LESER Type 712 Supplementary Loading System
The LESER Supplementary Loading System (SLS) is an accessory that can be installed on new safety valves or on safety valves already in operation (retrofit). It serves to improve the operating characteristics of the safety valve.
The main applications for the SLS in the pulp and paper industry are:
- The protection of the drying cylinders
- The protection of the steam boiler
The use of the SLS leads to:
- Higher process productivity by operating the protected system closer to the Maximum Allowable Working Pressure (MAWP) (up to 97%).
- Less loss of media when the safety valve opens and closes. Both the opening and closing times are shortened.
- Shorter duration of noise emission to the environment because the opening and closing times of the safety valve are shortened.
- Fully tight up to the set pressure. The safety valve also remains tight during pressure spikes which happen below the set pressure.
- Less wear on the safety valve because there is no simmering before the safety valve responds.
All this results in:
- a higher degree of plant efficiency.
- a longer lifetime of the installed safety valve.
The SLS amortizes itself in 3–6 months.
- Under normal operating conditions of the protected system, the SLS typically operates up to 97% of MAWP; instead of the 85–90% of MAWP that is typical for a conventional safety valve for steam and gas service. The safety valve remains tight until the set pressure is reached.
- Fail-safe design: If the pneumatic supply fails, the safety valve will still work as a normal spring-loaded safety valve.
- Higher operating pressure up to 97% of MAWP in comparison to conventional safety valves
- Approvals: European Pressure Equipment Directive (PED) 2014/68/EU - ISO 4126-5 - AD 2000 A2
