | 3 in. NPT, 12oz/sq.in., Brass Internals, With Dryer Connection | $612.38 | |
| 748A--4600 AV | 3 in. NPT, 16oz/sq.in., Brass Internals, With Dryer Connection | $614.77 | |
| 748ABSP0500 AV | 2 in. NPT, 12oz/sq.in., Brass Internals, BSP Threads | $293.28 | |
| 748ABSP3100 AV | 3 in. NPT, 2oz/sq.in., Brass Internals, BSP Threads | $470.59 | |
| 748ABSP3300 AV | 3 in. NPT, 6oz/sq.in., Brass Internals, BSP Threads | $475.71 | |
| 748ABSP3600 AV | 3 in. NPT, 16oz/sq.in., Brass Internals, BSP Threads | $483.38 |
Morrison Brothers 748A 2 in. FNPT, Pressure Vacuum Vents
Specification SheetPressure vacuum vent designed for installation on top of the vent pipe of an aboveground or underground storage tank. Poppets seal vapors in the tank when pressure is equalized. The vent allows the tank to -Breathe during filling and dispensing operations. This vent must be used in conjunction with an emergency vent. It is recommended that the opening pressure setting is set below that of the emergency vent so the normal vent operates first. Settings are approximate.
Standard Features
- Vents outward and upward in compliance with NFPA 30
- Tri-polar mounting screws for mounting exhaust hood in any of three positions
- Optional dryer connections accommodate the installation of desiccant dryers on vacuum connection
- Optional pressure discharge hood facilitates piping pressure relief to desired discharge point
Construction Details
- Aluminum body and hood
- Brass poppets and seats
- Stainless steel screens
| Figure | Suffix | Size | Description | Weight (lbs) |
|---|---|---|---|---|
| 748A | 3100 AV | 3" 2oz/sq.in. | Pressure Vacuum Vent, Aluminum Body | |
| 748A | 3200 AV | 3" 4oz/sq.in. | Pressure Vacuum Vent, Aluminum Body | |
| 748A | 3300 AV | 3" 6oz/sq.in. | Pressure Vacuum Vent, Aluminum Body | |
| 748A | 3400 AV | 3" 8oz/sq.in. | Pressure Vacuum Vent, Aluminum Body | |
| 748A | 3500 AV | 3" 12oz/sq.in. | Pressure Vacuum Vent, Aluminum Body | |
| 748A | 3600 AV | 3" 16oz/sq.in. | Pressure Vacuum Vent, Aluminum Body | |
| 748A | 4100 AV | 3" 2oz/sq.in. | Pressure Vacuum Vent, Aluminum Body, With Dryer Connection | |
| 748A | 4200 AV | 3" 4oz/sq.in. | Pressure Vacuum Vent, Aluminum Body, With Dryer Connection | |
| 748A | 4300 AV | 3" 6oz/sq.in. | Pressure Vacuum Vent, Aluminum Body, With Dryer Connection | |
| 748A | 4400 AV | 3" 8oz/sq.in. | Pressure Vacuum Vent, Aluminum Body, With Dryer Connection | |
| 748A | 4500 AV | 3" 12oz/sq.in. | Pressure Vacuum Vent, Aluminum Body, With Dryer Connection | |
| 748A | 4600 AV | 3" 16oz/sq.in. | Pressure Vacuum Vent, Aluminum Body, With Dryer Connection |
Note: Normal vents such as pressure vacuum and updraft vents foraboveground storage tanks should be sized according to NFPA 30 (2012) 21.4.3.
WARNING: DO NOT FILL OR UNLOAD FUEL FROM A STORAGE TANK UNLESS IT IS CERTAIN THAT THE TANK VENTS WILLOPERATE 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 air flow 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.