GENERAL INFORMATION
APPLICATION
The MQD2H and MQD3H diaphragm pumps are designed to be used for
Diaphragm pumps use a positive displacement design rather than centrifugal force to move water through the casing. This means the pump will deliver a specific amount of flow per stroke, revolution or cycle. These pumps are commonly referred to as mud hogs, mud hens and mud suckers.Their names reflect their popularity for use in applications where shallow depths and slurry water render centrifugal pumps ineffective.
Power Plant
These diaphragm pumps are powered by a 4.0 horsepower air cooled,
Oil Alert Feature
In the event of low oil or no oil, the HONDA GX120 engine has a
Suction Lift
This pump is intended to be used for dewatering applications and is capable of suction lifts up to 25 feet at sea level. For optimal suction lift performance keep the suction hose or line as short as possible. In general always place the pump as close to the water as possible.
Pump Support
The pump should always be placed on solid stationary ground in a level position.
NEVER place the pump on soft soil. The suction hose or pipe connection should always be checked for tightness and leaks. A small suction leak in the hose or fittings could prevent the pump from priming.
Elevation
Higher elevations will effect the performance of the pump. Due to less atmospheric pressure at higher altitudes, pumps DO NOT have the priming ability that they have at sea level. This is due to the “thinner air” or lack of oxygen at higher altitudes.
A general rule of thumb is that for every 1,000 feet of elevation above sea level a pump will lose one foot of priming ability.
For example, in Flagstaff, Arizona where the elevation is approximately 7,000 feet, the pump would have a suction lift of only 18 feet rather than the 25 feet at sea level. Table 3 shows suction lift at various elevations.
Table 4. Suction Lift at Various Elevations
Altitude |
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| Suction Lift in Feet (Meters) |
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Feet (Meters) |
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Sea Level | 10.0 (3.048) |
| 15.0 | (4.572) | 20.0 (6.096) |
| 25.0 (7.620) | |||
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2,000 (610) | 8.80 | (2.680) |
| 13.2 | (4.023) | 17.6 | (5.364) |
| 22.0 (6.705) | |
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4,000 (1,219) | 7.80 | (2.377) |
| 11.7 | (3.566) | 15.6 | (4.754) |
| 19.5 | (5.943) |
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6,000 (1,829) | 6.90 | (2.103) |
| 10.4 | (3.169) | 13.8 | (4.206) |
| 17.3 | (5.273) |
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8,000 (2,438) | 6.20 | (1.889) |
| 9.30 (2.834) | 12.4 | (3.779) |
| 15.5 | (4.724) | |
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10,000 (3,048) | 5.70 | (1.737) |
| 8.60 (2.621) | 11.4 | (3.474) |
| 14.3 | (4.358) | |
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Table 4 shows percentage drops in performance as elevation increases.
Table 5. Performance Loss at Various
Elevations
Altitude | Discharge Flow | Discharge Head |
Feet (Meters | ||
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Sea Level | 100% | 100% |
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2,000 (610) | 97% | 95% |
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4,000 (1,219) | 95% | 91% |
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6,000 (1,829) | 93% | 87% |
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8,000 (2,438) | 91% | 83% |
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10,000 (3,048) | 88% | 78% |
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PAGE 12 — MQD2H/3H DIAPHRAGM PUMPS — OPERATION AND PARTS MANUAL — REV. #6 (10/27/11)
