When we receive an orifice or orifice tube for calibration, we clean the ID of the orifice plate before calibration. calibration of the orifice includes an 8-point calibartion to generate a flow equation of flow = $$c*\sqrt{dP}$$ where c is constant and dp is the pressure drop across the orifice.
Currently, the ORIFLOW lab can calibrate the following:

• orifice plates with an ID of 0.5 to 6 inches.
• orifice tubes with a diameter of 3 to 8 inches, containing an orifice ID from 0.5 to 6 inches.

If you have other requirements, call or fax us.