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.
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 by the system's control unit.
The return line is GMP and FDA compliant , validatable , and made of electropolished AISI 316L stainless steel. Optionally, the return line can be equipped with features such as pressure equalization , a redundant pump , or UV disinfection to maximize microbiological safety and system availability.
Application
The loop return system monitors and controls a closed ultrapure water or WFI distribution system . It ensures constant circulation of the medium – with the required:
- Flow velocity
- temperature
- Pressure
- microbiological quality
The system helps to prevent pressure losses in the network, biofilm formation and supply losses at the taps in the distribution network.
Special features / characteristics
- Hygienic, CIP/SIP-compatible pipe system made of AISI 316L
- Dead space-free design with permanent circulation
- Custom designs according to specifications (e.g. with UV , depending on the design)
- 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 delivery of ultrapure water or WFI with consistent quality to all dispensing points and possible sub-loops – for maximum hygiene, stability and process safety throughout the entire distribution circuit.
Technical data
Flow rate: 0.5 – 220 m³/h (system-specific)
Material: AISI 316L (material 1.4404), possibly electropolished
Surface roughness: Ra ≤ 0.8 µm or less
Operating temperature: 20 – 85 °C
Connection type: Orbital welding, aseptic flanges or Tri-Clamp
Documentation / Execution: 3D / Hand-held isometric drawing
Sensors: Conductivity, temperature, flow rate, pressure
Options: CIP/SIP capable, redundant pumps, UV sterilization, automation (Siemens/Rockwell PLC)
contact
For the appropriate design and integration into your ultrapure water or WFI distribution network, please use the contact form below.
Modular design & extensions
WFI distillation plant – multi-column distillation