The vacuum line
From vacuum pump to interceptor
The pump's capacity determines the diameter needed for the vacuum pipe (the data needed can be found in the ISO standards), although there are certain other aspects that should be emphasised.
Diameter of the pump output
Never use pipes with a diameter smaller than the pump's output. It is important to include a 50 cm galvanised connector between the pipe (usually PVC) and the pump in order to prevent problems caused by heat or vibrations. This should also provide protection against possible leaks.
Distance between pump and interceptor
It should be as short as possible and avoiding curves as much as possible.
Interceptor inputs and outputs
They must be compatible with the pipe diameter chosen.
Thickness of the pipe material
Pipes must be able to support the working pressure (up to 90 kPa) and must not be impacted by the passage of time (PVC crystallisation).
Control of vacuum and flow
Create vacuum measurement points and an input for the flow meter. For the flow meter, it must be ensured that the stop closes correctly (guillotine valves are ideal).
From interceptor to sanitary trap
The diameter of the pipe should be maintained along its entire run. Inputs and outputs from the sanitary trap must be at least 76 mm. This line must allow installation of the regulator, as well as the balance tank (if one is used).
A measuring point must be installed in the regulator close to the sensor (DeLaval or Manus models), or far away from areas where flow increases or decreases (Sentinel). In Westfalia, Boumatic or Surge type regulators the measurement may take place in the sensor pipe.
Pulsation vacuum line
The number of pulsators will determine the diameter of pipe required. The type of pulsators that will be used must be taken into account (consumption and whether they will operate as a cascade or all at once) as well as possible system expansions and installation of new accessories (such as ACR systems or gate opening systems).
There must be drains and vacuum measurement points (the ideal location is where the ring closes). In some operations it can be useful to install accessory taps for milk separation.
Sanitary trap and receiver vessel
Sanitary trap and receiver vessel must form a matching set. The connection between both must avoid producing significant reductions in the diameter of the vacuum pipe, with the calibre of the milk transfer line from the milking system maintained. A sanitary trap with 52 mm inputs and outputs joined to 70 mm milk and vacuum lines represents a significant narrowing.
The sanitary trap and receiver vessel must be integrated into the washing, especially the sanitary trap, and safety devices may also be used to prevent the entry of milk or water into the vacuum system.
It is important to use receiver vessels with 70 mm inputs, since these will allow work with any pipe in the diameter range of 52-70 mm. In some it is possible to replace glass with 52 mm connections with glass having 63 mm connections. The receiver vessels must have pumping systems (float/timer) that regulate the movement of milk through the pressure pipe.