Answer :
When welding a pipe in a deep trench, safety is crucial to protect oneself from potential hazards associated with the activity and environment. In addition to protective goggles, other personal protective equipment (PPE) is necessary:
Hard Hat: In a deep trench, there is always a risk of falling objects, especially if there are workers or equipment operating at higher levels. A hard hat protects the head from such hazards.
Respirator: Welding can produce fumes and gases that are harmful if inhaled. In a trench, these fumes may not dissipate quickly due to limited air circulation, increasing the risk of inhalation. A respirator helps protect the welder by filtering out these harmful substances.
Hearing Protection: Welding environments can be noisy due to equipment and other activities. Prolonged exposure to high noise levels can damage hearing, so adequate hearing protection like earplugs or earmuffs is important.
Although not explicitly required from the options, proper PPE for welding would also typically include welding gloves and flame-resistant clothing to protect against burns and sparks.
For the question asked, the most appropriate options would be a hard hat (2), a respirator (3), and hearing protection (4). These options align with the safety requirements of welding in a confined space like a trench.
