| http://www.w3.org/ns/prov#value | - A method of determining the extent of fouling in a heat exchanger including a plurality of tubes, the tubes of said heat exchanger being fouled to some degree, said method comprising the steps of:connecting a test reservoir to an inlet port and an outlet port of one of said tubes, said one of said tubes remaining in place in said heat exchanger; circulating a service fluid from said test reservoir
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