Flash vessels separate flash steam from hot condensate, recovering energy that would otherwise be wasted. Their internal components, baffles, demister pads, and level controls, are critical to efficient separation and must be maintained to prevent carryover and energy loss.
AQ Process Systems sources and exports replacement internals, instruments, and safety devices for flash vessels used in steam distribution systems, boiler blowdown heat recovery, and process condensate networks. We support both vertical and horizontal flash vessel configurations.
All pressure components are supplied with appropriate code certification (ASME, PED, or IBR) and material traceability for seamless integration into your plant maintenance programme.
| Component | Specification | Description |
|---|---|---|
| Internals | ||
| Baffle Plates | SS 304/316 | Internal flow directing | Internal baffles directing condensate flow and promoting separation of flash steam from liquid. |
| Demister Pads | SS wire mesh | 150mm depth typical | Wire mesh demister pads preventing liquid droplet carryover into the flash steam outlet line. |
| Vortex Breakers | SS plate | Drain outlet | Anti-vortex plates at the condensate drain outlet preventing steam pull-through into the drain line. |
| Level Control | ||
| Level Gauges | Reflex or transparent | With isolation valves | Direct-reading level gauges showing condensate level inside the flash vessel, with isolation and drain valves. |
| Level Transmitters | DP, guided wave radar, or displacer | Electronic level transmitters for remote monitoring and control of condensate level in the vessel. |
| Level Control Valves | Globe or cage type | Pneumatic or electric | Condensate drain control valves maintaining the correct liquid level inside the flash vessel. |
| Safety & Relief | ||
| Safety Valves | ASME VIII | Spring-loaded | Flanged | Pressure relief valves protecting the flash vessel against overpressure, set to vessel design pressure. |
| Pressure Gauges | Bourdon tube | Syphon-mounted | Steam pressure gauges with syphon tubes protecting the gauge element from live steam temperature. |
| Temperature Gauges | Bi-metallic or RTD | Thermowells | Process temperature indicators, both condensate and flash steam temperatures. |
| Nozzles & Fittings | ||
| Nozzle Connections | Flanged | CS or SS | Various sizes | Inlet, outlet, steam take-off, and drain nozzle connections, replacement for corroded or damaged nozzles. |
| Flange Gaskets | Spiral wound or kammprofile | ASME B16.20 | Gaskets for all flash vessel nozzle flanges, replaced during maintenance openings. |
| Drain Orifice Plates | SS | Calibrated bore | Orifice plates in the condensate drain line, sized to control flash steam percentage and drain flow rate. |
Parts are matched to OEM material specifications and dimensional tolerances. Please provide the equipment manufacturer, model number, and serial number (if available) for precise part identification.
The main maintenance items are demister pads (fouling and damage from condensate carryover), level gauges and transmitters (corrosion and scaling), safety valves (periodic testing and recertification), gaskets (replaced every opening), and drain orifice plates (erosion). Internal baffles and vortex breakers may need replacement in corrosive condensate service.
Demister pad replacement depends on the cleanliness of the condensate. In clean steam condensate systems, pads may last 5-10 years. In boiler blowdown flash recovery or process condensate with dissolved solids, scaling can foul the mesh within 1-3 years. Inspect during scheduled shutdowns and replace if pressure drop across the pad exceeds design values.
Yes. We supply ASME Section VIII certified safety valves sized for flash vessel service, set pressure matched to the vessel's Maximum Allowable Working Pressure (MAWP). Valves are supplied set, tested, and sealed with certification documentation.
The vortex breaker is a flat plate installed above the condensate drain nozzle inside the vessel. Without it, the draining condensate can form a vortex (whirlpool) that pulls flash steam down into the drain line, wasting energy and causing water hammer in downstream piping. It is a simple but critical component.
Yes. We supply level gauges (reflex and transparent type), electronic level transmitters (differential pressure, guided wave radar, and displacer types), and level control valves for flash vessel condensate level management. Instruments are rated for the vessel's operating pressure and temperature.
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