Clean Steam Generators for Hygienic Steam Systems

Important scope and safety notice

This section is a structured visitor-facing extraction of the selected Spirax Sarco installation and maintenance manuals. It preserves the safety boundaries and the sequence logic needed to understand the package. It is not a replacement for the current manual supplied with the ordered unit, the component manuals, the nameplate, the wiring diagram or the local pressure and electrical regulations.

• Identify the exact model, serial number, nameplate limits, design drawing and document set before connecting services.

• Isolate primary steam, clean steam, feedwater, condensate, pneumatic air and electrical power before installation or maintenance.

• Safely vent residual pressure to atmosphere and allow hot surfaces and water to cool. A zero gauge reading is not proof of depressurisation.

• Wear suitable protective clothing and use a permit-to-work and lockout procedure where required by the site.

• Route safety-valve, blowdown, drain and non-condensable-gas discharges to safe, compliant destinations. Never block or intercept a relief path.

• Use suitable lifting equipment and lift from the approved base or lifting points only. Leave access for tube-bundle, deaerator and control-panel maintenance.

• Keep clean-steam connections capped until the connection is ready. Do not introduce dirt, scale, incompatible gaskets or construction debris into the clean side.

CSM-C installation and maintenance

Source: IM-P486-05, CSM-C Steam Compact Clean Steam Generator Installation and Maintenance Instructions. CSM-C packages are intended for indoor use on a level support capable of carrying the filled unit. The manual recommends at least 1000 mm of clear access at the front and rear. Site-specific drawings govern the connection positions and any lifting or seismic provisions.

Installation sequence

1. Inspect the delivered package, nameplate, pressure components, control cabinet, documentation and protective covers. Do not install a damaged or non-conforming unit before it is reviewed.

2. Clean and blow through connecting pipework so foreign material or scale cannot enter the feedwater or clean-steam sides.

3. Connect the treated feedwater supply to the feedwater inlet and provide an upstream manual isolation valve, kept closed until installation is complete.

4. Connect the generated clean-steam outlet to the clean distribution line and provide a downstream manual isolation valve, kept closed until installation is complete.

5. Pipe the pressure safety valve to a suitably sized safe vent and drain. The discharge must comply with local standards and must not expose personnel or equipment to released steam.

6. Connect primary plant steam, condensate return and drains. Use clean-steam-compatible flanges, sanitary connections and gaskets where specified.

7. Connect the pneumatic supply, typically 6 bar g, and the electrical supply according to the supplied wiring diagram. Electrical work is for qualified electricians.

8. Connect the vessel bottom blowdown and any pre-heat tank overflow or sample points. Blowdown can flash to steam and must be safely piped.

9. Verify grounding, isolation valves, relief routes, instrument connections, pipe supports, insulation and access before commissioning.

Commissioning and operation

After a safety officer or responsible competent person has checked all connections, open treated-water isolation gradually and confirm the displayed tank and generator levels. Reset any expected low-level alarm, verify the feedwater pump direction where fitted, and check the pre-heat tank temperature and level. Introduce primary steam slowly, observe the programmed tank temperature and generator pressure, and open the clean-steam outlet gradually once the operating set point is reached. Confirm alarms, automatic isolation and the clean-steam route before accepting load.

For a planned stop, close primary steam and treated-water isolation, allow pressure to fall, close the clean-steam outlet and condensate isolation as directed by the manual, and protect the package against freezing. Emergency stop or abnormal conditions require isolation of primary steam, feedwater and clean steam followed by safe venting and competent investigation.

Maintenance focus

• Check primary and clean-steam pressures daily and investigate abnormal changes.

• Maintain feedwater quality and adjust blowdown frequency to the water and TDS condition. Blowdown must discharge safely.

• Inspect the safety valve, drains, traps, control valves, level instruments, temperature probe and pressure transmitter at the intervals in the supplied schedule.

• Use the manual cycle and maintenance sections for pump purging, valve inspection, gasket replacement and component-specific work. Re-test after work before returning to service.

CSM-K installation and maintenance

Source: IM-P486-10, CSM-K High Capacity Clean Steam Generator Installation and Maintenance Instructions. CSM-K is a large pressure package. The unit is for indoor use unless the design specification states otherwise and needs a level support capable of carrying the filled weight. Provide at least one metre of clearance around and above the unit, plus the tube-bundle extraction and service space shown on the approved drawing.

Transport and connection planning

• Assess the route, lifting plan, floor loading, access platform, ventilation, lighting and protection from weather or freezing before unpacking.

• Inspect the vessel, frame, valves, instruments, control cabinet, safety equipment and supplied component manuals. Confirm that the configuration matches the design specification.

• Connect feedwater, generated clean steam, the selected energy source, energy-source return or condensate, safety/pressure-relief discharge and drains.

• Install manual isolation valves and strainers where specified. Provide clean-steam check and isolation valves, primary-steam isolation and trap sets as required by the installation.

• Connect the 6 bar g compressed-air supply where pneumatic controls are fitted and the 400 V 3-phase 50 Hz electrical supply through a correctly rated fused isolator.

• Support external pipework independently so no external stress is transferred to the generator nozzles. Check flange alignment and bolt torque.

Start-up, shutdown and maintenance

Before start-up, close the manual isolation valves, verify that all lines are drained or vented, confirm the relief system and safety controls, and check that the clean-steam and water sides meet the nameplate conditions. Open services slowly in the sequence specified by the supplied manual, establish feedwater level, introduce the energy source, confirm pressure and level control, and then bring the clean-steam outlet onto the process gradually. Do not bypass trips, high-pressure protection, low-level protection or relief devices.

For shutdown, isolate the energy source and feedwater, allow the package to depressurise and cool, isolate the clean-steam and condensate outlets and drain only through the approved routes. Maintenance includes inspection of the vessel, tube bundle, valves, traps, gauges, safety system, control components and gaskets. Use genuine replacement parts and re-test pressure, control and safety functions before returning the unit to service.

m-CSG installation, food-contact cleaning and maintenance

Source: IM-P486-21, m-CSG Ultra-compact Clean Steam Generation System Installation and Maintenance Instructions. The package is installed indoors and must be protected from freezing. Lift it from the base using suitable equipment. The exact connection positions, support details and clearances come from the general arrangement drawing.

Connections and pre-commissioning

1. Inspect the frame, generator, control panel, instruments, protective covers and documentation. Check the model, version H or F, pressure settings and required utilities.

2. Connect the clean-steam outlet, feedwater inlet, generator drain, primary plant-steam inlet, condensate outlet, safety-valve discharge and optional TDS/sample connections.

3. Use clean, supported pipework and suitable gaskets. Install the clean-steam isolation valve downstream and a check valve when generators operate in parallel.

4. Connect electrical power and, where fitted, instrument air between 3 and 15 bar g. Verify grounding, emergency stop, local/remote start and cumulative alarm wiring.

5. Check the safety valve discharge and bottom blowdown routing. Blowdown is at generated-steam pressure and temperature and must not be returned to feedwater or condensate.

6. Flush construction debris from the connected lines, confirm water and primary-steam design conditions, and verify that the downstream system can accept the safety-valve setting.

Commissioning and control logic

Open services gradually, prime the feedwater line and introduce primary steam through the heating ramp. The pressure regulator or PLC modulates the primary valve from the clean-steam pressure signal; the level regulator or PLC modulates feedwater. High pressure, low level, high level, loss of air and power failure interlocks close or restrict the relevant valves. TDS control and blowdown must be set to the feedwater and generator water condition.

For the F food-and-beverage version, complete the end-user cleaning-in-place cycle before the first food-contact application and retain the declaration of conformity and contact-material list. This cleaning step is not optional packaging guidance; it is part of the documented food-contact boundary.

Normal stop and maintenance

Close primary steam, allow pressure to fall, drain or blow down through the approved route, close feedwater and other isolations and protect the system against frost. Follow the manual for regulator checks, valve and trap inspection, level and pressure instrumentation, TDS calibration and component replacement. After maintenance, confirm that the pressure relief path, interlocks, cleanliness and operating set points are restored.

CSG-HS healthcare installation and commissioning

Sources: TI-P663-01, TES Issue 12, and IM-P663-02, TES Issue 11. CSG-HS must be installed indoors, with an ambient temperature above 0 deg C and protection from freezing. The package requires access for tube-bundle and deaerator extraction. Size 020 and 055 are lifted from the base with a forklift or transpallet; sizes 125 and 180 use the lifting eyes installed on the base frame. Never lift from the vessel, pipework, cabinet or another component.

Pre-installation checks

• Complete the document review and site-acceptance checks. Confirm the nameplate, model, pressure/temperature design data, selected options and the supplied P&ID.

• Verify that the foundation, lifting method, lighting, access platform, pipe supports and maintenance clearances are suitable.

• Connect size-specific primary steam, condensate, clean-steam, feedwater, safety-valve, non-condensable-gas vent, drain, TDS blowdown and sampling lines from the approved drawing.

• Ensure the primary steam and feedwater lines are pressurised only within the design data and are drained or vented before start-up. Confirm the clean-steam downstream design is not below the unit or safety-valve rating.

• Connect electrical power, earth and any pneumatic actuators according to the wiring diagram. Use qualified electricians and maintain the control-panel IP rating.

• Keep the clean side protected from contamination. Use only materials and tools that do not compromise the required steam cleanliness.

Cleaning and on-site commissioning

The package is supplied after a pickling and passivation cycle, but installation can introduce dirt into pipework. Complete the documented cleaning cycle to flush the feedwater line and generator before normal production. During the site-acceptance and commissioning sequence, check filters, manual isolation valves, drains, safety-valve piping, grounding, sensors, flange torque and any optional condensate cooler or integrity-test equipment.

1. Close manual steam, condensate, clean-steam and feedwater isolations while checking that all connected services are available and critical alarms are clear.

2. Open the required condensate, drain, vent, feedwater and non-condensable-gas paths. Prime the feedwater line and check the pneumatic positioners where fitted.

3. Power the control panel, select the documented first-start sequence and enter the correct clean-steam pressure and water-level set points.

4. Run the first cleaning cycle, introduce plant steam gradually, and follow the HMI instructions. Repeat an integrity test if a leak is detected.

5. Use the PID tuning sequence to simulate high and low demand, complete the tuning confirmation and verify stable pressure and water level before opening the process outlet.

Operation, shutdown and maintenance

The PLC maintains clean-steam pressure through a pressure PID loop and primary-steam control valve and maintains water level through a level PID loop and feedwater valve. Automated start-up raises the water level, opens configured isolation valves, verifies temperature and pressure and ramps to set point. Automated shutdown reduces the level and steam set point, closes the primary supply and stops water control after the documented temperature condition is reached.

For a planned outage, isolate primary steam, feedwater, clean steam and condensate, vent and drain safely and protect the unit from freezing. Check the TDS limit, blowdown route, non-condensable-gas vent, filters, control valves, sensors, safety devices, insulation and the condition of the clean side at the intervals in the supplied service schedule. A change in operating pressure can require recalibration of the expansion vessel, feedwater and steam valve trims, sensors and PID settings; do not simply change the set point without the manual's recalibration checks.