Overview
If your facility utilises large pumps and rotating equipment and the reliability and efficiency of your plant performance are top of mind, split seals are the answer.
John Crane split seals offer ease of installation, reduction of downtime and an increase in mean time between repairs (MTBR).
Explore our split seal solutions
Type 3740
Advanced design, wet-running cartridge o-ring split seal
The Type 3740 mechanical seal family, are split seals that use the latest modular split seal technology from John Crane…
Type 3740D
Dry-running cartridge split seal
The Type 3740D dry-running split seal is a mechanical seal designed for the large shaft run-out and harsh operating conditions commonly associated with top-entry vessel mixing services…
Type 3740XL
Extra large wet running cartridge split seal
The Type 3740XL wet-running split seal is the extra large version of John Crane's successful Type 3740 split seal that incorporates proven mechanical seal design features...
Type 37FS
Heavy-duty split elastomer bellows seal for agitators, mixers and pumps
The Type 37FS fully split mechanical seal helps significantly reduce maintenance on larger, difficult-to-seal equipment...
Type 37FSB
Heavy-duty balanced split elastomer bellows seal for agitators, mixers and pumps
The Type 37FSB fully split mechanical seal helps significantly reduce maintenance on larger, difficult-to-seal equipment…
Type 73
Inflatable back-up shaft seal to accompany split seal
Our inflatable backup seal is primarily used to hold process fluids, without leakage, while repairs are made to the primary seal, packing and other equipment components...
Type 75FS
Dry-running fully split mixer seal
The Type 75FS dry- or wet-running fully split mechanical seal is designed specifically to eliminate process contamination...
IN MORE DETAIL
What is a split mechanical seal?
A split mechanical seal can be installed and replaced without having to dismantle any of the equipment.
They come in two separate pieces, unlike ordinary cartridge mechanical seals, which, when joined together, create a proper seal around the shaft.
What types of applications are split seals suitable for?
Using split mechanical seals can reduce hours of labour, downtime and additional complexity, therefore decreasing cost. Split seals can be used in these industries:
- Mining and minerals
- Power generation
- Pulp and paper processing
- Wastewater and clean water management
This is due to the large equipment in these industries requiring a large amount of time for disassembly and repair. It’s important to note that split mechanical seals have an increased amount of potential leak areas, so they are not suitable for certain industries.
John Crane Performance Plus™
John Crane Performance Plus™ is our modular service framework, supported by the largest mechanical seal service network, with over 200 manufacturing, sales and service centres globally. That means we are where you need us, when you need us – empowering people, plant and performance.
Common questions
How do split seals work?
Split seals are designed in two halves, each containing a sealing face (carbon or silicon carbide), a holder and elastomers. When bolted together around the shaft, they create a leak-proof barrier. The two halves are aligned, clamped tightly to ensure proper face contact and rotate together to prevent fluid leakage.
Do split seals work on worn or pitted shafts?
Split seals can work on worn or pitted shafts. Their design allows the seal to compensate for minor surface imperfections, helping maintain reliable sealing without requiring shaft replacement. However, excessive damage may still require repair. John Crane’s split mechanical seals are engineered to deliver strong performance even in challenging conditions.
What are the key features of a split seal?
Split mechanical seals have a two-part design, and their halves join up with precision engineering to create a mechanical seal with no disassembly. You can install split seals directly onto existing setups, saving time and resources on dismantling.
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