Most of the construction activities, such as earthwork, foundations, process electrical and control tie-ins to existing items, can occur while the boiler is in operation.
One the boiler is operational other construction activities can be completed.
In the Indus river valley, improved techniques permitted the storage of wheat and barley beyond daily needs, and so the cities of Harappa and Mohenjodaro emerged in the year 2300 b.c. , creating a civilization even more advanced than that of the Aryans who came later.