AMT 3891-K8 Stainless Steel Self-Priming Centrifugal Pump Kit, 56J Frame
If you're rebuilding or replacing a self-priming pump on a chemical processing line, a wastewater system, or an agricultural setup, the AMT 3891-K8 gives you the full pump built around AMT's proven 300 Series stainless steel design, supplied unassembled so it can be built up to match your exact application. It's the kit version of the assembled 3891-98 pump, meaning you get the same core engineering — a 1-1/2 HP investment-cast stainless steel construction with a stainless steel impeller — but with the flexibility of putting it together yourself or having your maintenance team handle the assembly in-house.
This pump is built around a dual volute design that keeps radial load off the motor bearing, which translates into a longer service life even when the pump is run hard, day after day. It's rated for a maximum flow of 132 GPM and a maximum head of 63 feet, with self-priming capability up to 6 feet, so it can pull liquid from a tank or sump without needing to be flooded first. The Teflon mechanical seal and stainless steel shaft seal are what make this pump comfortable handling more aggressive fluids than a standard water pump would tolerate, including mild acids, fertilizers, and process chemicals.
Because it ships unassembled, the 3891-K8 is a practical choice for facilities that keep spare components on hand, distributors building custom configurations, or technicians who prefer to inspect and assemble every part themselves before the pump goes into service. It pairs a 1.5 HP, single-phase, 115/230V TEFC motor on a 56J frame with 1-1/2" NPT suction and discharge ports, giving you a compact, drop-in footprint that matches the assembled 3891-98 once built.
Key Features
- Investment-cast 300 Series stainless steel pump casing with stainless steel impeller
- Teflon mechanical seal with stainless steel shaft seal for chemical compatibility
- Dual volute design to reduce radial bearing load and extend motor life
- Self-priming to 6 feet, eliminating the need for a flooded suction line
- Totally Enclosed Fan Cooled (TEFC) motor for dust and moisture resistance
- Supplied unassembled for custom builds, training, or in-house assembly
- Handles liquids with specific gravity up to 1.3 and viscosity up to 100 SSU
Applications
- Chemical processing and chemical transfer systems
- Wastewater and industrial water treatment
- Agricultural fertilizer and fumigant pumping
- General industrial liquid transfer where corrosion resistance is required
- OEM and distributor pump assembly programs
Specifications
- Port Size: 1-1/2" NPT suction and discharge
- Motor: 1.5 HP, TEFC, single phase
- Voltage: 115/230 VAC, 60 Hz
- Motor Frame: 56J
- Maximum Flow: 132 GPM
- Maximum Head: 63 ft.
- Self-Priming Lift: Up to 6 ft.
- Casing Material: 300 Series Investment Cast Stainless Steel
- Impeller Material: Stainless Steel
- Seal Type: Teflon Mechanical Seal / Stainless Steel
- Maximum Specific Gravity: 1.3
- Maximum Viscosity: 100 SSU
- Configuration: Unassembled kit (matches assembled model 3891-98)
Frequently Asked Questions
Q: Does the AMT 3891-K8 come pre-assembled or as separate parts?
A: The 3891-K8 ships unassembled. It contains the same components as the assembled AMT 3891-98 pump, but assembly is left to the buyer or installer.
Q: Can this pump handle mild chemicals, or is it for water only?
A: It's designed for more than plain water. The stainless steel construction and Teflon mechanical seal allow it to handle mild chemicals, fertilizers, and fluids with specific gravity up to 1.3.
Q: What size fittings does this pump kit use for installation?
A: It uses 1-1/2" NPT threaded connections on both the suction and discharge sides, so it works with standard 1-1/2" pipe and fittings.
Q: Is this pump suitable for continuous-duty industrial use?
A: Yes. The TEFC motor and dual volute casing design are built for regular industrial duty, including chemical transfer and wastewater applications where pumps run for extended periods.
Q: Will the assembled 3891-K8 match the performance of the 3891-98?
A: Yes. Since the kit contains the same components, once assembled it performs to the same specifications as the factory-assembled AMT 3891-98.
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