What is one item required in a shop for safe operations during hydrostatic testing?

The correct choice regarding the required item in a shop for safe operations during hydrostatic testing is a fire extinguisher. During hydrostatic testing, high-pressure fluids are often used, which can potentially leak or cause bursts, leading to hazardous situations. A fire extinguisher is crucial for addressing any fires that could arise from flammable materials or equipment involved in the testing process.

Having a fire extinguisher readily available ensures that workers can rapidly respond to and control small fires, significantly enhancing workplace safety. Effective emergency preparedness is essential in settings where high-pressure testing occurs, making the presence of a fire extinguisher a non-negotiable requirement in compliance with safety regulations.

In contrast, while items such as a navy blue tarp, a janitorial closet, or a safety manual may have their uses, they do not directly contribute to immediate safety in the context of emergency response during hydrostatic testing, highlighting why they are not suitable choices in this scenario.