Pitch of 1.5in ABS for Kitchen Drain

IM using 1.5 inch ABS to replace my old rotted galvanized drain.
I have a straight section that runs in my basement to the tune of about 16 feet
How do you properly pitch this stuff? How many inches per how many feet?
Right now i have about 2 inches of pitch for then entire run and at the end....near the main drain pipe for the house......there is a 45 degree or two that hooks it to the main drain pipe (this section is about 3 -4 feet in length with this desin
))))))))))))))))/ /))))))))))))/
/ (MAIN DRAIN Galvanized at 45 degree here and then runs into the Cast iron)
Can i get away with this or do i need to have more of a pitch than 2 inches for that long run?
Any feed back is well appreciated. Im wanting to get this thing together today :)
I dont know if the drawing makes sense or not but basically i have two 45 degree sections that lead to the main cast iron drain for the house.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

In the trade, 1/4" per foot is considered optimal, you can get away with a little less.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

You should have 1/4" per foot of grade as mentioned. That would be 4" for 16'. Once you get to 4" pipe you can go 1/8" per foot . ( this is the code in my area ) Bu if you have two given points that's what you have for slope. If you get more grade by changing the 45 degree that what you should do. Also keep in mind if you have to much grade the water will pass the solids. What is the drain for? If it's just a bathroom Lave or shower I would just try the 2" grade and see what happens, no deferent than before right.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Thanks for the reply. This is for my kitchen sink. It is on the oppisite side of the house as my main chute. I have about 2 inches right now and it seems to work fine but it is hard to say how it will act in the future. I could raise one end with hanger another inch or 2 to increase the pitch i guess. I just dont want it to clog up again. Keep in mind that the old galvanized pipe was throughly clogged and mostly corroded and starting to rot. This wont be an issue with the abs. IM just hoping it will carry any solids that get down the drain. I dont have a disposal on the sink .....just a p trap.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.