How it works

How it works

Our products may all look very different, but they all perform the same function – 'trapping' steam in your steam system while removing hot condensate. Steam Esco Green Saver steam traps function according to the basic principles of fluid dynamics, allowing them to operate efficiently, cost effectively and with minimal wear and tear on the units themselves. Here's how.

The Bernouilli Principle

The Swiss mathematician and physicist Daniel Bernoulli first published his findings on fluid dynamics in his book Hydrodynamica in 1738. He was the first to discover the direct relationship between the speed and pressure of a fluid flowing through a pipe. Bernouilli’s principle states that any increase in velocity occurs simultaneously with a decrease in pressure in accordance with Bernouilli’s Equation.


The Venturi Effect

Later in the 18th century, the Italian physicist Giovanni Battista Venturi established that the pressure of a fluid can be reduced by constricting the diameter of the pipe it flows through. On the basis of Bernoulli’s equation, we can therefore calculate the extent to which this ‘choke’ will increase the velocity of the flow. This phenomenon of simultaneous pressure reduction and velocity increase is commonly used in flow metres, as well as pumps and atomizers.


The Flash

Our Green Saver steam traps contain a custom-designed nozzle technology that creates a constriction in the pipe to dramatically reduce the pressure of the gas leaving the nozzle outlet. This drop in pressure is sufficient to convert the condensate back into steam in a process known as a ‘flashing’. The ‘flash’ creates a back pressure zone in the nozzle that blocks the flow of steam. Because condensate is 1,000 times denser than steam, it is able to pass through this back pressure zone, while leaving the steam ‘trapped’ in the system. As more condensate passes through the nozzle, the flashing process is repeated, allowing the back pressure to be maintained.


USS Nautilus

This type of steam trap was first used in USS Nautilus, the world’s first nuclear submarine, which first entered service in 1954. Under the sea, steam traps need to operate reliably in a variety of conditions, including when the submarine is diving at an angle. This ruled out conventional mechanical systems.



Steam Esco Green Saver steam traps can generally save between 10% and 35% on the total cost of steam, as well as reducing emissions. Because there are no moving parts, they are reliable, compact and easy to install. As a result of these secondary benefits, they also offer huge savings over conventional, mechanical steam traps when it comes to maintenance – Green Saver steam traps can operate for 20 years or more without requiring replacement.

Why Steam Esco?

Not only do we hold patents on our Green Saver technology, we also have the experience and expertise to install our steam traps in a wide variety of industrial settings. In order for our steam traps to function effectively, each one needs to be optimised for the given environment on a case-by-case basis. Our steam traps are custom-engineered for your facility, and we provide an end-to-end service to make sure you derive the full benefit from the Steam Esco Green Saver System.

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Steam Esco and Vertis Environmental Finance announced on 12 October 2015 that Vertis has made an investment into Steam Esco. Focused on emissions trading since 2001, Vertis was one of the first companies in the world to be involved in the carbon markets. Vertis will also act as sales agent for Steam Esco and will offer Steam Esco’s products to industrial clients across Europe and beyond.


Keith Moore, CEO of Steam Esco, said: “We are excited to team up with Vertis and work with their sales team to sell our products into new markets in Europe.”

“For Vertis this is a great opportunity to diversify and get back to helping our clients reduce their fossil fuel dependency and cut greenhouse gas emissions,” said James Atkins, Chairman of Vertis.

For further information, please visit Vertis.