Other Design Considerations; Grease Separators - ZURN Proceptor GMC 100 Technical Manual

PROCEPTOR®
TECHNICAL MANUAL

3.2 OTHER DESIGN CONSIDERATIONS

Gravity separators rely on retention time (the amount of time wastewater is retained in the separator) to allow oil and grease to
float to the top and solids to settle to the bottom.
The retention time required to meet regulated discharge limits is a function of the type of contaminants present in the
wastewater, initial loading rates, particulate size, specific gravity, and the interactive potential of certain pollutants and the
separator design. Although flow rates are important design criteria for the selection of a separator, they are not the only criteria.
Other factors need to be considered as well, a few of which are listed below:
1 Monitoring Oil/Grease Level. Manual monitoring must be performed before a regular cleaning schedule can be established.
If and when increased activity occurs, the cleaning schedule must be adjusted accordingly. Zurn Green Turtle takes the
guesswork out of servicing the separator when an electronic alarm is used to indicate when the system needs maintenance.
2 Remote Suction Maintenance. Remote suction pipe are available for indoor application where the maintenance cover
is not easily accessible by pump trucks, or where opening the maintenance cover is undesirable due to odor issues. The
Proceptor can be equipped with a factory installed suction pipe which extends from the bottom of the tank. The suction
pipe is connected to a camlock fitting on an exterior wall for pump truck access.
3 High Contaminant Loading. High contaminant loading in processed wastewater requires a larger separator to allow for a
longer retention time and more storage capacity.
4 Reduce Frequency of Maintenance. Increasing the size of the separator may reduce the frequency of maintenance, a
cost-effective solution for many applications.
5 Light Emulsification. Larger capacity separators should be used in wash-down or car wash applications where oil
globule sizes are quite small as a result of the interaction with high pressure water. Also, the soaps or detergents used will
chemically emulsify oil and a longer retention time is required for the oil emulsion to break down.
6 Space Restriction. Coalescers can be used to reduce the size of the separator for the same treatment flow rate (oil applications
only). Solids must be separated prior to entry into the coalescer since solids tend to plug coalescing filters quickly.
Coalescers are not recommended for high solids/sediment wastewater applications due to the frequency of maintenance.
7 Above-Ground Installation in Cold Climate. Separators intended to be installed above the frost line may be required to
be insulated and/or equipped with explosion proof heaters.

3.3 GREASE SEPARATORS

Proceptor gravity grease interceptors are available in several design configurations to meet applicable Plumbing Code
standards throughout North America.
Sizing for Proceptor grease interceptors should always comply with applicable local, Provincial, State and Federal Codes. The sizing
guidelines provided below are Minimum Provincial Code Calculated 1 minute residence time sizing - Section 3.3, or Manufacturer Sizing
- Section 3.3.1 and 3.3.2, or CSA / PDI (Plumbing and Drainage Institute) Sizing - Section 3.3.3, and are included as guidelines only.
Model Number
GMC 50
GMC 100
GMC 150
GMC 200
GMC 250
GMC 300
GMC 500
8
Minimum 1 Minute Residence Time Proceptor Grease Separator Sizing Chart
1 Minute Residence Time
Flow Rating
(US gpm)
50
100
150
200
250
300
500
Minimum Grease Capacity
Pounds
100
200
300
400
500
600
1000
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