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Single seal platform satisfies wet and dry running applications

15 October 2009

John Crane has introduced a seal that meets the design requirements for wet-running and dry-running service capabilities with one common platform. The new Type 3740 cartridge split seal is the latest and most advanced product to join John Crane’s existing split seal portfolio. It is available in two variants: Type 3740 for wet-running and Type 3740D for dry-running services.
The Type 3740 wet-running seals allow fast and easy installation while providing reliable performance in demanding pump and other rotating equipment fluid services. The Type 3740D dry-running split seal is designed for the large shaft run-out and harsh operating conditions commonly associated with top-entry vessel mixing services and other dry-running applications. Typical wet-running equipment applications include pumps and side-entry agitators, while the dry-running version is for top-entry mixers and other dry environment sealing services that frequently have large levels of shaft run-out.
The new seal family features a minimum number of factory pre-assembled components. This makes installation fast and easy, even by those with minimal split seal training and installation skills and also ensures a long and reliable service life. The Type 3740’s robust performance capabilities also allow more difficult services to be sealed with a split seal than ever before. The Type 3740 wet-running seal can successfully operate in applications  up to 450 psig and withstand shaft run-outs of up to 0.060-inches TIR, while the Type 3740D dry-running version can accommodate pressures from vacuum conditions up to 80 psig and shaft run-outs of up to 0.150-inches TIR.
The Type 3740 product line incorporate the latest John Crane split seal features, technology and capabilities which give it a wide appeal for process industry applications.

Features include:
Factory-preassembled rotor assembly for fast, easy and precise rotating face installation
Separate stationary seal face for easy visual alignment of the halves 
Factory-preassembled gland plate unit for easy, single-step installation
Balanced primary ring design for increased pressure capability
Captive socket head cap screws eliminate lost or dropped screws
Same-side screws on all hardware for easy access and faster installation
Dovetail grooves contain all O-rings without requiring adhesives
Fast and easy field repair kits that do not require special tools, adhesives or procedures
Large shaft run-out capabilities for both wet-running and dry-running versions
High pressure ratings for wider range of split seal applications

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