SLIP RING FOR FILTERED WATER

Scenario

The choice of materials, even before the profile to be used, is a fundamental component in the definition of a seal. In addition to designing and manufacturing sealing systems, ATP also produces certain types of PTFE-based compounds in-house. This allows us to characterise our materials and to have the data to be able to study the behaviour of the seal proposed at a later date.

Challenge

A major global player, manufacturer of slip rings approached us for a high-performance solution to be applied on a joint installed in a water filtration plant.

The customer required excellent wear resistance as the plant was subjected to 24-hour work cycles at average high speeds, pressures and temperatures, and that the seals be M.O.C.A. certified.

The goal was to check the durability in order to define a planned maintenance schedule.

Solution

ATP’s technical staff first analysed the operating condition of the slip ring:

• Seal diameter: 47mm
• Groove: open
• Seal material: FDA
• Speed: 360 rpm (0.9 m/s)
• Fluid: 2 micron filtered water
• Operating pressure: 10 bar
• Operating temperature: 80°C-90°C
• Max. temperature: 90°C
• Flow rate: 1 m3/h
• Duty cycle: 24h/24h

Thanks to its experience in the sintering of PTFE-based semi-finished products, ATP, after subjecting a number of materials to tribological tests, has proposed SINTEK PK20®, an internally produced compound characterised by excellent wear resistance and low friction, excellent mechanical properties, good dimensional stability at high temperatures and excellent load resistance. Furthermore, this material can be used for sealing systems in the food industry as it is certified:

• 10/2011 CE
• FDA-CFR 21, Parts 170 to 199, ITEMS 177.1550 & 177.2415
• 2023/2006 EC
• Attrezzature con superfici a contatto con gli alimenti Protocollo GMP

Testimony

After supplying some samples, the customer subjected the seals to accelerated testing and was able to see a consistent repeatability of their durability.

See our general catalog for recommended materials depending on operating conditions.