How to Connect Sink, Dishwasher and Laundry Pump to One Drain Pipe?

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Old 03-05-14, 08:49 AM
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How to Connect Sink, Dishwasher and Laundry Pump to One Drain Pipe?

My drain pipe in my unfinished basement is close to the ceiling which makes it hard to change things. I know that the drain in my basement is wrong right now and I am trying to fix it. I only have one attachment of ABS (1 1/2") to the main cast iron drain pipe and adding another one isn't really an option. I have a kitchen sink with a dishwasher attached to it and a basement laundry tub pump that all needs to be attached to the same drain. The laundry tub pump says that it does not need to be vented or have a trap. I have posted pictures of two options that I am thinking of. What is the best way to do this? Thanks for the help.

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Old 03-05-14, 10:21 AM
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Welcome.......

I would say pic #2... Is the kitchen sink vented?

What model laundry pump are you getting that does not need a vent?

If the upstairs kitchen sink is not vented then you will have issues with trap siphoning when the laundry pump drains...
 
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Old 03-05-14, 10:38 AM
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Thanks Lawrosa,

This is the laundry tub pump I am thinking of getting FPUS1860A-01

The kitchen sink is not vented but the trap is close enough the the main vertical drain that the main vertical drain is the vent. I believe that it can be up to 5 feet away from the vent.

I realize that in pic #2 water siphoning out of the trap might be an issue but wouldn't the configuration in pic #1 eliminate that problem?
 
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Old 03-05-14, 11:23 AM
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The kitchen sink is not vented but the trap is close enough the the main vertical drain that the main vertical drain is the vent. I believe that it can be up to 5 feet away from the vent.
If its a dry vent... What flows in that vent from upstairs? As far as U.S. codes thats a wet vent then and not allowed...

Additionally a backwater valve is needed for the laundry sink...
 
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Old 03-05-14, 11:48 AM
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There is a bathroom on the second floor so yes it would make it a wet vent.
 
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Old 03-05-14, 01:05 PM
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Wet vents are not to code... Your whole plan is not to code from a U.S. stand point. Dont know what codes you follow but probably similar...
 
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Old 03-05-14, 01:29 PM
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Yes, I did realize that it is not to code. It is a 104 year old house so lots of things aren't to current codes. The only way to get it to code is to cut my cast iron drain pipe at the bottom and add a new attachment to it for a larger ABS pipe and add vents from my basement fixtures all the way up to my attic. Maybe an air admittance valve could be added somewhere but it would still be difficult. Doing all of that doesn't seem practical.

Any other ideas?

I really appreciate the help I am getting.
 
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