Flapstopper - Pollution Containment Valve

The Flapstopper pollution containment valve is a drain closure device which can be used in emergency situations to seal off your drainage preventing any pollutants from escaping site, effectively turning your drainage into tertiary containment. Situations which would require the use of a drain closure device would include spillages, fires or during high risk times e.g. bulk fuel deliveries. It is installed within your at risk drains at a point where you wish to prevent any contaminants passing, often on the boundary of your site or local to a “lagoon” which will backfill in the event of an incident.

Pollution Containment Valve Activation Methods

The flapstopper can be activated manually, remotely or automatically.

Manually: Push a button on the above ground control panel which is hard wired to the flapstopper.

Remotely: Push a button on a control panel anywhere on site which connects to the flapstopper via telemetry closing the flapstopper.

Automatic Activation: Probes can be installed in your drainage to detect specific parameters e.g. pH, oils etc and activate once parameters are exceeded.

Alternatively automatic activation can mean it is linked to existing control system such as fire alarms or interceptor alarms to close in the event of an incident.  This makes it an effective system for inclusion in a Fire prevention plan for an environmental permit.

Pollution Containment Valve Application

We recommend the flapstopper for both proactive and reactive usage.

Reactive: In the event of an emergency (e.g. a spill or a fire) you can reactively close the Flapstopper sealing off the drainage and preventing any contaminants which enter the drains from leaving site. Once the emergency has been dealt with you can arrange for the drains to be emptied collecting all contaminants and preventing an environmental incident.

Proactive: A lot of our clients will use the Flapstopper as a precautionary measure. When they are conducting high risk activities on site, such as fuel deliveries. They close the Flapstopper before delivery begins. If the delivery passes without incident they release the flapstopper and normal water flow continues, however if they have a spill the contaminants are stored in the drainage system and collection can be arranged.

Benefits of the Flapstopper over other pollution containment valves

The Flapstopper is a long lasting and durable system and can be built to suit your site specific needs. The Flapstopper can be manufactured to fit almost any size drain and can withstand significant water pressure if a large head builds up behind it. They are stainless steel and fast closing slamming closed within seconds of activation. They are a far cheaper alternative to penstocks and require less disruption to site to install. It does not encounter common problems associated with bladder type systems such as punctures, being eaten by rodents and is more resistant to strong chemicals. All of these factors make the Flapstopper a reliable and cost effective form of tertiary containment.

Why Do I Need Tertiary Containment?

A Flapstopper is one of the least intrusive and cost effective ways of ensuring you have proper tertiary containment. All businesses can benefit from tertiary containment especially if you have a particularly high risk site, the cost of preventing an environmental incident by installing a flapstopper will be a fraction of the cost of a fine and clean-up costs that would be associated with a large scale spill or firewater incident.  Flapstoppers are often utilised under section 17 of a Fire Prevention Plan to help contain Firewater run off.

For upper tier COMAH sites it is a requirement of CIRIA 736 to have tertiary containment measures for use if secondary containment measures fail (as long as reasonably practicable). The Flapstopper can be utilised as part of a system ensuring you have adequate remote secondary containment/tertiary containment, and in fact the Flapstopper is featured in case studies within CIRIA 736 demonstrating effective containment techniques.


Other names for the Flapstopper

The Flapstopper is commonly referred to as a drain closure device however it is also often referred to by colloquial names including slam shut valve, shut off valve, drain pipe seal, tertiary containment valve and drain closure valve. If you are looking to source any of these or are looking for alternative to penstocks speak to us today to see if the Flapstopper is a suitable solution.

Testimonials for the Flapstopper

"We were impressed with the service received from GPT Environmental, from initial survey through install to final handover. The installation team persevered through inclement weather to complete the install.

The final installed system is neat and easy to operate"

Mechanical Engineer - GE Power

Pollution Containment Valve Case Studies

GE Power Flapstopper case study
drain closure valve case study
drain closure valve case study distillery
flapstopper drain closure device flyer

Extracts from pollution control valve legislation and guidance

“Drain pipe seals

Pipe seals can be used within a drainage system to prevent the escape of spillages from the temporary containment area, which can have the added advantage of using the pipe-full storage capacity of the pipe network.”

Containment systems for the prevention of pollution (C736)

“Shut-off valves and penstocks can isolate part or the whole of a site’s drainage system. They can help retain a spill on site…… They may be operated manually on site or triggered by automatic sensors.”

Dealing with spills: PPG 22

Need advice for services and products? Call us now 01656 741 799

Geo Pollution Technologies (UK) LTD - company number - 04689357


GPT head office is based in South Wales and covers all areas of South Wales, West Wales and Mid Wales including Cardiff, Swansea, Bridgend, Newport, Port Talbot, Powys, Llanelli, Neath, Pembrokeshire and Aberystwyth.

We also cover the South West of England from our premesis in Exeter including Cornwall, Devon, Taunton, Redruth, Truro, St Austell, Falmouth, New quay, Torquay, Paignton, Bristol, Plymouth, Bath, Gloucester and Somerset, .

We also operate across the midlands, London, Birmingham, Leicester, Northampton, Derby, Stoke, Nottingham, Coventry, Liverpool, Worcester, Southampton, Swindon, Manchester, Sheffield, Slough, Heathrow, Leatherhead and Surrey.