On 31/03/2025 07:22, Chris Green wrote:
I've been doing some work in the galley on my little boat and then
wondered about why the kitchen and utility room sinks at home have
traps. On the boat the 'grey water' simply goes straight out of a
hole in the side with no trap.
All the domestic sink wastes I've ever come across simply have an
open ended pipe that discharges into a grid, usually shared with the
gutters. So why do they have traps? They're not connected directly
into the sewers.
In some cases they do connect directly into the soil /sewage pipe.
Even if to an open ended pipe the open nearby drain may still be a bit
smelly
On 31/03/2025 08:58, Timatmarford wrote:
On 31/03/2025 07:22, Chris Green wrote:
I've been doing some work in the galley on my little boat and then
wondered about why the kitchen and utility room sinks at home have
traps. On the boat the 'grey water' simply goes straight out of a
hole in the side with no trap.
I suppose you don't get sewer smells finding a way back to your galley
from a canal/river:-)
The grate thing has a trap itself
All the domestic sink wastes I've ever come across simply have an
open ended pipe that discharges into a grid, usually shared with the
gutters. So why do they have traps? They're not connected directly
into the sewers.
And there is one reason why sewage treatment plant is overwhelmed
every time we have persistent rainfall! Much more convenient for
housebuilders than soaks.
Illegal to have shared gutters and sewage in new builds
On 31/03/2025 10:37, No mail wrote:
Chris Green wrote:
I've been doing some work in the galley on my little boat and thenTo stop smells, primarily, because domestic waste water frequently
wondered about why the kitchen and utility room sinks at home have
traps. On the boat the 'grey water' simply goes straight out of a
hole in the side with no trap.
All the domestic sink wastes I've ever come across simply have an
open ended pipe that discharges into a grid, usually shared with the
gutters. So why do they have traps? They're not connected directly
into the sewers.
discharges into foul drainage. A trap will also stop insects.
It's not correct to say that rainwater and waste water are mixed. They
are supposed to be separated to prevent rainwater from overloading the
sewers.
While it is standard practice for anything new build, there are plenty
of Victorian era properties with combined sewers that take black and
grey water.
Even if to an open ended pipe the open nearby drain may still be a bit
smelly
Even if not smelly, it stops a draft blowing out the plug hole - this
closing another air leak between inside and outside.
Chris Green <cl@isbd.net> wrote:
I've been doing some work in the galley on my little boat and then
wondered about why the kitchen and utility room sinks at home have
traps. On the boat the 'grey water' simply goes straight out of a
hole in the side with no trap.
When you drop something dense down the sink it collects in the trap. That's likely saved many a wedding ring. It also prevent blockage further down - I retreived an electric toothbrush head that would have caused a more serious blockage in the waste pipe.
Chris Green wrote:
I've been doing some work in the galley on my little boat and then
wondered about why the kitchen and utility room sinks at home have
traps. On the boat the 'grey water' simply goes straight out of a
hole in the side with no trap.
All the domestic sink wastes I've ever come across simply have an
open ended pipe that discharges into a grid, usually shared with the gutters. So why do they have traps? They're not connected directly
into the sewers.
To stop smells, primarily, because domestic waste water frequently
discharges into foul drainage. A trap will also stop insects.
It's not correct to say that rainwater and waste water are mixed. They
are supposed to be separated to prevent rainwater from overloading the sewers.
On 31/03/2025 10:37, No mail wrote:
Chris Green wrote:
I've been doing some work in the galley on my little boat and thenTo stop smells, primarily, because domestic waste water frequently discharges into foul drainage. A trap will also stop insects.
wondered about why the kitchen and utility room sinks at home have
traps. On the boat the 'grey water' simply goes straight out of a
hole in the side with no trap.
All the domestic sink wastes I've ever come across simply have an
open ended pipe that discharges into a grid, usually shared with the
gutters. So why do they have traps? They're not connected directly
into the sewers.
It's not correct to say that rainwater and waste water are mixed. They
are supposed to be separated to prevent rainwater from overloading the sewers.
While it is standard practice for anything new build, there are plenty
of Victorian era properties with combined sewers that take black and
grey water.
John Rumm <see.my.signature@nowhere.null> wrote:
On 31/03/2025 10:37, No mail wrote:Not as far back as that, our 1920s/1930s house has everything going
Chris Green wrote:
I've been doing some work in the galley on my little boat and thenTo stop smells, primarily, because domestic waste water frequently
wondered about why the kitchen and utility room sinks at home have
traps. On the boat the 'grey water' simply goes straight out of a
hole in the side with no trap.
All the domestic sink wastes I've ever come across simply have an
open ended pipe that discharges into a grid, usually shared with the
gutters. So why do they have traps? They're not connected directly
into the sewers.
discharges into foul drainage. A trap will also stop insects.
It's not correct to say that rainwater and waste water are mixed. They
are supposed to be separated to prevent rainwater from overloading the
sewers.
While it is standard practice for anything new build, there are plenty
of Victorian era properties with combined sewers that take black and
grey water.
into the sewers.
On Mon, 31 Mar 2025 12:52:10 +0100, John Rumm
<see.my.signature@nowhere.null> wrote:
Even if to an open ended pipe the open nearby drain may still be a bit
smelly
Even if not smelly, it stops a draft blowing out the plug hole - this
closing another air leak between inside and outside.
Draught.
Insulates from cold air entering house, allowing that most people
won't be leaving their plugs in the plug hole.
Chris Green wrote:
I've been doing some work in the galley on my little boat and thenTo stop smells, primarily, because domestic waste water frequently
wondered about why the kitchen and utility room sinks at home have
traps. On the boat the 'grey water' simply goes straight out of a
hole in the side with no trap.
All the domestic sink wastes I've ever come across simply have an
open ended pipe that discharges into a grid, usually shared with the
gutters. So why do they have traps? They're not connected directly
into the sewers.
discharges into foul drainage. A trap will also stop insects.
It's not correct to say that rainwater and waste water are mixed. They
are supposed to be separated to prevent rainwater from overloading the sewers.
On Mon, 31 Mar 2025 12:52:10 +0100, John Rumm
<see.my.signature@nowhere.null> wrote:
Even if to an open ended pipe the open nearby drain may still be a bit
smelly
Even if not smelly, it stops a draft blowing out the plug hole - this
closing another air leak between inside and outside.
Draught.
Insulates from cold air entering house, allowing that most people
won't be leaving their plugs in the plug hole.
On 31/03/2025 17:08, Peter Johnson wrote:
On Mon, 31 Mar 2025 12:52:10 +0100, John Rumm
<see.my.signature@nowhere.null> wrote:
Even if to an open ended pipe the open nearby drain may still be a bit >>>> smelly
Even if not smelly, it stops a draft blowing out the plug hole - this
closing another air leak between inside and outside.
Draught.
Insulates from cold air entering house, allowing that most people
won't be leaving their plugs in the plug hole.
If I give you a red pen, could you do a squiggly underline as I type?
On 31/03/2025 17:08, Peter Johnson wrote:
On Mon, 31 Mar 2025 12:52:10 +0100, John Rumm
<see.my.signature@nowhere.null> wrote:
Even if to an open ended pipe the open nearby drain may still be a bit >>>> smelly
Even if not smelly, it stops a draft blowing out the plug hole - this
closing another air leak between inside and outside.
Draught.
Insulates from cold air entering house, allowing that most people
won't be leaving their plugs in the plug hole.
But then it would still come out of the overflow hole :)
On Mon, 31 Mar 2025 19:30:32 +0100, alan_m <junk@admac.myzen.co.uk>
wrote:
On 31/03/2025 17:08, Peter Johnson wrote:
On Mon, 31 Mar 2025 12:52:10 +0100, John Rumm
<see.my.signature@nowhere.null> wrote:
Even if to an open ended pipe the open nearby drain may still be a bit >>>>> smelly
Even if not smelly, it stops a draft blowing out the plug hole - this
closing another air leak between inside and outside.
Draught.
Insulates from cold air entering house, allowing that most people
won't be leaving their plugs in the plug hole.
But then it would still come out of the overflow hole :)
I'm not going to investigate the situation in the kitchen but in my
1st floor basins the overflow output is above the trap
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