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{short description of image}     MORRISON BROS - PRESSURE/VACUUM VENTS
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548 SERIES
Pressure/Vacuum Vent with Gauge Hatch

Figure 548
Figure 548
For "normal" venting of aboveground storage tanks. Allows tank to "breathe" during filling and discharging operations. Pressure/vacuum poppets seal vapors in the tank when pressure is equalized. This vent must be used in conjunction with an emergency vent and 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.

Construction Details
Fig 548. . . . . .Brass Body & Hood. Brass (raised) metal-to-metal seats/poppets.
Fig 548A. . . . . .Aluminum Body & Hood. Brass (raised) metal-to-metal seats/poppets. 2" available with British Pipe Threads.
Standard Features
1. Brass (raised) metal-to-metal seats/poppets.
2. Threaded gauge hatch for manual gauging access.
3. Horizontal discharge with field-adjustable , tripolar orientation.


Download Product Specification (PDF)

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 & 30, 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. Normal vents such as pressure vacuum and updraft vents for aboveground storage tanks should be sized according to NFPA 30 (2008) 21.4.3

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748 SERIES
Pressure/Vacuum Vent

Figure 748
Figure 748
For "normal" venting of aboveground storage tanks. Allows tank to "breathe" during filling and discharging operations. Pressure/vacuum poppets seal vapors in the tank when pressure is equalized. This vent must be used in conjunction with an emergency vent and it is RECOMMENDED that the opening pressure setting is set below that of the emergency vent so the normal vent operates first.

Construction Details
Poppets. . . . . . . . . . . . . Brass
Standard Features
1. Aluminum body & hood
2. Horizontal discharge with field adjustable, tripolar orientation.
3. Optional pressure discharge NPT hood.


Download Product Specification (PDF)


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748ALT SERIES
Pressure/Vacuum Vent
for Ag-Chemical

Figure 748ALT
Figure 748ALT
Vent valve used with aqua-ammonia and ag-chemical products, allowing tank to "breathe" during filling and discharging operations. Poppets seal vapors in the tank when pressure is equalized. Settings are approximate.

Construction Details
Size. . . . . . . . . . . . . 2" NPT
Body & Cap. . . . . .Aluminum
Poppets . . . . . . . . .Teflon® coated aluminum
Screens. . . . . . . . . .Stainless Steel
Options: (must specify)
1. Male NPT connection for dryer application
2. Pressure discharge NPT hood



   
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