Intermediate shell bearing
Introduced in 2008, the intermediate shell bearing located just above the perforated screen basket fully supports the auger at the non-drive end of the screen. The polyethylene bearing shell supports the auger, reduces the contact pressure between the auger brushes and the basket, reducing brush wear rates and also preventing metal to metal contact and wear between the auger and basket (if the auger brush is not replaced once it’s become worn). By not relying on the auger brush to support the auger at the non-drive end, brush life is considerably extended. The use of a shell bearing as opposed to a submerged bearing at the non-drive end of the auger shaft ensures that there is no obstruction in the flow which would be susceptible to becoming bound up with screenings.
I’m sure most manufacturers try to make such claims but it was great to have the vocal support of one of our customers who was present. At the end of our presentation Sean Smith, a maintenance manager from Wessex Water spoke up in support of our claims. He based his experience on having recently worked on the three HUBER EscaMax® screens that we installed at Calne sewage treatment works in 2007 and said that he had been impressed with the resilience of the equipment after more than 10 years of operation especially when he compared them with similar equipment on the market.
In the final part of our presentation we tried to challenge some of the accepted conventions in the water industry when it comes to after sales service. We discussed the potential benefits arising from a change in the way water companies let service contracts from one where supplier performance was measured solely on their hourly rate for labour and their response time for breakdowns to new contracts where machine availability and performance were the key measures. We shared with them some of our ideas for how HUBER could provide screening equipment with guaranteed performance levels. We outlined the capability that our electrical team has for recently developed in providing control panels with 4G telemetry so that as part of our HUBER service we can monitor and proactively maintain our equipment.
This final part of our presentation certainly generated a lot of discussion and interest in a topic which we will be pursuing with individual water companies during the rest of 2019.
by Dave Thompson
Director Engineering and Operations