[플랜트교육] Reducer Type (Concentric VS Eccentric) 큰 차이점~!!!, 실전꿀팁 Flow Direction, Top Flat, Bottom Flat

When are Eccentric and Concentric Reducers Used
Concentric reducers are used where the pipework is vertically installed and at the discharge side of pumps.

Eccentric reducers are more often used when the pipework lays on a pipe rack. Because of the flat side, aligning and securely mounting the pipes to the rack is easier. Those reducers also come in handy where there is a pump installed in liquid transporting systems. To avoid cavitation, the pipework is connected to the pump via an eccentric reducer that has its flat side facing up. This prevents the forming of bubbles and limits the chance of damaging the propellers inside the pump because of the cavitation phenomenon.

In ducting, we are often transporting heated or cold air and the cavitation phenomenon is not present. Therefore in this industry concentric reducers are used the most, with all of the concentric reducer dimensions.

How are Reducers Made
Concentric reducers used in ducting and ventilation systems are most commonly made from galvanised steel.

Those fittings can also be made out of stainless steel – 304, 316 and 316L. This makes them resistant to corrosion and they can handle weather conditions well. Also, this allows them to be used for transporting corrosive materials like water, steam and air.

The inner and outer surfaces of reducers used in plumbing are well polished with high-grade materials in order to meet the requirements for food, pharmaceutical and other industries.

Installing Eccentric and Concentric Reducers
There are various different ways to install reducers. Which way you choose will vary on the duct work you are changing the size of and what is travelling through the ducting.

Duct sealant
Self-drill screws
Duct tape
via hose clamps;
welding;
threaded.
Much like with the installation of spiral ducting which we covered in one of our earlier blog posts, standard galvanised steel concentric reducers have male spigots which will slip inside spiral duct. A female connection piece will be required if you are joining two male end fittings. Reducers can be fixed using duct sealant, self-drilling screws and/or duct tape.

When using flexible ducting, an often used method of fixing those fittings is using hose clamps, often known as Jubilee clips. These accessories provide a strong grip and firm connection when tightened well around the rigid reducer.

If you are welding reducers in place, you need to make sure you have removed any oils and other contaminants from all surfaces to get a strong weld. Use a cloth with some alcohol to rub all pollutants off the reducer and the pipe.

Threaded reducers, obviously have threaded ends and screw fixed to the pipes. These types of reducers are most commonly used in the plumbing industry and require the pipes to be threaded as well. The perk of this type of connection is that it is flexible, meaning you can shift the angle where the pipe is going when using an eccentric reducer.

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