New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

Which pressure ratings are NOT available for cast iron flanges?

1. 300 and 600

2. 150 and 400

3. 125, 250, and 800

4. 1500

The correct answer is: 125, 250, and 800

The pressure ratings for cast iron flanges typically fall within certain standard ranges defined by industry specifications. The correct answer indicates that the pressure ratings of 125, 250, and 800 are not available for cast iron flanges, which is consistent with the manufacturing standards observed in the industry. Cast iron flanges often come in ratings such as 150, 300, and 600, which align with the commonly accepted standards for various applications. Higher pressure ratings such as 1500 exceed the capabilities of cast iron materials, as they are more suitable for stronger metals like steel. Therefore, the absence of ratings like 125, 250, and 800 in cast iron flanges reflects the material limitations and emphasizes the typical use cases of these flanges, which generally focus on moderate pressure environments. The selection of material and its corresponding pressure rating plays a crucial role in ensuring the reliability and safety of piping systems.