Minn. R. Part 7080.2100 - DOSING OF EFFLUENT
Subpart 1.
General.
When pumping or dosing is necessary, it must comply with this part.
Subp. 2.
Pump
tanks.
A. Pump tanks shall meet or
exceed the requirements of parts
7080.1910,
7080.1970, and
7080.1980 to
7080.2020. All dosing chambers
must be vented.
B. The pump, pump
controls, and pump discharge line must be installed to allow access for
servicing or replacement without entering the pump tank.
C. The pump tank must either include an
alternating two-pump system or have a minimum total capacity of 500 gallons for
design flow values of 600 gallons per day or less or 100 percent of the design
flow for design flow values of greater than 600 gallons per day.
D. An ISTS with a pump must employ an alarm
device to warn of failure.
E. The
inlet of pumps must be elevated at least four inches from the bottom of the
pump tank or protected in some other manner to prevent the pump from drawing
excessive settled solids.
F.
Electrical installations must comply with applicable laws and ordinances
including the most current codes, rules, and regulations of public authorities
having jurisdiction and with part
1315.0200, which incorporates the
National Electrical Code.
Subp.
3.
Pumps for gravity distribution.
If a pump is used to lift effluent into a gravity distribution system, items A to C apply.
A. The
pump must discharge at least ten gallons per minute but no more than 45 gallons
per minute.
B. The pump must be
constructed and fitted with sound, durable, and corrosion-resistant
materials.
C. The pump must have
sufficient dynamic head for both the elevation difference and friction
loss.
Subp. 4.
Pumps for pressure distribution.
Pumps for pressure distribution must meet the requirements in items A to D.
A. Pumps must be
constructed and fitted with sound, durable, and corrosion-resistant
materials.
B. The pump discharge
capacity must be based on the perforation discharges for a minimum average head
of 1.0 foot for 3/16-inch to 1/4-inch perforations and 2.0 feet for 1/8-inch
perforations for dwellings. The minimum average head must be 2.0 feet for other
establishments with 3/16- to 1/4-inch perforations and 5.0 feet of head for
1/8-inch perforations. Perforation discharge is determined by the following
formula:
Q = 19.65 cd2h1/2
where: Q = discharge in gallons per minute
c = 0.60 = coefficient of discharge
d = perforation diameter in inches
h = head in feet.
C. The pump discharge head must be at least
five feet greater than the head required to overcome pipe friction losses and
the elevation difference between the pump and the distribution
device.
D. The quantity of effluent
delivered for each pump cycle must be no greater than 25 percent of the design
flow and at least four times the volume of the distribution pipes plus the
volume of the supply pipe.
Notes
Statutory Authority: MS s 115.03; 115.55
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