Tube wall thickness depends on the corrosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than _____________ mm outside diameter is generally not recommended for fouling fluids ?
Correct answer: B. 19
- A. 16
- B. 19
- C. 28
- D. 38
Explanation
Tubes smaller than about 19 mm outside diameter are generally avoided for fouling fluids because deposits rapidly restrict their flow area and make mechanical cleaning difficult. Larger tubes provide better fouling tolerance and maintenance access.
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