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Default Trap versus "S" Bend

In an earlier contribution to this discussion,
Frank big@hole wrote:

Can a bathroom sink have an S Bend as apposed to a waste trap?

Apart from preventing smells coming up the pipe, is the traps main
function to collect anything that gets dropped down the sink and if
so then why does a bath not have this?

Cheers

Frank.


They both do the same job - provide a plug of water which prevents nasty
smells coming up to the sink/bath/basin/whatever from the sewer. A trap is
more compact, and takes up less horizontal space, in particular. Otherwise
it doesn't matter which you use. A lot of baths *do* have traps.

Modern plastic S-bends are often not very deep (their lead pre-decessors had
used to be a lot deeper). P-traps come in various depths. You sometimes need
a deep one if the waste pipe isn't adequately ventillated such that the
pressure can drop and suck the water out of the trap. Deeper traps offer
more resistance to this.
--
Cheers,
Set Square
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