Mechanical Seal Style HPPD
High-Pressure Face-To-Face Dual Stationary Multi-Spring Cartridge Seal
For high-pressure process duties and zero-emission requirements
The Style HPPD seal is designed for exceptional reliability in demanding applications, such as high-pressure, highspeed, and hazardous services. This seal style addresses the challenges of sealing high-pressure process fluids in refinery, pipeline, and power generation industries where zero-emissions are required.
- Versatile across industries: ideal for oil and gas, petrochemical, and power generation.
- Adaptable to process needs: the configurable Arrangement 3 platform can be designed for use with a pressurized API Plan 54 system or a suitable API Plan 53 when equipped with our high-performance pumping ring.
- High torque, high speed: engineered for extreme torque loads and rapid surface speeds, perfect for high-energy pumps where zero emissions are required.
Typical Flush Plans: 54/53B/53C

Mechanical Seal Style HPPD
Design Features & Benefits
Common Applications
- Crude oil
- Bitumen
- Produced water
- Boiler feed water
- Amine
- Ammonia
- Seawater
- Light hydrocarbons
Specifications
Materials of Construction
Rotary Faces: | Silicon carbide, diamond coating |
Stationary Faces: | Proprietary FlexSiCG (siliconized carbon/graphite), diamond coating, carbon |
Springs: | Hastelloy C-276 |
Metal Parts: | 316 stainless steel, Alloy 255, Hastelloy C-276 |
O. Rings: | Fluoroelastomers, EPDM, TFEP, Perfluoroelastomers |
Operating Parameters
Max Temp: | 550°F (290°C) |
Max Pressure: | 2,000 psi (138 bar) |
Max Speed: | 12,000 FPM (61 m/s) |
Max Barrier Pressure: | 1,500 psi (103 bar) |
Min Barrier Pressure Above Process: | 30 psi (2 bar) |
Note: Max Temperature / pressure / speed indicate operating extremes independently and do not imply the seal will function at these extremes at the same time. Contact Flexaseal if in doubt.
Downloads
For more information on the HPPD
Quote Request
Depending on your specific needs and application, Flexaseal can help you identify the ideal products. Contact us to tell us about your needs and request a quote.
Type A | Category 2 & 3 Contacting Wet Seals – Arrangement 3
The Flexaseal Style HPPD provides superior design flexibility with highly adaptable features to meet specific application needs and comes standard with:
- High duty seal face materials
- Premier siliconized carbon/graphite, FlexSiCG, primary ring combines self-lubricating capabilities of carbon/graphite with the rigidity and wear resistance of silicon carbide.
- Reaction bonded silicon carbide mating rings improve lubricity at the interface.
- Laser-etched lubrication-enhancing features on the mating ring amplify film load support and reduce face-generated heat.
- Robust seal rings with FEA-optimized geometry nearly eliminates seal face deformation.
- Unique mating ring key-drive mechanism evenly distributes drive forces, reducing fracture potential.
- Stationary design allows for high-peripheral speeds.
- Metal-to-metal torque transfer to flexible stationary element eliminates wear-induced seal hang-up.
- Metal oxide coated dynamic O-ring surfaces prevent wear from fretting and ensures smooth long-term operation.
- Separate inboard and outboard mating rings improve safety over designs with a common mating ring by isolating inboard and outboard seals.
- Expansive barrier fluid cavity for thermal management in high pressure applications.
Tailored Solutions with Customizable Features for Enhanced Reliability
- Radial or axial pumping ring for barrier fluid circulation without an external pump