Seeking advice on the installation of a breather valve for a horizontal underground methanol storage tank
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This post was last edited by fukuzawayumi on 2010-3-19 16:37 regarding the installation issues of the breather valve on a horizontal underground methanol storage tank. The capacity of the methanol tank is 50 m3, with a soil cover thickness of 50 mm. 1. Can seamless carbon steel be used for the material of the pipes connecting the breathing valve? 2. What should be the height of the vent opening above the soil cover layer? 3. What should be the installation height of the breather valve above the soil cover layer? Based on what criteria is this judged?
1. Can seamless carbon steel be used for the material of the pipes connecting the breathing valve? It’s okay. 2. What should be the height of the vent opening above the soil cover layer? 200 mm is sufficient, but 300 mm is better. 3. What should be the installation height of the vent valve above the surface of the covering soil? 500 mm above the ground or platform; 5 meters is better for safety reasons.
Thanks for the answer from above. 1. The length of the vent pipe is only 200–300 mm, while the installation height of the breathing valve is 500 mm; are these two connected by a 200-mm-long seamless carbon steel pipe? 2. Is the breather valve installed at the top of the vent pipe? 3. I have checked the relevant regulations regarding underground tank areas at gas stations; it states that the vent pipes should be at least 4 meters above the ground level, fire arresters must be installed, and breathing valves are not allowed.