New York Low Pressure Boiler COF Practice

Up to what pressure can a fitting of iron, containing 95% copper, be hydro tested?

1. 100 psi

2. 300 psi

3. 600 psi

4. 900 psi

The correct answer is: 600 psi

The proper answer is based on the pressure limits established for fittings made predominantly of copper or copper alloys. In this scenario, the fitting in question, composed of 95% copper, is largely within the parameters set for copper materials. Copper fittings are often tested to a higher standard due to their durability and resistance to corrosion. The general guideline for hydrostatic testing of copper or bronze fittings indicates they can typically withstand pressures much higher than standard iron fittings, making 600 psi a fitting answer. When conducting a hydrostatic test, the material's tensile strength and ductility assist in determining the maximum test pressure. Since the iron fitting here is primarily copper, which can handle high pressures without compromising safety, testing it to 600 psi is compliant with established safety regulations and material capabilities. Fittings made of iron or other materials typically have lower testing limits, which is why they do not align with the more robust capabilities of this copper-based fitting.