Knowing more about Grease Traps

17th March 2018

Known also as grease interceptor, grease separator, fat traps and fat interceptor, the grease trap is definitely at the top of the ‘useful-tool-you-should-install-on-your-plumber-system’ list. Why purchase a grease trap? How to choose a grease tap? We hope, after reading this article, you can answer some of these questions.


Reasons For Buying  A Grease Trap

It seems that all the restaurants in the streets produce a significant amount of waste fat, grease, and oil every day, but meanwhile, they seldom encounter the frustrating plumber problems such as sink choke and pipe choke. Is it because that they hire some plumber teams secretly to help with these kinds of problems? In fact, the secret of avoiding problems is thanks to our topic of today -- grease traps!

Billions of kitchens around the world throw away not only used water, wasted food, but also harmful content, such as ‘FOG’: ‘fats, oils, and grease.’ If they are not removed and cleared in time, the fats, oils, and grease will cling to the wall of the pipes and lead to the drainage system and plumber system blockages and chokes, also, back-up in sewers called sanitary sewer overflows(SSOs). SSOs may do severe harm to human health.


What Are Grease  Traps?

Grease traps have a relatively long history in the family of draining tools. People began to use them in the late 1800s, Victorian days. Nathaniel Whiting of California obtained the first patent.

Grease traps are essentially products that can restrict the flow of water and separate the food solid, FOG and water. Treated water is allowed to pass through safely and quickly. Only in the kitchen can you find the grease traps, because the design serves in kitchen draining system but no other drainage system, for example, toilets drainage system.

The traditional and modern grease traps are both in the form of boxes ranging between 35-liter capability to 45000 liters and greater. Stainless steel, concrete, plastics, and cast iron are the most common materials in making grease trap. Due to the different materials, the locations of grease traps are usually different and when the problem of clogged drains occur, it is important for the plumber to know which type of drain is in place。



How Does Grease  Trap Work?

In 200 years, the function and methodology of grease trap have hardly changed. Because the grease’s density is much smaller than water, it will naturally rise to the top of the mixture. You can find an inverted line at the outlet of the tank which only allows water out but stops the FOG from entering your plumber system.


Different Types Of  Grease Traps

We will introduce five types of mainstream grease traps to you.

Small passive Hydromechanical Grease Interceptors (HGI)

Hydromechanical grease interceptors usually are less expensive compared with other kinds of traps. Probably due to its lower price, when people mention grease traps, they are more likely to refer to HGI instead of other types.

However, HGI is a relatively more traditional type of trap, so it needs to be pumped regularly because of its design. The accumulated continuously FOG stored in the tank will reduce the tank’s working volume gradually and lower the efficiency of water and FOG separation. Furthermore, it is highly possible that some of the FOG will flow with the water into the sewer line if the HGI is not appropriately pumped. The more FOG a site produces, the higher frequency of pumping is required. Sometimes a site can reach the frequency of once per week of plumbing.


Gravity Grease Interceptors (GGI)

Same as HGI, the GGI also needs regular pumping and grease removing. Once the solid amount is above 25% of the containers, the efficiency of GGI will gradually lose. However, most of the time the GGI can help prevent 90% of the grease from entering the pipes.


Automatic  Grease/Oil Recovery Systems

If you are tired of all the maintenance brought by hydromechanical Grease Interceptors, the automatic grease removal devices or recovery units may be a suitable alternative for you. As the name tells, this type of traps has an automatic way for removing the grease from tank regularly and stores them in a container by using mechanical skimmers. It is highly efficient that about 99% grease can be removed. Although this recent development has a probably higher cost, the design and function of this type of grease trap can help you save operational fees for clearing the tank.


Maximum Retention Hydromechanical Grease Interceptors

Max retention HGI gains its popularity due to the high efficiency of separating and the traits of space-saving. If you do not have enough space for a grease trap, this may be your best choice. It can hold more grease than others in the same volume, between 70- 85% of the liquid capacity.


In some cities, restaurants are required to install the grease traps. To protect your plumbing system and everyone’s health, install traps! a Singapore plumbing company like Republic Plumbers is always here at your service.

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