Info

Pumps

<p>Depending on the vehicle type, there exist</p><ul><li> <p>high-pressure pumps,</p></li> <li> <p>vacuum pumps</p></li> </ul><p>or both types of pumps can be used at the same time</p><div class="clearfix layout-row columns-2"><div class="layout-column first column-1"><p>(Image: HP piston pump)</p></div><div class="layout-column last column-2"><div><p>(Image: Vacuum pump)</p></div></div></div><p><strong>Images:</strong> High-pressure piston pump (left) und vacuum pump (right) [Image: Prof. Dr. Ing. Stein &amp; Partner GmbH]</p>

Pumps (2)

<div>(Table: High-pressure pumps as per [KA 4/97 ])</div>

Pumps – drive system

<p>The pumps are arranged behind the driver's cab and are driven by the vehicle's engine through an independent transmission and v-belt.</p><p>(Image: Pumps drive system)</p>

Performance parameters and standard values for high-pressure pumps

<p>The pumps installed in the vehicles have to meet the following performance requirements [ATV/VKS] [G&#252;tes03] [FI-M&#252;ller].</p><div>(Table: Performance parameters and standard values for high-pressure pumps subject to the nominal size of the sewer)</div>

High-pressure pumps – Piston pumps

<div class="clearfix layout-row columns-2"><div class="layout-column first column-1"><p>Piston pumps, also called plunger pumps, are the most commonly used types of pumps in cleaning vehicles (Animation). Occasionally, a hydraulically driven high-pressure water pump that directly converts oil pressure into water pressure is used [Geib2002].</p><div class="visible-pdf">Animation: HP piston pump valve [Image: visaplan GmbH]. This interactive element is only visible in the online version of the module.</div></div><div class="layout-column last column-2"><div><p>(Image: Piston pump components)</p></div></div></div><p>(Video: Ventil of the high-pressure &#8230;</p>

High-pressure pump comparison

<div>(Table: Comparison of the types of high-pressure pumps used in cleaning vehicles)</div>

Vacuum pumps

<div>(Table: High-pressure pumps)</div>

Vacuum pumps (2)

<p>Removing the accumulated waste material from the respective manholes is of essential importance for the success of the sewer cleaning procedure. Vacuum pumps with 0.6 bar negative pressure and induced volumetric flow rate of 680 m³/h to 4,000 m³/h are usually used for this purpose.</p><div class="clearfix layout-row columns-2"><div class="layout-column first column-1"><div>(Image: Liquid ring pump - Detail)</div></div><div class="layout-column last column-2"><div>(Image: Liquid ring pump - front view)</div></div></div><div class="visible-pdf">Animation: Rotary vane pump [Image: visaplan GmbH]. This interactive object in only visible in the &#8230;</div>

Vacuum pump comparison

<div>(Table: Comparison of different types of vacuum pumps)</div>

Vacuum pumps – Ejector

<div class="clearfix layout-row columns-2"><div class="layout-column first column-1"><p>The maximum suction lifts of the solid-liquid-mixtures amount to between 9 m to 12 m, and can only be realized by the addition of air to the suction flow by means of openings near the end of the suction tube. These processes decrease the specific weight of the solid-liquid-mixture to be extracted and, at the same time, increase the flow velocity in the suction tube. Suction lifts between 12 to 25 m require the usage of ejectors that are positioned &#8230;</p></div></div>