PRODUCTS AREA



PRODUCTION


The raw material used by COMISA SPA is brass, an alloy made of copper and zinc, identified by codes:
• EN 12165 CW 617 N for the alloy intended for hot forging and subsequent deburring.
• EN 12164 CW 614 N for the alloy intended for single / multi spindle machining.

Alloys not complying with these requirements cannot be used for supplying drinking water.

COMISA S.p.A. manufacturers its products by means of:
• Hot forging of the brass and subsequent deburring with Transfer machines
• Single / multi spindle machining for all those items that do not need forging.



Given the particular capacity of brass alloy to provide excellent mechanical resistance when cold and equally excellent malleability when hot, forging is undoubtedly the best technique for producing semi-finished products;
a brass bar, heated to around 700°C, acquires the shape set by the mould in which it is confined.
COMISA S.p.A. boasts of considerable specific experience in hot forging technology. The subsequent deburring is carried out at COMISA S.p.A.’s manufacturing bases, using advanced techniques; finishing processes are carried out on the forging using special tools, with mechanical tolerances limited to a few hundredths of a millimetre.
The processes involving direct use of the brass bar are carried out using automated single or multi spindle machines.
This technique is efficient in creating direct connections and helps to achieve a high degree of mechanical precision combined with great operational speed. The items produced in this way are subjected to a normalisation or tempering process to restore the original molecular structure of the material, which is necessary to prevent any stress ruptures.


The raw material used throughout our wide range of products is brass, an alloy made of copper and zinc, identified by codes:
EN 12165 CW 617 N for the alloy intended for hot forging and subsequent deburring.
EN 12164 CW 614 N for the alloy intended for single / multi spindle machining.

Alloys that not complying with these requirements cannot be used for supplying drinking water. COMISA SPA manufacturers its products by means of:
Hot forging of the brass and subsequent deburring with Transfer machines
• Single / multi spindle machining
for all those items that do not need forging.

Forging

Given the particular capacity of brass alloy to provide excellent mechanical resistance when cold and equally excellent malleability when hot, forging is undoubtedly the best technique for producing semi-finished products; a brass bar, heated to around 700°C, acquires the shape set by the mould in which it is confined. COMISA S.p.A. boasts of considerable specific experience in hot forging technology.

Machining

The subsequent machining is carried out at COMISA SPA.’s manufacturing bases, using advanced techniques; finishing
processes are carried out on the forging using special tools, with mechanical tolerances limited to a few hundredths of a millimetre.
The processes involving direct use of the brass bar, i.e. not the forged items, are carried out using automated single or multi spindle machines.
This technique is efficient in creating direct connections and helps to achieve a high degree of mechanical precision combined with great operational speed. The items produced in this way are subjected to a normalisation or tempering process to restore the original molecular structure of the material, which is necessary to prevent any stress ruptures.

Installation and assembly

Multilayer pipes

The COMISA multilayer pipe is a latest generation product, manufactured using advanced techniques when treating polyethylene polymers and combines the advantages of a plastic pipe with those made of metal. The COMISA multilayer pipe is flexible and robust, capable of bearing high pressures and high temperatures.

Manufacturing process
The multilayer pipe is made using a technically up-to-date manufacturing process.

  1. The polyethylene inner layer is extruded
  2. A first connective layer is applied to the outer surface
  3. At the subsequent step, a sheet of aluminium is wrapped around the pipe, welded and calibrated
  4. Another connective layer is applied to the outer surface
  5. A further polyethylene layer is applied.

The entire manufacturing process is carried out at a constant controlled temperature; it is fully automated and includes five consecutive Independent check points. Before transfer to stock, the item is checked again by specialist technicians to ensure it meets the strict quality standards.