Fighting the FOG

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© Canplas Industries Ltd. 2014-16

© Copyright Materials

Rachel Beaulieu B. Engineering,

Product Manager - Endura®

C: 249-877-0737 T: 705-726-3361

E:rbeaulieu@Canplas.com

Learning Objectives

What is FOG and why should we care? Sources of FOG

environmental and financial impact

What is a Grease interceptor? Different types

The science of FOG

How does a grease interceptor work? Sizing

Standards and regulations

Maintenance and operation

A “WHALE” OF A PROBLEM

• “Fatberg” = a mass of congealed fat, rotting food and used wet wipes.

• 130 tonnes (143 tons)• 250m (820ft) long• Took over 3 weeks to

clear. • Thames Water spends £1

million a month clearing blockages from London’s sewers.

ONE YEAR LATER…

THE ARTERIES OF OUR CITIES!

Grease Interceptor

def: “A plumbing appurtenance or appliance properly sized & installed in a gravity drainage system to intercept, retain & facilitate the proper removal of non-petroleum fats, oil, and grease (FOG) from commercial, industrial & institutional wastewater discharge, prior to entering the municipal network”

Image courtesy of Canplas Industries Ltd

Gravity (GGI) Difference in specific gravity Sized on physical capacity Uncontrolled gravity flow Retention time(min 30 minutes)

Hydromechanical (HGI) Difference in specific gravity Sized on flow rate Flow control Generally smaller than GGI

Grease Removal Device (GRD) Difference in specific gravity Similar to HGI Electronic and mechanical components

Three Types of Grease Interceptor

Gravity (GGI)

Minimum 350Gal, but typically 750Gal +.

Commonly made of 4-inch precast concrete.

Interior barriers create chambers (min 2).

Typically used outside buildings, in-ground.

Do not include flow-control arrangements.

Can be configured with features designed by an Engineer to meet local jurisdictional requirements and/or a given project

MICC (Microbial Induced Concrete Corrosion)

Gravity Grease Interceptor (GGI)

Image courtesy of Canplas Industries

Hydromechanical (HGI)

Flow control – Internal or External (PDI Requirement)

Sized by flow rate

7gpm to 100gpm (75gpm up = “Extended Capacity”)

Comprehensive performance testing to Nationally recognized standards

(PDI G101, ASME A112.14.3, CSA B481.1)

Typically made of metal or plastic

Different life expectancies

Can be installed inside or outside

Hydromechanical (HGI)

Image courtesy of Canplas Industries Ltd

Similar to HGI

Two variations: Timer-controlled & Sensor-controlled

Often fitted with an electric immersion heater.

Manufacturer should be consulted regarding electrical, service and regular maintenance requirements.

GRD operator requires thorough training.

No GI should be considered a fit & forget solution.

Grease Removal Device (GRD)

Grease Removal Device (GRD)

Image courtesy of Thermaco (Jan 2015)

The majority of jurisdictions rely on Model Plumbing Codes to provide adequate definition of FOG management products & basis of enforcement.

Codes & Standards

Model Plumbing Codes

© 2017 Canplas Industries Ltd

North American Performance Standards

Performance Standard Interceptor Type Covered Published by

ASME A112.14.3Hydromechanical Grease Interceptors (HGI) -

up to 100gpm

American Society of Mechanical

Engineers

ASME A112.14.4 Automatic Grease Removal Devices (GRD)

ASME A112.14.6 FOG Disposal Systems (FDS)

PDI-G101Hydromechanical Grease Interceptors (HGI) -

Type 1Plumbing & Drainage Institute

PDI-G102 Grease Interceptor Sensing & Alarm Devices

CSA B481 Grease Interceptors (up to 100gpm) Canadian Standards Association

IAPMO/ANSI Z1001Gravity Grease Interceptors (GGI) - Precast

Concrete

IAPMO - International

Association of Plumbing &

IGC 273 Hydromechanical Grease Interceptors (HGI)

NSF ES15741Testing of Large Capacity Grease

Interceptors Using Accelerated Protocol

NSF - National Sanitation

Foundation

ASTM C1613Gravity Grease Interceptors (GGI) - Precast

Concrete

ASTM C2239-12a

Standard Specification for Polyethylene (PE)

Plastic Pipe (SIDR-PR) Based on Controlled

Inside Diameter

ASTM International

Designed to simulate worst case plumbing installation (Temperature, Head Pressure, High FOG)

Approved interceptors will have a minimum average grease removal efficiency of >90% and will retain not less than 2-1/4 lbsof grease for each 1 gpm discharged.

HGI’s up to 100gpm with External Flow Control

According to PDI's website (www.pdionline.org) there are 24 manufacturers with grease interceptors certified to this standard.

Testing under ASME A112.14.3 is similar to that under PDI G-101 except it is based on 2 lbs for each 1 gpm discharged

Governs Hydromechanical Interceptors with no upper limit on GPM rating.

Covers Cleaning, sizing and installations.

Specifies the minimum requirements for the performance, safety, and quality of HGIs.

Performance tested to ASME A112.14.3/4.

Covers material, design, and construction requirements Additional requirements for material performance, cover load

rating, internal component quality & hydrostatic pressure testing.

The most comprehensive of the North American GI performance Standards

IAPMO/ANSI Z1001

This is the primary standard governing gravity grease interceptors (GGI)

Governs design requirements and construction material requirements.

Does not require a performance test for certified units, but rather only mandates leakage testing.

There is some conversation indicating that in the future GGI’s will be required to have a performance test similar to that of HGI.

Sizing an HGI

Several manufacturers now have mobile and/or online tools to assist

Two Step Sizing Method for HGIs

Applies to Hydromechancial Grease Interceptors tested to Max. Grease Capacity defined by ASME A112.14.3.

Identifies generic types of FSE & suggests average grease discharge per meal.

Two uses:1. “two step sizing” to aid in choosing between two interceptors of

the same flow rate (but different Grease Capacities)2. Number of operational days before max. Grease capacity is reached

and maintenance required.

ASPE Plumbing Engineer Design Handbook, Volume 4 Ch. 8 Table 8-3

1. TWO STEP SIZING METHOD

ASPE Plumbing Engineer Design Handbook, Volume 4 Ch. 8 Table 8-3

Meals Per Day:

500

Grease (lbs) Per

Meal:

0.0325lbs

Pump Out

Frequency:

30 days

Grease Capacity

Required:487.5lbs

2. ESTIMATED MAINTENANCE SCHEDULE

ASPE Plumbing Engineer Design Handbook, Volume 4 Ch. 8 Table 8-3

Meals Per Day:

500

Grease (lbs) Per

Meal:

0.0325lbs

Pump Out

Frequency:

34.4 days

Max. Grease

Capacity:559lbs

Sizing a GGIUPC – Table 1014.3.6IPC – 1003.3.6 Physical Capacity:Gallon capacity (volume) of the interceptor based on discharge fixture units (DFU’s) entering the interceptorOr… Calculated flow capacity (total of fixtures or pipe diam.) x 30mins

Example - UPC:

Maintenance & OperationRegardless of type, even the best designed, highest performing grease interceptor is just a drain blockage waiting to happen, without the proper, thorough and timely maintenance!

25% Rule??Originated as a means to define a maintenance frequency for GRAVITY GI’s – due to there being no performance test.

Maintenance mandated when 25% liquid volume (Combined FOG and Solids)

This approach is often wrongly applied to HGI – Max. Grease capacity is defined

28

This concludes today’s session

Faith Winter BSc(Hons),

Market Development Specialist - Endura® Separation Technologies

C: 705-718-5865 T: 800-461-1771 E: fwinter@canplas.com