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GTMA member Helander, a Calder

Group Company, manufactures

mission-critical components, kits

and assemblies for the Nuclear and

Oil & Gas sectors.

In Nuclear operations, it has built a

successful track record over 15 years

and supplies products in compliance

with stringent Nuclear safety class 1

requirements. The scope of work

undertaken covers a wide range of decommissioning and life-extension

projects, and the company is also part of

the Fit-for-Nuclear (F4H) programme in

readiness to support the UK nuclear


new build programme. In the Oil & Gas

arena, Helander has over 35 years of

expertise in the directional drilling sector,

and has particular skills in making critical

and complicated parts from very difficult


The company, with some 100 talented

engineering staff at its modern facilities in

Tewkesbury, has comprehensive (30

machines) in-house CNC manufacturing

facilities for parts ranging from 3mm to

3m in size. It also acts as an Integrator

by managing an approved supply chain

for added value processes thereby providing a full turnkey


GTMA member Ringspann is a solutions

provider for industrial and renewable

energy systems and among other projects has been the design of a cost

effective technical solution for a high

voltage switch application where there

had been significant problems. Ringspann designed the solution for a world

leading manufacturer of High Voltage

power supplies.

The project involved the way contacts in a

high voltage switch system must be opened

in a few milliseconds to switch off an electric

current. If it takes longer an electric arc is

produced which burns out the contacts and

this leads to costly downtime for the

provider - and misery for the consumer.

The high force needed for such a short

switching time is provided by an accumulator

spring which is pre-loaded and activates

when a detent latch holding the contacts in

place is opened.

Previously a reduction gearbox connected

to an electric motor was used to pre-load

the accumulator spring between switching

cycles, but this was expensive because of

initial outlay and running costs.

Ringspann's solution uses a lower power

motor with a cam and a special double

freewheel incorporating an indexing freewheel (which operates

with the cam to preload the spring) and a backstop


(to prevent the crank from running backwards

and damaging the spring).

The end result is lower running costs of the

smaller motor (the freewheels are more efficient than the reduction

gearbox therefore

the motor can be downsized) and a lower

initial outlay as the freewheel solution is

much more cost effective than a reduction gearbox.

Innovative achievements like this have

made Ringspann one of the world's

leading manufacturers of power transmission products

to international markets

with a product portfolio consisting of

freewheels, brakes, shaft-hub connections, torque

limiters and couplings.





With a turnover of around £16 million

Helander is experiencing high growth and is

also a leading supplier to the aerospace

and defence sectors. It is proud to hold the

aerospace sector SC21 Bronze award in

recognition of its high levels of customer

service in terms of quality and delivery performance, and is also ISO9001 accredited.

Going the 'extra mile' Helander welcomes

the opportunity to advise customers at an

earlier stage with assistance in 'design for

manufacture' which often leads to 'costdown' and 'performance-up' gains.


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