Tier 4 Final air compressors are not the same machines simply repackaged with new engines. Additional technology and features have been incorporated to deliver better efficiency, more uptime and extra value on the jobsite.
PVC casing is inexpensive, reliable, never rusts and, used within limits, will make a lifetime well. However, PVC has one major drawback: It is not as strong as steel pipe.
If you are running conventional oilfield drill pipe, drilling deep with a mud rotary or perhaps drilling 5,000 feet for natural gas with flush joint drill pipe, then you are familiar with the term "upset."