ENSIGN Venturi Insert - Debris Screen

• Proven design for power station main condensers
• Prevent debris jamming in and blocking condenser tubes
• Prevent tube leaks
• Postpone or completely avoid expensive re-tubes
• Venturi inlet profile
• Self-expanding
• Non metallic, will not create or add to galvanic problems
• Compatible with nylon brush type tube cleaning
• Suitable for new and worn tubes

A common problem in power station main condensers is debris such as stones, coal, shale, mussel shells etc jamming in and blocking condenser tubes. Debris trapped at the tube inlet aggravates tube inlet damage and increased flow velocities around partial blockages part way down a tube can very quickly remove protective films and cause tube leaks to develop. ENSIGN Debris Screen debris at the tube sheet to prevent blockages and leaks, whilst also preventing inlet erosion / corrosion of the tube inlets.

The water naturally present in a condenser is utilised to expand a full condenser installation into all of the tubes in unison. No need for manual expansion or painting of each individual tube. Very easy and quick to fit by unskilled personnel.

Crude ill fitting metal and plastic inserts are likely to eventually encourage end step erosion. This is often managed my introducing a longer insert after a few years in service. The tube material, insert fit and expansion, flow conditions, coolant composition and insert design and quality are amongst the contributory factors. The particular solid (metal, plastic or ceramic) from which the insert is manufactured is not an influence.

The design and quality of ENSIGN Venturi Inserts has enabled numerous power station installations in erosion prone copper alloy tubes to remain in continuous service for well over 20 years. Our longest recorded service life to date is over 25 years.