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Lincoln air-operated drum pump 4491 with bung bushing, metal finish

Lincoln

Lincoln Air Operated Drum Pump 4491

SKU CH-TSNA-DQF17

Air-operated drum pump delivers up to 6 gpm at 500 psi for 275-gallon totes with a 3.5:1 ratio

  • Air powered operation delivers 6 gpm flow from 275 gal totes
  • 5:1 pressure ratio produces 500 psi outlet at 120 psi supply
  • 1/4 in FNPT air inlet and 1/2 in discharge ID simplify plumbing
  • Bung bushing included fits standard tote openings for quick setup
  • Operates from 20 psi minimum air pressure down to 30 Degrees F fluid temp

Lincoln Air Operated Drum Pump 4491

The Lincoln 4491 is an air operated drum pump designed for high volume fluid transfer. It mounts to a 275 gallon tote using the included bung bushing. The pump delivers a maximum flow rate of 6 gpm at a 3.5 : 1 pressure ratio. It operates on compressed air between 20 psi and 120 psi.

Suits high volume tote dispensing stations

This pump suits maintenance teams and industrial facilities moving lubricants or coolants from bulk totes. It requires a compressed air supply capable of 7 cfm at the inlet. Buyers needing a complete kit with a discharge hose should source that separately. Operations without a 1/4 inch FNPT air connection will need an adapter.

3.5 : 1 pressure ratio determines outlet pressure

The fixed 3.5 : 1 ratio means outlet pressure scales directly with the regulated air supply up to a maximum of 500 psi. Users must regulate input air to match the required fluid pressure for their application. The pump handles fluids down to 30 degrees Fahrenheit. The discharge outlet features a 1/2 inch ID tube with a 13/16 inch OD and FNPT connection.

Highlights

  • Air powered operation delivers 6 gpm flow from 275 gal totes
  • 5:1 pressure ratio produces 500 psi outlet at 120 psi supply
  • 1/4 in FNPT air inlet and 1/2 in discharge ID simplify plumbing
  • Bung bushing included fits standard tote openings for quick setup
  • Operates from 20 psi minimum air pressure down to 30 Degrees F fluid temp

Specifications

BrandLincoln

Questions about this item

Should I pick the basic pump package or look for one that includes a discharge hose?

The 4491 is sold as a basic pump without a discharge hose, so you will need to supply your own hose with a 1/2 in ID and 13/16 in OD FNPT connection.

What does the 6 gpm maximum flow rate mean when the pump is running on my compressor?

At the rated 7 cfm air consumption and up to 120 psi supply pressure, the pump can deliver up to 6 gallons per minute of oil through the 1/2 in discharge tube.

How does the 1/4 in FNPT air inlet and 3.5:1 ratio limit the pressure I can get at the outlet?

With a minimum 20 psi and maximum 120 psi air supply, the 3.5:1 ratio caps outlet pressure at 500 psi, so your system must handle that pressure range.

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