The Tosto Group carries out its manufacturing activities in ten workshops, eight of them are located in Italy, six in Chieti, one in Ortona and one in Mantua. The other two  workshops are located in Bucharest and Oltenița (Romania).

The strategic location of our facilities guarantees an optimal logistic organization, enabling us to ship the finished items via sea-river routes. Indeed we can count on the direct accesses on the Adriatic sea (Ortona), Po (Mantua) and Danube (Oltenița) rivers.

Maraldi is located in Bertinoro (Italy). It includes all the services like: Commercial & Estimation/Proposal activities, Engineering, from feed to detailed Design, focused on Site activities, Quality, Project Management covering all the activities starting from engineering management till the completion start-up and Commissioning, Construction Management expertise.

Maraldi aims to place itself among the world’s élite manufacturers of pressure spheres and cryogenic tanks. To achieve this, we are equipped with a wide machine park and innovative technologies, which allow us to internally carry out all the critical activities. As a result, the company is able to manufacture and transport products without weight and size limits.

Hydraulic Press 3000 t

Pressing Machine 1000 tons

Waldrich PowerTech Milling Machine

Dino 9000 t Bending Machine

The welding process is the core of our manufacturing activities.

Our Welding Department is able to employ the following welding processes:

Welding Process employed



Shielded Metal-Arc welding – SMAW


Submerged-Arc Welding – SAW


Subm.-Arc Weld. with strips – SAW STRIP


SAW Double Wire – SAW Tandem


Gas Metal-Arc Welding – GMAW



Gas Tungsten-Arc Welding – GTAW



Flux-Cord Arc Welding – FCAW



Electro Slag Welding – ESW


Plasma-Arc Welding – PAW


The full knowledge and the familiarity with all the existing design codes such as ASME, BS 5500, CODAP, Stoomwelzen, AD Merkblatt and GOST allow us to develop the best design from the mechanical point of view. Furthermore, the in-house presence of FEM experts, together with the several ANSYS licenses, make the Finite Element Analysis a powerful instrument in our hands, for the design of critical parts of the equipment.

In addition to the mechanical design, Maraldi has strong skills in the development of the thermal and fluid-dynamic design starting from Process Data Sheets, ensuring all the required guarantees to our customers.

Our design activities include:
• 3D simulations
• Stress analysis by finite elements methods
• Fracture mechanics analysis
• Static analysis in steady and unsteady conditions
• Fatigue analysis
• Creep fatigue damage evaluation
• Thermo-hydraulic design of heat transfer systems

Design codes and standards

ASME I ASME III Ed.2007 Add. 2009 ASME VIII Div.1 latest edition
ASME VIII Div.2 latest edition ASME VIII Div.3 latest edition API 620/625/650/653/2000
AD Merkblatt 2000 VSR STOOMWEZEN
SELO API 579 – 1 ASME FFS-1 PD 5500
IBC 2006 UBC 97 ABSA
ASCE / SEI 7-05 BS 7910-2005 EJMA 9TH Ed.
EN 1405 ASME B 16.5 ASME B 16.47
API STD 6A API 934 – 941 NACE MR 0175/ ISO 15156-3
RCC-M e RCC-MR – nuclear sector EUR (European Utility Requirements) – nuclear sector ABSA

Main Design Softwares

Finglow: PD5500 pressure vessels calculation software
Solid Edge: 3D drawing calculation software
Pro ENGINEER: parametric 3D drawing program
CATIA V5 R20: 3D drawing program
ANSYS: finite element analysis and CFD analysis
ASPEN Shell & Tube Exchanger Design Rating Software
Aspen Exchanger Mechanical Design Software
Sant’Ambrogio: mechanical calculation software for VSR, ASME VIII
Div. 1 + EJMA expansion joints module
ASME VIII Div. 2, AD 2000 Merkblatt + expansion joints module, WRC 107/297
AUTO CAD AUTODESK: 2D drawing program

Metrology softwares

New River Kinematics: Spatial Analyzer
Innovmetric: Polyworks
Hexagon: Emscon, Tracker Pilot, RDS
Aberlink: 3D MKIII