Avoid Cavitation Damage - Yamaha PW3028A Service Manual

AVOID CAVITATION DAMAGE

One or several of the conditions shown in the chart below may contribute to cavitation in a system resulting in
premature wear, system downtime and unnecessary operating costs.
CONDITION
Inadequate Inlet Line Hose Size
Water Hammering Liquid
Acceleration/Deacceleration
Rigid Inlet Plumbing
Excessive Elbows in Inlet Plumbing
Excessive Liquid Temperature
Air Leaks in Plumbing
Agitation in Supply Tank
Clogged Filters
 Increase hose size to hose size 3/4"-5/8".
 Hose should be no longer than 50'.
 Use flexible wire reinforced hose to absorb pulsation and pressure
spikes.
 Keep elbows to a minimum and less than 90°.
 Use Thermo Valve in bypass line.
 Do not exceed pump temperature 104°F.
 Substitute closed loop with baffled holding tank.
 Adequately sized tank for frequent or high volume bypass.
 Pressure feed high temperature liquids.
 Check all connections.
 Use PTFE thread tape or pipe thread sealant.
 Size tank according to pump output - Minimum 6-10 times system GPM.
 Baffle tank to purge air from liquid and separate inlet form discharge.
 Perform regular maintenance or use clean filters to monitor build up.
 Use adequate mesh size for liquid and pump specifications.
CAVITATION DAMAGE
12
SOLUTION
Fig. 3