Calculation for piping man-hour is a very complicated task. Many factors have to be considered to arrive at the correct amount of men hours for the installation of pipes, fittings, flanges, valves, supports, NDT....that will ensure the company will not lose money in the contract and met the required target completion date on implementation of the job.

A Piping estimator with its piping job site experience is required to have knowledge in productivity rates and norms regarding piping works so that he can do the job easily and without errors that may cause large money or job delays.

In piping estimating man-hour it is necessary for the piping estimator to know all the tasks and activities needed to complete the job.

We use a book about piping man-hour estimating which is very useful in knowing the correct man-hour productivity rates in almost all piping activities involved in piping fabrication and installation works.