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Finnchain System for Rectancular Tanks

Finnchain System for Rectancular Tanks. International product development. Finnchain System for Rectancular Tanks. Finnchain System: Bottom and surface collector. TYPE A: Bottom & surface collector. TYPE F: Cross collector. Finnchain System: Bottom sludge scraper system.

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Finnchain System for Rectancular Tanks

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  1. Finnchain System for Rectancular Tanks

  2. International product development

  3. Finnchain System for Rectancular Tanks

  4. Finnchain System: Bottom and surface collector TYPE A: Bottom & surface collector TYPE F: Cross collector

  5. Finnchain System: Bottom sludge scraper system TYPE B: Bottom collector TYPE C:Bottom collector for LAMELLA tanks

  6. Finnchain System: Surface skimmers TYPE D: Surface scum skimmer TYPE D1:Oil skimmer

  7. Finnchain System: Grit scrapers TYPE E: Grit scraper with FLIGHTS TYPE E1:Grit scraper with BUCKETS

  8. Patented drive wheel with pulling pin construction • The only wearing part of drive wheel is the pulling pin which is easy and fast to replace

  9. Long lifetime and operational reliability

  10. Otsikko? Sprocket wheel with teeth driven chain Drive wheel with adjustable pitch for Notched-link chain

  11. Otsikko? Sprocket wheel with teeth driven chain Drive wheel with adjustable pitch for Notched-link chain PIN wears the bushing from inside DRIVE SPROCKET wears bushing from the outside IDLER WHEEL wears bushing from outside DRIVE WHEEL’S PULLING PIN wears the chain notch PIN wears bushing from the inside IDLER WHEEL wears the minimum of the chain’s bottom surface • Bushing wears quickly • Breaking strength of the chain in proportion to wear rate • Longer lifetime for bushing • High breaking strength of the chain maintains longer

  12. Bearing area comparison data sheet Sprocket wheel with teeth driven chain Drive wheel with adjustable pitch for Notched-link chain PIN CHAIN (DIN 8150) NCS 720S

  13. Chain type Chain Pitch Joint Bearing area Notch Bearing area Allowed working load calculated according to bearing area mm mm2 mm2 kg Finnchain HA200M 198 1170 1300 1080 Finnchain HA205M 206 1320 1640 1180 NCS 720S 152 1104 972 875 Pin Chain (DIN 8150) 160 600 988 540 Bearing area comparison data sheet

  14. Reliability and operational dependability

  15. Notched-link chains for rectancular tanks HA205M HA200M HA44M • Chain for small to medium tanks • Chain for medium to large tanks • Drive chain • Chain for small tanks with limited operation space

  16. Drive wheel with adjustable pitch • The mutual distance of pins increases by relocating them by the same number of slots towards A • Perfect match between chain and wheel within operational lifetime • Always several (4-5) pins pulling the chain • Minimizing the wear of the chain

  17. Comparison of working load with NEW chains: Sprocket wheel with teeth driven chain Drive wheel with adjustable pitch for Notched-link chain • The workign load is divided between several pulling teeth/pins and chain links

  18. Comparison of working load with USED chains: Sprocket wheel with teeth driven chain Drive wheel with adjustable pitch for Notched-link chain • Entire work load pulled by one tooth mainly • Other teeth have lost the pullign contact with the chain • The pitch of the pulling pins have been adjusted perfectly to match with worn and elongated chain • The workign load is divided between several pullign pins and cahin links

  19. Lifetime comparison Wear • Finnchain HA-chains with variable pitch drive wheel • Traditional chains with sprocket wheel

  20. Scraper flights rectangular tanks FC-200 FC-190 FC-220 • For tanks width 1.5-6,5 m • Height 190mm • For tanks width 6,5-8,5m • Height 200mm • For tanks width 8-10m • Height 220mm

  21. Scraper flights rectangular tanks FC-310 FC-300 • For tanks width up to 9m • Height 300mm • For tanks width up to 12m • Height 310mm

  22. Flight Types Dimensions mm Thickness mm Weight Kg/m Cross Sect. Area mm2 Moment of Inertia mm4 Polar Moment of Inertia mm4 X - X Y - Y X – X Y – Y LV FC-190 190 x 71 x 2.5 2 x 2.5 2 x 2.5 2 1098 3337865 611259 479313 FC-200 200 x 100 x 2,5 2 x 2.5 2 x 2.5 2.6 1344 5724000 1152500 2520000 FC-220 220 x 120 x 3 3 x 3 2 x 3 4 2315 10891285 5101358 7012345 FC-300 300 x 100 x 2,5 2 x 2.5 2 x 2.5 3.2 1702 11183000 1664100 2521000 FC-310 310 x 120 x 3 3 x 3 2 x 3 5.6 2823 19917118 5600130 7013038 Scraper flight data sheet

  23. Attachment of scraper flight Competing system Finnchain system • Flight attached to the attachment link • High pulling line ->vibration • The wider tank, the higher flight makes the problem worser • Flight attached to the patented flight end connector • Pulling line in the middle of the flight

  24. Torsion test for scraper flight Traditional system Finnchain system • Flight type NLC-145 • Open sigma profile • Torsion • Flight type FC-190 • Closed hollow profile • No torsion

  25. Problem: Chain skippingSolution: Chain watch • If the system meets rapid and heavy increase of the workload that jamms the movement of the system, normally the plastic chain lifts off from the pulling pin or sprocket’s teeth • Without any safety devices the chain skipping could cause damages such as: • The flights do get misaligned and will drop off from the return rails • The chain can broke • Flights and flight end connectors can broke • Afterwards the system is a long time non-usable because of extensive and expensive repair

  26. Problem: Chain skippingSolution: Chain watch • The chain watch is installed above sprocket and it mechanically prevents chain skipping • The movement of the lever on top of the chain activates the inductive switch at desired over load and stops the motor immediately, also alarm signal can be activated • The chain watch stops the system before any damage can happend

  27. Idler wheel • Teethless, does not wear the chain • Installation with retaining rings, easy to install and replace • FC-1P/76 with 76,1 mm hub bore for small to medium tanks • FC-1P/80 with 80mm hub bore from big tanks

  28. Idler wheel shaft • Can be installed/positioned close to the end wall turning • Sludge can be collected away from the corners • Axial adjustment to ease installation

  29. Drive shaft • Drive shaft is made of AISI 304 or AISI 316 stainless steel • Shaft diameter 80 mm

  30. Drive shaft Bearing • Self aligning bearing • Self adjusting • Water lubricated • Long lifetime because of wide bearing area

  31. Bottom rail • Bottom rail FC-122, ease to install and replace • Two types: smooth and with guiding track • Connected to eachother with attachment piece • Attachment piece is well anchored to tank floor • Thermal expansion is allowed

  32. Drive unit • SEW-Eurodrive 0,18-0,55 kW, power depends on tank dimensions • Integrated motor and gear box – one package • Standard speed of system is 1,2 m/min • Customized speed with inverter or specified gear box

  33. Electrical wiring diagram • Standard motor 3-phase, supply 380-415V 50Hz • Inductive switch of the chain watch, supply 24V DC – left and right sides • Options available by request

  34. High quality patented solutions

  35. References • Psyttalia WWTP, Athens Greece • 128 sludge scareper systemsin operation since 2002-2004

  36. References • Project Besos, Barcelona Spain • 90 sludge scraper systemsin operation since 2005-2006

  37. References case: Hämeenlinna WWTP, Finland

  38. References case: Hämeenlinna WWTP, Finland • Rectangular tank: length 35m and width 7m for primary sedimentation • First system installed 1984 following systems -85, -89 and -90, together 16 systems • Sludge scraper system has been in continuous operation since 1984 until 2004 when system was modernized: chain, drive wheel, flights and chain watch • Tank has been emptied and cleaned every 3 year for maintenance purposes • During 1984 – 2004 following spare parts has been replaced only once: • Wear pads of flights • Idler wheels • Roller drive chain 20B-1

  39. References case: Hämeenlinna WWTP, Finland • 1700 installations worldwide in June 2007, for example: • Australia, Austria, Czech Republic, China, Curacao, Denmark, Estonia, Finland, Germany, Greece, Hong Kong, Hungary, Indonesia, Iran, Israel, Italy, Japan, Latvia, Lithuania, Malaysia, Netherlands, New Zealand, Norway, Oman, Philippines, Poland, Portugal, Russia, Saudi-Arabia, Slovenian, Spain, Sudan, Sweden, Switzerland, Taiwan, Thailand, United Kingdom, Vietnam… • Longest tanks 98 m, width 10,5 m • Widest tanks 12,6m, length 30 m • Examples of big deliveries: • Malaysia Puchong (w-l) 4,9m – 49m, 32 tanks for primary sedimentation, type-A • Malaysia Bunus (w-l) 4,9m – 23m , 32 tanks for primary sedimentation, type-A • Russia Yekaterinburg (w-l) 12m – 63m, 8 tanks for secondary sedimentation, type-A • Vietnam Ho Chi Minh (w-l) 5m – 26m, 20 tanks for secondary sedimentation, type-A • Vietnam Ho Chi Minh (w-l) 5m – 13m, 20 tanks for primary sedimentation, type-A

  40. Thank you

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