Standard Operating Guidelines (S.O.G.)
For Spamco 95 /120 GPM Foam System
1.0 Purpose
  1.1 The purpose of this bulletin is to familiarize users with the operation of the Spamco 95/120 gpm foam system and establish basic guidelines.
  1.2 Variations in the fire ground guidelines should be anticipated due to conditions found at the incident.
2.0 Characteristics of the Spamco 95/120 GPM Foam System
  2.1 The Spamco 95/120 GPM eductor is variable rate balanced pressure inline proportioner. The normal operating inlet pressure range is 60 psi – 200 psi. Note: While the eductor can operate at pressure in excess of 200 psi, this should not be done because of safety reasons. If pressures in excess of 200 psi are used when the nozzle is shut down; the static pressure will exceed safe recommended hose practices pressure.
  2.2 The rate of proportioning is variable from 0 – 6% by use of the metering valve.
  2.3 The pressure drop through the eductor is approximately 25%.
E.g. 100 psi eductor inlet pressure will yield 75psi outlet pressure
  2.4 The system will tolerate rapid pressure fluctuations.
  2.5 The eductor will provide correct pick up percentage over normal range (60 – 200 psi).
  2.6 The eductor body is brass construction.
  2.7 Hose connectors are hard coated alloy
  2.8 The nozzle is constructed with a stainless steel barrel with a lightweight alloy shut off ball valve
  2.9 Nozzle Flow
Nozzle Inlet Pressure (PSI) Flow (GPM)
70 95
100 120
3.0 Fire Ground Guidelines
  3.1 The most common method of operation will have the eductor connected directly to the pumper discharge. The eductor may also be remotely from the pumper by use of hose.
  3.2 Performance of the system will be affected by the flow, length, size and type of hose deployed. The distance between the eductor outlet and the nozzle will depend upon the hose size and flow. A larger hose size and or less flow will increase the usable distance between the nozzle and eductor. The following charts will give an indication of the eductor inlet pressure required for operation:

120 GPM @ 100 PSI Nozzle Inlet Pressure
Eductor Inlet Pressure
Distance (Ft.) 1½" Hose (PSI) 1¾" Hose (PSI) 2" Hose (PSI)
100 175 155 145
200 NR* 185 160
300 NR* NR* 195
95 GPM @ 70 PSI Nozzle Pressure
Eductor Inlet Pressure
Distance (Ft.) 1½" Hose (PSI) 1¾" Hose (PSI) 2" Hose (PSI)
100 120 105 100
200 150 120 110
300 180 135 120
400 NR* 150 130
500 NR* 165 140
600 NR* 180 150

NR* Not recommended
Note: Above pressures rounded off to nearest 5 psi.
  3.3 The user should test the entire system as it used: hose, eductor and nozzle to determine the correct pump pressure.
  3.4 Manufacturers of foam concentrate have a recommended application rate for foam solution (foam concentrate and water after going through the eductor). This is the amount of foam solution applied in gallons per minute per square foot. Example: 0.1 gpm/sq. ft. would mean one tenth gallon of foam solution applied to each square foot of the fire surface per minute.
  3.4a To determine the correct flow of foam solution required; the area of the target must be multiplied by the application rate equals the amount of foam solution recommended for that situation.

Example: Area + 25ft X 20ft.      Application Rate: 0.2gpm/ft2
Area X Application Rate = Flow
(25 X 20) X 0.2gpm/ft2 = Flow
500 Ft2 X 0.2gpm/ft2 = 100gpm
  3.4b Another method to determine if your system is adequate for the situation is to rate the system by square footage of target area. This table should assist you:

Application Rate
95 (GPM) 120 (GPM)
0.1 950 ft2 1200 ft2
0.2 475ft2 600ft2
0.3 300ft2 400ft2
0.4 237ft2 (240ft2) 300ft2
  3.5 Automatic Nozzles
  3.5a There are many manufacturers of automatic nozzles and these have successfully been used with the Spamco 95/120GPM eductor. These nozzles typically require 100 psi nozzle inlet pressure to operate correctly and the flow will vary according to pressure. Note: The system should be tested prior to use in the field to determine the correct pump pressure.
  3.5b The following will illustrate how to determine the distance between the nozzle and eductor when the eductor is placed at the pump discharge with 200 psi inlet pressure at the eductor.

133 psi will be required to provide 100 psi nozzle inlet pressure after the eductor.

There is approximately 67 psi gross pressure available for friction loss ( 50 psi at eductor discharge). Theoretical flow charts may be used for various hose sizes to determine flow and distance that may be obtained.
4.0 Other Nozzles
  4.1 Other nozzles may used with the Spamco 95/120 GPM eductor provided the nozzle requirements are with the recommended ranges of flow and pressure
5.0 After Foam Operations
  5.1 When the foam operation has been completed the system should be flushed. A clean container should be provided and filled with clean water.

The foam pick up tube should be placed in the container and the system operated. The foam metering valve should be rotated through the full range several times. Note: A minimum of fifteen(15) gallons of clean water shall be run through the system to ensure the equipment is thoroughly cleaned.
  5.2 When the foam operation has been completed the system should be flushed. A clean container should be provided and filled with clean water.

The equipment shall be returned to storage and the metering valve set to the proper percentage per department standard operating guidelines..
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