Does the liquid ammonia tank in the reformation unit need spray protection?
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Design fire protection codes require that for fully pressurized and semi-refrigerated liquid ammonia storage tanks, fixed water spray systems and mobile fire cooling water systems should be employed. Should the liquid ammonia tank of a reformation unit be equipped with spray protection? What are full-pressure and semi-frozen types? The fire cooling water system for fully frozen liquid ammonia storage tanks is designed in accordance with the requirements for steel single-layer protection tanks used on the outer walls of fully frozen liquefied hydrocarbon storage tanks. What is the concept of fully frozen?
What size counts as a storage tank? Our horizontal tank has a volume of 3.7 cubic meters; it actually serves as a buffer tank at the inlet of the ammonia compressor
Full-pressure type: The temperature inside the storage tank is usually at room temperature, and pressure is used to prevent liquid ammonia from vaporizing. Fully refrigerated type: A refrigerator is used to keep the temperature inside the storage tank below the boiling point of liquid ammonia, preventing it from vaporizing; operates at atmospheric pressure. Semi-frozen: somewhere in between the two. There is certain pressure, and the temperature must be low. 3.7 m3 is too small; there’s no need for fixed sprinklers – just ensure good insulation to prevent exposure to sunlight.
Is it time to spray now?
It’s time to spray now. For such small storage tanks, it is sufficient to refer to the guidelines for specialized ammonia-related treatment.