Spanish to English Tech/Engineering Construction / Civil Engineering gas pipeline construction

From a Mexican procedure manual on gas pipeline construction, in a section on pipe bending:

"Para comprobar que no existe ovalización se hará el paso de una **platina** en todas las curvas de 2.5% del diámetro exterior para su aceptación."

Is a "platina" simply a kind of plate used to check for pipe ovalization? Suggestions welcomed!