© Schier Products Company 2013 Demystifying … · Grease interceptors shall comply with the...

Demystifying

Grease Interceptors; the facts and myths!

9500 Woodend Road Edwardsville, KS 66111

1-800-827-7119 www.schierproducts.com

Presented by: Ken Loucks

Regulatory Compliance Manager

Schier Products Company

© Schier Products Company 2013

What’s the problem?

Jurisdictions are overwhelmed with

Fats, Oils and Grease!


What’s the solution?


For nearly 130 years, grease interceptors have been used in plumbing systems to prevent the free flow of fats, oils and grease from entering collection systems where they accumulate causing clogs and back-ups.

Plumbing Codes


Many jurisdictions rely on Model Plumbing Codes to provide adequate solutions for FOG abatement.


Plumbing Codes adopt standards that govern

the equipment in plumbing systems.

Today there are 3 recognized standards for grease interceptors: PDI G101 (1949) ASME A112.14.3 (2000) CSA B481 (2007)

- Who wrote it? - When was it written? - What are its basic requirements?


A brief history of grease interceptor standards

PDI G101



In late 1940 and early 1941, prior to the United States' entry into World War II, grease interceptors were specified for Army posts to meet specifications of the Construction Division, Office of the Quartermaster General. These specifications called for interceptors which proved inadequate; thus it immediately became apparent that a comprehensive engineering and testing program was required in order to properly rate grease interceptors.

PDI G101



As a result, a series of conferences involving the Research Committee of the Plumbing and Drainage Manufacturer's Association (now Plumbing and Drainage Institute), representatives of the Quartermaster General, Surgeon General, Army Corps of Engineers, and others were held to develop a testing program to establish flow rates and grease holding capacity for uniform rating of grease interceptors manufactured at that time. The program that emerged from these conferences included exhaustive laboratory testing of each grease interceptor at the Iowa Institute of Hydraulic Research at the State University.

PDI G101



Using the guidelines established in Iowa, the Research Committee continued the testing program at The United States Testing Company, Inc., which culminated with the first issue of this standard in 1949 and certification of applicable grease interceptors.


January 21, 1944 – A symposium of 4 papers was presented at the 16th annual Meeting of the New York State Sewage Works Association. This paper by F.M. Dawson and A. A. Kalinske explains the testing and rating guidelines for grease interceptors developed at the Iowa Institute of Hydraulic Research in the early 1940’s.

History of grease traps

First researchers defined the Design Principles as:


Gravity-differential separation (that liquid greases and fats separate from the waste water in the interceptor, when the velocity of flow is reduced, owing to the difference in specific gravity) Inlet velocity should be less than 0.8 – 0.10 ft. sec. (or ½ that for interceptors that have baffles) Interceptor efficiency should not drop below 90% at its grease-retaining capacity Grease-retaining capacity should be at least twice the rate-of-flow rating in gpm.


IIHR Sizing Table established


“The determining item so far as grease interceptor size is concerned is the rate of flow from the fixture or fixtures to which the interceptor is connected.”



IIHR Test Apparatus Testing procedure: • Interceptor is filled with 150o F water • During discharge from supply tank, pure pork lard is added at a concentration of 1 lb for 5 gallons of water (through the mixing funnel) • The water and lard are also at a temperature of 150o F • A run consists of discharging, at a selected rate of flow, the hot water and grease mixture at a number of two-minute periods. • After each two-minute period the grease leaving the interceptor is collected, dewatered, and weighed to determine efficiency



Testing of a grease interceptor amounted to trial and error to discover the maximum flow rate the interceptor could be rated at based on having a 90% average efficiency and holding at least twice as much grease as the flow rate in g.p.m

Testing procedure (continued): • The foregoing value of efficiency is plotted against total grease in the interceptor (see fig. 2) • The discharging of the mixture of water and grease in two-minute periods is continued until the grease-retaining efficiency of the interceptor drops appreciably.



PDI G101 design requirements:



There are now two certification options – • Maximum Grease Capacity – The test failure, or breakdown point of the interceptor, shall be established at the increment preceding 2 successive increments in which either the average efficiency is less than 90%, or the incremental efficiency is less than 80%. • Rated Grease Capacity – The grease shall be removed from the skimming tank and the efficiency of the interceptor shall be computed at the 13th increment. This provides at least a 12.5% safety factor on the ratio of the rated grease retention capacity to flow rate.

PDI-G101 Test Apparatus Differences in Testing Procedure: • Temperature range for the test media and water is now a range between 150o F and 160o F • The total proportion of lard to water is now 1 lb lard for 10 gallons of water



The Plumbing and Drainage Institute lists the following manufacturers as meeting their standard PDI-G101 (http://www.pdionline.org/certified-grease-interceptors/):

Manufacturer Highest Certified Flow Rate Manufacturer

Highest Certified Flow Rate

AB Restaurant Equipment 15 gpm/30 lbs L&J Restaurant Manufacturing 50 gpm/100 lbs Ashland Polytrap, largest 50 gpm/100 lbs Mifab 35 gpm/70 lbs Bio-Microbics Inc. 50 gpm/100 lbs Prima Supply/Atlantic Metalworks 50 gpm/100 lbs BK Resources 50 gpm/100 lbs Rockford Separators 50 gpm/100 lbs Canplas 50 gpm/100 lbs Thermaco Inc. 35 gpm/70 lbs Green Turtle 100 gpm/200 lbs Town & Country Plastics 25 gpm/50 lbs Highland Tank 50 gpm/100 lbs Triton Metals 20 gpm/40 lbs Jay R. Smith 75 gpm/150 lbs Wade Specification Drainage 35 gpm/70 lbs John Boos & Company 50 gpm/100 lbs Wentworth Company 25 gpm/50 lbs Josam 50 gpm/100 lbs Watts Water Technologies 50 gpm/100 lbs Klingers Trading inc. 50 gpm/100 lbs Zurn Industries 100 gpm/200 lbs



The current version of the standard reads: ASME A112.14.3(R2004) date in parenthesis indicates the year the standard was reviewed by committee and “reaffirmed”.

ASME A112.14.3 -2000 indicates the year it was published.

The standard is currently being updated and should be available in 2015.



ASME A112.14.3 – What are the basic requirements?

PDI G101 type interceptors are Type A units in this standard. Notice that this standard goes further than PDI G101 in that it allows for multiple configurations, namely Types B, C, and D, which are not PDI G101 approved designs.




Schier Products Great Basin series grease interceptors are certified by NSF International to ASME A112.14.3 Type C.




Rated Grease Capacity – The grease shall be removed from the skimming tank and the efficiency of the interceptor shall be computed at the 13th increment. This provides at least a 12.5% safety factor on the ratio of the rated grease retention capacity to flow rate.

There are now two certification options: Maximum Grease Capacity – The test failure, or breakdown point of the interceptor, shall be established at the increment preceding 2 successive increments in which either the average efficiency is less than 90%, or the incremental efficiency is less than 80%.

Hydromechanical grease interceptor standards focus on

minimum retention capacities

Flow Rate Grease Retention Efficiency

Schier model #

PDI/ASME requirement

Schier certified to

PDI/ASME requirement

Schier certified to

GB-15 15 gpm 30 lbs 72 lbs 90% 97.7%

GB-20 20 gpm 40 lbs 109 lbs 90% 97.3%

GB-25 25 gpm 50 lbs 71 lbs 90% 92.8%

GB-35 35 gpm 70 lbs 142 lbs 90% 92.4%

GB-50 50 gpm 100 lbs 249 lbs 90% 92.2%

GB-75 75 gpm 150 lbs 616 lbs 90% 93.2%

GB-250 100 gpm 200 lbs 1076 lbs 90% 92.2%

Best in Class

Best in Class



IAPMO lists the following manufacturers as meeting ASME A112.14.3 (pld.iapmo.org):

Manufacturer Highest Certified Flow Rate Manufacturer

Highest Certified Flow Rate

Rockford Separators 100 gpm/200 lbs Josam 50 gpm/100 lbs Bio-Microbics Inc. 50 gpm/100 lbs Highland Tank 50 gpm/100 lbs J.R. Smith 100 gpm/200 lbs Schier Products 100 gpm/1076 lbs Mifab 35 gpm/70 lbs Thermaco Inc. 75 gpm/150 lbs Watts Drainage Products 50 gpm/100 lbs Watts Industries Canada 50 gpm/100 lbs Zurn Industries 50 gpm/100 lbs BK Resources 50 gpm/100 lbs Canplas 50 gpm/100 lbs Green Turtle 100 gpm/200 lbs


CSA Group both writes standards and offers testing and certification to

those standards for a fee.

A very expensive fee!

Fortunately, they also certify other agencies to test to their standards.


CSA B481


Mark identifies an interceptor that has been tested and rated by IAPMO to

CSA B481

Mark identifies an interceptor that has been tested and rated by CSA Group to

CSA B481



B481.1 Testing and rating of grease interceptors using lard B481.2 Testing and rating of grease interceptors using oil

The standard offer’s two different options for testing and rating as follows:


CSA B481


B481.1 key elements:

General requirements Grease interceptors shall comply with the requirements specified in CSA B481.0 Test method Grease interceptors shall be tested and rated in accordance with ASME A112.14.3


CSA B481


B481.2 key elements:

General requirements Grease interceptors shall comply with the requirements specified in CSA B481.0 Test method • Uses room temperature water 23 ± 2 oC • Uses slightly cooler oil with specific gravity of 0.92 ± 0.01 at 20 oC • Uses solids, crushed granite between 9.5 and 19 mm (unless the interceptor is not designed to capture and contain solids). • Oil is to be injected at a steady rate of 12,000 mg per liter of water • 3 grab samples are taken during each test cycle • A procedure for determining the efficiency of the interceptor is provided • Interceptors label must list the grease removal efficiency and effluent grease concentration


CSA B481


CSA Group lists the following manufacturers as meeting CSA B481 (www.csagroup.org):

Manufacturer Highest Certified Flow Rate

Canplas 50 gpm/100 lbs Capteurs G.R. Inc. 50 gpm/100 lbs Green Turtle Technologies 100 gpm/200 lbs

IAPMO lists the following manufacturers as meeting CSA B481(pld.iapmo.org):

Manufacturer Highest Certified Flow Rate

Schier Products 100 gpm/1076 lbs Watts Industries Canada 50 gpm/100 lbs Goslyn 25 gpm/50 lbs


In the absence of a bylaw or municipal ordinance we look to plumbing or building codes, or approved standards for grease interceptor sizing guidelines.

The 2010 NPCC does not provide sizing for grease

interceptors – it does reference ASPE Plumbing Engineering Design Handbook 4 Plumbing Components and Equipment , chapter 8 Grease Interceptors – in Appendix A (non-mandatory)

Sizing grease interceptors


The ASPE handbook, PDI G101, ASME A112.14.3, and CSA B481 ALL offer the same volumetric fixture sizing guidelines, except that PDI G101 also provides a table for sizing based on pipe diameter. All of the sizing guidelines offer a one-minute or two-minute drainage period to choose from without explanation as to how to decide between the two.

Let’s clear that up!


What size tail piece serves this fixture? 1-1/2” = 18.4 gpm, 2” = 22.5 GPM



Pipe Size (nominal)

CISPI Full Pipe Flows

CISPI 1/2 Pipe Flows

HGI for 1 Min Drain Time

HGI for 2 Min Drain Time

2 19.44 9.67 20 10 3 58.67 29.33 75 35 4 125.77 62.96 150 75 6 375.47 187.74 500 250














Thank you!

For more, log on to: www.schierproducts.com Or call: 1-800-827-7119


http://www.schierproducts.com/

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