The steam condenser converts exhaust steam back to condensate while maintaining vacuum at the turbine exhaust. Condenser performance directly affects turbine output, every 1 mbar of vacuum degradation reduces power output by approximately 0.3-0.5%. Tube fouling, air in-leakage, and tube failures are the primary maintenance challenges.
AQ Process Systems sources and exports condenser tubes, tube sheets, water box components, air removal equipment, and all associated parts for condenser maintenance and retubing projects. We support both once-through and recirculating cooling water systems with appropriate tube materials.
Condenser tube material selection is critical, we supply titanium, stainless steel, copper-nickel, and aluminium brass tubes matched to the cooling water chemistry and chloride levels, ensuring maximum tube life and minimum maintenance cost.
| Component | Specification | Description |
|---|---|---|
| Tubes & Tube Sheets | ||
| Condenser Tubes | Ti Gr.2, SS 316, CuNi 90/10, Al-Brass | Welded or seamless | Replacement condenser tubes, material selected for the cooling water chemistry. Supplied in mill lengths or cut to size. |
| Tube Sheets | Naval brass, SS, or CS clad | Drilled to pattern | Replacement tube sheets or tube sheet overlays, drilled, reamed, and grooved for tube expansion. |
| Tube Support Plates | CS or SS | Drilled to tube pattern | Intermediate tube support plates preventing tube vibration, drilled with anti-vibration features (broached holes or trefoil). |
| Tube Plugs | Taper, pop-in, or welded | Isolating leaking tubes | Tube end plugs for isolating failed tubes, a fast temporary repair to maintain condenser integrity until retubing. |
| Water Boxes | ||
| Water Box Covers | CS or SS | Bolted or hinged | Water box end covers providing access to tube ends for inspection, plugging, and cleaning. |
| Water Box Gaskets | Rubber or neoprene | Full-face type | Sealing gaskets between water box covers and the condenser body, replaced during every water box opening. |
| Sacrificial Anodes | Zinc or aluminium | Cathodic protection | Cathodic protection anodes inside water boxes, preventing galvanic corrosion of tube sheets and water box internals. |
| Air Removal | ||
| Steam Jet Air Ejector Nozzles | SS | Converging-diverging | Motive steam driven | Ejector nozzles and diffusers for steam jet air ejector systems, maintaining condenser vacuum by removing non-condensable gases. |
| Vacuum Pump Components | Liquid ring or rotary vane | Mechanical air removal | Spare parts for mechanical vacuum pumps, impellers, mechanical seals, bearings, and seal water systems. |
| Inter-Condenser Tubes | SS or CuNi | For multi-stage ejectors | Tube bundles for inter-condensers and after-condensers in multi-stage steam jet ejector systems. |
Parts are manufactured to OEM specifications with full material certification, dimensional inspection, and NDE documentation as required. Provide the turbine manufacturer, frame/model designation, and part number for precise identification.
The most common spares are tube plugs (isolating leaking tubes), water box gaskets (replaced during every inspection), sacrificial anodes (consumed over time), air ejector nozzles (erosion), vacuum pump seals and bearings, and cleaning equipment. Complete retubing is needed every 15-30 years depending on tube material and cooling water quality.
Tube material depends on cooling water: titanium Grade 2 for seawater and brackish water (longest life, highest cost); stainless steel 316 for fresh water with moderate chlorides; copper-nickel 90/10 for seawater (good but less than titanium); aluminium brass for clean fresh water (lowest cost). We help select the optimal material for your cooling water chemistry.
Most condenser designers allow up to 10% of tubes to be plugged before performance degradation becomes significant. Beyond this, the reduced heat transfer surface causes elevated backpressure and turbine output loss. When plugging approaches 10%, or when tube failure rate is accelerating, retubing should be planned.
Yes. We supply nozzles, diffusers, and inter-condenser tube bundles for steam jet air ejector systems, as well as impellers, seals, bearings, and seal water components for liquid ring and rotary vane vacuum pumps. We support both OEM-supplied and third-party air removal equipment.
The main causes are air in-leakage (through expansion joints, flanges, and instrument connections), tube fouling (biological, scaling, or debris), tube failures (tube-to-tubesheet leaks allowing air ingress), cooling water temperature rise (seasonal or fouled cooling tower), and air removal system malfunction (ejector nozzle erosion or vacuum pump wear).
Share your turbine make, model, and part numbers, we respond within 24 hours.