Buried gas pipelines are one of the most important tools for transmission of energy. Pigging of pipeline is a routine activity foe cleaning the pipes internal . But determine of time foe pigging is not simple. there are many variables that affect on and operators usually have problem with.
In this research a new model for buried gas pipeline is obtained. The base of new software is the Fuzzy analytic hierarchy process (FAHP) technique .about 4000 kilometer of Iran gas pipeline test with the new software and the result shows it is efficient and ثببثزفهرث.”