Turning bright ideas into perfect screens

Transcription

1 Turning bright ideas into perfect screens

2 01 General information What is wedge wire? Trislot wedge wire filter elements are made from shaped wires referred to as profiles and other shaped wires referred to as support rods. The surface profile wires are accurately spaced and welded to the support rods. The welding is done by automatic resistance welding. Why choose for wedge wire? - no risk - mechanical strength - no maintenace cost - no replacement cost = less production stops Wedge wire: less total cost of ownership Customer satisfaction questionnaire about the quality of Trislot Excellent Above average Average Below average Poor Quality of goods Customer support Quality of documentation Reliability of delivery Pricing Why choose for Trislot? - excellent service - high precision - best quality 2

3 What does Trislot make? From two basic forms, almost all shapes and sizes can be developed according to the customer s wish, namely: - slot tubes; - flat screens. The filter elements can be provided with fastenings, reinforcements... In most of these cases a drawing will be submitted to the customer for approval. After welding these accessories to the filter elements, further treatment can be provided to improve the surface quality: - degreasing and pickling (standard); - hardening mainly by tenifer treatment and hard chromising; - mechanical and electrolytical polishing. TESTIMONIAL As an Original Equipment Manufacturer (OEM) of high quality automatic backwash filter equipment, we took the decision many years ago to shift from wire mesh to Trislot wedge wire screens. The reason is obvious: take no risk protecting expensive equipment and/or products. A lead-customer (a steel plant) is using our equipment to filter its cooling water. In this process, the filter element is crucial in our equipment. It has to be very strong and very good quality. The fragile structure of wire mesh forced us to shift to wedge wire. In one occasion the wire mesh filter element broke during the working process, with big financial losses for the steel manufacturer as a result. As the hard-particles were no longer separated from the cooling water for the rollers, the rollers were damaged and the produced steel plates had recurrent print marks, hence became second choice steel plates... You can imagine the financial loss for my customer. We resolved the problem permanently by using Trislot wedge wire screens in all our equipment and applications. In addition to the strong construction, the non-clogging structure of the wedge wire screens even gives us a bigger advantage as the filtering process does not need to be interrupted for changing out clogged wire mesh filter elements. Both Korea Envi-Tech and our customers are extremely happy with this solution. Mr. Jong-Ho Park President Korea Envi-Tech, South Korea 3

4 Trislot surface profiles Figure Name Width Height Angle ( ) Cross section - Q Moment of resistance - W Bending moment - I Titanium GR II inch inch inch 2 inch 3 inch 4 DIN Ø 0.8 0, , , , Ø 1 0, , , , Ø 2 0, , , , S 0,0178 0, , , , S 0,0197 0, , , , SC 0,0237 0, , , , S 0,0296 0, , , , S 0,0296 0, , , , S 0,0394 0, , , , SL 0,0394 0,0788 0, , , S 0,0473 0, , , , S 0,0591 0, ,5 0, , , SC 0,0591 0, , , , S 0,0709 0, , , , S 0,0867 0, , , , SC 0,0867 0, , , , ST 0,0898 0, , , , S 0,1103 0, , , , S 0,1339 0, , , , S 0,1339 0, , , , SC 0,1339 0, , , , S 0,1969 0, , , , Trislot support profiles Figure Name Width Height Cross section - Q Moment of resistance - W Bending moment - I AISI 430 AISI 304 inch inch inch 2 inch 3 inch 4 DIN DIN Q 22 0,0788 0,0898 0, , , Q 25 0,0788 0,1182 0, , , Q 35 0,1182 0,1969 0, , , Q 53 0,1969 0,1182 0, , , Flexible screen D 45 0,1497 0,2205 0, , , Teardrop-shaped D 56 0,1969 0,256 0, , , Teardrop-shaped 10 x 3 0,1182 0,3938 0, , , x 5 0,1969 0,4331 0, , , x 3 0,1182 0,4725 0, , , x 3 0,1182 0,5906 0, , , x 3 0,1182 0,9843 0, , , x 3 0,1182 1,9686 0, , , The open area, Fo, is expressed in % and can be calculated using this formula: s s = slot width (inch) Fo = x 100 (%) b + s b = width of surface profile Example: Surface profile 22S : b = 0.07" and Slot width : s = " " Fo = x 100 % = 21.42%

5 AISI AISI AISI AISI AISI Uranus Monel Uranus 45N Uranus 52N UNS L 317LN B6 400 (1) Hastelloy C276 (2) Duplex Super Duplex S32750 DIN DIN DIN DIN DIN DIN DIN DIN DIN DIN DIN (Norsok) Diamond-shaped for support purpose AISI 316 Ti; with wear-head AISI 316 Ti and 1008 Si; with wear-head with wearhead 254 SMO (3) DIN AISI AISI AISI AISI Uranus Monel Uranus 45N Uranus 52N UNS L 316Ti 317LN B6 400 (1) Hastelloy C276 (2) Duplex Super Duplex S32750 DIN DIN DIN DIN DIN DIN DIN DIN DIN DIN (Norsok) 254 SMO (3) DIN (1) Registered trademark of Inco Alloys. (2) Registered trademark of Haynes International. (3) Registered trademark of Avesta Sheffield AB. Standard available on stock Available for projects 5

6 02 Trislot slot tubes What are slot tubes? Trislot slot tubes are composed of a surface profile that is spirally wrapped around axial support profiles and attached to eachother by resistance welding. These filter elements have the unique advantages of very accurate, narrow slot openings and perfect roundness all in one. Slot tubes can be provided with the necessary endpieces for attachments and/or reinforcements. Filter cycles Slot tube Filtering Filter cycle During the filter cycle, the solids are deposited on the smooth surface. This cake acts as an extra filter for finer particles. The fines that slip through do not get stuck in the conical slots. Backwashing Backwash cycle By reversing the flow, the cake and dirt are removed from the filter surface. 6

7 Standard constructions (1) Profile Support wires Min. Ø (2) Min. slot width (3) in inch in inch 4S Q22 or Q25 0,7875 0,0006 5S Q22 or Q25 0,7875 0,0006 6SC Q22 0,7875 0, S Q25 0,7875 0, S Q20 or Q25 0,8268 0, S Q25 0,8268 0,0006 Q35 1,1812 0,002 18S 22S or Q35 1,1812 0,002 Q25 0,9843 0,0012 D45 11,8111 0, x3 11,8111 0, S 22S or Q35 1,7717 0,002 D45 or 10x3 or 25x3 11,8111 0, S Q35 8,4646 0,0079 D45 or 10x3 or 25x3 11,8111 0, S Q35 11,8111 0,0079 D45 11,8111 0, x3 or 25x3 11,8111 0, S Q35 or D45 11,8111 0, x3 or 25x3 11,8111 0,0079 O.D. in inch Number of support profiles 1, , , , , , , , , , , , , , , , , (1) Special constructions are possible on request. (2) Each diameter requires new welding equipment. Therefore the standard diameters shown in the next table, are preferred. (3) The minimum slot will increase when the diameter becomes bigger. Other diameters than these standards are available on request. (4) depending on the slot tube diameter. TESTIMONIAL TESTIMONIAL We have been trading partners with Trislot for many years now, and we hope our partnership can last for many years more. The service and quality we demand would be absolutely unattainable elsewhere. Trislot always provides us with the best answer, even when faced with those unplanned moments. Allen Moss Russell Finex Ltd, UK Trislot has offered valuable design input, high quality products, and on-time deliveries for PSL for many years. Trislot s flexible approach to design, excellent technical knowledge and customer focus has forged a valuable partnership between Trislot and PSL in the pharmaceutical marketplace. PSL Powder Systems Limited, UK 7

8 Special features Inverted profiles Inverted profile, for filtration in to out with support profiles at the inside, is possible for most profile combinations. Variable slotopening is possible for slot tubes with outside diameter up to Continuous cylinders By using a lot of support profiles, an axial slot can be obtained. These filter elements are called continuous cylinders. The minimum slot width is Reinforced slot tubes Reinforcing the slot tubes is possible through: - more or stronger support profiles; - reinforcement spiral; - reinforcement cross; - perforated reinforcement tube, used as distributor of the fluid over the slot tube. Inverted profile Continuous cylinder Reinforcement spiral Reinforcement cross Perforated reinforcement tube 8

9 Inverted profile 9

10 Finishing touch of the end surfaces Standard - grinding end surfaces - remove the loose profile ends - degreasing and pickling Welding ring and closure plate Resistance welded closure plate Optional - fasten loose profile ends - remove the burrs of the profile ends - post machining for tighter tolerances Endpieces Standard endpieces are always welded onto the support profiles. Endring Threaded fitting Flange Welding ring and threaded fitting Support elements If the slot tubes are used as a carrier for another filtermedium for example textile, round wire can be applied. These support elements can be welded with 1, 2 or 3 wires next to each other. Technical information - diameter: ± 1" to 1.57" - standard profiles: spiral wire: ø 0.003" support wire: ø 0.08" Support element 10

11 03 Trislot welded screens What are welded screens? Trislot welded screens are directly produced as flat screens. This avoids the chance of stress corrosion and the weakening of the welds, which does occur with opening and flattening slot tubes (this is the normal way to manufacture flat screens). For special applications, welded screens can be made out of slot tube. The Trislot welded screens are available in very light constructions (11S/Q25) as well as more robust forms (50S/50x3) and can be provided with the necessary frame and/or reinforcements. Standard constructions (1) Profile Support wires Min. slot Standard pitch (P) in inch in inch (2) 11S Q / S Q25/Q / x / S Q / Q35/10x3/25x / S Q / Q35/10x3 till 50x / S Q35/10x3 till 50x /0.9843/ S Q35/10x3 till 50x /0.9843/ S Q35/10x3 till 50x /0.9843/ S 10x3 till 50x (1) Special executions are possible on request (2) In most cases, all pitches are possible Maximum dimensions Max. surface profile length Max. support profile length Pitch /Profile Q25 35,44 78,75 Pitch / Profile Q35 106,3 118,12 Pitch ,96 64,97 Pitch ,12 135,83 (3) Depending on pitch 11

12 Special constructions Different support profiles A combination of different support profiles and pitches within one flat screen is possible. Special requests Frames and reinforcements can be designed and calculated on request, provided that we know the temperature, supports and differential pressure ( P). Conical baskets and cylinders Cylinders and conical baskets (conical shape) are manufactured out of one or more flat screens that are rolled and welded. Slot tubes can be used as well for this purpose after opening and flattening the elements. Conical basket 12

13 Cylinders The standard construction is as follows : slot direction is axial and the filtration direction is from the inside towards the outside. Smooth surface is at the inside and support profiles are at the outside. Technical information - minimum cylinder diameter = 1" depending on the profile combination and construction; - maximum diameter = unlimited; - slotopening: see flat screens, slot tubes. Reverse rolled slot tubes When a scraper blade is used, it is required that the supports are at the outside and the slots are radial. This is called a reverse rolled slot tube. Technical information - minimum cylinder diameter = 4" depending on profile, length and material; - maximum diameter = unlimited; - slotopening: see slot tubes. Cylinder TESTIMONIAL Recently we had a very large international project with a tight and strict schedule. Together with Trislot, we developed the supply plan to meet the project requirements. During production, we had another very good customer submit an emergency Purchase Order which also required the high quality level of Trislot filter elements. Trislot immediately reacted and together we achieved the required delivery of both projects. MAHLE Industrial Filtration sincerely appreciates our relationship and the customer service of this premium quality supplier. Darren Morgan MAHLE Industrial Filtration USA, Inc. Vice President (Operations) Reverse rolled slot tube 13

14 04 Applications Trislot welded screens can be used as flat filters or processed to make cylinders. Flat screens - static sieves for dewatering or classification: the screen is set up at a certain angle or is curved so that the surface profiles are perpendicular to the filtration direction. Through gravitation the slurry flows over the screen. - vibrating screens, dryers and coolers: screens used as support for the product that has to be treated - band filters: screen as support for paper or textile, for example for the separation of cutting oil - support screens: in this application, the screens are assembled inside vessels to support catalyst, active carbon, resin, molecular sieve... - beer bottoms Support screen Beer bottom Cylinders and baskets - drum screen with or without internal transport screw - centrifuge baskets and cylinders for the food and paper and pulp industry - starch screens - screw presses Curved screens Curve direction and filtration direction are to be determined by the customer. Heavy continuous cylinder for screw presses 14

15 Heavy continuous cylinder for screw presses 15

16 Some examples of applications - sieve bends - starch screens - candle filters - nozzles - resin traps - rotary screen - distributor and collector laterals Sieve bend Detail of filter candle Candle filter 16

17 Nozzle Resin trap Rotary screen Distributor and collector laterals 17

18 05 Trislot in the world USA ES BE FR IT CH CZ PL ZA 18

19 IL AE IN CN HK TW KR TH For contact details: 19

20 Head office - Production site Trislot nv Roterijstraat 134 B-8790 Waregem Belgium T F info@trislot.be 22/03/2017