John Crane unveils power transmission couplings

John Crane has launched a range of H Series power transmission couplings that combine the performance of its original Metastream range with new features.

The reliability of the original Metastream products has been proven in the energy, process and transport industries for more than 30 years.

By re-engineering these couplings from basic design principles, John Crane has been able to extend the boundaries of existing technology and create the H Series products.

These lightweight couplings can satisfy requirements in demanding areas such as turbomachinery applications.

They offer reduced moment configurations, optional arrangements for larger diameter shafts and integral shaft flanges, high balance and reliability characteristics, full compliance with ISO10441 (API 671) and can be optimised to suit individual applications.

The H Series couplings include a backup gear drive that is configured to protect the membranes in the event of a failure or high overload torque.

There is an option for electrical insulation on electric motor drives or turbine generator applications.

Torque limiting devices such as shear pins and hydraulic limiters are also included, while a torque measurement capability allows critical high performance machinery to be accurately monitored.

The H Series range includes three different families of coupling.

The H-FE units feature a transmission unit that combines high torque capacity with low weight and are suitable for use on electric motor or generator drive applications where larger shaft sizes are generally in use.

The reduced moment H-RE couplings use two factory assembled hub/flexible membrane units and a detachable spacer that produce a high integrity coupling suited for most medium-speed and high-speed compressor drives.

The high integrity H-CE couplings offer the lowest possible overhung moments plus additional shrouding of the flexible elements and bolts, making them suitable for faster compressor drives.

The standard disc material is AISI 301 stainless steel, which provides a combination of high strength and resistance to corrosion.

For high temperature or corrosive applications other materials such as Inconel can be provided.

A variety of disc options are available including the HS Series six-bolt disc design that provides maximum misalignment capacity for high thermal movement applications.

Eight-bolt discs feature on the HL Series couplings that combine the high torque capacity and flexibility required for most high-speed applications.

The HT Series 10-bolt discs offer higher torque capacity that is particularly suited to motor or generator drives with high torque peaks, low weight and low misalignment requirements.

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