NEIEP Mechanics Practice Exam

Schedule 80 pipe is commonly referred to as "extra strong wall pipe." This designation is important as it indicates that Schedule 80 pipe has a thicker wall compared to Schedule 40 pipe, making it suitable for high-pressure applications. The thicker wall lends added strength, which is essential when the pipe is expected to carry substances under higher pressures or varying temperatures.

In contrast, the term "standard wall pipe," can refer to Schedule 40, which has a thinner wall and is not as strong under pressure. The designation "heavy duty pipe" is somewhat misleading because it does not specifically refer to Schedule 80 and could be interpreted in various ways depending on the application. "Lightweight pipe" implies a focus on reduced material and weight, which is the opposite of what Schedule 80 represents, as it is heavier due to its thicker walls. Thus, "extra strong wall pipe" accurately describes the nature and application of Schedule 80 pipe.