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Category: Refining
Question: What is an effective method of measuring flow in flare lines?
Keywords: v1i3,flare,line,flow,measurement
Answer: Orifice plates, a natural first choice, are generally not suitable for this service. The reason is that the the flare line is always sized for the maximum possible flare flow in an upset condition. The flow to the flare under normal conditions will be smaller by a factor of 100 to 1000. The pressure drop across the orifice under normal conditions will not be high enough to permit accurate flow measurement. There have been many attempts to find a suitable flowmeter for this service. Utrasonic flowmeters have consistently performed well. They also provide the advantage of having no obstruction in the line. The best-known supplier is Panametrics. They have an excellent reference list in refineries and chemical plants. The only disadvantage is the cost - on the order of $30,000 per installation.
Links: Visit Panametrics Website