Design of 100 cubic meter methanol storage tank
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I would like to ask the experts here. Our factory needs to design a 100-cubic-meter methanol storage tank. Is it feasible to take the following measures? 1. A horizontal, 100-cubic-meter, atmospheric-pressure steel storage tank is used. 2. The storage tank is equipped with a vent valve and a flame arrester to maintain constant pressure. 3. The storage tank facility is equipped with a fixed cooling spray system to prevent overpressure due to temperature increases in summer and to reduce breathing losses. 4. The storage tank is equipped with a magnetic floating board level gauge at the installation site, as well as an intelligent differential pressure transmitter to enable remote monitoring of the liquid level; in addition, high and low level alarm functions are provided. However, there is no intention to install a high liquid level alarm or an interlock device for the unloading pump. 5. The storage tank is equipped with an on-site thermometer, but no temperature transmission system is installed. Are the above facilities feasible? If this is not feasible, please identify the relevant regulatory basis and provide suggestions for improvement. Thank you!
Secondly, a nitrogen seal and balance tube should also be installed； Article 4: No high liquid level setting is allowed, nor can the pump be stopped ； Article 5: It shall not be spread over long distances ； Take a look at the safety prevention measures for the first batch of hazardous chemicals under strict supervision
Thank you so much! Article 2: In accordance with the Petrochemical Regulations 6.2.4, when storing Class A/B liquids in fixed-roof tanks or low-pressure storage tanks, measures should be taken to reduce temperature rise due to sunlight exposure, in order to prevent excessive evaporation of oil and gas and improve the safety of the storage tanks. The measures mainly include a fixed cooling water spray (mist) system, gas venting or gas condensation and recycling, nitrogen blanketing, or applying qualified thermal insulation coatings. For storage tanks equipped with insulation or thermal insulation layers, sunlight has little impact on them, so there is no need to take additional measures to protect them from sunlight. 6.2.2 For liquid materials of Class A B and Class B A with special requirements, such as styrene, esters, hydrogenation feedstocks, and other liquids that are prone to polymerization or oxidation, it is also feasible to use fixed-roof storage tanks with nitrogen blanketing for storage ； For materials with high saturated vapor pressures such as dew point oil and light naphtha, they can be stored in fixed-roof tanks by cooling down, or in low-pressure fixed-roof tanks. Does setting up a vent valve and a flame arrester mean that we no longer need to install a nitrogen seal? Article 4: High liquid level and pump shutdown interlock – is there a standard source for this? I remember it seems that interlocking is required for volumes over 2,500 cubic meters. Please feel free to correct me; thank you very much!
It is still recommended to install a interlock that shuts down the pump when the liquid level is too high. Given the increasingly strict regulations on VOCS, a nitrogen seal is also necessary