Materialhandling hoses and couplings

Transcription

1 Materialhandling hoses and couplings for the processing industry

2 From light work hoses to robust sludge-handling hoses and pipelines, rubber brings many benefits to the design and maintenance of material transfer lines. The elastic rubber material absorbs the momentum of the transferred material. As a flexible surface, it reduces the strain on the hose and dampens the vibrations caused by pumps. Rubber can also recover from deformation without being damaged. When solid material particles come into contact with an obstacle, like the wall of a hose or pipeline, the angle of attack is crucial with respect to the wear factor. Practice and laboratory tests have shown that rubber works best when the angle of attack is less than 5 or more than 50. In sludge hoses, the angle of attack is almost zero, which is optimal as far as wear is concerned. From the wear-resistance point of view, a rubber surface is therefore superior than an equivalent metal pipeline. Rubber does not suffer from corrosion. In fact, process water normally lubricates the hoses, making them last even longer. Flexible rubber hosing gives the pipeline designer many choices. The hose allows for greater tolerances, and it can be bent in tight spaces without separate curved sections, facilitating pipeline dimensioning and tolerance application. For applications and places were even the most flexible hose just doesn t cut it, Teknikum can offer a wide range of connecting hoses like hose curves, reducers, T-branches and compensators. Hydraulic material transfer In the hydraulic transport of material, solids are transferred using pumped liquid pressure. Solids and carrier liquid together form a suspension, or sludge. The most commonly used carrier liquid is water. Pneumatic material transfer In the pneumatic transport of material, solid particles are transferred by air flow in a suction or pressure application. The great amount of air, high velocity and dry abrasion expose the hose to wear and cause static electricity. Material transfer by gravity In the transport of material by gravity, material moves freely in a downward inclined pipeline. Electrical charges in material transfer Uncontrolled electrostatic discharges (ESD) can cause significant damage to equipment or components and create occupational safety hazards. Among the most dangerous hazards are explosions caused by electrostatic discharges in the chemical industry. Therefore, the chemical and processing industry must pay particular attention to electrostatic discharges and the hazards thereof. Provisions for machinery and equipment used in explosive atmospheres are laid down in, for example, the ATEX directive (94/9/EC). Typical industrial processes that create static electricity include pumping and transfer of liquids through a pipeline milling, screening filtering pneumatic transport of powders reactor charging dust removal air conditioning sampling. Antistatic properties in material transfer Static electricity discharges when the strength of the electric field exceeds the dielectric strength of the medium. Electric charge accumulates when there is an imbalance between charge accumulation and charge neutralisation. The conductivity of the material plays a significant role in charge accumulation: earthing prevents the conductive material matter from storing the static electricity charge. Teknikum s ANTISTATIC material handling hoses are specially designed for the pneumatic transport of material, as they are made of antistatic elastomer materials (see the accompanying table). The specific resistance of the hoses is between 1x103 and 1x106/m, making them semiconductive. The GRANIT Select and TITAN Select coupling systems are also made of an antistatic material. Teknikum 2

3 Hoses From Teknikum s range of material handling hoses, you can find the correct hose for almost all applications. All hoses are available with light-coloured non-staining NR lining (electrically insulating) or with black highly abrasion-resistant SBR lining (electrically conductive). GRANIT Robust material handling hose with corrugated cover for highly abrasive applications. Working range C. Textile reinforcement and steel spiral. TITAN Robust material handling hose with smooth cover for demanding applications. Working range C. Textile reinforcement and steel spiral. CARBON Lightweight and flexible material handling hose for suction and pressure applications, suitable for all material transfer. Also available in suction- or pressure-only versions. Working range C. Textile reinforcement and steel spiral, earthing lead. CARBON Light Particularly lightweight flexible suction hose suitable for use as a working hose in industrial central vacuum cleaner systems, for example. Also applicable as a pipeline system hose for lighter applications. Working range C. Textile reinforcement and steel spiral. Teknikum 3

4 Connecting hoses Ød ØD R 90 h b b h Ød ØD 90 Ødu Ødu LER Flanged hose curves 90 These hoses are used to absorb vibrations in the pipeline. Working range: max. +70 C Construction: NR cover and lining LFR/LFS Flanged hose curves 45 These hoses are used to absorb vibrations in the pipeline. Working range: LFR: max. +70 C, LFS: max. +90 C Construction: LFR: NR cover and lining, LFS: NBR cover and LGR/LGS Flanged hose curves 90 These hoses are used to absorb vibrations in the pipeline. Working range: LGR: max. +70 C, LGS: max. +90 C Construction: LGR: NR cover and lining, LGS: NBR cover and LHR/LHS Straight connecting hoses For pressure applications. Working range: LHR: max. +70 C, LHS: max. +90 C Construction: LHR: NR cover and lining, LHS: NBR cover and ØD Ød L h Ødu LPR/LPS Compensators For pressure applications. Eliminates slow and slight heat expansions in the pipeline. Working range: LPR: max. +70 C, LPS: max. +90 C Construction: LPR: NR cover and lining, LPS: NBR cover and LSR/LSS* ) Valve hoses Used in concentration plants and paper and cellulose mills as dosage and regulation valves. Working range: LSR: max. +70 C, LSS: max. +90 C Construction: LSR: NR cover and lining, LSS: NBR cover and LTR/LTS Flanged T-branches These hoses are used to absorb vibrations in the pipeline. Working range: LTR: max. +70 C, LTS: max. +90 C Construction: LTR: NR cover and lining, LTS: NBR cover and LUR/LUS Compensators For vacuum applications. Eliminates slow and slight heat expansions in the pipeline. Working range: LUR: max. +70 C, LUS: max. +90 C Construction: LUR: NR cover and lining, LUS: NBR cover and and steel wire *) A metal choke device is required when used as a valve. Teknikum 4

5 Couplings GRANIT Select aluminium and D-RIM couplings Lightweight and compact coupling systems for GRANIT and TITAN hoses. Made of extremely durable antistatic material. Both consist of two-piece flange couplings with gasket. LIR/LIS Straight connecting hoses For vacuum applications. Working range: LIR: max. +70 C, LIS: max. +90 C Construction: LIR: NR cover and lining, LIS: NBR cover and. and steel wire ØD2 Ød2 L h Ød1 ØD1 LKR Reducers For vacuum and pressure applications. Can be used as a pipeline reducing fitting. Working range: max. +70 C Construction: NR cover and lining GRANIT Plus and TITAN plus Coupling system designed especially for GRANIT and TITAN hoses used in extremely demanding applications involving high working pressures. Note! When using this coupling, the hose will be manufactured in a certain length. Teknikum 5

6 Materials Special materials There are situations and applications that cannot be solved with material handling hoses equipped with standard linings. These include processes involving strong chemicals, oils or high temperatures. The material handling hoses can be customized to suit individual processes. The table below shows some examples of possible lining compounds. For further information, please contact Teknikum Oy or your local reseller. Standard materials NR Good wear resistance, hardness 40 ±5 ShA, light-coloured, nonstaining, electrically insulating. Temperature max. +80 C. The table includes electrical resistance limits for conductive and antistatic objects or materials (SFS handbook 150) and separately for the rubber hose (BGR 132): Conductive object or material Object or material that cannot store an observable amount of static electricity charge when earthed R < 10 4 Ωm Conductive rubber hose A hose with an electrical resistance of R < 10 3 Ωm SBR Excellent wear resistance, hardness 65 ±5 ShA, black, electrically conductive. Temperature max. +80 C. Special materials SBRT Good wear resistance, good chemical resistance, hardness 60 ±5 ShA. Temperature max C. Antistatic object or material Object or material that cannot store a significant amount of static electricity charge when earthed. Specific resistance*): 10 4 Ωm < R <10 9 Ωm and surface resistance: R < Ω Semi-conductive rubber hose A hose with an electrical resistance of 10 3 Ωm -1 R 10 6 Ωm -1 Can be handled like a conductive hose. NBR Good oil and animal/vegetable fat resistance. Hardness 70 ±5 ShA. Temperature max. +90 C. Also available in food grade. EPDM Excellent ozone, UV and chemical resistance. Hardness 70 ±5 ShA. Temperature max C, electrically conductive. CSM Excellent resistance to acids and alkalis. Good ozone, weather and chemical resistance. Hardness 55 ±5 ShA. Temperature max C. Not particularly flammable. Excellent resistance against various corrosive and oxidising agents. Insulating object or material Object or material with specific resistance of R < 10 9 Ωm measured at room air temperature and 50% relative humidity Insulating rubber hose Made of electrically insulating rubber materials. Cannot adequately discharge electrostatic charges. R > 10 8 Ωm -1 *) Electrical resistivity, or specific resistance, refers to the measure of how resistive any particular substance is relative to its size. The SI unit of electrical resistivity is (ohm-metre). The inverse of resistivity is conductivity. Teknikum 6

7 Only conductive or semiconductive rubber hoses can be used in explosive atmospheres. There are also specific requirements for the electric properties of chemical hoses, for example. In the EN standard, chemical hoses are divided into two groups: M-type hoses, in which electrical charges are removed through earthing lead, and the electrical resistance measured between the fittings must not exceed 10 2 Ω. Ω-type hoses are made of electrically conductive rubber materials, and the electrical resistance measured between the fittings must be below 10 6 Ω Measuring the electrical resistance of a material handling hose assembly: TITAN hose with TITAN Select coupling system. Electric properties of the hoses and couplings are always measured in type approval tests. If necessary, we can also test individual hoses or hose assemblies and provide a test certificate with the hose. Bending the hose When creating fixed curves or bended sections to a material handling pipeline, it is important to have a sufficiently long hose for the purpose. The required length can be calculated as follows: α 360 * 2 * (r+ø/2)=l curve where α = desired angle, r = given minimum bending radius, ø = hose outer diameter and L = length The above formula gives the length of the curved section, so the lengths required for the couplings have to be added. Thus, the length of the bent hose is L hose = 1,1 * (L curve + 2 * L coupling ), where 1.1 is the safety factor. The table shows the required GRANIT and TITAN hose lengths to form 45 and 90 bends with GRANIT or TITAN Select couplings. ID 45 L TITAN 45 L GRANIT 90 L TITAN 90 L GRANIT Teknikum 7

8 Download Established in 1989, Teknikum Yhtiöt Oy is the leading polymer technology group in the Nordic countries. Teknikum Group includes Teknikum Oy s factories in Vammala and Kiikka, Teknikum Sekoitukset in Kerava. In addition to Finland we also have factory in China and sales companies in Germany and Russia. The business group has about 400 employees, and its turnover about EUR 50 million. The product range includes hoses, plastic and moulded products, rubber coatings and linings, polyurethane and fluid silicone products, as well as rubber compounds, sheets and mats. In-house mould design, mixture development, and product and method design ensure that our products meet customer requirements and facilitate development in the future as well. Our customers are international technology companies, and a significant proportion of our product solutions are targeted at international markets. Moulded and plastic products Industrial hoses Polyurethane products Vibration dampening mats Wear elements Rubber linings Rollers Mill linings Vammala plant Kiikka plant Teknikum Oy P.O. Box 13 FI Sastamala, FINLAND Tel