North Dean Engineering have recently supplied a 5.5M x 2.2M 3-Deck Vibrating Screen to a Leading Quarrying Operator in Derbyshire. The new screen replaces the existing Bergeard Selector Screen which endured constraint bearing trouble and deck frame failure.
Following an initial meeting where issues were addressed for better access to the bottom deck for media change including a review of the steel panel sizes on the top and middle decks. The client also required safe access on the screen basket for media changes, plus a reduced routine of manual maintenance.
To provide a new solution for the bottom deck media, which was woven wire mesh on a centre and side clamp arrangement, meaning it was very time consuming to change. North Dean Engineering’s proposal was to raise the middle deck to allow for increased access to the bottom deck and introduce polyurethane panel type media. The top and middle deck to comprise of steel media which would be half the size for easier manual handling. Plus the supply of a set of access stairs to allow direct access onto the screen, which would run over the top of the front discharge chase. Also, the addition of an auto grease lubrication system was given to reduce the routine manual greasing.
The screen was successfully installed between the Christmas and New Year period of 2016 to reduce any impact on production.
Andrew Firth, Director of North Dean Engineering commented: ‘We understood the customers’ requirements straight away. It was not just a simple like for like screen replacement. A complete overview was needed to incorporate significant improvements.’
For over 200 years, members of the Collen family have been involved in the construction industry. One of the family’s main business interests is Glebe Hill Quarry, in County Armagh. This site produces 250,000 tonnes of high PSV gritstone per annum of which 40,000 tonnes per year passes their own asphalt plant.
Collen Bros (Quarries) Ltd approached independent supplier of replacement screens, North Dean Engineering Ltd, with issues on their existing Niagara asphalt screen. The Niagara was experiencing short bearing life and a cracking side plates, of which Collen Bros had repaired themselves.
Following a visit and detailed site survey, North Dean tendered for the supply of a new 3.4M x 1.5M – 3 Full and 2 Half Deck to replace the Niagara 4tr9 Screen.
After successfully winning the tender, North Dean based their new design on the original footprint of the old screen. This meant that no modifications to the material inlets or to existing bin configurations was required. The only new supply was for a new front chute, this was due to the screens new deck configuration which allows for easier media change, as the old Niagara screen mesh changes caused a lengthy down time to the plants availability for production. The new 3.4M x 1.5M 3 Full and 2 Half Deck Vibrating Screen was supplied with a new high temperature oil bath shaft assembly. This enables the machine to cope with the high temperatures encountered in the production of asphalt.
On the completion of testing at North Dean’s works the screen was despatched to Glebe Hill Quarry in Tandragee, County Armagh for installation by North Dean’s own skilled installation team.
Mr Andrew Collen of Collen Bros (Quarries) Ltd commented: ‘North Dean undertook the total redesign of our screen, especially the deck configurations to allow for an easier change of media, to fit the footprint of our existing screen. North Dean supplied us with a quality product which was installed in just one weekend to reduce down time on the plant. The successful installation meant the plant was back up and running on Monday morning.’
Local Asphalt Liverpool, a trading name of Cemex UK Materials, initially contacted North Dean Engineering when problems arose on their existing machine. The centre shaft had issues and severe cracking to the side plates on the non-drive side had occurred.
Having had work undertaken by local engineers on the existing screen, North Dean Engineering offered a long term solution to safeguard the affected sales, due to the down time of the plant. The site at Huyton produces some 36,000 tons of saleable asphalt a year, which is mainly supplied to local markets. North Dean Engineering were chosen as the preferred supplier to design, manufacture and install a new 4M x 1.5M 2-Deck Vibrating Hot Screen. The screen was supplied complete with a pioneering precision engineered shaft assembly designed to be reliable and efficient. This is important for hot screen applications, where temperatures can reach a scorching 220oC and is particularly beneficial with recycled material.
The new screen was supplied to match the existing footprint of the old, which eliminated any costly modifications to feed, discharge and collection bunks. With the installation only taking 2 days, this again caused minimal disruption to production. Site Manager, Frank Kehoe of Cemex said; ‘we chose North Dean Engineering to supply the new screen following internal discussions within the Cemex group. It seemed that they have an increasing presence within the industry and knowing you are dealing direct with the manufacturer cuts out any middle man’.
Renishaw Works, Sheffield has recently taken delivery of a new 5m x 1.8m 3 full & 2 half deck Vibrating Hot Screen from North Dean Engineering Ltd.
5M x 1.8M 3 Full & 2 Half Deck
The site which is owned and operated by Tarmac, a CRH company, produces an average of 130kt of saleable asphalt a year which is supplied to national and local markets.
North Dean Engineering designed, manufactured and installed the new screen to replace an existing 17 year old screen. The new screen has been fitted with an innovative precision engineered shaft assembly which has been designed to give the screen more reliability and efficiency. This is particularly beneficial as the reprocessing of recycled material which leaves the dryer, can result in temperatures of up to 220º C.
Minimum disruption to site operations was achieved due to the new screen being designed to fit the existing footprint of the old screen. This resulted in no modifications being required to the existing feed & collection bunkers or front discharge chute.
Full Dust Suppression Enclosure
c/w Access Doors All Around
Also supplied by North Dean Engineering was a full dust suppression enclosure to connect to the existing extraction system which feeds the bagging plant. Supplied complete with access doors all around to allow for ease of maintenance.
Lee Mitchell – Site Manager commented, “We chose North Dean Engineering as they had helped us keep our existing screen running when we had recurring shaft assembly issues. They offered a competitive price with a bespoke solution along with their extensive asphalt screen knowledge and experience”.
North Dean Engineering is pleased to announce the appointment of Dominique Ly as CAD Technician. The new role was created as the demand for creative work has increased within this sector. Dominique offers over 20 years’ CAD experience and has specialised in steel structures and machinery throughout.
Dominique Ly – CAD Technician
Joining NDEL from across the channel, Dominique has brought his French flare to the expanding company. Kick starting his journey at the University of Metz – a highly acclaimed school of engineering, Dominique has worked in various fields including aluminium remelt to stainless steel swimming pools.
Andrew Firth, Director says ‘having a CAD Technician is one of the first steps in escalating the range of services which we provide. Dominique’s knowledge and attention to detail will be the foundation of a successful area which we are now offering to all of our existing and new clients’.
North Dean Engineering Ltd is pleased to announce its successful achievement of CE Marking Compliance with certification to BS EN 1090 Execution Class 2. Following the formal assessment and certification by the Notified Body – Centre for Assessment Ltd*.
From the 1st July 2014 it has become a legal requirement within the UK that all structural steel work being despatched from production facilities for use within civil works must be CE Marked. This CE requirement is based on the European Construction Product Regulation (CPR). Failure to comply with these requirements, which will be enforced by weights and measures authorities, can result in fines and even criminal penalties for contractors and suppliers.
The certification provides evidence of a suitable Factory Production Control (FPC), which ensures traceability of every component from source through the fabrication process and to final delivery to site. There is also a mandatory requirement for non-destructive testing of 10% of welds above 20mm thickness plate.
North Dean is already accredited to the industry recognised quality standard ISO 9001, and gaining the CE marking further enhances their capabilities and can ensure customers continue to receive the very best in engineering performance.
BS EN 1090-2 requires that for any project, the required quality of fabrication or Execution Class must be specified. This determines the level of quality required within the fabrication process, according to the type of building, height, area and purpose.
Every construction must be classified under one of the four levels where Execution Class 2 (EXC2) will be appropriate for the majority of buildings constructed in the UK. If the Execution Class is not specified on a project then EXC2 shall apply.
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*Centre for Assessment Ltd are themselves Accredited by UKAS and also registered as a Notified Body by the European Commission.
NEET are a West Yorkshire based charity, providing real work opportunities in real work settings for people with learning disabilities. The charity is dedicated to working towards a healthier and more inclusive lifestyle for people with learning disabilities, giving a supportive framework in which everyone can work to the best of their ability.
They also run a garden nursery business where plants and products are sold. North Dean’s continued support of the charity has brightened up the usually grey looking engineering yard where NEET have provided some beautiful floral displays. North Dean Director, Simeon Riach jested, ‘It now looks like summer has finally arrived’.
If you would like more information about NEET or would like to help or volunteer in any way please visit: http://www.northcliffepeopleandplants.org/index.html