Burks ES8M Turbine Pump Only – Bronze Fitted Cast Iron Pump End

Burks ES8M Turbine Pump Only – Base Mounted Regenerative Turbine Pump End

The Burks ES8M is a base mounted regenerative turbine pump supplied as a pump end only, which means the casing, raceway, impeller, shaft and bearing housing arrive ready to be paired with the motor, coupling, base and coupling guard of your choosing. That flexibility is exactly why maintenance departments keep this model on the shelf. When an existing ES8M finally wears out after years of service, the driver is often still perfectly good, and replacing only the wet end gets the system back online at a fraction of the cost of a complete package.

Regenerative turbine pumps work differently from ordinary centrifugal pumps. Instead of throwing liquid outward in a single pass, the ES8M's bronze impeller carries fluid through a bronze raceway with cast-in vortex pockets, adding energy repeatedly as it travels around the housing. The result is high discharge pressure from a compact, low-flow package, which suits jobs where a conventional centrifugal pump would need multiple stages or a much larger footprint. The impeller itself is bronze with Monel blades and is the only moving part in the liquid path, riding on a 303 stainless steel shaft sealed by a carbon and ceramic mechanical seal rated to 225°F.

Burks builds the ES8M around bronze fitted cast iron construction, so it stands up well to clear water, condensate, glycol solutions and other clean, non-abrasive liquids up to about 200 SSU viscosity. The Life-Lok external impeller adjustment deserves particular mention: as internal clearances open up with wear, a technician can restore them from outside the pump without breaking piping or pulling the unit off its base, which meaningfully extends useful life between overhauls. Add self-priming operation and a bronze raceway that resists vapor lock, and the ES8M becomes a dependable choice for boiler feed, condensate return, hot and cold water circulation, pressure boosting and high pressure spray duty across industrial plants, commercial buildings, laundries, car washes and process lines.

Key Features

• Supplied as pump end only — motor, coupling, base and coupling guard are ordered separately
• Regenerative turbine design delivers high discharge pressure at low flow rates
• Self-priming operation once the pump is initially filled
• Bronze impeller with Monel blades is the only moving part in the liquid path
• Bronze raceway with cast-in vortex pockets helps resist vapor lock
• Life-Lok external impeller adjustment restores running clearances without disturbing piping
• Bronze fitted cast iron construction for long service in clean, non-abrasive liquids
• Compact, space-saving footprint compared with multistage centrifugal alternatives
• Carbon and ceramic mechanical shaft seal for temperatures to 225°F
• Each pump is factory tested before shipment

Applications

• Boiler feed and boiler make-up water
• Condensate return and low-pressure steam systems
• Hot and cold water circulation loops
• Heat transfer and process temperature control systems
• Pressure boosting for buildings and process lines
• High pressure spray, washing and rinsing systems
• Car wash, laundry and commercial kitchen equipment
• Glycol and clean, non-abrasive low-viscosity liquid transfer
• Chemical feed and metering duty with compatible clean fluids
• OEM equipment requiring a compact high-head, low-flow pump end

Specifications

• Model: ES8M
• Brand: Burks
• Pump Type: Regenerative turbine
• Configuration: Base mounted, pump end only (no motor)
• Suction Port Size: 1-1/4 in. NPT
• Discharge Port Size: 1 in. NPT
• Nominal Speed: 3500 RPM at 60 Hz
• Casing Material: Cast iron
• Adapter Material: Cast iron
• Bearing Housing Material: Cast iron
• Raceway Material: Bronze
• Impeller Material: Bronze with Monel blades
• Shaft Material: 303 stainless steel
• Mechanical Seal: Carbon / ceramic / stainless steel / Buna-N
• Maximum Liquid Temperature: 225°F (107°C) with standard Buna-N seal
• Maximum Inlet Pressure: 100 PSI (689 kPa)
• Maximum Casing Working Pressure: 250 PSI (1724 kPa)
• Maximum Viscosity: 200 SSU
• Priming: Self-priming after initial fill
• Impeller Adjustment: Life-Lok external adjustment
• Liquids Handled: Clear water and other clean, non-abrasive, low-viscosity liquids

Frequently Asked Questions

Q: Does the Burks ES8M include a motor?

A: No. The ES8M is sold as a pump end only. The motor, coupling, base plate and coupling guard are separate items, so you can match the pump to a driver you already own or specify a new motor with the enclosure, voltage and phase your installation requires.

Q: What size motor should be paired with the ES8M pump end?

A: Motor selection depends on the flow and total head your system demands, since a regenerative turbine draws more power as discharge pressure climbs. Identify your required GPM and head first, then size the motor from the ES series performance curve for the operating point rather than choosing horsepower by habit.

Q: Can the ES8M run dry or handle liquids with solids in them?

A: No on both counts. The mechanical seal depends on the pumped liquid for lubrication, so dry running will damage it quickly. Abrasive particles are equally hard on the tight impeller-to-raceway clearances that give a regenerative turbine its pressure, so a suction strainer is strongly recommended on any questionable supply.

Q: How does the Life-Lok external impeller adjustment work in practice?

A: Normal wear gradually widens the clearance between the impeller and the raceway, which shows up as reduced pressure at the same speed. Life-Lok lets a technician take that clearance back up from outside the pump, so performance is restored without disconnecting piping, pulling the pump from its base or disassembling the wet end.

Q: What is the difference between the ES8M and the stainless steel ES8M-SS version?

A: The ES8M uses bronze fitted cast iron construction, which is the standard choice for water, condensate and similar clean liquids. The ES8M-SS substitutes stainless steel wetted components for service with liquids that would attack cast iron and bronze, such as deionized water and mildly corrosive process fluids.