I am new to the forums here and I have a few questions in regards to DWV.
I am building a new house in Will County Illinois. In this juridisdiction we use The Illinois Plumbing Code.
The house is a 80ft wide 2500 sqft ranch on the Main Level and approx. 1500 sqft in the walk out basement.
I am on septic and well and I will be using a sewage ejector basin to lift the sewage up to the 4" Main Drain that connects to the septic.
There is no mention through out the code in regards to venting the basin as except to say
Section 890.1360 Sanitary Wastes Below Sewer
1) Sanitary wastes which cannot be discharged by gravity flow shall be discharged into a gas-tight, covered and vented sump from which the waste shall be lifted and discharged into a sanitary waste drain by automatic pumping equipment.
2) e Vent Sizes. Building sump vents shall be sized in accordance with Appendix A: Table K. Appendix J: Illustrations K and L.)
QUESTION1: CAN I CONNECT VENT OF THE EJECTOR BASIN TO THE VENT AS A BRANCH VENT LEADING OUT TO THE VENT STACK OR DOES IT HAVE TO BE VENTED ON ITS OWN THROUGH THE ROOF. THIS IS A LITTLE VAGUE. AS I READ THE CODE I SHOULD BE ABLE TO CONNECT TO THE VENTING SYSTEM OF THE HOUSE
Thats all the questions I need in regards to the sewage ejector or the basement rough-in.
In regards to the main stack venting I have some questions:
The codes states:
Section 890.1420 Stack Vents, Vent Stacks, Main Vents
Main Stack. Each building in which plumbing is installed shall have at least one main vent stack no smaller than three (3) inches for each building drain installed. (See Appendix A: Table K, and Appendix K: Illustration C.) Section 890.1560 Main Vents to Connect at Base
It also states;
Main Vents. All main vents or vent stacks shall connect full size at their base to the building drain or to the main soil or waste pipe, at or below the lowest fixture branch. All vent pipes shall extend undiminished in size through the roof to the outside atmosphere, or shall be reconnected with the main soil or waste vent. (See Appendix K: Illustration EE.)
and in regards to sizing it states:
Section 890.1580 Size and Length of Vents
a) Size of Water Closet Vents. A water closet shall have at least a 2 inch vent.
b) Size of Individual Vents. The diameter of an individual vent shall be at least 1¼ inches or at least ½ the diameter of the drain to which it connects, whichever is greater.
c) Size of Relief Vents. The diameter of a relief vent shall be at least ½ the diameter of the soil or waste branch to which it is connected.
d) Size of Circuit Vents. The diameter of a circuit vent shall be at least ½ the diameter of the horizontal soil or waste branch or the diameter of the vent stack, whichever is smaller. (See Appendix A: Table L.)
e) Size of Vent Piping. The size of vent piping shall be determined based upon its length and the total number of drainage fixture units connected thereto as provided in Appendix A: Table K. No more than 20 percent of the maximum developed length as determined from Table K may be installed in the horizontal position. Vent piping serving floor drains shall be installed in such a manner as to minimize horizontal vent distances.
Section 890.TABLE J Size of Vent Stacks
Number of Bathroom Groups
Diameter of Vent Stacks (Inches)
1 or 2
3 to 9
10 to 16
QUESTION2: Since I have only three bathroom groups in the house and only 27 DFU's(38 including the basement bath)can I run a 3" Main vent undiminished from the 4" Main Drain up through the roof.
I believe I have a good handle on fittings to be used in the vertical/horizontal positions. So this should be it for right now
I have attached a pics which includes a basic layout of the plumbing DWV as well as an isometric(THIS IS THE FIRST ONE I HAVE EVER DONE. Ii HAVE DONE PLENTY OF HVAC DIAGRAMS AND SIZING) so hopfully it is readable.
Thanks for any input.
Here is a link to the Illinois Plumbing code if you would like: