Pyroban® has recently supplied another two Cat® 3406 “Pyroban kits” featuring Ever Clear™, the long life exhaust flame arrestor, to a customer in Singapore. The engines will power two 180k nitrogen pumps in ATEX Zone 2 areas offshore and do not need operators to clean the exhaust flame arrestors on a daily basis.

The customer, a major service company, values all the benefits that the 1000 hour flame arrestor maintenance intervals bring while the units will be in operation offshore. The aim is to reduce operational downtime and increase safety even further for personnel offshore.

Ever Clear exhaust flame arrestors act as a direct replacement for the traditional “plate type” flame arrestors found in Pyroban explosion protected diesel engines. Specifying Ever Clear puts a stop to the 8-hour cleaning routine which would normally have to take place.

With traditional “plate type” flame arrestors, exhaust gas has to flow through the restrictive narrow gaps in the flame arrestor, so it clogs up with soot relatively quickly.

ATEX nitrogen pumps get Ever Clear to increase uptime and safety in Singapore

Ever Clear exhaust flame arrestors enable the exhaust gases to pass without clogging and are positioned in the exhaust system between the turbo and gas cooler, on the “hot side” of the exhaust flow (as seen above).

Photo Credits: Tang Seng –

ATEX nitrogen pumps get Ever Clear to increase uptime and safety in Singapore

They operate for up to 1000 hours before any cleaning is required (dependent on diesel quality & duty cycle). They allow the engine exhaust gases to pass through but will stop a flame in the event of an exhaust backfire caused by hydrocarbon gas ingestion.

Operators can now get on with the job in offshore oil and gas applications. Operators and asset owners also overcome the safety risks associated with wrongly using a ‘dummy arrestor’ which can expose the operation to sources of ignition and invalidate the whole Pyroban system.

ATEX nitrogen pumps get Ever Clear to increase uptime and safety in Singapore

Manual handling compliance issues also disappear with Ever Clear. The traditional plate type exhaust flame arrestors typically weigh over 25kg and are usually located above waist height making them hard to handle. The image above clearly shows the absence of a dummy or plate type exhaust flame arrestor.

These new explosion proof Cat 3406 Pyroban kits included Ever Clear straight from the factory. As with all our ATEX engines, we confirmed performance and safety integrity with thorough Flame Non-Transmission Testing in Pyroban’s own Test Facility at Shoreham by Sea, UK.

ATEX nitrogen pumps get Ever Clear to increase uptime and safety in Singapore

The ATEX engine kits featured the full Pyroban explosion protection kit including an air inlet shut-off valve, air inlet flame arrestor, exhaust gas heat exchanger, thermal control and treatment, exhaust flame arrestor, spark arrestor and more.

These ATEX engines will be supported by the Pyroban technical team with additional assistance in the field as required by Pyroban’s specialist team of engineers with all necessary paperwork and experience for offshore deployment anywhere in the world.

Ever Clear for existing equipment?

Ever Clear is also suitable for existing Pyroban protected turbo diesel engines above 100bhp that are already in active service. For example, it is possible to retrofit Ever Clear to existing ATEX explosion proof Cat 3406 engines (i.e with side mounted Pyroban kits) already in operation offshore.

So if you are repairing or refurbishing Cat 3406 driven equipment or any other ATEX powerpack, consider upgrading the exhaust system with Ever Clear to safely enjoy up to 1000 hour cleaning intervals. As an equipment supplier, it is major benefit that your customers will be drawn to.

Calculate how much you could save with Ever Clear exhaust flame arrestor.

For more information contact our technical sales team on +44 (0) 1273 456800 or

Photo Credits: Tang Seng –