SPW-515 Stationary Pusher Wet Double Cartridge Mechanical Seal
SPW-515 Stationary Pusher Wet Double Cartridge Mechanical Seal
Overview
The SPW-515 by HydroMax Seal is a multi-spring, hydraulically balanced double cartridge stationary seal designed with barrier fluid quench and drain ports and secondary O-ring seals for enhanced reliability in demanding applications.
This Stationary Pusher Wet (SPW) Double (515) Cartridge Seal features shrink-fitted seal faces and is engineered for use with parallel rotating equipment shafts. The design includes multi-springs for consistent face loading and a set screw-driven cartridge configuration. The gland also integrates a flush connection for seal support systems.
The seal is factory assembled and tested to ensure performance and ease of installation.
Product Description
Key Design Features
- Stationary Seal with Self-Aligning Seal Faces: Compensates for angular misalignment between shaft and pump seal chamber face.
- Large 3/8″ NPT Ports: Standard flush, quench, and drain ports for easy integration.
- Cartridge Design: Pre-set seal faces eliminate operator error in face load adjustment.
- Multi-Spring Construction: Even distribution of face loading for optimal sealing.
- Versatile Material Options: Available in a wide range of seal face combinations to meet varied application needs.
- Factory Assembled & Tested: Ready for installation out of the box.
Technical Specifications
| Seal Shaft Sizes | 20 mm – 150 mm (1.000″ – 6.000″) |
| Inboard Seal Face Combinations | Carbon / Tungsten Carbide (Car/TC) Carbon / Silicon Carbide (Car/SiC) Tungsten Carbide / Tungsten Carbide (TC/TC) Tungsten Carbide / Silicon Carbide (TC/SiC) Silicon Carbide / Silicon Carbide (SiC/SiC) |
| Outboard Seal Face Combinations | Carbon / Tungsten Carbide (Car/TC) Carbon / Silicon Carbide (Car/SiC) |
| Gasket Material | GFT |
| Elastomer Options | Viton, ERP, Aflas, Kalrez |
| Maximum Shaft Speed | Up to 20 m/s |
| Process Fluid Pressure Rating | Up to 20 Barg |
| Barrier Fluid Pressure Rating | Up to 16 Barg (232 psig) – shaft size specific |
| Pipework Compatibility | Plan 52 and Plan 53 systems |
| Temperature Rating | Up to 356°F |
Important Notice
⚠️ Warning: The performance characteristics provided represent typical limits for each variable independently. These values should not be combined without technical verification. For assistance with your application, please contact the HydroMax Seal Technical Sales Department.
Typical Applications & Industry Use Cases
The SPW-515 is a multi-spring, hydraulically balanced double-cartridge seal, designed for reliable sealing on parallel-shaft rotating equipment. It includes quench, drain, and flush ports, making it suitable for services requiring barrier- or quench-fluid support, especially where environmental containment or face lubrication is critical.
Industries Served
Chemical and petrochemical processing
pumps handling aggressive chemicals or fluids requiring barrier fluid protection.
Water & wastewater treatment and utility services
booster pumps or general-duty pumps needing robust sealing with flush or quench provision.
Power generation, process utilities, and heavy industrial plants
centrifugal pumps and auxiliary systems where downtime must be minimized, and reliable sealing under varying load is required.
Process industries with moderate-to-high pressure and mixed duty cycles
especially where seal support systems (flush, drain or barrier loops) are employed.
Equipment & Use-Case Scenarios
- Parallel-shaft pumps with shaft diameters from approx. 20 mm to 150 mm (1.0″–6.0″), covering a wide range of industrial pumps.
- Systems requiring dual-seal barrier fluid arrangements (e.g., API seal support plans) to provide environmental containment, face lubrication, or to isolate process fluid from the atmosphere.
- Applications with fluctuating process pressures and temperatures — the balanced, multi-spring design ensures stable seal-face loading under varied operating conditions.
- Installations where ease of maintenance and quick change-out are important: the cartridge-style design simplifies installation and reduces downtime compared with component-style seals.
Why It Fits These Applications
- Being hydraulically balanced reduces face loading, improving seal face wear resistance and stability under pressure and speed variations.
- The multi-spring, stationary-pusher design maintains uniform face pressure and helps compensate for minor shaft misalignment or axial movement, enhancing reliability in real-world service conditions.
- The presence of quench, drain, and flush ports makes the SPW-515 compatible with a broad range of seal-support systems (barrier fluid, cooling, flush, etc.), giving flexibility for different process or environmental requirements.
- Cartridge design means pre-set seal faces and factory assembly, reducing human error during installation and minimizing downtime — especially valuable in industrial plants where maintenance windows are tight.
Installation Guidelines
Ensure the pump shaft, seal chamber bore, and gland face are thoroughly cleaned, aligned, and free of corrosion, scoring, or debris before installing the cartridge. Proper sealing relies on precision and surface integrity.
Insert the SPW-515 cartridge carefully; avoid forcing the unit — ensure the quench, drain, and flush ports are correctly oriented as per your seal-support system design. Tighten the gland/clamp and securely engage the set-screw drive, as per the manufacturer’s specifications.
Before startup, connect and commission the barrier/fluid support (barrier loop, flush, quench, or drain as per plan). Vent the loop to eliminate air pockets, verify flow and pressure, and check for leaks or obstructions.
Once barrier/fluid support is confirmed, bring the pump up under controlled conditions—monitor seal-face temperature, barrier-fluid parameters (flow, pressure, cleanliness), and ensure stable shaft alignment and vibration levels.
Maintenance & Inspection Best Practices
- Routinely monitor the seal-support fluid loop (barrier or flush): check flow rate, pressure drop, fluid cleanliness, and temperature. Any drop in flow or rise in temperature may indicate wear, blockage, or fluid degradation.
- At scheduled maintenance intervals (or shutdowns where feasible), remove the cartridge to inspect seal faces for wear, scoring, or pitting; check springs for fatigue; inspect secondary seals (O-rings, gaskets) for age, deformation, or damage; examine port passages (quench/drain/flush) for deposits or clogging.
- Maintain a detailed log of operating conditions: fluid type and properties, shaft speed, pressure, temperature, start-stop cycles, flush/barrier fluid quality, and maintenance events. Use this data to identify trends and pre-empt seal failure.
- Replace secondary seals and refresh barrier/flush fluid according to a preventive schedule rather than on failure. Maintain filtration, proper barrier-fluid chemistry, and cleanliness to prolong seal life.
- If process conditions change — such as higher pressure, increased temperature, more aggressive or corrosive fluids, or higher shaft speed — re-evaluate seal specification (face material, elastomers, barrier plan) to ensure SPW-515 remains the appropriate choice, or consider upgrading to a more robust seal design.
Service & Support Options
- Pre-installation specification review: confirm appropriate seal face materials and elastomers based on your process fluid, operating pressure, temperature, and shaft size. SPW-515 supports a range of combinations to suit varied services.
- On-site or remote commissioning assistance: helps with barrier/fluid loop setup (flush/quench/drain), correct port orientation, venting, initial flow monitoring, and baseline data capture for long-term performance tracking.
- Spare parts kits available for SPW-515, including seal faces, O-rings/gaskets, springs, set-screw drives, and gland hardware, facilitating quicker maintenance or replacement and minimizing downtime.
- Upgrade or re-specification support: if operating conditions intensify (higher pressure/temp, more abrasive or corrosive fluid, more demanding duty cycles), you can coordinate with your seal supplier to evaluate alternate face materials or more robust seal configurations.
- Preventive-maintenance planning: use operational logs and performance trending to schedule seal-face inspections, barrier-fluid maintenance, and parts replacement — improving reliability, reducing unplanned shutdowns, and optimizing total cost of ownership.
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Contact HydroMax Seal
Contact HydroMax Seal today for innovative solutions, expert guidance, and over a century of engineering excellence. Your journey to mechanical sealing excellence starts with HydroMax Seal!
E-Mail: sales@hydromaxseal.com
Address: 18511 Beaumont Hwy Building D
Houston, TX
77049
