High-Efficiency RPW-112 Cartridge Seal for Grundfos Pumps
High-Efficiency RPW-112 Cartridge Seal for Grundfos Pumps
Overview
HydroMax Seal RPW-112 | Single Cartridge Mechanical Seal for Grundfos Pumps
The RPW-112 is a precision-engineered range of single-cartridge seals, developed specifically for Grundfos pump models with shaft sizes of 0.47″, 0.63″, and 0.87″. This Rotary Wet Pusher (RPW) seal features shrink-fitted faces, O-ring secondary seals, and is multi-spring and hydraulically balanced, ensuring optimal performance under varied operating conditions.
With no environmental ports, this is a plug-and-play solution designed for straightforward installation in Grundfos equipment. Each seal is supplied factory assembled and fully tested.
Product Description
Design Features
- Designed for direct fit with Grundfos pumps
- Multi-spring and hydraulically balanced for stable face loading
- Shrink-fitted faces and O-ring sealing
- No external flush or quench connections required
- Supplied fully assembled and tested
Technical Specifications
| Seal Shaft Sizes | 0.47″, 0.63″, 0.87″ |
| Inboard Seal Face Combination | Car/TC, Car/SiC |
| Gasket | GFT |
| Elastomers | Viton, Alfas, EPR |
| Shaft Speeds | Up to 20 m/s |
| Pressures | Up to 16 barg (232 psig) — shaft size specific |
| Temperatures | Up to 110°C (230°F) |
Seal Naming Designation
- RPW-112-GP012 – 0.47″ Shaft with Screwed Housing
- RPW-112-GP016 – 0.63″ Shaft with Screwed Housing
- RPW-112-GP022 – 0.87″ Shaft with Clamped Housing
Warning
The seal performance values listed are typical for each variable in isolation. Do not combine upper limits of speed, pressure, and temperature simultaneously. Always consult HydroMax for application-specific guidance.
Typical Applications & Industry Use Cases
The RPW-112 is a cartridge-style single-mechanical seal designed for compact, light- to medium-duty pumps — especially those made by Grundfos. It features a hydraulically balanced, multi-spring design, shrink-fitted seal faces, and O-ring secondary seals, providing reliable sealing in general-purpose fluid services.
Industries Served
Water supply, water-treatment, and wastewater pumping
domestic or industrial booster pumps, clear-water services.
General industrial fluid transfer
clean or mildly contaminated fluids where seal reliability and compact installation matter.
Light-duty chemical or solvent handling (subject to compatibility of materials and elastomers)
suitable where pressures, temperatures, and fluid aggressiveness stay within moderate limits.
OEM, maintenance, or replacement use
for pumps originally supplied by Grundfos or similar manufacturers, where compact, pre-assembled cartridge seals simplify servicing.
Equipment & Use-Case Scenarios
- Pumps with shaft diameters of 12 mm, 16 mm, or 22 mm (as per RPW-112 spec).
- Applications up to approximately 16 bar pressure, fluid temperatures up to ~230°F, and shaft surface speeds up to ~20 m/s — ideal for many clean-water, utility, or light-duty process services.
- Systems where environmental connections (flush, quench, drain) are not required — simplifying installation and maintenance, especially in pumps where gland-space, support piping, or auxiliary loops are constrained.
- Situations where fast seal replacement is valued — the cartridge design enables quick, error-free installation without disassembling much of the pump.
Why It Fits These Applications
- The hydraulically balanced, multi-spring design reduces face loading and compensates for pressure and speed variations — promoting stable sealing and longer life in typical pump duties.
- Cartridge construction means the seal comes pre-assembled and factory-set, reducing risk of installation error, simplifying maintenance, and minimizing downtime compared with component-style seals.
- Suitability for small shaft sizes (12–22 mm) matches many compact pump models and helps maintain a tight, space-efficient seal assembly, which is beneficial for small-footprint pump systems.
- The capability to operate under moderate pressure, speed, and temperature conditions makes RPW-112 a good general-purpose seal when demanding heavy-duty performance is not required — offering cost-effective sealing for routine pump services.
Installation Guidelines
Ensure shaft, pump-housing bore, and gland face are clean, smooth, properly aligned, and free of corrosion or scoring before installation — poor surface condition can drastically reduce seal life.
Insert the RPW-112 cartridge carefully — since it is factory-assembled, avoid applying undue force; use the correct orientation and alignment, then secure the set-screw drive (if applicable) per the manufacturer’s specifications.
Because RPW-112 lacks external flush/quench/drain ports, ensure the pump fluid and operating conditions (pressure, temperature, cleanliness) are within the seal’s specification before commissioning.
After installation, run a short commissioning trial — monitor for leaks, vibration, temperature rise, or other anomalies, to verify correct sealing and shaft alignment before full-scale operation.
Maintenance & Inspection Best Practices
- Periodically inspect for leaks, seal-face wear, or abnormal vibration/noise — since there is no external flush or barrier-fluid support, seal condition depends heavily on the cleanliness of the pumped fluid and proper operating conditions.
- During maintenance shutdowns, check secondary seals (O-rings, gaskets), inspect seal-face condition, and verify shaft and bore condition — replace any worn or damaged components to maintain seal integrity.
- Maintain a log of operating conditions—fluid properties, pump speed, pressure, temperature, and start-stop cycles—to help detect early signs of wear or degradation and plan preventive maintenance.
- If you observe frequent seal wear, leakage, or operational issues, consider whether fluid contamination, temperature spikes, or pressure surges are to blame; and review whether RPW-112 remains appropriate or if a more robust seal type is needed.
Service & Support Options
- Pre-installation review: confirm fluid properties (chemistry, temperature, cleanliness) and pump operating parameters (pressure, speed, shaft size) match the RPW-112 specification before use.
- Spare parts availability: stock spare seal faces, O-rings/gaskets, secondary-seal components for timely replacements and minimized downtime.
- Scheduled maintenance program: regular inspection and replacement of secondary seals, monitoring of pump operating data — to extend seal life and reduce unplanned failures.
- Upgrade pathway: for more demanding service (higher pressure, contamination, temperature, or aggressive fluids), consider moving to a heavier-duty or multi-spring-balanced design, possibly with flush or barrier-fluid support.
With proper installation and maintenance, the FDD-500BB offers high reliability, low downtime, and excellent performance in even the most challenging ANFD, drying, and filtration environments.
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E-Mail: sales@hydromaxseal.com
Address: 18511 Beaumont Hwy Building D
Houston, TX
77049
