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.

Image gallery

Feed product heat exchangers (Texas towers) with 90-10 copper-nickel tubes and floating head for an oil refinery in Scotland
Low alloy texas tower floating head combined feed for aromatic complex, Holeflex hot combined feed exchangers

Heat exchanger

BUOH Converter for Ethylene Project
EO reactor feed product heat exchanger with shell expansion joint and stainless steel tubes for a chemical plant in Singapore, HP stripper bottoms effluent exchanger, High pressure screw closure heat exchangers with stainless steel U tubes for an oil & gas plant in the United States of America

Special heat exchanger

Ammonia unitized chiller with multi-stream design and low temperature carbon steel tubes for an ammonia plant in Brazil
High pressure steam superheater with high temperature stainless steel U tubes for an ammonia plant in Brazil, Special design secondary reformer waste heat boiler with exotic materials for an ammonia plant in Brazil, Carbamate condensers with special stainless steel tubes and cladding for an Urea plant in Iraq, Crude methanol trim condenser with stainless steel tubes for a methanol plant in Trinidad and Tobago


Polyol stripper condenser with titanium tubes and floating head for a chemical plant in Singapore
Titanium heat exchanger for LNG plant, Set of titanium components, Titanium welding, Titanium welding