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Neville Engineering offers expert grease interceptor sizing for restaurants, commercial kitchens, food processing facilities, and medical offices. Properly sized grease interceptors are critical for effective grease removal and compliance with plumbing codes. When determining the optimal interceptor size, we consider factors like the number of meals served, dishwasher capacity, and sink volume.
Gravity Grease Interceptor Design
For the above formulas, calculations are performed based on the following scenario. FOG is removed from dishware during cleaning and interacts with excess cleaners and sanitizers to begin saponification, the process that produces soap. Prevent clogged and blocked drains – Our traps catch grease before it coats and sticks to piping.
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Neville Engineering’s separators require minimal maintenance, ensuring longevity and reliable performance for years. We use proven systems to provide effective solutions, avoiding costly experimental designs. Identify the optimal location for the grease trap, considering flow patterns and ease of access for cleaning.
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Welcome to the webpage of McKenna John J Architect, a leading architectural firm in Miami Dade specializing in GREASE TRAP design drawings. Our team of highly skilled professionals is committed to providing exceptional services in the area of heavy industry and engineering. With our extensive experience and expertise, we can assist you in creating top-notch GREASE TRAP design drawings that adhere to all necessary regulations and specifications. Using XYZ Restaurant data along with the assumption of 75-psi water pressure, a 30-minute retention time and a 25% storage factor, the maximum flow rate is 51.69 GPM.
With over 30 years in the business, our engineering team has unrivaled expertise in grease trap design and integration. We always stay on top of plumbing codes and wastewater regulations across all jurisdictions to create compliant, high-performance solutions. One of the most reliable ways to manage FOG and prevent an SSO from occurring is to use a precast concrete gravity grease interceptor. How do we size and design this important piece of infrastructure to maximize its effectiveness? This article highlights the design principles needed to achieve this goal.
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Applying this to XYZ Restaurant, the flow rate would drop to below 20 GPM, thus requiring a 750-gallon tank. Bring your commercial or multi-family building plans to life with Neville Engineering Service, Inc. Our experienced team provides expert heating, ventilating, air conditioning, plumbing, and electrical services to perfect your building’s performance. Our grease traps incorporate green technology, such as recycled steel content and energy-efficient manufacturing methods. Do not purchase a grease interceptor without obtaining a building plan approval including an Industrial Waste approval letter specifying the size and design of the interceptor that will be required. Purchasing an interceptor prior to IW approval exposes the purchaser to risk of rejection and replacement costs.
This comprehensive guide will provide a step-by-step approach to designing grease traps, empowering you with the knowledge to create effective and compliant systems. Precast concrete GGIs not only provide greater storage capacity and longer retention times, but also offer the added benefits of structural integrity, design flexibility and a long service life. Outdoor concrete interceptors provide a level of health safety by removing this process from the food preparation environment.
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However, the short-term impact of this density upflow is minor on the effluent FOG concentration. Over time, the effluent FOG concentration will be similar to previous uniform influent/bulk temperature results. If the density of the globule is less than the density of the fluid, the globule will rise at velocity V, and vice versa. If we were to divide that globule size in half to 100 microns (.00033 feet), the globule would rise at 0.002 ft./s. Therefore, for more effective separation, larger grease globules are optimal. The right sizing helps prevent sewer line clogs, equipment damage, and fines for non-compliance.
While grease globules in hot water may be smaller in diameter, fluid also has a lower viscosity at higher temperatures. Also, large-volume precast concrete tanks act as a heat sink and are effective in reducing influent water temperature, which allows for the coalescence of smaller globules. Hot water flow into the grease interceptor containing cooler temperature wastewater can produce a temporary upflow effect due to the lower relative density of the influent stream.
Each of these factors plays a key role in the type of grease globule that enters the interceptor. Avoid fines and penalties – Proper grease traps help facilities comply with wastewater ordinances and regulations. Once the concept design is approved, we move on to creating detailed design drawings. Our team utilizes advanced software and tools to produce accurate and comprehensive drawings that guide the construction and installation of your GREASE TRAP. That's why we take a personalized approach to create custom GREASE TRAP design drawings that suit your specific needs.
As a technology-driven company, we pride ourselves on leveraging proven strategies to deliver advanced, high-efficiency grease traps. We use simple, tried-and-true solutions to drive success and promote comfort, flow, and life throughout your building. Our MEP services prioritize energy efficiency and everyday use, so you never need to think about your plumbing system. However, the white paper did not include any data from the WERF studies mentioned above. As such, until further research is conducted, there is no “right” or “wrong” formula to use.
Prevent corrosion – Grease is acidic and can eat away at plumbing and sewer infrastructure if left uncontrolled. The goal for engineered GGIs is to closely comply to the concrete GGI requirements but allow slight flexibility if site conditions are not ideal for a concrete GGI. If DFUs are not known, Table 702.2a of UPC Chapter 7 (Table 3) can be used to assign values based on the maximum DFUs allowed for the pipe size connected to the inlet of the interceptor.
One of the issues with using this formula is that while DFU is a common term for plumbers, it is uncommon for pretreatment coordinators and officials dealing with the regulation of GGIs. Also, the DFU does not differentiate between flow from a fixture and flow from a draining sink. When plumbing fixtures do not drain from filled sinks, the faucet flow is used; however, when a filled sink drains, Manning’s Equation should be used to determine the peak allowable flow. The 1980 version of the EPA formula, which is still used today, calculates the influent flow rate as 5 gallons per meal.
This process enhances the removal of FOG from utensils and dishware but reduces the size of the grease globules, lessening the ease of separation from the effluent. As a grease globule enters a grease interceptor, the globule’s size, density and temperature will impact its destination. Elevate environmental stewardship and operational efficiency through innovative oil and grease trap design.
However, these requirements also allow larger HGI models if site conditions are not ideal for a Gravity Grease Interceptor. We begin with an initial consultation where we discuss your project requirements and expectations. This helps us gain a clear understanding of your goals and enables us to propose the most appropriate design solutions. For intermittent flow into the drainage system, DFUs can be calculated based on the rated discharge capacity in GPM using Table 702.2(b) of UPC Chapter 7 (Table 4). In deciding what formula to adopt, the authority having jurisdiction should ensure the formula is clear so that the assumptions behind the flow calculations are known.
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