MP Pumps 31872 HTO80 Flanged Hot Oil Pump End – 5.9" Impeller, 56C Frame
The MP Pumps 31872 is a HTO80 flanged pump end purpose-built for moving hot oil and thermal heat-transfer fluids where ordinary centrifugal pumps fall short. Its ductile iron housing and 5.9" enclosed impeller are engineered to handle continuous high-temperature service, and the flanged suction and discharge connections give installers a secure, leak-resistant way to tie into existing piping without relying on threaded joints that can loosen under thermal cycling.
This model ships as a PumPAK, meaning the pump end is ready to accept a close-coupled 56C frame motor that the customer supplies separately, keeping upfront costs down for shops that already stock compatible motors or need to match a specific horsepower. Inside, a carbon/silicon carbide mechanical seal paired with a Viton elastomer sits inside an isolated, air-cooled seal chamber, a combination that keeps seal temperatures in check even as the process fluid runs up to 650°F. A hardened 303 stainless steel drive sleeve adds an extra layer of wear resistance where the shaft meets the coupling.
Whether it's circulating thermal fluid through an asphalt plant's heating loop, supporting an OEM equipment package, or handling a manufacturing process that depends on stable high-temperature flow, the 31872 is built to run dependably shift after shift. It's an industrial workhorse first and foremost, suited to plants, process lines, and heat-transfer systems rather than any single niche market.
Key Features:
- Ductile iron pump housing and impeller built for long-term high-heat durability
- 5.9" enclosed impeller for strong, consistent flow and head performance
- Flanged suction and discharge for a secure, leak-resistant piping connection
- PumPAK design accepts a close-coupled 56C frame motor (motor sold separately)
- Carbon/silicon carbide mechanical seal with Viton elastomer for temperature resistance
- Isolated, air-cooled seal chamber protects the seal under extreme process heat
- Hardened 303 stainless steel drive sleeve for added wear resistance
- Rated for continuous operation up to 650°F
Applications:
- Hot oil and thermal fluid transfer systems
- Asphalt and road construction equipment
- Industrial process heating loops
- OEM heat-transfer equipment packages
- Manufacturing and chemical process circulation
Specifications:
- Part Number: 31872
- Model Designation: HTO80PPK D:CCMTR FA 56C 5.9 IMP F-FLG HD
- Pump Type: End suction centrifugal, PumPAK (pump end only, motor not included)
- Port Size: 1-1/2" suction x 1-1/4" discharge, flanged
- Impeller Diameter: 5.9"
- Maximum Flow: Up to 85 GPM
- Maximum Head: Up to 130 feet
- Motor Frame: 56C (NEMA C-face)
- Maximum Motor Rating: Up to 3 HP
- Maximum Operating Temperature: 650°F
- Housing Material: Ductile iron
- Seal Type: Carbon/silicon carbide with Viton elastomer
Frequently Asked Questions
Q: Does the MP Pumps 31872 come with a motor included?
A: No. It's a PumPAK pump end designed to accept a separately purchased close-coupled 56C frame motor.
Q: What kind of fluid is this pump meant to move?
A: It's engineered for hot oil and thermal heat-transfer fluid service, not general water transfer.
Q: How hot can the fluid be when running through this pump?
A: The HTO80 is rated for continuous operation up to 650°F, supported by its isolated, air-cooled seal chamber.
Q: Are the suction and discharge connections threaded or flanged on the 31872?
A: This model uses flanged suction and discharge connections rather than NPT threads.
Q: Is this pump limited to asphalt or oil industry use?
A: No. It works well anywhere a facility needs dependable high-temperature fluid circulation, including manufacturing heating loops and OEM equipment builds.
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