DOMUSA TEKNIK Silo Manual de instruções de instalação e funcionamento - Página 9

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3.3

Installing the suction hose

The Silo is specially designed to function with the DOMUSA TEKNIK CVS suction system, installed

together with a plastic hose with an interior diameter of 50 mm. This hose must have a static

electricity discharge system, preferably a copper wire wound around its entire length. This copper

wire must be earthed at all the hose joints and ends.

Whatever the type of hose used, it must be made of a suitable material for wood pellet transport

and it must always have an interior diameter of 50 mm. The following recommendations must also

be complied with for correct installation:

 The maximum permitted hose length is 25 metres for conveyance from the main Silo to the

suction unit (CVS suction system pot) and 25 metres for return.

 Bend angles of over 45º must be avoided wherever possible. If these cannot be avoided, any

curves with angles of over 45º must have a radius of curvature greater than 125 mm.

 If rigid plastic tubing is used, do not use standard 90º elbows. If elbows are necessary, the

curves constructed must have a minimum radius of 125 mm.

 The maximum height difference permitted for the installation is 6 metres.

 Avoid any splicing or coupling in the hose installation wherever possible, as this may narrow

the circuit, which can cause clogging of the pellets conveyed and could block the system.

Most importantly, avoid any joints in the hose section leading from the main Silo to the boiler

reserve tank suction unit (suction pot), as the pellets are conveyed through this section.

 If there is no alternative to splicing and extending the installation, straight rigid tubing with

an interior diameter of 50 mm must be used. It is preferable for any splicing and joining of the

hose to be made in the pneumatic suction system return section, as only air is conveyed in

this section. All the hose sections must be earthed at all joints and at the ends of the hose.

 The most vital factor for ensuring maximum suction power for the system is the airtightness

of the CVS suction system installation, and great care must therefore be taken on installing

the hoses. All joints in the installation must be secured with clamps, taking special care to

prevent leakage.

 We recommend avoiding hose crossover in the installation wherever possible. The flow and

return hoses of the pneumatic installation should run parallel to each other.

 For correct assembly of the hoses, they should be fixed to the walls and/or floor using suitable

flanges throughout the entire installation, to ensure stability. The recommended maximum

distance between the fixing points is 80 -110 cm.

Some of these recommendations are illustrated in the figure below: