Installing Drainpipes
Context
When installing drainpipes, ensure that the following requirements are met:
- The external drainpipe must have a downward gradient (> 1:100) along the drainage direction, and no accumulated water is allowed.
- The maximum lift of the drainage pump is 4 m, with the drainage height and drainpipe system resistance considered. If the total system lift is greater than 4 m, the water pump flow will be less than the rated flow. In this case, shorten the drainpipe length, reduce the number of bends (to reduce local resistance), or decrease the drainage height to ensure that the total system lift is less than or equal to 4 m.
Total lift of the water pump = Drainage height (Vertical height difference between the water pump and the highest point of the drainpipe) + Drainpipe system resistance (Length of the straight drainpipe section x Equivalent lift of the straight drainpipe section + Number of bends x Equivalent lift of bends)
Select a DN20 (3/4 inch) drainpipe. The equivalent lift of each meter of the straight drainpipe section is 0.0323 m, and the equivalent lift of each bend is 0.0317 m.
Assume that the drainage height is 3.9 m, the straight drainpipe section is 5 m, and two bends are used. The total lift of the water pump is 4.129 m. Calculation formula: 3.9 m + 5 x 0.0323 m + 2 x 0.0317 m = 4.129 m In this case, the total lift is greater than 4 m, and the water pump flow is less than the rated flow. It is necessary to shorten the drainpipe length, reduce the number of bends (to reduce local resistance), or decrease the drainage height.
The following uses a rigid drainpipe as an example to describe how to install a drainpipe.
Bottom Pipe Routing
- Remove the drainpipe plug, as shown by (1) in Figure 4-70.
- Install the water pipe conversion adapter and seal it with sealant, as shown by (2) in Figure 4-70.
- Cut a cross in the rubber ring using a utility knife and route the pipe wrapped with the thermal insulation tube through the hole.
Ensure that the rubber ring is not disconnected. If the rubber ring is disconnected or damaged, seal the gaps around the pipes with mastic cement or thermal insulation foam.
- Route the straight-through pipe through the pipe hole at the bottom of the cabinet and connect the pipe to the PPR pipe using a hot melt gun, as shown by (3) in Figure 4-70.
- Connect the drainpipe to the external drainage system.
- Wrap thermal insulation foam around the drainpipe (including the connectors).
Top Pipe Routing
When routing pipes from the top, do not route the pipes over servers or other devices to protect them from being affected by pipe leaks.
- Remove the drainpipe plug, as shown in Figure 4-71.
- Connect the drainpipe from the top by referring to the procedure for bottom pipe routing.
