RusPC wrote:

Our washer in the basement discharges into twin wash tubs. When this happens we
hear loud gurgling in the sink drain upstairs in the kitchen. They share a
common drain pipe to the sewer line. Any suggestions about what can be done to
stop the noise?

Russ

Now this one *is* a venting problem:-)
Either the wash tubs were tapped in improperly or the vent for the
kitchen sink is blocked.

Without a working vent, the flow of water from the tubs creates
a vacuum which tries to suck the water out of the kitchen trap.

It's even possible that there never was any vent; this type of
connection was common in some parts of the country for kitchen sinks.

The best (easiest) fix in this situation may turn out to be the
addition of a mechanical vent just downstream of the kitchen trap.
How you do that depends on the layout, etc.

Here's one:
http://www.studor.com/index.htm

Mo
http://www.plumbingsupply.com/autovent.html

Note that this type of vent may be prohibited where you live (if it
matters).

Jim