Technical brochure
20Pages

Turning bright ideas into perfect screens

01 General information What is wedge wire? Why choose for wedge wire? - no risk - mechanical strength - no maintenance cost - no replacement cost = less production stops 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. Wedge wire: less total cost of ownership Customer satisfaction questionnaire about the quality of Trislot ® Excellent Above average Average Below average...

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...

Trislot surface profiles ® Flexible screen Trislot support profiles ® The open area, Fo, is expressed in % and can be calculated using this formula: s = slot width (mm) s Fo = x 100 (%) b = width of surface profile b + s Example: Surface profile 22S : b = 1.8 mm and Slot width : s = 0.5 mm Fo =

Uranus 45N Uranus 52N Duplex Super Duplex DIN 1.4462 DIN 1.4507 Diamond-shaped for support purpose AISI 316 Ti; with wear-head • AISI 316 Ti and 1008 Si; with wear-head • • • with wearhead Uranus 45N Uranus 52N Duplex Super Duplex DIN 1.4462 DIN 1.4507

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. Slot tube Filter cycles 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....

Support wires Number of support profiles (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. “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...

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 914 mm. 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 0.1 mm. Inverted profile Reinforced slot tubes Reinforcing the slot tubes is possible through: - more or stronger support profiles; - reinforcement spiral; - reinforcement cross; -...

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 Threaded fitting Welding ring and threaded fitting 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. 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...

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...

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

Reverse rolled slot tubes 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. 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 = 25 mm depending on the profile combination and construction; - maximum diameter = unlimited; - slotopening: see flat screens, slot tubes. Technical information...