Draincleaners

Required pressure

A certain amount of pressure is required to sufficiently loosen dirt in the drain. There is often talk of pressure build-up at the pump, but in reality, this is not important for cleaning. What is important is the pressure by the head of the drain cleaner, which flows into the drain that is important for cleaning. Too much pressure could damage the drain and casing, and can disturb the structure of the soil around the drain. The reason for this is the amount of water that must be released from the head into the drain. The more water, the better the drainage of dirt. The choice that has to be made is a compromise between the amount of pressure and the desired amount of water given in a certain amount of time. The  desired pressure at the nozzle is 10 to 15 bar, with at least 70 liters of water per minute. The desired amount of water at this pressure is also related to the diameter of the drain. This is because in a narrow drain the same liters, which enter at the same time, flow faster in comparison to a wide drain. Table 1 shows how high the pressure loss is with a different diameter and amount of water at the head of the flushing hose.

Pressure loss also occurs in the hose due to friction. The amount of pressure loss depends on the diameter of the hose and the length of the hose. As shown in table 2. The compromise is often found with a hose length of 300 meters. However, there are also flushing installations with a hose length of 400 meters. When purchasing a flushing hose, the longest discharge length available on the firm can be decisive. To prevent damage to the drain, the pressure at the head of the hose in the drain cannot be above 10 to 15 bar. As can be seen in table 2, that with an internal hose diameter of 20.4 mm, per 100 meters of length, there is 6.5 bar pressure loss when 70 liters of water are supplied per minute. Which means that with a hose length of 300 meters, the pressure at the pump must be 3 x 6.5 = 19.5 + 15 = 34.5 bar. And with an internal hose diameter of 19 mm, this is 3 x 9.1 = 27.3 + 15 = 42.3 bar. If a hose of 300 meters is extended by 100 meters, it should be considered that there will be loss of pressure at the head of the flushing hose as well as a loss of water.

Operation

The head of the flushing hose has a limited number of holes facing forward and significant larger number facing backwards. The input speed can be higher than the output speed, by a slow input pressure, water will collect at the head causing back pressure. Due to a high-speed output, vacuum may occur in front of the head due to the sucked in water column. Because of this soil parts can be sucked into the drain. if the pressure is too high, this is reinforced by the loosening of soil parts around the drain. too fast output also creates the risk that the head will be pulled through the dirty water column, which causes for dirt to be caught behind the head. However, the output speed may be higher with a low contamination than with a strong contamination.

The working speed of the entire drain length should be as constant as possible. An input speed of 25 to 30 meters per minute can be maintained on average. the output speed is 20% lower on average, resulting in a 20 to 25 meter per minute. Machines that are set automatically differ their in- and output speed by themselves. 

Nowadays, many drain cleaners are easy to operate from the tractor cabin. a fully hydraulic operation system takes care of the automatic input in the endtube. Hydro motors in combination with powered wheels provide a stepless variable in- and output speeds. To prevent damage to the hose, no slip should occur. Metercounters ensure that the distance to a possible malfunctioning can be determined. A large diameter reel is preferred.

The Homburg Holland Draincleaner Delta. For more information about our products, you can always viste our Draincleaner Website