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Success Stories


HELICOIL® thread inserts simplify the maintenance of KSB pumps in power plants and reduce their risk of outages.

Pylon in the sunlight

For greater planning reliability

A small detail that makes a big difference. The high-strength, thermally resistant HELICOIL® thread inserts ensure that KSB pumps can be easily removed even under extreme conditions, making inspections in safety-critical areas of power stations much easier.

Initial situation

Inspection difficulties

KSB pumps are used in many industries to safely transport and insulate liquids (which may be aggressive, explosive or toxic). Power station operators in particular rely on KSB’s extensive range of high-performance pumps. These are used for boiler recirculation or to transport boiler feed water, condenser water, cooling water or coolant.

The demands placed on the pumps in a power station are high: nothing less than absolute reliability is required. They need to be easy to inspect throughout their service life. Furthermore, removal of the large service gate screws must be possible at any time.

Our job was to minimise the risk of the screw connection becoming difficult to remove due to operating influences. Unplanned time spent on inspection ­– at worst even causing delays in recommissioning the power station – is a thing of the past.

KSB primary coolant pumps
KSB primary coolant pump


HELICOIL® thread inserts

No time wasted. To remove pumps for maintenance in future without disruption, we recommended the reliable HELICOIL®  thread technology to KSB. With this solution, a purpose-built installation tool is used to screw a size M 125 x 4 x 166 HELICOIL® thread insert into the pump housing to reinforce the thread. This prevents seizing. The pump can now be easily removed and mounted again. Each approx. 30-tonne pump housing contains 16 threads with HELICOIL® thread inserts.

HELICOIL® Plus thread insert free running design
HELICOIL® Plus Free Running thread insert
HELICOIL® Plus Free Running Thread insert for metals


More effective maintenance

Using HELICOIL® thread technology ensures a more uniform load distribution in the thread and makes the pump easier to service. Costs arising from maintenance delays can be effectively avoided – this is a technical improvement that pays for itself.

Joint effort: Employees at KSB and Böllhoff perform a screw test
Joint effort: Employees at KSB and Böllhoff perform a screw test

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