| Coupling | Synthetic Rubber | Polyurethane | H-Trans | Pilot Drill Size | Max. Bore D | ØA | Length thru' Bore L1 | ØB | Gap G | ØE | DBSE | Overall Length TL1 | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Type | Size | Rated Torque (Nm) | kW @ 100 rpm | Rated Torque (Nm) | kW @ 100 rpm | Rated Torque (Nm) | kW @ 100 rpm | SW/RRS | L | ||||||||
| RRS | 99 | 46.40 | 0.49 | 69.6 | 0.73 | 116 | 1.2 | - | 30 | 78 | 65 | 27 | 51 | 2 | 27 | 100 | 72 |
The RRS 99 is a specialized "Radially Removable Spacer" (RRS) coupling, designed as a premium solution for process pump applications. It is specifically engineered to bridge the gap between shafts while providing a "drop-out" section. This allows maintenance teams to service mechanical seals or bearings without disturbing the motor or the piping, making the Size 99 one of the most popular choices in fluid handling industries.
The RRS 99 offers a significant increase in capacity over the smaller 95 size, making it suitable for medium-duty industrial motors.
| Specification | Metric Value |
| Rated Torque (Synthetic Rubber) | 46.40 Nm |
| Rated Torque (Polyurethane) | 69.6 Nm |
| Power Rating @ 100 RPM | 0.49 kW (Rubber) / 0.73 kW (PU) |
| Maximum Bore Capacity (D) | 30 mm |
| Outside Diameter (ØA) | 78 mm |
| Distance Between Shaft Ends (DBSE) | 100 mm |
| Overall Length (TL1) | 72 mm |
The RRS 99 utilizes a modular design to simplify machinery repair:
Spacer Function: The coupling uses a rigid center spacer to span a 100 mm DBSE (Distance Between Shaft Ends).
Torque Transmission: Power flows through the "Snap Wrap" elastomeric element held between the jaws. This element cushions the drive and handles misalignment.
Radial Removal: Unlike standard couplings that require sliding the motor back to access the pump, the RRS 99 center section can be unbolted and removed radially (to the side). This provides instant clearance to remove the pump’s rotating assembly.
Reduced Downtime: Eliminates the need for time-consuming motor re-alignment after pump maintenance.
Standardized 100 mm DBSE: This length is the global industry standard for most "Back Pull-Out" centrifugal pumps.
Fail-Safe Operation: The interlocking jaw design ensures that if the elastomer fails, the metal jaws will still transmit power for an emergency shutdown.
High Torque Options: When fitted with H-Trans elements (as seen in the chart), the torque rating jumps to 116 Nm, allowing for smaller footprint couplings on higher-power drives.
Maintenance-Free: Requires no lubrication or grease, which prevents contamination in sensitive process environments.
The RRS 99 is a staple in high-uptime industrial facilities:
ANSI & ISO Process Pumps: The primary choice for chemical and hydrocarbon processing.
Industrial Cooling Towers: Connecting drive shafts where space for maintenance is limited.
Paper & Pulp Mills: Used in agitators and stock pumps where frequent seal changes are required.
Wastewater Treatment: Ideal for sludge and centrifugal pumps.
The RRS 99 is the "maintenance man’s favorite" coupling. By providing a 100 mm spacer and a 30 mm bore capacity, it meets the specific requirements of modern industrial pump standards. It combines the vibration-damping benefits of a flexible jaw coupling with the immense practical advantage of a radially removable spacer.
