Hot Water Systems
Purified Plus Water Systems
Heat Exchangers
Thermal Control System
Hot Water Systems

Purified Plus Water Systems

S2 Engineering provide a range of standard and bespoke USP Purified water sanitation skid systems for use in the pharmaceutical, food and beverage industry sectors and clean utilities. Our Purified Plus range is our highest regulatory compliance water system complete with MCF's and UF.
Each S2 Engineering USP purified water skid system is designed from an in-depth understanding of the Purified Water process and regulatory compliance to USP, EP and/or JP. We also offer a wide range of options in addition to multi-pass reverse osmosis and ion exchange.
Our turnkey Purified Plus skid systems incorporate a stainless steel storage tank, sealed water circulation pump, flexible stainless steel hose pipes, micron cartridge filters (MCF's) and Ultra Filtration (UF), water heating system, sampling valves, drain valves and all sensor inlet valves. The Sunrax Purified Plus system can be configured to suit the following application duties;

  • Individual clean hot water generator – Temperature up to 95°C (203°F)
  • Individual clean cold water generator – Temperature up to 10°C (50°F)
  • Combined clean hot & cold water generator – Temperature range 30°C to 95°C (86°F to 203°F)

Our modular solutions include a range of pre-treatment systems each supplied with their own controls or configured for operation as part of a central control system. Some of the key design and technical features of the S2 Engineering systems include;


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Operational Benefits

  • Consistent and reliable 100% quality water supply
  • Stable and accurate sensor/instrumentation feedback for ideal system management (where specified)
  • Clear visibility of system operational performance: Digital display, lights & alarms (where specified)
  • Operationally safe
  • Energy efficient
  • Operational savings through increased productivity and process uptime.
  • Quality, low maintenance, robust construction


Applications for S2 Engineering skid purified plus water systems vary from industry sector to industry sector, but can include;

  • Pharmaceutical Water Systems including Purified Water (PW) and Sterile Purified Water (SPW)
  • Water for Irrigation
  • Sterile Water for Injection (SWFI)
  • Water for Irrigation

Technical Features

S2 Engineering Purified Plus water systems are designed to a range of Current Best Practice standards and international specifications. Each governing body (or pharmacopaeias) has its own definition of a purified water system and the corresponding water quality specification. For example,

  • US Pharmacopeia (USP): “. . .obtained by a suitable process” so that Conductivity ≤ 1.3 µS/cm @ 25º C, Total Organic Carbon (TOC) ≤ 500 ppb, Microbial ≤ 100 cfu/ml and No endotoxin requirement"
  • European Pharmacopeia (EP): “. . .prepared by distillation, by ion exchange, by reverse osmosis or by any other suitable method”
  • Japanese Pharmacopeia (JP): “. . .purified by distillation, ion-exchange treatment, ultrafiltration or combination of these methods”

Design Features

S2 Engineering Hot Water modular systems are designed to Current Good Manufacturing Practice (cGMP) and include the following design features.

  • Tank and pipework materials of construction for optimum chemical and heat compatibility are typically Stainless Steel (316 or 316L)
  • Elastomeric members such as gaskets and diaphragms are typically Teflon, EPDM, Silicone and Viton (FDA approved where required)
  • The tanks are designed to be fully drainable (minimum slope 1/8” per foot
  • Hygienic tank and system design of components - no bug traps
  • Minimize Dead Legs (<= 2 pipe diameters)
  • Smooth Surfaces - high mechanical polish/buff
  • Mechanically sealed centrifugal Pump or Canned motor pump providing leak tight pumping.
  • Gasketed or welded plate heat exchanger providing efficient and quick heat transfer.
  • 2 way or 3 Way Globe Control Valve providing accurate temperature control of uid and product.
  • Expansion tank to accommodate volume changes expected in thermal fluid.
  • Strainers and non return valves for pump and equipment protection.
  • Temperature transmitters and Pressure gauges for measurement of operating parameters.
  • All electrical components like drive motor, wiring in flameproof construction.
  • Seamless pipes and fitting in SS304 or on specific requirement.
  • PID or PLC based control system.
  • Simple Flameproof Operating Panel or IS HMI as man –machine interface.
  • All components are assembled on compact skid to reduce installation and testing time at site.
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