Roper Pump 3658HBFRV 3600 Series Gear Pump, 4 inch Flanged Ports with Relief Valve
The Roper 3658HBFRV is one of the large frame 3600 Series pumps, built with 4 inch flanged ports, an outboard ball bearing, an internal relief valve and a packed box. At size 58 it displaces 0.58 gallons per revolution, delivering up to 379.5 gallons per minute at its 609 revolutions per minute maximum, at differential pressures to 125 pounds per square inch.
Large frame pumps behave differently from the small ones in ways that matter at installation. The maximum speed comes down as the gears grow, so a 58 runs slower than an 11 while moving far more liquid per turn, and the suction line has to be sized for that volume rather than for the port thread. Pipe strain becomes a real risk at 4 inch flanges, so the pipework needs supporting independently rather than being carried by the pump. And because the case gasket sets the stack height between faceplate, case and backplate, the correct cut gaskets matter more here than anywhere: a small clearance error costs far more slip on gears this size. Steam jacketing, alternative bushings and other sealing arrangements are offered on this frame.
Key Features
- Genuine Roper Pump Company 3600 Series gear pump, model 3658HBFRV
- Large frame 58 size with 4 inch flanged ports
- Outboard ball bearing and internal relief valve
- Up to 379.5 gallons per minute at 609 revolutions per minute, to 125 pounds per square inch
- Heavy duty cast iron helical gear construction, packed box sealing
- Steam jacketing, bushing and sealing options offered on this frame
Applications
- High volume loading, unloading and cargo transfer
- Residual fuel oil and heavy crude handling
- Asphalt, molasses and resin movement
- Refinery, terminal and process plant duty
- Barge and tanker transfer packages
Specifications
- Brand: Roper Pump Company
- Model: 3658HBFRV
- Series: 3600 Series heavy duty gear pump, large frame
- Theoretical Displacement: 0.58 gallons per revolution
- Maximum Speed: 609 revolutions per minute
- Maximum Flow: 379.5 gallons per minute at maximum speed
- Maximum Differential Pressure: 125 pounds per square inch
- Port Connection: 4 inch flanged
- Temperature: Standard build to 212 degrees Fahrenheit, buildable to 450 degrees Fahrenheit
- Shaft Seal: Packed box
- Options: Steam jacketing, alternative bushings and sealing arrangements
- Shipping: Moves by truck freight
- Condition: New
Frequently Asked Questions
Q: Why is the maximum speed lower than on the small frames?
Bigger gears have more mass to accelerate and more area exposed to pressure, and they need longer to fill each revolution. Roper rates the large frames slower for all three reasons.
Q: How much suction line does a pump this size need?
More than the port size alone suggests. Size the inlet on velocity at the actual duty, and keep it short, full bore and free of high points where vapor can collect.
Q: Do the case bolts need re-torquing after commissioning?
Checking them once the pump has reached working temperature is good practice on the large frames, because the gasketed stack settles as it warms.
Q: Can it be lifted by the pipework flanges?
Never. Use the lifting points and support the pipework separately. A casing that is carrying pipe weight distorts, and the bearings and packing take the consequences.
Not sure this is the right part? Send us a Picture of the pump plate on your pump and the CLR Marine team will confirm the correct 3600 Series pump model before you order.
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