Planning a KESSEL EasyClean grease separator
The grease separators from KESSEL’s EasyClean range are used in a variety of sectors: from the catering industry through to the meat, oil and fat processing industries. The most suitable model and version must be determined by calculation based on the specific characteristics of the individual premises.
Please note that these planning tips are for information purposes only. For the actual design of an EasyClean grease separator, please use the KESSEL sizing sheet or the SmartSelect online design tool.
Step 1: Determine the basic data
Start by gathering some basic information about the site. This will serve as the starting point for the rest of the planning.
Type of business
A distinction is generally made between the following sectors:
- Catering establishments
- Meat industry
- Oil and fat processing industry
Opening hours
How long, how often and in what way is the grease separator operated?
- Hours of operation per day
- Operating days per week
- Continuous or batch operation
Valid limit values
What are the maximum limits specified by the drainage authority and/or the drainage regulations?
- Wastewater temperature in °C
- pH value
- Concentration of lipophilic substances in mg/l
Step 2: Identify influencing factors
When planning a grease separator, in addition to the maximum waste water flow rate, you must also take into account the so-called influencing factors. These are determined by the density of the grease entering the separator, the temperature of the waste water, and the possible use of detergents and cleaning agents. Tip: Dishwashers discharge at temperatures below 50 °C, which corresponds to a factor of 1. For a cooking kettle, you should select a factor of 1.3.
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Density factor fd
depending on the density of the fat at 20 °C
- Up to 0.94 g/cm³: factor 1.0
- From 0.94 g/cm³: factor 1.5
Temperature factor ft
depending on the temperature of the wastewater at the inlet
- Up to 60 °C: factor 1.0
- From 60 °C: factor 1.3
Difficulty factor fr
depending on the use of washing-up liquid and cleaning products
- Without detergent and cleaning agents: factor 1.0
- With detergents and cleaning agents: factor 1.3
Step 3: Calculate the nominal size
Once you have the figures for the maximum waste water flow rate and the influencing factors, you can calculate the required nominal size NS of the grease separator.
The DIN EN 1825-2 standard specifies the following formula for calculating the nominal size NS:
NS = Qs x fd x ft x fr
Step 4: Calculate the sludge retention volume
Using the nominal size NS determined in the previous step, you can now calculate the sludge trap volume in litres:
- For businesses with increased sludge production, such as butchers with their own slaughtering facilities, the sludge trap volume corresponds to the nominal size multiplied by 200 litres (example calculation: 7 x 200 = 1,400 litres).
- For all other businesses, the sludge trap volume corresponds to the nominal size multiplied by 100 litres (example calculation: 2 x 100 = 200 litres).
Would you like to start designing your separator straight away? Then use our design sheet or the SmartSelect digital planning tool.
