# Preventive Maintenance

There are several criteria that affect the need for service on EP-tools such as; type of joint, torque level and tightening duration, production rate, air pressure and air quality. Recommendations are based on Reference Tightening, as listed in table. The service intervals and service solutions are based on experience and internal testing.

## Reference Tightening

Tool size | Torque level of max torque | Tightening time | Production rate tightening/hour
--- | --- | --- | ---
EP 5-6 PTI | 70-80 % | 1 second | 600
EP 7-8 PTI | 70-80 % | 1 second | 600
EP 9 PTI | 70-80 % | 1,5 seconds | 500
EP 11 PTI | 70-80 % | 1,5 seconds | 500
EP 13 PTI | 70-80 % | 1,5 seconds | 400

The air installation and air quality for the Reference Tightening should be according to recommendations in the Product Instructions. Deviations from above conditions may affect the service intervals.