Grease Interceptor Sizing

A correctly sized grease interceptor reduces maintenance costs for restaurants and prevents the chance of a messy and costly overflow. When it comes to sizing grease interceptors, many plumbing codes focus on either flow rate or liquid volume. Schier considers both flow rate and grease production to determine the capacity of the interceptor and its recommended pump out frequency.

Grease Production Sizing

First introduced by Schier in 2012, Grease Production Sizing calculates how much grease a restaurant is likely to produce to ensure the grease interceptor has enough capacity to allow for a realistic and affordable pumpout frequency.

Grease Production Sizing has been used to size over 50,000 restaurant grease interceptors, has been adopted by several municipalities, published in the 2016 edition of ASPE’s Plumbing Engineering Design Handbook and now powers our Grease Monkey sizing service.


Step 1: Size by Flow Rate

chart for sizing a grease interceptor by flow rate using Grease Production Sizing

Step 2: Select Grease Capacity for Pumpout Frequency

chart for sizing a grease interceptor by grease capacity using The Grease Production Sizing Method

Foodservice Establishment (FSE) Grease Production Values

chart for categorizing grease production values of FSEs using Grease Production Sizing

Please note that Grease Production Sizing may not satisfy local jurisdictional requirements for installation approval and should always be verified prior to selection. The easiest way to verify sizing for any project is to use our Grease Monkey sizing service and select the "Pre-approve" option.

GREASE MONKEY Grease Interceptor Sizing Service

Grease Monkey guides you through the important aspects of sizing and produces a plans-ready sizing report using Grease Production Sizing. Once you receive your recommended interceptor, you can opt-in to our complimentary Pre-approval Service in which our sizing experts double-check your work and confirm local code approval for your grease interceptor installation.

Key Features and Functionality:

  • Easy-to-use interface that recommends the right sized grease interceptor
  • Gives users the ability to save and modify previous sizings
  • Produces PDF plan-ready sizing calculations, perfectly sized for placement on your construction documents
  • Accommodates local jurisdictional requirements including Illinois, Wisconsin and Oregon...with more to come.
  • Pre-approval Service backed by Schier’s sizing experts…all for free!

 Grease Monkey is a trademark of Schier Products Company

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