What are temperature effects on leak testing?
Temperature effect has the following symptoms: • Temperature changes air temperature, gas density and pressure based on the “Ideal Gas Law” and “gas density” (Link to other questions). Note that temperature is an average temperature measured in absolute units (0.2° F temperature change at 70° F or 530° F is only 0.038% density change). Also note that air is an excellent temperature insulator. • Temperature affects some parts’ leak tightness. Casting pore sizes increase with temperature, rubber and plastic change properties with temperature, etc. • Rapid temperature changes cause unit under test volume to change and be unstable and possibly bias leak flow into or from the part.
