Product Range SummarySilotank has the tried and proven modular settlement tankrange and the capability to produce tanks tailored to eachspecific Client process requirement.

Conical tanks can be designed for the following unit processes:

As an extension to our established settlement tank capabilitySilotank can offer its complementary GRP products such ascylindrical sumps, pipework and cylindrical storage tanks toprovide a package multi-asset solution with the full back upof its process design expertise.

Primary Settlement with no co-settlementPrimary Settlement including humus sludge co-settlementPrimary Settlement including storm holding capacityFinal Settlement for fixed film and suspended growthsecondary treatment processesStorm Holding Capacity

1)2 )3 )4 )

5 )

Standard Tank RangeA brief summary of the main features of the Standard Tankdesigns are provided below:

Hi flow Tank RangeA brief summary of the main features of the Hi Flow Tankdesigns are provided below:

Digestors, Silos & Tanks Ltd, T/A SILOTANK, Springbank Industrial Estate, Pembroke Loop Road, Dunmurry, Belfast, BT17 0QL

Tel: +44 (0)28 9062 6256 Fax: +44 (0)28 9062 6224 Web: www.silotank.com Email: sales@silotank.com

DESIGN | MANUFACTURE | INSTALLATIONCHEMICAL STORAGE / PROCESS TANKS & VESSELS, GRP COVERS, GRP LADDERS, PLATFORMS & WALKWAYS,

GRP PIPE & DUCTWORK, TURNKEY ODOUR CONTROL & CHEMICAL SCRUBBING SYSTEMS

Tank Diameter

Maximum Inlet Flowrate

Working Volume

Net Surface Area

Total Height

Depth from Inlet to Base

m

l/s

m ²

m ³

m

m

3.0

1.7

12.2

6.79

3.72

2.73

3.5

2.3

17.0

9.24

4.05

3.06

4.0

3.0

22.0

12.06

4.29

3.30

4.5

3.8

27.5

15.27

4.62

3.63

5.0

4.7

34.0

18.85

4.86

3.86

Tank Diameter

Maximum Inlet Flowrate

Working Volume

Net Surface Area

Total Height

Depth from Inlet to Base

m

l/s

m ²

m ³

m

m

3.0

2.6

18.5

6.79

4.62

3.63

3.5

3.4

25.0

9.24

4.86

3.86

4.0

4.5

32.5

12.06

5.14

4.14

4.5

5.7

41.5

15.27

5.48

4.48

5.0

7.1

51.0

18.85

5.76

4.76

CONICAL GRP SETTLEMENT TANKS

IntroductionSilotank has expanded its range of products to include conicalGRP (Glass Reinforced Plastic) settlement tank solutions foruse in the wastewater treatment industry.

The settlement tank product range draws on Silotank’sproven expertise manufacturing quality GRP products tooffer a solution for Industrial and Municipal Wastewatersettlement requirements.

Standard and Hi flow Tank RangesSilotank has developed a range of modular tank designswhich are designed to match specific Client process systemrequirements and can also provide optimum process designstailored to individual Client requirements as an alternative tothe standard designs.

The two size ranges are classed as standard and ‘Hi flow’to suit site specific tank configurations and process systemredundancy requirements.

The standard designs are sized to provide a more costeffective solution for continuous single tank operation.This set of designs can be used where multiple tanks arerequired without additional settlement capacity when a tankis out of service.

The ‘Hi flow’ units provide a predefined element of processredundancy for multiple tank installations where extrasettlement capacity is required. The process sizing of thetanks allows for the isolation of one of the tanks whilstmaintaining an effective settlement process.

Specific Tank FeaturesThe tank construction method ensuresa ‘glass smooth’ internal surface aidingsolids removal and minimising tankinternal cleaning requirements. The tanksare constructed in single piece units to therequirements of BS 4994:1987 and arefactory spark tested to guarantee theirintegrity once in service.

The 60° conical hopper slope allows evenfine solids to be transported to the base ofthe tank for removal, assisting the productionof a clarified effluent. The external structure ofthe tank is complete with reinforcing ribs whichdouble as locating lugs to eliminate postinstallation movement of the tank in itssurrounding media.

Settlement tank access and process requirementsare met by the factory fitted tank internals,connections and safety features including:

Access walkway with handrails.Peripheral handrails for fall protection.GRP Diffusion drum with scum removal handstops.Inlet and outlet U-PVC pipework with standard push fitconnectors (spec/BS for fittings).Desludge U-PVC pipework with anti-syphon vent doublingas an easily accessible rodding point.Internal GRP launder trough with inbuilt positive hydraulicgradient and adjustable peripheral v-notch weir.Optional scum removal system and U-PVCoutlet pipework.

To ensure rapid installation when the unit reaches site, eachtank is fitted with a stainless steel external base supportstructure and preset leveling points around the tank copinglevel flange. These are proven to reduce tank placingtimescales and assist with the elimination of leveling toleranceissues commonly associated with plastic settlement tankspatial positioning.

The tanks are supplied as fully constructed one pieceunits dispensing with sectional construction and jointingupon delivery to site which can prove problematic whenguaranteeing their future integrity and lengtheningconstruction timescales.

The upper cylindrical tank section can be extended fromthe minimum depth to ensure that the tank coping matchesthe site ground levels and the requirements of the mainprocess hydraulic profile.

Flexible Design CapacityDue to its design and manufacturing processes Silotank canoffer a number of refinements to the modular tank designsfor an optimum process unit sizing.

Client requirements are analysed to determine the optimumconditions for treatment, construction and installation. Thebiological and hydraulic loading rates are determined byassessment with well established industry standards toprovide a process sizing for the individual application.

The calculated process sizing information is reassessedagainst the original design requirements to identify potential

further savings prior to the production ofdetailed general arrangement drawingsfor Client agreement. The tank dimensionsare adjusted to provide the most costeffective tank geometrical arrangementto reduce capital installation costwithout compromising treatment capacity.

Full hydraulic analysis is included as anintegral stage in the design of the tank internals

to ensure that the hydraulic gradient acrossthe unit, upstream and downstream processes

are not compromised. Installations can beconfigured specifically for limited hydraulic driving

force conditions and for multiple parallel tankinstallations where treatment capacity redundancy

and tank isolation for maintenance are an integralpart of the Client design brief.