Bolden states that for every foot of hose length used you lose the equivalent of one cubic foot per minute (CFM) in vacuum flow. A typical hose is corrugated in construction for flexibility, but that causes turbulence, which impedes flow.
He notes that pump efficiency and maintaining your vacuum pressure is important, but these devices can be operating correctly and still have their performance negatively affected by hose restrictions.
Bolden adds that lift and flow work together to move the water from the source to the recovery tank. Lift without flow will not move any water — the two must work together.
According to Bolden, the efficiency of lift or flow can be improved individually, but if the capability of one is not raised with the other or there is an imbalance of capabilities, you cannot realize improvement in overall efficiency.
Kurt Bolden is founder and president of Bold Core Response, Inc., a disaster response firm, the Hydro Lab, a training and research facility as well as an IICRC-approved school, and Kurt''s Carpet & Upholstery Cleaning, in Noblesville, IN. He is an IICRC-approved instructor for Applied Structural Drying (ASD) and has more than 30 years of experience in the industry. He can be reached at firstname.lastname@example.org.
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