1/8 per ft
1/8" per foot.
The minimum gradient for a 9-inch foul pipe, which is typically used for wastewater, is generally recommended to be at least 1% to 2% (1/8 inch to 1/4 inch per foot). This ensures proper flow and prevents blockages. However, local codes and specific conditions may dictate different requirements, so it's essential to consult relevant regulations or guidelines for your area.
Absolutely NOT you 2" minimum
Pipe bore is the actual minimum inside diameter of a pipe, which is not necessarily the nominal pipe size.
It depends on the pipe schedule and diameter... For example. Schedule 40 1 Inch pipe has a minimum burst pressure pressure rating of 1440PSI and an operational PSI of 270. Google can provide a complete chart. Just search "PVC Pipes - Pressure Ratings"
1/8 inch fall for every foot of run is the ICC code minimum, but I would prefer 1/4 inch fall.
1/8" per foot.
The minimum fall allowed for a 150mm foul pipe is typically around 1 in 40, which translates to a slope of approximately 2.5%. This ensures proper drainage and prevents blockages. However, local building codes and regulations should always be consulted, as they may have specific requirements that differ from general recommendations.
The minimum fall for a 225mm foul drainage pipe is typically around 1 in 40, which translates to a gradient of 2.5%. This ensures adequate flow and prevents blockages by allowing gravity to assist in the movement of wastewater. However, local regulations and specific installation conditions may influence this requirement, so it's essential to consult relevant codes or guidelines.
From various sources I gathered that the minimum fall (slope) is 1cm fall over 1m distance. Converted that is 0.125 (1 eighth) inch fall over 1 foot distance.The maximum that should not be exceeded is 1cm fall over 20cm distance. Converted that is 0.25 (1 quarter) inch fall over 4 foot distance.
Absolutely NOT you 2" minimum
1-1/2 inch drain for above grade and 2 inch drain for below grade. Most UPC-based codes (IAPMO) require 2 inch above and below grade.
It really depends on your local building code, but 2% should be the minimum so that your pipe will be self-cleaning.
1/8" to 1/4" inch per foot.
For proper fall. Pipe should slope 1" for every 8'.
Foul Air
The outlet pipe needs to be a minimum of two inches and then expanding to the four inch main line