MCC-NH Gas Fitters Practice Exam

What action should be taken for black iron piping installed outdoors above ground?

1. Replace it with PVC

2. Wrap it in insulation

3. Paint it

4. Leave it untreated

The correct answer is: Paint it

In outdoor installations, black iron piping is susceptible to corrosion due to exposure to environmental elements such as moisture, air, and temperature fluctuations. Painting the black iron piping serves a dual purpose: it creates a protective barrier against corrosive elements and enhances its lifespan by preventing rust formation. The paint used should be specifically formulated for metal surfaces to ensure proper adhesion and protection. Replacing black iron piping with PVC is not necessary unless there are specific compatibility issues or regulatory requirements that mandate a different material. Wrapping the piping in insulation can provide some level of protection, but it is not as effective in preventing corrosion as applying a coat of paint meant for outdoor use. Leaving black iron untreated exposes it directly to the elements, which can lead to rapid deterioration and eventual piping failure. Therefore, painting is the most effective means of ensuring the longevity and integrity of black iron piping installed outdoors.