speedball1
Mar 22, 2012, 01:38 PM
RickJ answered this back in 08. In the United States, "Schedule" refers to the thickness of the pipe wall and, therefore, how much pressure it will hold. In most aquaculture applications, Schedule 40 is used because:
1. It works for most applications and is readily available.
2. In small quantities, it is only slightly more expensive than the thinner wall Schedule 120.
3. The wall is thick enough so that it will not distort when walked on.
4. From 1/2" to 2", it is rated at no less than 140 psi at 73°F. The highest pressure typically found at any facility is 65 psi, which is the average city water supply.
Schedule 80 is rated at no less than 200 psi at 73°F (up to 2") and is usually gray (similar to the Schedule 40 pipe used for electrical conduit).
Does this answer your question? Tom