Roper Pump 3711HBFRV 3600 Series Gear Pump with Mechanical Seal and Flanged Ports
The Roper 3711HBFRV is the mechanically sealed build of the 3600 Series in the 11 size, with flanged ports, an outboard ball bearing and an integral relief valve. The second digit of the figure number is what marks it out: 6 is the packed box, 7 is the lapped face mechanical seal. Displacement is 0.11 gallons per revolution, giving up to 84.8 gallons per minute at the 750 revolutions per minute maximum, at differential pressures to 125 pounds per square inch.
A mechanical seal is chosen where product leakage is unacceptable. Packing is designed to weep slightly so the rings stay lubricated and cool, and on many products that is perfectly acceptable, but on anything that cannot be allowed to reach the floor, or in a plant where housekeeping is audited, it stops being an option. Under proper conditions a mechanical seal also outlasts a packed box and needs no adjustment at all, which removes the routine of tending a gland. The trade off is that a mechanical seal will not tolerate dry running for even a few seconds, so the pump needs its suction flooded before it is started and must never be left to run against an empty line.
Key Features
- Genuine Roper Pump Company 3600 Series gear pump, model 3711HBFRV
- Lapped face mechanical shaft seal instead of compression packing
- Flanged ports with outboard ball bearing and integral relief valve
- Up to 84.8 gallons per minute at 750 revolutions per minute, to 125 pounds per square inch
- Bi-directional, self priming cast iron helical gear design
- No gland to adjust, and no routine weep at the shaft
Applications
- Duties where product leakage is unacceptable
- Fuel, solvent and petrochemical transfer
- Mixing, blending and recirculating service
- Plant installations subject to housekeeping or emissions scrutiny
- Permanent piped systems where the pump runs unattended
Specifications
- Brand: Roper Pump Company
- Model: 3711HBFRV
- Series: 3600 Series heavy duty gear pump
- Theoretical Displacement: 0.11 gallons per revolution
- Maximum Speed: 750 revolutions per minute
- Maximum Flow: 84.8 gallons per minute at maximum speed
- Maximum Differential Pressure: 125 pounds per square inch
- Port Connection: 2 inch flanged
- Shaft Seal: Lapped face mechanical seal, Roper standard elastomeric bellows type
- Temperature: Standard build to 212 degrees Fahrenheit, buildable to 450 degrees Fahrenheit
- Relief Valve: Integral
- Shipping: Moves by truck freight
- Condition: New
Frequently Asked Questions
Q: How do I tell a sealed pump from a packed one at a glance?
Read the second digit of the figure number on the pump plate. A 6 is the packed box and a 7 is the mechanical seal, which also tells you which spare parts to carry.
Q: What kills a mechanical seal fastest?
Dry running, followed by cavitation and coupling misalignment. All three interrupt the liquid film the faces rely on, and the damage is done in seconds rather than months.
Q: Should I keep a spare seal on the shelf?
On a pump running unattended it is worth it. A seal is a small item next to the downtime, and it is the part most likely to need attention first.
Q: Can the elastomer be changed for a hotter or more aggressive product?
Yes. Roper offers the same seal in Buna and Viton, and a PTFE wedge version, so the elastomer can be matched to the fluid and temperature.
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 mechanically sealed pump model before you order.
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