- Installation of an Automatic Siphon in Precast Concrete Manhole
- Installation of an Automatic Siphon in a 3 Compartment Septic Tank
- Installation of an Automatic Siphon in a Concrete Dosing Tank

Our instructions show the floor line 3 inches below the bell or the low water line (figure 4). Although this is the standard installation other types of installation will work.
The floor line may be dropped below the outlet of the siphon with the discharge of the siphon run through the side of the tank (figure 5). The entire siphon may be placed in the tank. A pedestal is poured around the siphon trap to hold it secure. The discharge piping is run through the side of the tank (figure 6). The additional depth below the siphon bell (or the low water line) provides additional settling capacity for solids that were not settled out in the first compartment(s) of the tank. If it is ever necessary to work on the siphon, the tank will need to be pumped out before the siphon can be accessed. It is important that the siphon be held secure, plumb and level; once this requirement is met, it is possible to mount the siphon several different ways. |

In dual alternating siphon installations, care must be taken to set both traps at the same elevation. They must both be plumb and level. The siphons must NOT discharge into the same line or an interconnecting line because this will permit the discharge from one siphon to refill the trap of the idle siphon and prevent alternating operation. The siphons may be close together or at opposite ends of the dosing tank. The outlets do not need to be parallel to each other. The discharge lines can be set in any direction, though they must NOT run uphill.
## Optional Overflow PipeThe Overflow pipe serves two functions; it vents the siphon to the atmosphere and it provides a safety outlet in the unlikely event the siphon should fail. We believe that the simplest method of installing the overflow is to place a 'T' fitting on the outlet of the siphon and bring it straight up (figure 4). It is acceptable to run the discharge of the siphon to a point just outside of the dosing tank, put a 'T' fitting on at this point, and run the overflow pipe up and through the side of the dosing tank (figure 7). |

Two siphons placed in the same tank at the same elevation will alternate automatically without the need for any additional equipment.

By using a personal computer to control the solenoid air valves, up to 32 siphons may be sequenced. Siphons are an inexpensive and reliable substitute to large solenoid controlled valves.

The current drawn by the electrical alternating siphons is minimal, and much less than the current drawn by pumps. In addition, the components are inexpensive and easy to replace.

The volume of liquid dosed by the siphon is a function of the area of the tank and the drawing depth of the siphon.

Example 1: To figure the volume of dose of a Model 417 siphon (17" drawing depth) placed in a rectangular tank with inside dimensions of 4' x 5' | ||

Step | What to do | Calculation |

1 | Figure the area of the tank in square inches | 48" x 60"= 2880 in^{2} |

2 | Figure the volume in cubic inches (The drawdown of the siphon x the area of the tank) | 17 x 2880 = 48,960 in^{3} |

3 | Convert to cubic feet (divide by 1728) | 48960 / 1728 = 28.33 ft^{3} |

4 | Convert cubic feet to gallons (there are approximately 7.48 gallons in a cubic foot) | 28.33 x 7.48 = 211.93 gallons |

Example 2: To figure the volume of dose of a Model 630 siphon (30" drawing depth) placed in a round tank with an inside diameter of 65" | ||

Step | What to do | Calculation |

1 | Figure the area of the tank in square inches
( PI x diameter^{2} / 4) |
(3.14 x 65^{2}) / 4 = 3318.31 in^{2} |

2 | Figure the volume in cubic inches (The draw down of the siphon x the area of the tank) | 30 x 3318.31 = 99,549 in^{3} |

3 | Convert to cubic feet (divide by 1728) | 99,549 / 1728 = 57.61 ft^{3} |

4 | Convert cubic feet to gallons (multiply by 7.48) | 57.61 x 7.48 = 430.92 gallons |

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