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Morrison Brothers 748ALT 2 in. FNPT, AG-Chemical, Pressure Vacuum Vents
Brass Internals, E85 and Bio-Diesel Compatible
Ships From Manufacturer
Select Model & Quantity:
| Model # | Description | Price | Qty |
|---|---|---|---|
| 748ALT0100 AV | 8oz/sq.in. | $273.60 | |
| 748ALT0200 AV | 16oz/sq.in. | $280.96 | |
| 748ALT0300 AV | 32oz/sq.in. | $312.13 | |
| 748ALT0800 AV | 8oz/sq.in. w/Dryer Connection | $394.42 | |
| 748ALT0900 AV | 16oz/sq.in. w/Dryer Connection | $401.49 | |
| 748ALT1400 AV | 8oz/sq.in. w/Pressure Discharge Hood | $421.92 | |
| 748ALT1500 AV | 16 oz/sq.in. w/Pressure Discharge Hood | $429.12 | |
| 748ALT2000 AV | 8oz/sq.in. w/Dryer w/Pressure Discharge Hood | $542.57 | |
| 748ALT2100 AV | 16 oz/sq.in. w/Dryer w/Pressure Discharge Hood | $549.34 |
Morrison Brothers 748ALT 2 in. FNPT, AG-Chemical, 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
- Teflon® coated poppets and seats
- Stainless steel screens
| Figure | Suffix | Size | Description | Weight (lbs) |
|---|---|---|---|---|
| 748ALT | 0100 AV | 2" 8oz/sq.in. | Pressure Vacuum Vent | 5.5 |
| 748ALT | 0200 AV | 2" 16oz/sq.in. | Pressure Vacuum Vent | 5.5 |
| 748ALT | 0300 AV | 2" 32oz/sq.in. | Pressure Vacuum Vent | 5.5 |
| 748ALT | 0800 AV | 2" 8oz/sq.in. | Pressure Vacuum Vent w/Dryer Connection | 6 |
| 748ALT | 0900 AV | 2" 16oz/sq.in. | Pressure Vacuum Vent w/Dryer Connection | 6 |
| 748ALT | 1400 AV | 2" 8oz/sq.in. | Pressure Vacuum Vent w/Pressure Discharge Hood | 5 |
| 748ALT | 1500 AV | 2" 16 oz/sq.in. | Pressure Vacuum Vent w/Pressure Discharge Hood | 5 |
| 748ALT | 2000 AV | 2" 8oz/sq.in. | PV Vent w/Dryer w/Pressure Discharge Hood | 5.5 |
| 748ALT | 2100 AV | 2" 16 oz/sq.in. | PV Vent w/Dryer w/Pressure Discharge Hood | 5.5 |
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.