Transfer pumps keep material moving from the drums to the proportioner, so their condition is important for steady spray foam production. However, poor upkeep can interfere with the delivery of materials before the chemicals ever reach the heated hose.
WhenĀ maintaining transfer pumps for spray foam coatings, contractors should follow the service instructions for the exact pump model in their rig. Letās explore what contractors should watch for before maintenance delays client projects.
Watch for Leaks and Worn Seals
A transfer pump should move material without leaking around its seals or connections. During routine inspections, look closely at the pump body and supply hoses for signs of chemical residue. A developing leak may point to worn seals or a loose connection.
Graco recommends replacing transfer-pump seals as needed rather than waiting for a larger failure. Contractors should also inspect hoses and couplings before use, then correct any loose fluid connections before restarting the system.
Protect the Pump From Moisture
Moisture creates a particular concern on the isocyanate side of a spray foam system. Isocyanates can react with moisture, which can contribute to cured material forming inside equipment.
Keep drum openings protected and use the drying equipment specified for the system! Avoid leaving the pump exposed to moist air during shutdowns. Isocyanate materials are highly moisture-sensitive, so proper material protection is crucial to pump care.
Keep the Air Supply in Good Condition
Pneumatic transfer pumps depend on clean compressed air for reliable operation. However, having moisture in the air supply can affect the system over time, so contractors should inspect air-treatment components according to their manufacturerās instructions.
Drain the air filter when required and watch for unusual pump movement during operation. Your maintenance frequency should still depend on actual operating conditions, which is why service history is especially useful when deciding how often a pump needs attention.
Follow Proper Shutdown Procedures
Good maintenance continues after spraying stops. Follow the manufacturerās shutdown procedure to prevent material from curing around exposed pump components.
For some Graco rigs, itās important to stop certain pumps at the bottom of their stroke during overnight shutdown. This position helps prevent material from drying on the displacement rod and damaging the throat packings. Never improvise flushing or storage procedures with chemicals that the pump manufacturer has not approved.
Make Pump Care Part of Rig Maintenance
Maintaining transfer pumpsĀ is a crucial part of the entireĀ spray foam coatingĀ system, so contractors should inspect them along with the hoses and air supply during scheduled rig service. Keeping records can reveal recurring wear before it causes unexpected downtime.
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