Design

The Engineering Department is capable to perform the Thermal Design
using the most qualified Software Programs (HTRI or HTFS) and the
Mechanical Design in compliance with all International Codes of practice,
as ASME VIII Div.1 and Div.2, ASME I, PD 5500, AD MERKBLATT,
etc. and to International Standards TEMA, API, ANSI, DIN, UNI EN, etc.

Manufacturing steps

Semi-finished products such as plates, forgings and tubes are purchased by
Villa & Bonaldi from selected and qualified suppliers.
The entire production cycle is performed by the Company on its own premises.
Cutting and rolling machines are used for preparation of the plates.
Computerized Machining Centres are used to turn forgings and drill tubesheets.
Villa & Bonaldi’s welding equipment, procedures and staff are qualified and skilled to handle all normally treated materials such as carbon
steel, killed carbon steel for low temperatures, low-alloy steel, medium-alloy steel, austenitic and ferritic and duplex stainless steel, cladded
steel, copper alloys, nickel alloys and titanium.
Villa & Bonaldi has the up-to-date equipment for manual and automatic welding, as well as for pre-heating and post-heating operations.
The Company has perfected the skill of making faultless weld deposits starting from wire under gas and strip under flux.
The construction of the tube bundle is closely followed at each and every step. Tubesheets and baffles are always in compliance with strictly
defined and stringently controlled tolerances.
“U” hairpins are produced in a special workshop equipped with a tube bending system capable of complying with standards even for small radii.
Tubes are fixed to tubesheets by means of two methods: expanding and/or welding. In expanding, the force is controlled electronically and
the calibration continuously monitored. Welding is performed either manually or by computerized guns.