// CODE SNIPPET
66.27.8 Vent Piping
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Vent piping shall be designed, constructed, and installed in accordance with this section. [30:27.8]
Where the outlets of vent pipes for tanks storing Class I liquids are adjacent to buildings or public ways, they shall be located so that vapors are released at a safe point outside of buildings and not less than 12 ft (3.6 m) above the adjacent ground level. [30:27.8.1.1]
Vapors shall be discharged upward or horizontally away from adjacent walls. [30:27.8.1.2]
Vent outlets shall be located so that vapors will not be trapped by eaves or other obstructions and shall be at least 5 ft (1.5 m) from building openings and at least 15 ft (4.5 m) from powered ventilation air intake devices. [30:27.8.1.3]
Manifolding of vent piping shall be prohibited except where required for special purposes such as vapor recovery, vapor conservation, or air pollution control. [30:27.8.1.4]
Vent piping for tanks storing Class I liquids shall not be manifolded with vent piping for tanks storing Class II or Class III liquids unless positive means are provided to prevent the following:
- Vapors of Class I liquids from entering tanks storing Class II or Class III liquids
- Contamination
- Possible change in classification of the less volatile liquid
[30:27.8.1.5]
Piping to or from approved emergency vent devices for atmospheric and low-pressure tanks shall be sized to provide emergency vent flows that limit the back pressure to less than the maximum pressure permitted by the design of the tank. Piping to or from approved emergency vent devices for pressure vessels shall be sized in accordance with the ASME Boiler and Pressure Vessel Code. [30:27.8.1.6]
Vent pipe outlets shall be located and directed so that vapors will not accumulate or travel to an unsafe location, enter building openings, or be trapped under eaves and shall be at least 5 ft (1.5 m) from building openings and at least 15 ft (4.5 m) from powered ventilation air intake devices. [30:27.8.2.2]
Vent pipes shall not be obstructed by devices provided for vapor recovery or other purposes unless the tank and associated piping and equipment are otherwise protected to limit back-pressure development to less than the maximum working pressure of the tank and equipment by the provision of pressure-vacuum vents, rupture discs, or other tank-venting devices installed in the tank vent lines. [30:27.8.2.3]
Vent outlets and devices shall be protected to minimize the possibility of blockage from weather, dirt, or insect nests. [30:27.8.2.4]
Vent piping shall be sized in accordance with Table 66.23.6.2. [30:27.8.2.5]
Vent outlets shall be above normal snow level. [30:27.8.2.7]
Vent pipes shall be permitted to be fitted with return bends, coarse screens, or other devices to minimize ingress of foreign material. [30:27.8.2.8]
Vent pipes and vapor return piping shall be installed without sags or traps in which liquid can collect. [30:27.8.2.9]
Vent piping for tanks storing Class I liquids shall not be manifolded with vent piping for tanks storing Class II or Class III liquids unless positive means are provided to prevent the following:
- Vapors of Class I liquids from entering tanks storing Class II or Class III liquids
- Contamination
- Possible change in classification of the less volatile liquid
[30:27.8.2.13]
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