Loop return – monitoring/control unit for distribution systems
The loop return is an integral part of every ultrapure water or WFI distribution system. The medium circulates continuously through the closed stainless steel pipe ring and is fed back into the storage tank at the return point.
The design ensures a consistent flow without dead zones and enables thermal or chemical sanitization of the entire main loop, including one or more sub-loops. Conductivity, temperature, pressure, quality parameters, and flow rate are continuously monitored and controlled via the system's control unit.
The return line is fully GMP and FDA compliant, validatable, and made of electropolished AISI 316L stainless steel. Optionally, the return line can be equipped with pressure equalization, a redundant pump, or UV disinfection to maximize microbiological safety and system availability.Special features / characteristics:
- Hygienic, CIP/SIP-compatible pipe system made of AISI 316L
- Dead space-free design with permanent circulation
- Custom design according to specifications, e.g. with UV protection
- Constant temperature control according to USP for biofilm prevention
- Fully automated monitoring and data recording
- GMP and FDA compliant design with orbital welding
- Integration into automation systems with alarm management
👉 Advantage:
Safe and verifiable dispensing of ultrapure water or WFI with consistent quality to all dispensing points and possible SUP loops.
Maximum hygiene, stability and process reliability throughout the entire distribution cycle.
Application:
The loop return system monitors and controls a closed ultrapure water or WFI distribution system. It ensures constant circulation of the medium at the required flow rate, temperature, pressure, and microbiological quality. The system prevents pressure losses in the network, biofilm formation, and supply losses at the taps in the distribution network.
Technical data:
parameter specification Flow rate 0.5 – 220 m³/h (system-specific) material AISI 316L (material 1.4404), possibly electropolished Surface roughness Ra ≤ 0.8 µm or smaller Operating temperature 20 – 85 °C Connection type Orbital welding, aseptic flanges or Tri-Clamp Documentation / Execution 3D / Hand Isometry Sensors Conductivity, temperature, flow rate, pressure Options CIP/SIP capable, redundant pumps, UV sterilization, automation (Siemens/Rockwell PLC)