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NYC DEP Code Compliance for Grease Interceptors



Acceptance

In its 2010 publication Best Management Practices (BMP’s) for Non-Residential Direct and Indirect Dischargers of Grease into the Public Sewer System (15 RCNY Section 19-11), the NYC Department of Environmental Protection (NYC-DEP), in cooperation with Department of Buildings, requires grease interceptors to be certified to ASME A112.14.3 or PDI G101 and sized by flow rate and grease capacity. Schier’s Great Basin line of grease interceptors are certified to ASME A112.14.3 and, therefore, accepted for installation in New York City.


Effective May 2016, NYC-DEP has accepted Schier’s GBHF-250-200, which has a factory-rating of 200 GPM with 400 pounds grease storage capacity. In some cases, sizing per 15 RCNY Section 19-11(c) guidelines will require a unit with a flow rate higher than 100 GPM, and while the NYC-DEP requires compliance with either ASME A112.14.3 or PDI G101, there are no grease interceptors certified to ether standard with flow rates over 100 GPM. NYC-DEP does accept grease interceptors that have flow rates higher than 100 GPM from manufacturers who have PDI or ASME accepted grease interceptors with flow rates less than or equal to 100 GPM. The accepted devices with higher flow rates must use the same engineering principles as the lower flow rate devices and must be proportionately larger than the smaller PDI or ASME approved devices.


Sizing

From Title a5 RCNY Section 19-11, the minimum size grease interceptor is determined by aggregate volume, which is the maximum volume in cubic inches of all fixtures, vessels and receptacles that may flow simultaneously through the interceptor. Depending on what fixtures are being used, sizing will be based on Table I, Table II or a combination of both."


NYC-DEP configured table I and table II by using grease pounds to determine the size of grease interceptor, but always intended that the flow rate of the interceptor was to be one-half of the grease pounds listed. The NYC-DEP has clarified the policy and will not allow a grease interceptor to be sized based solely on its grease storage capacity if the interceptors actual flow rate would be less than that indicated by taking the grease pounds from Table I or Table II and dividing by two. For example, 20,000 cubic inches of aggregate volume in Table I would require 70 lbs. capacity or a 35 GPM flow rate. While Schier’s GB1 can hold 70 lbs. of grease its flow rate would only be 20 GPM and would therefore be incorrectly sized according to NYC-DEP requirements. The proper size interceptor would be a Schier GB2, which may be used at a flow rate of 35 GPM with a grease capacity of 130.5 lbs. Excess grease storage capacity is accepted by the NYC-DEP but not a lower flow rate.


The table below shows the alteration from Lbs. to GPM with the right recommended Great Basin Model:




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