Utility sink drains slow then faster - What's going on?

[ShadySprings]

My utility sink next to washer drains real slow then seems to pick up speed as it drains for about a minute. Is there any meaning to this?
I've poured draino down but didn't do anything.
Thought I'd check here before I call the plumber out.
Thanks

 

[Mr_David]

I've seen a few sinks that do have a clear drain but tend to drain like yours.
Water will start spinning as it drains. That initial spin is not there so once it has a chance to develop it drains faster. I've taken my finger and actually accelerated the spin at the drain opening and the water would then drain out faster

 

[Fansplumbing]

Is it vented properly?

 

[ShadySprings]

Is it vented properly?

I'm actually suspecting that this may be related. How do you check?

 

[LiQuId]

it IS vented properly it drains, a blocked vent or no vent would cause the drain pupe to "gulp" just like a 2 litre pop bottle gulps if you pour it out fast ( invert the bottle and see the bubbles ), the vent in this example would be the equivilent now ( using the pop bottle example ) of poking a hole into to allow air into the bottle, a blocked vent will also cause the drain to smell really badly as it will syphon the p-trap ( the vent in THIS example is the equivilent to poking a hole into the syphon and breaking the syphon as air Can freely pass and is not drawn by the displacement of water )


So, its likely not a vent . I would surely not worry about this.

What mr david referrs to is called the "Corriolis effect" in essence, when more mass ( water ) is drawn into this effect that produces a low pressure zone ( the center of the swirl ) and is allowd to gain momentum it will draw faster and create a greater low pressure area.

Hope this helps

 

[LiQuId]

Ahh, here.... courtasy of google.

co·ri·o·lis ef·fect/ˌkôrēˈōləs/
Noun: An effect whereby a mass moving in a rotating system experiences a force perpendicular to the direction of motion and to the axis of rotation (influencing, for example, the formation of cyclonic weather systems).

 

[ShadySprings]

it IS vented properly it drains, a blocked vent or no vent would cause the drain pupe to "gulp" just like a 2 litre pop bottle gulps if you pour it out fast ( invert the bottle and see the bubbles ), the vent in this example would be the equivilent now ( using the pop bottle example ) of poking a hole into to allow air into the bottle, a blocked vent will also cause the drain to smell really badly as it will syphon the p-trap ( the vent in THIS example is the equivilent to poking a hole into the syphon and breaking the syphon as air Can freely pass and is not drawn by the displacement of water )


So, its likely not a vent . I would surely not worry about this.

What mr david referrs to is called the "Corriolis effect" in essence, when more mass ( water ) is drawn into this effect that produces a low pressure zone ( the center of the swirl ) and is allowd to gain momentum it will draw faster and create a greater low pressure area.

Hope this helps

Thanks,it does both. Sometimes it gulps and it seems like its having a hard time getting down the drain.
Is the only access to vent from the roof down?

 

[LiQuId]

fill the fixture completelly and then pull the plug, if it "gulps" then it COuld be a vent issue. if so then I would ikely install a Auto air vent on the branch as The vent is likely not accessiblle.

The real question is " does theis draining affect you in an adverse way " ?

if No then i wouldnt stress it .