types, sizing, application and maintenance a brief overview
DESCRIPTION
GREASE INTERCEPTORS. Types, Sizing, Application and Maintenance A Brief Overview. Presented by Max Weiss, Consultant Jay R. Smith Mfg. Co., Inc. Grease Interceptors - A Brief Overview. Nomenclature: Traps vs. Interceptors 1 Interceptor Subtypes 2-6 - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/1.jpg)
Types, Sizing, Application and Types, Sizing, Application and MaintenanceMaintenance
A Brief OverviewA Brief Overview
Presented by Max Weiss, ConsultantPresented by Max Weiss, Consultant Jay R. Smith Mfg. Co., Inc.Jay R. Smith Mfg. Co., Inc.
![Page 2: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/2.jpg)
Nomenclature: Traps vs. Interceptors 1
Interceptor Subtypes 2-6Hydromechanical Grease Interceptors (GIs)Grease Recovery Devices (GRDs)Fats, Oils and Grease (FOG) Disposal SystemsGravity Grease Interceptors
Sizing 7-11Hydromechanical GIs – based on pipe size
Gravity GIs – based on pipe size
Hydromechanical GIs – based on fixture capacity
Gravity GIs – based on fixture capacity
Application 12
Maintenance 13-23Pros/Cons by Type
Conclusion 24
![Page 3: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/3.jpg)
Nomenclature clarification
► Recent changes in codes and standards to clarify mixed terms
► “Trap” has been eliminated in ASME Standards, UPC, CSA and
(pending) IPC
► “Interceptor” is deemed to be a more inclusive term
► “Interceptor” allows for a more precise distinction between
devices
► First official adoption was by IAPMO during its comprehensive
rewrite of Chapter Ten (10) of the Uniform Plumbing Code.
1
![Page 4: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/4.jpg)
Hydromechanical Grease Interceptors (GIs)
Grease Recovery Devices (GRDs)
Fats, Oils and Grease (FOG) Disposal Systems
Gravity Grease Interceptors
2
![Page 5: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/5.jpg)
Definition
Hydromechanical Grease Interceptor [Plumbing Drainage Institute]
3
![Page 6: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/6.jpg)
Definition
Grease Removal Device [Plumbing Drainage Institute]
4
![Page 7: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/7.jpg)
Definition
FOG Disposal System [Plumbing Drainage Institute]
5
![Page 8: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/8.jpg)
Definition
Gravity Interceptor [Plumbing Drainage Institute]
6
![Page 9: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/9.jpg)
UPC, Chapter 10, Appendix H Limitations
Drainage Fixture Units [DFU] Misconception
Maximum Flow Sizing
Grease Interceptor Sizing Truths
7
![Page 10: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/10.jpg)
Pipe Diameter Slope* GPM** Nominal Interceptor Rating2.0 .120 13.75 15gpm
.240 19.44 20gpm3.0 .120 41.49 50gpm
.240 58.67 75gpm4.0 .120 88.93 100gpm
.240 125.77 125gpm5.0 .120 162.46 175gpm
.240 229.75 250gpm6.0 .120 265.50 275gpm
.240 375.47 400gpm8.0 .120 575.81 600gpm
.240 814.32 825gpm* Inches drop per foot of run.**Based on Mannings formula with friction factor N=.012 as published by Cast Iron Soil Pipe Institute (CISPI)
Or, actual fixture volume plus hydrant capacity, divided by drain period whichever is less.
8
![Page 11: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/11.jpg)
Pipe Diameter Slope* GPM** Nominal Interceptor Volume***2.0 .120 13.75 500 gal.
.240 19.44 7503.0 .120 41.49 1,250
.240 58.67 1,8004.0 .120 88.93 2,750
.240 125.77 4,0005.0 .120 162.46 5,000
.240 229.75 7,0006.0 .120 265.50 8,000
.240 375.47 11,5008.0 .120 575.81 18,000
.240 814.32 25,000* Inches drop per foot of run.**Based on Mannings formula with friction factor N=.012 as published by Cast Iron Soil Pipe Institute (CISPI)***Based on 30 min. retention (Metcalf & Eddy) rounded to nearest volume of 250 gal. increments.
Or, actual fixture volume plus hydrant capacity, divided by drain period X 30 whichever is less.
9
![Page 12: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/12.jpg)
Calculation of fixture capacity:
[Length] X [Width] X [Depth] / [231] = Gallons X [.75 fill factor] / [Drain Period (1 or 2)]
Add hydrant capacity (gpm supply); Add dishwasher, water wash hood at manufacturer ratings.
EXAMPLE:
Fixture Compartment Size, in.
Compartments
Load,gal Recommended Interceptor Size,
One-Minute Drain
Two-Minute Drain
24x24x12 2 44.9 50 25
The selection listed is based on application of the sizing formula above.
10
![Page 13: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/13.jpg)
Multiply the result of either "Fixture Capacity" or "Pipe Size" (above) by 30 to reflect required retention time.
EXAMPLE35 gpm X 30 = 1,050 gal. capacity.
This sizing method is the "Uniform Interceptor Sizing“ – for obvious reasons.
All parameters are uniformly applied to the computation of GPM from any given facility to any given interceptor.
11
![Page 14: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/14.jpg)
Why is an interceptor required?
Pretreatment as the prime consideration
Administrative convenience versus concern for water
quality
Versatility of installation, proximity to FOG source,
decreased maintenance frequency
12
![Page 15: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/15.jpg)
Hydromechanical GIs
ProsLocated near the FOG source
Usually small compared to gravity units
Can be cleaned with conventional dip and bucket or small vacuum units
ConsMore convenient to ignore than to clean
Will continue to flow water even after they no longer function as an interceptor
Rarely have third party maintenance verification
13
![Page 16: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/16.jpg)
Grease Removal Devices
ProsLocated near the FOG source
Automatically remove FOG for proper disposal
Less maintenance required
ConsMore expensive initially than hydromechanical GIs
Require solids separation preceding the waste stream
Have moving parts and are prone to mechanical problems
14
![Page 17: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/17.jpg)
FOG Disposal Systems
ProsRequire less maintenance than GRDs – some requiring only annual service
Can be quite small relative to the size flow capable of being treated
Have the most rigorous performance testing and usually provide the cleanest effluent
Remove solids with the use of a solids interceptor
ConsMore expensive than hydromechanical GIs and most GRDs
Require attention to solids interceptors – neglect can affect performance of some units
Frequently foreign to local jurisdictions
15
![Page 18: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/18.jpg)
Gravity Interceptors
ProsMore recognized and usually easier to get approved by local authoritiesRequire little or no attention from the facility operatorCompatible with third party maintenance
ConsSignificantly more difficult and expensive to install
The most frequently improperly sized interceptors
The least efficient in terms of FOG separation
Prone to hydrogen sulfide generation and accelerated corrosion
Falsely believed to be capable of FOG storage exceeding 30 days
Expensive to service at proper frequency and thoroughness
16
![Page 19: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/19.jpg)
17
FOG in Lift Station
![Page 20: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/20.jpg)
18
Corrosion Interior Concrete Interceptor
![Page 21: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/21.jpg)
19
Other Lines in Lift Station
![Page 22: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/22.jpg)
20
Combined Sewer Clogged with Grease
![Page 23: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/23.jpg)
21
Grease in PVC Pipe
![Page 24: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/24.jpg)
22
Channel in Grease Layer
![Page 25: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/25.jpg)
23
Bag Type Interceptor
![Page 26: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/26.jpg)
Rarely is the best interceptor for the job selected.
Even more rarely is the selected interceptor sized correctly.
Even rarer still is the interceptor that is installed correctly.
Nonexistent is the interceptor that is the right interceptor for the job, sized properly, installed correctly AND operated and maintained as the manufacturer intended with the intent of producing the highest quality effluent possible.
24
![Page 27: Types, Sizing, Application and Maintenance A Brief Overview](https://reader036.vdocuments.mx/reader036/viewer/2022062518/56814320550346895daf86e9/html5/thumbnails/27.jpg)