Double Cartridge: SPS-625

Double Cartridge: SPS-625
Double Cartridge: SPS-625
Double Cartridge: SPS-625
Double Cartridge: SPS-625
Double Cartridge: SPS-625

Double Cartridge: SPS-625

The SPS-625 is a double cartridge mechanical seal with integral, bi-directional barrier fluid pumping ring and inboard wetted parts in wear resistant materials. The seal is designed for heavy duty slurry applications with process fluid containing particles as found in the Mining & Mineral, Pulp & Paper and Water & Waste sectors.

The innovative stationary seal design is offered as a complete cartridge mechanical seal solution and is designed for Plan 53, 53A, 53B and 53C system piping arrangements.

In equipment applications which have a small x-section seal chamber, the SPS-625 can be fully mounted externally (space permitting) as shown. The gland insert with integral vortex breakers creates an idealised environment with a large fluid volume over the inboard faces for optimum performance and seal longevity.

Design Features include;

  • The Sleeve End Cap and Gland Insert can be supplied in a variety of wear resistant materials to suit the arduous slurry application.
  • Fully outboard mounted so ideal for equipment with a small x-section stuffing box/seal chamber which is not conducive to seal longvity in slurry applications.
  • Large Seal port orifices - 1/2" NPT Barrier Fluid In (BI) and Barrier Fluid Out (BO) orifices for Plan 53 or 52.
  • Barrier fluid is directed to the inboard faces via an integral deflector built into the seal gland. As the barrier outlet is over the outboard faces, effective heat removal occurs at both sets of seal faces
  • Gland Insert with integral inboard vortex breakers, ideal for applications including slurry or suspended particle/solids in the process media.
  • Radial clearances between rotary and stationary components conforming to the best practice requirements of API682.
  • Monolithic seal faces for improved high temperature performance
  • Stationary seal design with self-aligning stationary seal face. Ideal for high speed applications.
  • Multi-spring design with springs out of the process fluid.
  • Highly efficient bi-direction barrier fluid pumping ring.
  • Used in conjunction with the Reliability seals Plan 53, 53A, 53B or 53C Seal Support Systems.
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Supply/Design Characteristics
Seal Shaft Sizes
System Vessel Size
12L and 28L
Inboard Seal Face Combination
TC/TC - Car / TC - Ant.Car/RB SiC - Ant.Car/TC - RB SiC / RB SiC
Outboard Seal Face Combination
Car / TC - Car / RB SiC - Ant.Car/RB SiC - Ant.Car/TC - TC/TC
Spiral Wound S/S, Graphite
Secondary Sealing
Viton, Alfas, ERP, Kalrez
Inboard Wetted Parts
316 S/S (Titanium, Alloy 20, Hastelloy C, and CD4MCU options)
Shaft Speeds
upto 4,000rpm
up to 25 Barg
Used in conjunction with a Plan 53 piping system
Pipework & Fittings
up to 250deg C

The SPS-625 is an innovative stationary seal, designed for heavy duty slurry applications with conventional thin x-section seal chambers / stuffing box bores.

The seal also incorporates best practice features, as detailed in our technical blogs and white papers.