Spirax Marshall Moisture Separator: Steam Quality & Water Hammer Protection

The Spirax Marshall Moisture Separator is an industrial pipeline device designed to extract entrained water droplets and moisture from steam, compressed air, and process gas lines. By removing liquid condensate from high-velocity steam flows, it prevents severe water hammer, reduces pipeline erosion, and restores optimal heat transfer efficiency across downstream process equipment.

Available in cast iron and cast carbon steel constructions, these separators utilize internal baffles to force liquid droplets out of suspension for immediate drainage via a connected steam trap.

Core Performance & Advantages

• Prevents Water Hammer & Erosion: Eliminates liquid slugs before they strike downstream control valves, meters, or turbine blades.
• Improves Steam Dryness: Increases the overall dryness fraction of steam, maximizing latent heat transfer in heat exchangers.
• Dual Body Metallurgy: Available in IS 210 FG 260 Cast Iron for standard utility lines and ASTM A216 Gr. WCB Carbon Steel for high-pressure systems.
• High-Efficiency Baffle Design: Internal baffle plates force abrupt directional flow changes, causing heavy water droplets to drop into the collection sump.
• Broad Size Range: Covers pipeline sizes from 15 NB to 250 NB with screwed or flanged end connections.

Technical Specifications

Installation Best Practices

• Proper Drainage: Always attach a high-capacity ball float steam trap (e.g., Spirax FT series) to the bottom drain port to discharge collected condensate automatically.
• Pipeline Placement: Install directly ahead of pressure-reducing valves (PRVs), flowmeters, and critical steam-using equipment.
• Insulation: Fit an insulation jacket around the separator body to prevent ambient radiation heat loss and re-condensation.