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The Dual-Rated GB-50 from Schier: How to Size a Grease Interceptor

GB-50 Now Dual Rated to 75 GPM

November 17, 2022

GB-50 Now Dual Rated to 75 GPM post image

The GB-50 is now recertified to include a 75 GPM rating in addition to its existing 50 GPM rating. The 75 GPM rating for the GB-50 yields a lower capacity, making it a more likely solution for lower grease producing food service establishments.

All Schier grease interceptors are tested and certified to the ASME A112.14.3-2018 standard, which lays out a uniform method of testing to provide a certified flow rate, in gallons per minute (GPM), and maximum grease capacity. The Great Basin™ line of grease interceptors ranges in size from 10 to 1,000 liquid gallons, with ASME-certified flow rates from 20 GPM to 200 GPM. Many Schier interceptors are certified with dual flow ratings, like the GB-50. The purpose of a dual rating is to offer customers with more flow rate / grease capacity options – right sizing without choice overload.

The GB-50 at 75 GPM provides the most value to food establishments that need the high flow of 75 GPM but don’t need high capacity in a unit that can be installed indoors or outdoors. The next larger Great Basin™, the GB-75, has the 75 GPM flow rate but with a higher capacity that the customer may not need, which may not be cost effective. The GB-50, now certified to 75 GPM, answers this need in the marketplace.

Why does right-sizing your grease interceptor matter?

Right sizing is a critical component of choosing the correct grease interceptor for your application, as it helps to determine an appropriate pump-out frequency. It considers both flow rate and grease production, which are determined by bringing several other factors into the equation, like pipe size, kitchen fixtures, menu type, restaurant size, and more.

GPSM in a Nutshell

Schier uses the Grease Production Sizing Method (GPSM) to correctly size interceptors using both flow rate and grease production. This method is widely accepted nationwide, as choosing only flow rate or liquid volume to size an interceptor can result in problems associated with undersizing and oversizing. Learn more!

Grease Monkey™, the Industry’s only GPSM Sizing Application

The Grease Monkey™ sizing application guides users through all aspects of sizing, produces easy-to-read sizing calculations, and kicks out a recommended unit and pump-out frequency. It also offers a complimentary PreApproval Service in which our sizing professionals confirm local code approval for your sizing. 

Right Sizing the GB-50 in Real Life

Meet Jordan and Reese, two separate restaurant owners who used Grease Monkey™ to size their interceptor purchases. During both sizings, Grease Monkey™ determined they need a unit that is certified to at least 75 GPM. Schier has three units certified to 75 GPM: GB3, GB-50 and GB-75.

NOTE: 75 gallons per minute (GPM) is the half pipe flow (or two-minute drainage period) for a 4” drain line.

Example 1: Jordan’s Tapas Bar

Jordan needs a unit with at least 170 lbs of grease capacity. Jordan’s Tapas Bar, which serves small-plate appetizers, has no room for an indoor grease interceptor so it will have to be installed outside. Because GB3 is an indoor-only grease interceptor, the recommended interceptor would be indoor/outdoor unit GB-50.

Example 2: Reese’s Sandwich Shop

Reese needs a unit with around 290 lbs of grease capacity for inside her sandwich shop. Looking at the maximum grease capacities of these 75 GPM units alone, you might think she has to go with the GB-75. However, she could go with the smaller (and more cost effective) GB-50 and pump slightly more frequently than the recommended 90-day pump-out frequency.

In Summary

Grease interceptors are not a one-size-fits-all solution. Using Grease Monkey™ to correctly size your interceptor will give you peace of mind that you’ve made the right and responsible choice. It can also save you money both up front on installation and annually by reducing maintenance costs.



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