thumb rule for the amount of manpower required per metric ton

 There is no definitive "thumb rule" for the amount of manpower required per metric ton of structural fabrication, as it can vary widely depending on a number of factors, such as the complexity of the design, the size and weight of the components, the type of fabrication methods being used, and the experience and skill level of the workers.

However, as a general guideline, it is common in the industry to use the following estimates for the amount of labor required per metric ton of steel fabricated:

• For light structural steel fabrication (up to 10 metric tons), an average of 20 to 30 labor-hours per metric ton may be required.

• For heavy structural steel fabrication (over 10 metric tons), an average of 40 to 50 labor-hours per metric ton may be required.

These estimates are intended as a rough guideline only, and the actual manpower required can vary widely based on the specific project requirements and the skills and efficiency of the workers involved.

There is no simple thumb rule for determining the amount of manpower required for structural fabrication, as it depends on a variety of factors such as the complexity of the design, the type of materials being used, the fabrication processes involved, and the experience and skill level of the workers.

However, as a general guideline, a skilled fabrication worker can typically produce between 2 to 4 metric tons (MT) of structural steel per month, depending on the complexity of the design and the fabrication processes involved. This can be used as a starting point for estimating the amount of manpower required for a given project.

Other factors that may affect the amount of manpower required include the availability of equipment and tools, the working conditions (e.g. temperature, humidity, and ventilation), and the level of coordination and communication among the workers.

It's important to carefully analyze the specific requirements of each project and to work with experienced professionals in order to accurately estimate the amount of manpower required for successful completion of the project.