Engineering Fact Sheet
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1 GREASE INTERCEPTORS Service Alert Sensors Cast Iron Access Hatchway General Information Sewers back up an estimated 400,000 times each year in the United States causing approximately 40,000 municipal sanitary system overflows (SSO). The EPA has determined that sewer pipe blockages are the leading cause of SSO s and grease is the primary cause of sewer blockages. Grease interceptors are devices designed to reduce the amount of FOG (Fats, Oil and Greases) in wastewater. MODEL GTF Outlet Double Tee Manifold Inlet Grease interceptors are used in establishments to remove excessive amounts of grease that may interfere with the proper drainage and treatment of wastewater. Even if accumulated FOG does not escalate into blockages and SSO s, it will disrupt wastewater treatment operations and increase costs. Most Local plumbing codes prohibit any industrial user from discharging FOG over 100 (mg/l) into the public sewer system. The general doctrine, of most Authorities Having Jurisdiction (AHJs), is one of user pay, especially when it comes to solid waste. Therefore, it makes sense for establishments that create FOG to be responsible for its collection and disposal. Otherwise, the burden is on the municipality and ultimately the taxpayer to pay for sewer blockages and grease overloads at sewer treatment plants. It is prudent for the consultant engineer to utilize a Best Management Practice (BMP) that includes adequate sizing for the grease interceptor. Typical applications include commercial and institutional kitchens and food processing plants. The waste discharge from these facilities usually contains high temperature water, high organic loads, FOG, suspended food particles, and detergents. New plumbing codes have eliminated the term grease trap from the code and now designated Hydromechanical Grease interceptor and Gravity Grease interceptor as the two types of grease interceptors. Park sells both units, but Gravity Grease interceptors are by far the design of choice by engineers and city officials. Hydromechanical Grease Interceptors incorporate air entrapment, the buoyancy of grease in the water and hydromechanical separations with interior baffling for FOG separation. Hydromechanical units incorporate a flow-control device that controls velocity as it enters the interceptor. These are typically smaller interceptors installed indoors in the floor or under-the-sink. Hydromechanical grease interceptors require cleaning every 2-4 days and are typically cleaned by kitchen personnel. City health departments have concerns regarding proper cleanout and accurate documentation of maintenance. Many major cities have prohibited the installation of hydromechanical interceptors within food preparation areas without special variances. Hydromechanical units are sized by determining flow-through rate (gpm) at peak demand for each fixture draining into the unit. Check with the local AHJ before specifying Hydromechanical units to determine if the jurisdiction allows these type units. Gravity Grease Interceptors incorporate two or more compartments in series and use its inherent larger volume to maximize the pretreatment of the wastewater. By comparison, the Gravity Interceptor is more effective because of its larger volume that acts as a heat-sink. This allows for temperature differential (cool down) and more retention time of the greasy liquid to promote separation and coagulation of FOGs from the wastewater. Model Number MODEL GT CROSS SECTION Capacity Gal Grease Trooper Performance Schedule Flow Rate GPM Average (1) Intermittent (2) Max Grease Capacity Gal Max Solids Capacity Gal Dimensions Inches Empty Wt. lbs. (3) GT x52x54 9,500 GT x52x72 9,900 GT , x60x72 13,350 GT , x68x72 14,650 GT , x68x84 16,050 GT , , x72x96 21,250 GT , , x84x84 27,050 GT , ,650 1, x84x96 33,150 GT , x84x102 38,590 GT , x102x84 38,100 GT , x102x96 41,550 GT , x102x108 44,700 GT , x108x120 59,908 GT , x108x130 65,018 GT , x108x115 69,116 GT , x135x104 85,760 GT , x135x114 89,950 GT , x135x120 93,280 GT , x135x126 97,960 GT , x135x ,040 GT , x135x , Recommended for 100 mg/l (ppm) effluent concentration of grease (most plumbing codes) 2. Maximum intermittant flow rate 3. Precast concrete model The Gravity Interceptor also allows for solids retention from food grinders. Gravity grease interceptors are generally located outdoors away from the kitchen areas. This eliminates the health department concerns regarding maintenance and disposal of FOGs. EFSEFS-GT-WW 1
2 Recent findings by EPA of SSOs in cities and accompanying fines have caused states and municipalities to require haulers of grease to be registered. Owners are required to maintain documentation of pump-out for review by the health department. Maintenance One of the most important features for the successful operation of the grease interceptor is the maintenance program. Regardless of the size or design, an interceptor is only as good as its maintenance program. The interceptor should be located so that it will be easily accessible for inspection, cleaning and removal of collected FOG. The interceptor should be located near the source of the wastewater for the protection of the piping system. There should be an adequate number of access manholes to permit access for cleaning all areas of the interceptor. Access manholes should be located near the inlet and the outlet. The manholes should not be less than 20 in size. All manholes should extend to grade and be suitable for traffic loading for indoor and sensitive areas. The grease interceptor should be cleaned (or pumped out) routinely to insure grease detention performance. Cleaning should be performed when the interceptor is at 75% of grease retention. The frequency of cleaning at any given installation will vary depending on use. Pumping frequencies for restaurants range from 30 to 90 days. Most AHJs have minimum requirements for pump out and require pump out manifest records be maintained for review by local health departments. Typically, pump out companies are required to be registered with the state s water quality agency. Types of Grease Interceptors Fig. 4 - Typical Precast Concrete GreasTrooper Gravity Grease Interceptors manufactured by ParkUSA are available in several styles depending on the application. Gravity Grease Interceptors Application Matrix GT Model GT Grease Interceptor Style Precast Concrete GTS Stainless Steel GTF Fiberglass Applications Advantages Buried Below Grade Outdoors Free Standing, Indoors or Outdoors Buried or Free Standing in Hard to Reach Areas, Outdoors or Indoors Strength, Lowest Priced Strength, Moderately Priced Convenient Lightweight design Fig. 4 - Typical Stainless Steel GreasTrooper Typically, the ParkUSA GT Series Interceptor is the most economic and preferred choice over all other interceptor types. The Park GT Series Interceptor is manufactured of Class II 4500 PSI precast concrete offering superior structural strength and longevity. As an option, the interceptor can be equipped with a variety of interior chemical proof liners including PVC. The ParkUSA GTS Series Interceptor is a stainless steel unit and is recommended for applications where the grease interceptor is installed in a freestanding position, i.e., in a basement or on a slab. The ParkUSA GTF Series Interceptor is manufactured from fiberglass reinforced polyester (FRP) material and is corrosion resistant and lightweight for above or below ground installations. Fig. 4 - Typical Composite GreasTrooper 2016 EFS-GT-WW EFS Edition 2
3 Grease Interceptor Sizing Gravity Grease Interceptors are recommended to be sized utilizing Best Management Practices (BMP). The commonly used BMP sizing methods are the Seating Method and the Drainage Fixture Unit Method (2012 UPC). All methods are based on sizing according to local plumbing codes and on years of field performance testing with methods utilizing the relationship of the probable flow rate and retention time to estimate the grease interceptor size. Seating Method: The different variables include number of seats or beds, gallons of wastewater per meal, storage capacity factor, number of hours open and loading factor. Where: D MF GO RT ST and (D) x (MF) x (GL) x (RT) x (ST) = Size of Grease Interceptor (gallons) = Total Number of Seats in Dining Area = Meal Factor, based on establishment type & average time per meal: 1.33 Fast Food / Cafeteria (45min) 1.00 Restaurant (60min) 0.67 Fine Dining (90 min) 0.50 Banquet Hall & Commissaries (120 min) School Cafeteria* (120 min) *(lunches served over 120 min & 25% absentee/sack lunch factor rate) = Gallons of wastewater per meal: 6 with dishwashing machine 5 without dishwashing machine 2 single service kitchen** 1 food waste disposal = Retention Time: 2.5 commercial kitchen waste 1.5 single service kitchen =, based on hours of operation: 1.0 operation of 8 hours 1.5 operation of 12 hours 2.0 operation of 16 hours 3.0 operation of 24 hours 1.5 single service kitchen** ** Single service kitchen: meals are served as take out or on disposable plates utensils; facility clean-up is the only dishwashing involved. Example #1: A well known Seafood Restaurant is being designed with a seating capacity of 130 people, a full service kitchen, and an 8 hour operation schedule: (D) x (MF) x (GO) x (RT) x (ST)= Size of Grease Interceptor (gal) 130 x 1.00 x 5 x 2.5 x 1.0 = 1625 gallons A 2,000 Gallon interceptor is selected Example #2: A popular Fast Food Restaurant is being designed with a seating capacity of 50 people, a single service kitchen, and a 24 hour operation schedule: (D) x (MF) x (GO) x (RT) x (ST)= Size of Grease Interceptor (gal) 50 x 1.33 x 2 x 1.5 x 3.0 = gallons A 750 Gallon Interceptor is selected Drainage Fixture Unit Method: The DFU method of sizing typically results in a smaller grease interceptor than is recommended by ParkUSA but conforms to the latest 2012 Uniform Plumbing Code. The use of this method of sizing may result in a system that requires continuous maintenance and/or will clog facility piping and municipal sanitary systems. Per UPC handbook definitions, a Fixture Unit is a quantity in terms of which the load-producing effects on the plumbing system of different kinds of plumbing fixtures are expressed on some arbitrarily chosen scale. Fixture Unit Pipe Size DFUs 1-1/4 inch 32 mm 1 unit 1-1/2 inch 40 mm 3 unit 2 inch 50 mm 4 unit 3 inch 80 mm 6 unit 4 inch 100 mm 8 unit Gravity Grease Interceptor Sizing The first step is to quantify all the fixtures that could receive kitchen-type waste. It is important to note that only the fixtures that receive kitchen related waste are tabulated (not toilets, urinals, etc...) As published in IPC Table or UPC Table 7-3, DFU s are tabulated for all the plumbing fixtures. The following table from UPC Section 702.0, Fixture Unit Equivalents, covers fixtures and devices not shown in Table 7-3 and is more applicable to commercial establishments. Example: An Industrial Food Processing Plant has the following fixtures: Six floor drains, Three hand sinks, Two 3-compartment sinks, Four 2-compartment sinks A pot sink A 20 gpm dishwasher discharging into a dedicated receptor A mop sink. The fixtures are tabulated as follows: Fixtures DFU s 6 4 Floor 2 DFU s each = 12 3 Hand Sinks 2 DFU s each = Comp Service Sinks 4 DFU s each = Comp Service Sinks 2 DFU s each = 8 1 Pot Sinks 4 DFU s each = 4 1 Dishwasher 4 DFU s each = 4 1 Mop Sinks 2 DFU ea = 2 Total = 44 DFU s Interceptor Volume (2) gallons 21 (3) 750 gallons 35 1,000 gallons 90 (3) 1,250 gallons 172 1,500 gallons 216 2,000 gallons 307 (3) 2,500 gallons 342 3,000 gallons 428 4,000 gallons 576 5,000 gallons 720 7,500 gallons ,000 gallons ,000 gallons 1. The maximum allowable DFU s plumbed to the kitchen drain lines that will be connected to the grease interceptor 2. This size is based on: the DFU s, the pipe size from this code; Table 7-5; Useful Tables for flow in half-full pipes (ref: Mohinder Nayyar Piping Handbook, 3rd Edition, 1992) 3. Based on 30-minute retention time (ref.: Metcalf & Eddy, Inc. Small and Decentralized Wastewater Management Systems, 3rd Edition Ed. 1998). Rounded up to nominal interceptor volume A total of 44 DFU s are calculated. From the table provided above, a 1,250 gallon grease interceptor is selected. Worksheets: Attached are two worksheets presented as typical examples of tools ParkUSA offers to help with sizing. The first worksheet addresses the DFU method and second worksheet presents the Seating/Meals method. Please contact ParkUSA ( ) (info@park-usa.com) for electronic copies of the sizing worksheets or to request assistance with specific projects. EFSEFS-GT-WW 3
4 Grease Interceptor Sizing Worksheet Project: Sample Seating Method Calculated By: Date: Address: Anywhere USA Company: ParkUSA Ref. No: Expert ver 1.0 Seat/Meals BMP-IPC Background: International Plumbing Code (IPC) does not specify a sizing method for Gravity Grease Interceptors. This allows the design engineer to utilize a Best Management Practice (BMP) for a job-specific plan. The most widely used sizing method for gravity interceptors is the Seating or Meals Sizing Method. The system is based on years of field performance testing with methods utilizing the relationship of probable flow rate and retention time to estimate sizing for a particular project. Instructions: Follow the steps to determine grease interceptor size. Note: All User Input Information is in RED Number of Meals Per Peak Hours Waste Flow Rate Retention Time Interceptor Size (calculated) 298 X 5 X 1.5 X 1.5 = 3,354 Step #1 Step #2 Step #3 Step #4 Step #5 Recommended Minimum Size Grease Interceptor Based on Park Environmental Model or Equal GT Step # Number of Meals Per Peak Hour Recommended Formula: Seating Capacity or Number of Persons X Meal Factor = Number of Meals Per Peak Hour 445 X 0.67 = 298 Enter Seating Capacity Establishment Type Min Per Meal Meal Factor Fast Food Restaurant Leisure Dining Cafeteria / Hospital Church / Assembly Hall Waste Flow Rate Condition: Flow Rate a. With a Dishwashing Machine 6 Gallon Flow b. Without Dishwashing Machine 5 Gallon Flow c. Single Service Kitchen 2 Gallon Flow d. Food Waste Disposer Only 1 Gallon Flow Retention Time Commercial Kitchen Waste Dishwasher 2.5 Hours Single Service Kitchen Single Serving 1.5 Hours Kitchen Type a. Fully Equipped Commercial Kitchen Hours of Operation 4 Hours Hours 1 12 Hours Hours 2 24 Hours 3 b. Single Service Kitchen 1.5 Calculate Liquid Capacity Multiply the values obtained from step #1, #2, #3, and #4. The result is the approximate grease interceptor for this application Select Grease Interceptor Using the approximate required liquid capacity from step #5, select an appropriate size as recommended by the manufacturer. Disclaimer: This program is designed for the easy selection of grease Interceptors. Check with the local plumbing authority for specific requirements. No warranty, either expressed or implied, is given with respect to the accuracy or sufficiency of the information provided hereby, and the user must assume all risks and responsibility in connection with the use therefore. Please contact Park if any errors are found in this worksheet. Published by Park Environmental Equipment Tel PARK Seat EFS Example standard Seating EFSEFS-GT-WW 4
5 Gravity Grease Interceptor Sizing Worksheet Project: Location: Engineer (or Name): Firm: Date: Sample Drainage Fixture Unit (DFUs) - Typical BBQ Restaurant Anywhere USA utilizing UPC (always check city amendments) Engineer designing to 2006, 2009 or 2012 IAPMO, UPC, Plumbing Codes Expert- ver 1.1 UPC-2012 Trap Arm Other Factors Fixture Type Fixture Units FU Quantity Extended Size (if applicable) 3-Compartment Sink - 1.5" arm 1-1/2" Compartment Sink - 2" arm 2" Compartment Sink - 1.5" arm 1-1/2" Dishwasher 2" Mop Sink 1-1/2" Mop Sink 2" Mop Sink 3" Pot Sink (pre-rinse sink) 1-1/2"" Pot Sink (pre-rinse sink) 2" Hand Sink 1-1/4" Hand Sink 1-1/2" Floor Drain - 2" 2" Floor Drain - 3" 3" Floor Sink (Drain) - 2" 2" Floor Sink (Drain) - 3" 3" Trench Drain 4' Other 0 0 Other 0 0 GreaseTrooper Size (see Chart Below) Total Fixture Units 110 GT City of Houston Gravity Grease Interceptor Sizing (2009 UPC) DFUs (1, 3) Interceptor Volume (2) Park Model gallons GT gallons GT ,000 gallons GT ,250 gallons GT ,500 gallons GT ,000 gallons GT ,500 gallons GT ,000 gallons GT ,000 gallons GT ,000 gallons GT ,500 gallons GT ,000 gallons GT ,000 gallons GT The maximum allowable DFUs plumbed to the kitchen drain lines that will be connected to the grease interceptor. 2. This size is based on: the DFUs the pipe size from this code; Table 7-5; Useful Tables for flow in half-full pipes (ref: Mohinder Nayyar Piping Handbook, 3rd Edition, 1992). Based on 30-minute retention time (ref.: George Tchobanoglous and Metcalf & Eddy. Wastewater Engineering Treatment, Disposal and Reuse, 3rd Ed & Ronald Crites and George Tchobanoglous. Small and Decentralized Wastewater Management Systems, 1998). Rounded up to nominal interceptor volume. 3. When the flow rate of directly connected fixture(s) or applicance(s) have no assigned DFU values, the additional grease interceptor volume shall be based on the known flow rate (gpm) multiplied by 30 minutes. 4. Contact ParkUSA for grease interceptor dimensional and installation PARK Published by Park Environmental Equipment Tel PARK Toll Free EFSEFS-GT-WW 5
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