RPW-125 Rotary Pusher Wet Seal – Single Cartridge Mechanical Seal
RPW-125 Rotary Pusher Wet Seal – Single Cartridge Mechanical Seal
Overview
The RPW-125 is a Rotary Pusher Wet (RPW) Single Cartridge seal with a Flush environmental port and an outboard restriction bush. The seal has hydraulically balanced, shrink-fitted seal faces in a metal bellows rotary.
Rotary Pusher Wet (RPW) Single Cartridge Seal has O-Ring secondary seals and is designed as standard for use on parallel rotating equipment shafts for the FLOWSERVE MkII Pump.
The cartridge seal is set screw driven for positive engagement with the equipment shaft. The seal has a number of further design features and comes factory assembled and tested.
Product Description
Technical Specifications
| Seal Shaft Sizes | 1.125″, 1.375″ |
| Inboard Seal Face Combination | Car/TC, Car/SiC, TC/TC, TC/SiC, SiC/SiC |
| Gasket | GFT, AF1 |
| Elastomers | Viton, ERP, Aflas, Kalrez |
| Shaft Speeds | Up to 20 m/s |
| Pressures | Up to 16 barg (232 psig) – shaft size specific |
| Temperatures | Up to 230°F |
WARNING: The Safe seal performance characteristics are typical characteristics for each variable in isolation. The individual upper limit values of each variable should NOT be used in multiple combinations of Speed, Pressure, and Temperature.
Typical Applications & Industry Use Cases
The RPW-125 is a multi-spring, hydraulically balanced single-cartridge seal engineered for a broad range of rotating equipment that requires reliability, compact installation, and environmental support ports. It incorporates shrink-fitted seal faces, O-ring secondary seals, and flush, quench, and drain ports to facilitate flexible integration with the support system.
Industries Served
General industrial pump applications
centrifugal pumps, gearboxes, and auxiliary rotating equipment.
Chemical and petrochemical plants
handling fluids where flush or quench support is required for moderate duty services.
Water & wastewater
booster pumps, service pumps, and processes where cartridge seals simplify maintenance.
OEM rotating equipment
- systems with parallel shaft arrangements where installation speed and minimal downtime matter.
Equipment & Use-Case Scenarios
- Single-shaft rotating equipment with shaft sizes around 20 mm to 100 mm (≈1″ to 4″), where a compact cartridge solution is desirable.
- Pumps requiring flush/quench/drain support where ports are required for face cooling, removal of contamination, or environmental control.
- Retrofit applications where replacing existing seals with cartridge-style seals improves maintenance turnaround and simplifies seal change-out.
- Services with moderate speed (up to ~20 m/s surface speed), pressures up to ~16 bar, and temperatures up to ~230°F or higher, depending on configuration.
Why It Fits These Applications
- Hydraulically balanced face design reduces face loading, improving wear life and stability under variable conditions.
- Multi-spring assembly ensures even compression across the seal faces, enhancing operational reliability.
- Integrated flush/quench/drain ports allow adaptation to different piping plans and support fluid control scenarios.
- Cartridge-style design enables faster installation and reduced maintenance downtime, particularly beneficial for plant environments where uptime is critical.
Installation Guidelines
Confirm the pump shaft, seal chamber bore, and gland face are clean, true, and within specification. Remove scoring, corrosion, and debris, and ensure alignment before installation.
Slide the cartridge seal into place without forcing it; align the set-screw drive with the shaft, and secure the gland/clamp per the manufacturer’s specification.
Connect the flush, quench, and drain ports as required by your support-system plan. Ensure piping is clean, leak-free, and well supported before commissioning.
Before startup, verify that the operating parameters (shaft speed, pressure, temperature, and fluid characteristics) match the RPW-125’s ratings, and that a baseline measurement (face temperature, flush flow, and drain condition) is recorded.
After installation and commissioning, monitor initial operation and verify that seal faces are operating as expected.
Maintenance & Inspection Best Practices
- Monitor flush/quench and drain performance: flow, pressure differential, cleanliness, and temperature should all be within expected limits. Deviations may indicate seal face wear, contamination, or piping restrictions.
- During planned shutdowns, remove the cartridge if feasible to inspect seal faces, springs, O-rings/gaskets, and evaluate for signs of wear or damage.
- Maintain a detailed operational log that captures shaft speed variations, changes in fluid chemistry, flush/quench performance, contamination levels, start/stop cycles, and any abnormal events (vibrations, temperature excursions).
- Replace secondary seals (O-rings, gaskets) and refresh flush/quench system components on a preventive schedule. Maintaining cleanliness in the support fluid and loop improves seal life.
- If service conditions change — higher speed, increased pressure, more aggressive media, higher temperature — review the suitability of the RPW-125 and consider whether an upgrade to a higher-duty model or an alternate material configuration is required.
Service & Support Options
- Pre-installation consultation to support the correct specification of face materials (e.g., Carbon/TC, Carbon/SiC, TC/TC), elastomer options (Viton, Aflas, Kalrez), and flush/quench piping plan compatibility.
- Field or remote commissioning support to validate flush/quench flow, measure seal face temperature under load, and confirm correct installation configuration and performance.
- Spare parts kits specific to the RPW-125 cartridge, including seal faces, O-rings, gaskets, springs, set-screw drives, and cartridge hardware for quick maintenance turnaround.
- Upgrade paths available: as service severity increases, options include migrating to higher-duty materials, alternate face combinations, or an enhanced support system configuration.
- Preventive-maintenance programmes designed to track performance trends, schedule maintenance based on actual operating history, reduce unplanned downtime, and optimise total cost of ownership.
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Contact HydroMax Seal
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E-Mail: sales@hydromaxseal.com
Address: 18511 Beaumont Hwy Building D
Houston, TX
77049
