Gorman Rupp RGS1D69-B Internal Gear Pump

Gorman Rupp RGS1D69-B Hydraulic Internal Gear Pump

The Gorman-Rupp RGS1D69-B is a positive-displacement internal rotary gear pump engineered specifically for continuous, non-pulsating fluid conveyance in extreme operating environments. Manufactured to manage clean lubricating oils, light-to-heavy fuel oils, hydraulic fluids, additives, and high-viscosity viscous media, this pump excels in high-backpressure fluid transfer where centrifugal alternatives fall short.

Utilizing a gear-within-a-gear design with crescent flow-separation geometry, the RGS1D69-B provides smooth volumetric efficiency, ultra-low shear, and bi-directional versatility. Equipped with an integral internal relief loop mechanism and durable housing construction, it is built to withstand mechanical shock loads, shaft overhang loads, and high line vibration typical of marine engine rooms, offshore rigs, refinery manifolds, and industrial manufacturing plants.

Model Details:

• Manufacturer: The Gorman-Rupp Company
• Model Series: RGS / G-Series Rotary Internal Gear Pumps
• Full Model / Ordering Code: RGS1D69-B
• Manufacturer Part Number (MPN): RGS1D69-B

Technical Specifications

Interchangeable / Cross-Reference Equivalence:

• Direct structural/footprint interchange with standard Viking Pump® G-size / C-size internal gear units (e.g., G124A, G4124A class equivalents depending on mounting).
• Competitor functional cross-overs: Tuthill GlobalGear® series (GG015/GG030 families), Blackmer/Roper equivalent internal positive displacement gear units.

Key Features

1. High Volumetric Efficiency: Precision-machined internal gear teeth and close crescent tolerances deliver steady, non-pulsating discharge up to rated pressures across low and elevated fluid viscosities.
2. Rigid Shaft & Bearing Support: Heavy-duty integral bearing design reduces shaft deflection under high differential head pressures, ensuring prolonged packing/mechanical seal life.
3. Integral Pressure Relief Protection: Built-in adjustable overpressure relief valve protects the pump casing, mechanical drive, and downstream piping against blocked-line over-pressurization.
4. Bi-Directional Pumping Flexibility: Symmetrical housing geometry and ported crescent arrangement allow clockwise or counter-clockwise shaft rotation without cavitation, matching drive requirements.
5. Serviceable Back Pull-Out Architecture: Rotating assemblies and wear bushings can be inspected and replaced without severing primary suction and discharge pipe headers, slashing critical plant downtime.

Applications

• Marine Main Engine & Auxiliary Systems: Main engine lube oil priming, turbocharger pre-lube, marine diesel oil (MDO) fuel pressurization, booster transfer skids, and waste oil bilge separator feed.
• Industrial Lubrication Skids: Forced circulation for gearboxes, heavy roll bearings in steel mills, turbine bearing oil reservoirs, and centralized plant lube oil dispensing.
• Fuel Oil Handling: High-pressure burner feeding, boiler day tank transfer, heavy fuel oil (HFO) pre-heating loop injection, and emergency diesel generator tank service.
• Chemical & Process Lines: Metered circulation of thermal fluids, synthetic coolants, polyols, asphalt emulsions, paraffin, and non-corrosive industrial polymers.
• Hydraulic Fluid Charging: Supercharge pumps for closed-loop hydrostatic drives, auxiliary winches, deck hydraulic machinery, and steering gear reservoir filtration.

Compatibility

• Electric Motor Standards: Adaptable to standard IEC (Frame 90L to 112M) or NEMA (Frame 143T to 184T) via flexible jaw/spacer couplings or direct C-face motor brackets.
• Hydraulic Motor Direct Drive: Splined and keyed shaft adapters allow integration with SAE-A and SAE-B flange hydraulic orbit/gear motors on mobile and marine deck equipment.
• Marine GenSet Skids: Drop-in auxiliary feed replacement for marine engines built by Caterpillar (3500 series), Cummins (QSK series), Wärtsilä, and MAN Energy Solutions.

Frequently Asked Questions

What fluids are compatible with the Gorman-Rupp RGS1D69-B gear pump?

The RGS1D69-B is built for lubricating oils, distillate and residual fuels (MDO, MGO, HFO), hydraulic mineral fluids, synthetic gear lubes, thermal transfer oils, and non-abrasive viscous fluids. It is not configured for raw seawater, strong inorganic acids, or slurries containing gritty suspended solids.

Can this pump be driven in either clockwise or counter-clockwise rotation?

Yes. Gorman-Rupp internal gear pumps are bi-directional. However, the top-mounted internal pressure relief valve assembly must be positioned so that the valve piston faces the discharge side, venting overpressure into the suction side.

How do I adjust the built-in relief valve?

The integral pressure relief valve features an external adjusting screw secured by an acorn lock nut. Loosen the lock nut and turn the adjusting screw clockwise to increase discharge pressure setting, or counter-clockwise to reduce setpoint cracking pressure.

Does this pump require an external oil lubrication system for its bearings?

No. The inner idler gear pin and internal journal bushings are self-lubricated by the process fluid. The external ball thrust bearing is sealed/packed for life, isolating it from harsh process fluids and reducing routine grease service requirements.

How do I check if my existing motor has sufficient horsepower for high-viscosity pumping?

Horsepower requirements increase substantially with fluid viscosity and line friction loss, independent of differential pressure. When pumping viscous oils (greater than 1,000 cSt), calculate both the viscous brake horsepower (BHP) and mechanical friction torque, and reduce maximum pump RPM (typically below 900 RPM) to avoid motor overload.