Author Archives: zollt

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As we are ending another mild winter, store ventilation and control may well have proved problematic.  It is also worth a reminder that the new CIPC regulations come into effect in July this year and there is still time to contact Bennett & Co for advice about ventilation and upgrades for existing stores.


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For any new storage projects, Bennett & Co suggest that you visit the new project planning pages on their website which lists a range of things which need to be considered.  For example, if the proposed site is likely to be on fenland, which traditionally has a low soil bearing capacity, Mike, working with experienced structural engineers, can provide solutions for all your land needs such as piling, drainage, watercourses and ponds.  Working with specialist groundwork subcontractors allows the foundations and bases to be well prepared prior to erection of the storage facilities.

Mike is also experienced in submitting complex planning applications and liaising with the relevant planning authority.  This may well include environmental considerations, such as surveys to minimise impact on wildlife and landscaping the site as well as noise surveys and any potential effect on the local area.

For all your storage needs both new and existing, Bennett and Co can offer a complete turnkey solution.

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The summer of 2010 saw the commencement of work on a new 4500tonne store for Waldersey Farms Ltd.  Their brief was to build a store accommodating three storage areas – one for drying and storage of onions, one for grain drying and one for dry grain storage.  This would provide improved storage capacity and, in a part of their landholding without adequate crop storage, would allow both onion and grain drying.  It was to be sited in an existing farmyard and included demolishing existing buildings and recycling the material, as well as backfilling the existing tanks and pits of the former pig unit.  Despite its remote location, particular care needed to be taken with regard to noise levels, as well as a concern about bats in the buildings to be demolished.

Bennett & Co were appointed as Principal Designer and Principal Contractor, with the remit to design, implement and manage the entire project.  Being fenland, the stability of the ground was an issue and working closely over the design with consulting engineers, Plandescil Ltd, 198 piles were constructed by the specialist contractor Keller using VCC type piles (Vibro Concrete Columns).  The extensive reinforced concrete slab required was completed by D G Scales Ltd prior to erection of the steel-frame building by A C Bacon Ltd.  A hardwood timber floor was fitted in all storage areas by Challow Ltd.

Harvest Installations fitted stirrers and a CHC modulating gas burner in the grain drying store, with a further CHC in the onion drying store.  Automatic louvres and a central control panel were installed by Farm Electronics Ltd and the complete store was ready for harvest 2011.

Farm buildings prior to project development from Bennett Crop Storage

Existing farmyard before upgrading the store

Cambridgeshire onion and grain store

Following completion of project

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Following Stody Estate’s initial enquiry about improving their grain storage capacity, Mike Bennett of Bennett & Co worked closely with them ensuring their brief was fulfilled.  Using a Bacon building and a Challow hardwood drying floor, the 2000tonne store was erected and a Harvest Installations Maxi stirrer system installed.  Stirring to aid bulk drying of grain is now a standard means of enabling faster and more efficient drying in on-floor stores to greater storage depths – 4m depth in this particular case.  Mike has over 25 years’ experience with Harvest stirrers and is happy to discuss the benefits and suitability for the individual client.

second-stody-picture-2016He also installed a Constant Humidity Controller, an allied Harvest Installations product, which enables continuous grain drying, 24 hours a day.  This has significant benefits and enables the grain to be dried faster without the need to depend on external conditions.

If, however, as in the case of Stody Estate, the noise levels needed particular consideration, Mike fitted acoustic inlet louvres which significantly reduce any noise impact on the surrounding area.

Bennett and Co undertake a variety of work involving potato, onion and vegetable storage, as well as drying of other products.

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In the autumn of 2014 Bennett & Co completed a 4000tonne refrigerated potato box store for Patrick Dean Ltd.  The brief was to build a store with four storage areas within the existing farmyard as part of their significant potato growing enterprise.  The design needed to incorporate storage for both ware and seed crops in separate areas, with a covered loading and unloading area.  (CIPC is not used therefore it is acceptable to have both seed and ware crop in the same building). The large roof area was also needed to provide additional PV panel capacity to augment the new large electricity supply to the site.

Working with Patrick Dean, a design was achieved to meet their requirements of fitting this large building into the existing farmyard.  Most of the designated area had previously been a pig unit but recently had been a storage area for potato boxes.  Old slurry channels and tanks needed to be dug out and refilled with backfill and then compacted to provide a firm foundation for the building and its concrete floor.

Due to unavoidable delays in getting the project underway, the floor was laid in a single day with laser screed machines and additives included in the concrete specification thereby allowing the cladders to move in and install the internal walls within 2-3 days.  The size of the building allowed the cladding, ventilation and doors to be fixed at one end of the building allowing the client to fill part of the store before the other end was completed.  This required carefully planned project management.

The refrigeration, ventilation and control equipment was supplied by Welvent, who have supplied the client such equipment over a number of years.  25kw packaged fridge units were installed in the seed stores and 90kw units in each of the ware stores.  The building was supplied by A C Bacon Engineering Ltd with ground work and concrete floor by local contractor K&S Allbones.

Bennett & Co designed the store, obtained the planning consent and project managed the construction.

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This project arose out of a client’s need to resite the farmyard away from the old buildings that have provided sites for new and alternative businesses and the need for improving returns from the expanding potato crop.  Therefore the brief was to ensure that the building would be sited to allow further expansion of the farmyard with additional buildings at a later date.  It also had to provide new workshops for the farm and a certain amount of machinery storage as well as two potato box storage areas which could be kept under different storage regimes if required, plus grading area.

The green field site presented a number of particular planning, drainage and groundwork problems which were successfully overcome by setting the building on an especially designed ring beam foundation.

rhf1The building, supplied by A C Bacon Engineering, was clad with insulated composite cladding over the roof and sides of the storage area including a dividing wall.  The stores were filled via eave height with insulated sectional slide-over doors.

Space at the rear of the store was at a premium because the building needed to be cut into a bank on the site boundary.  The choice of refrigeration units assisted greatly in this.  Two Welvent packaged refrigerated air mixing units were installed with the plant completely contained within the unit inside the building so removing the need for condenser units outside.
rhf3A new electrical supply was brought onto the site which meant that a plant room was constructed at the rear for the meter and distribution boards etc.

rhf2The Welvent units are controlled by their UAPC controller which provides precise control of the store environment utilising low tariff electricity which can be used with a printer or have the facility for remote sensing by PC.  The unit also has the ability to control the CO2 levels within the store.


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AM2This particular farmer has had three Harvest Installations Constant Humidity Controllers for a number of years.  These have operated on both indoor round bins and outdoor silos as well as a floor store used to dry grain prior to storing their main crop potatoes.  When the Maxi-stirrer was first developed it was recognised that this store lent itself to its use in speeding up the drying of relatively large batches of grain, but at the time the larger three double auger unit was not available.

The store has an underground main air duct with below floor lateral ducts.  This allows the stirrer tracks to be mounted off the building stanchions on both sides, so that the stirrer spans the whole building.  The client constructed the tracks and brackets himself.  The building is well ventilated with large vents down both sides.  This is important when drying with a stirrer at high temperatures as the exhaust air will be saturated.

Much lower quantities of air are required for stirrer drying than for conventional floor drying, consequently the inlet on the existing fan is baffled to reduce the volume of air produced.  The client’s Harvest Installations Constant Humidity Controllers are used all together to provide the heat required to raise the air temperature.  Two are operated at full output using “click-boxes” to act as dummy sensors with the third providing temperature control.


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all1A major potato producer in the Fens had a suite of specialist potato box stores, some with refrigeration.  However they had no specialist grain drying and storage facility.  They felt that silos provided a secure means of storage to provide good quality assurance.

Two 30ft. dia. Westeel silos were selected as the most economic solution.  Drying floors with Hutchinson Powersweep silo unloaders were included with drive for the sweep augers from the outside of the silos.  To provide rapid drying at depth both silos were fitted with Harvest Installations Maxi-stirrers.  This will allow batch drying to be done if additional storage silos are added at a later date.  A 15hp fan with 2 million BTU/hr Harvest Installations Constant Humidity Controller provides the high temperature low airflow regime required for the high rates of drying possible with stirrers.

legge1The site is situated on peat fenland where the soil is very unstable.  An especially designed transformation duct feeds the hot air into either silo.  This is because the silos needed to be some distance apart to spread the load and allow each silo to “float” independently. A large base area of hardcore was constructed on top of the clay subsoil before the especially reinforced bases were laid.

The silo is filled with a 200mm dia auger with a nominal rated capacity of 50 tph.  This is also used for outloading in combination with the Powersweeps.  This provides a low cost secure drying and storage facility.

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FF1A farming company were in serious need of uprating their old Turner drier and handling equipment to feed into their large floor store.  This was compounded when the drier caught fire and burnt out.  However fitting a drier with twice the capacity into the original drier’s space presented  a number of problems.  The selection of a 4m wide Svegma 20tph drier provided the solution in that it could be fitted into the space with the addition of extended legs to support the drier over the elevator pit.  The single exhaust fan could be taken out through the roof.

The small extension to the drier building which had held the burner for the old drier now became part control room and part dustbox for the existing Law-Denis rotary cleaner.

FF3The existing mechanical intake and elevator feeding the wet bins were retained as they were of high enough capacity.  The remaining machines were replaced by Perry of Oakley 40tph machines and comprised two belt and bucket elevators, a flow and return conveyor, a drier output conveyor and an inclined flight elevator to feed from the drier to the conveyor going out to the store.  The store conveyors were to be replaced at a later date.

The drier and handling equipment control panels are linked together and contain the starters for the eventual replacement store conveyors and possible waste conveyors for the cleaner.

The client required that the drier should remain within the building which required very careful drier selection.  Perry of Oakley are able to provide a wide range of machines which gives flexibility in designing a handling system to fit into tight spaces.

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DENNIS2This Suffolk farmer had demolished his outdated square bin store and replaced it with a large floor store.  However, he was reluctant to take up floor space with batch drying on the floor with a stirrer system which would reduce the overall capacity of the building.  Instead a silo stirrer system was chosen using the Harvest Installations Maxi-stirrer and Perry of Oakley handling equipment.

DENNIS6The 30ft. dia. Westeel silo is loaded via a 60tph mechanical intake that feeds the elevator and inclined conveyor.  The system can dry approximately 300 tonnes at a time.  Once dried the silo is emptied via a Hutchinson Powersweep silo unloader with drive for the sweep auger from the outside of the silo.  The grain is then taken up the elevator into a conveyor running down the centre of the building in the roof apex.  This in turn feeds a travelling cross conveyor that runs on rails suspended from the roof.

Harvest  Installations Maxi-stirrers provide rapid drying at depth.  The client’s own Simplex fan was used, baffled to reduce its output, with a 2 million BTU/hr Harvest Installations Constant Humidity Controller providing the high temperature low airflow regime required for the high rates of drying possible with stirrers.  These were placed in an especially designed fan house to meet the noise restrictions required close to the village.