CHEMSPIN twin-screw pumps can also be used in ATEX Zones 1, 2, 21, and 22. Hereby, and depending on pumping temperature, temperature classes T2 to T4 can be realised. The contact-free conveying principle is of advantage here. Also the CHEMSPIN ES with lengthened screws is available as an ATEX version
Hereby, the ATEX concept consists of the following measures:
• Use of flameproof enclosed motors for speed control
• Surface temperature monitoring with sensors on pump housing and bearing supports
• Maintaining seal temperatures by means of a monitored flushing system for double-acting floating ring seals
• Dry running is prevented by monitoring with single-acting floating ring seals
• Non-failsafe couplings or spark suppression using couplings in an oil bath
• Non-sparking contact protection for base plate devices
• Earthing connections for equipotential bonding
Dry-run safe units with corresponding shaft seals can be supplied.
Advantages at a glance
- Very high flexibility
Many different products and a wide range of flow quantities and viscosities can be handled by a single pump. Reverse operation is possible – the range of different pumps in a plant can be reduced considerably. - Safe operation
Loaded, abrasive or lumpy media can be conveyed – a suitable shaft seal can provide dry-run protection. Very low vibration and noise levels. - Low cavitation risk
The CHEMSPIN exhibits very low NSPH values. This applies for the full operating range, also for operating points close to zero throughput. Increasing pump speeds and viscosities only have a limited effect. - Self-priming, able to handle entrained gas
Outstanding suitability for emptying & transfer pumping operations. - High chemical resistance
The CHEMSPIN is made of 1.4404 stainless steel as standard. Hardened pumping elements and contactless operation ensure high wear resistance.
Technical data / performance features
| Type | CHEMSPIN 50 | CHEMSPIN 70 | CHEMSPIN 90 | CHEMSPIN 105 | CHEMSPIN 125 |
| Max. capacity | 20 m³/h | 40 m³/h | 100 m³/h | 180 m³/h | 300 m³/h |
| Max. delivery pressure | 20 bar | 25 bar | 30 bar | 20 bar | 35 bar |
| Max. ø of solids | 16 (25) mm | 20 (30) mm | 28 (45) mm | 35 mm | 46 (64) mm |
| Suction capacity | NPSHr >0.5 m, suction heights up to 9 m possible | ||||
| Viscosity | 0.5 to 1 000 000 mPa·s, higher values after consultation | ||||
| Pumping temperature | -10 to 180 °C, higher values on request | ||||
| Cleaning | full CIP cleaning in the plant | ||||
| Sterilisation | SIP in the plant with steam or hot water | ||||
| Product-wetted parts | Choice of 1.4404, 1.4539, or 1.4462 – other materials on request | ||||
| Elastomers | HNBR, FPM, EPDM, FFPM, FDA approval, other elastomers on request | ||||
| Shaft seals | Single and double-acting floating ring seals, with knife edge for sticky media to prevent start-up damage, single-acting, dry-run safe lip seal | ||||
| Pump orientation | horizontal, vertical, or sideways (INLINE versions possible) | ||||
| Connections | Different sizes and connecting standards after agreement | ||||
| Models | Compact, robust modular design for all versions, with free shaft end for sizes 70, 90, and 125 | ||||
| Drives | Three-phase, gear, or servo-motors (hygienic stainless steel drives as an option) | ||||