ᐅ Is it possible to detect the route of gas pipes installed within the walls?

In an older apartment that has been renovated several times in the past, gas pipes are installed under the plaster or inside shafts.

Is there a reliable way to determine their route?

There are detectors for water pipes and electrical cables.

Do those also work reliably for gas pipelines?

Tobias

The detectors for electrical cables that I am familiar with work reliably with metal. What material are the gas pipes made of?