Further to my post..."Toilets..for Gods sake help"

[Guest]

Well you can always rely on a loo thread to go on .... and ... on!

Why such obsession?

I wasn't going to get sucked in ? but just a quick word re pump outs.

My tank (my design) has a sloping base and is shaped to use a space that otherwise would have been inaccessible.

Loo and flush at top end. P.O. at other. Never have anything left in tank after a P.O!

26 years on and base is still clear.

Yes it is under bed and still allows drawers that could not be any bigger.

Oh yes and I did get iced in while living aboard, but the tank is so big it was never an issue!

Any other problem??

 

[Bobbybass]

18 hours ago, Mike the Boilerman said:

 

Which needs specifically needs a backsyphon prevention device to comply with the water regulations....

 

 

OK...

 

So that red non-return connector won't do ?

[Boater Sam]

1 hour ago, Bobbybass said:

OK...

 

So that red non-return connector won't do ?

Is it a non return or just a red joiner?

Er, a double non return is actually what is required like a sealed system fill loop has. No one will know if you don't tell them or poison them.

[Alan de Enfield]

WRAS

Water Regulations Advisory Service

 

Information for Operating
Plumbing Systems for
the Supply of Water for
Domestic Purposes to
Boats in Marinas

 

 

Scope
The specific aim of this Information and Guidance
Note is to prevent contamination of drinking water
supplies. Other aspects of complying with the
regulations, such as notification of the installation
or alteration of plumbing systems, are not covered
in this Note, but information is available in the Water
Regulations Guide and on the WRAS website (see
Section 9 'Further Information').
Serious contamination of water supplies can occur
by backflow or cross connection with other sources
of water.
Backflow means the flow of water in a direction
opposite to the intended normal direction and can
occur either by:
backpressure – where the water in the plumbing
system is subjected to a greater pressure at a
‘downstream’ point than that upstream, allowing
it to flow backwards, or by
backsiphonage – where the downstream end of a
pipe or device is only at atmospheric pressure,
but the pressure upstream is less, effectively
sucking water back upstream.
Backflow is particularly relevant when considering
the use and storage of hosepipes and access
to them. Backflow could cause drinking water

supplies on boats, elsewhere in the marina or in the
surrounding neighbourhood to be contaminated with
toxic chemicals or disease-causing micro-organisms
(bacteria or viruses) from other water e.g. sewage,
puddles, river or sea water. There have been a number
of incidents in the United Kingdom where the public
water supply has been contaminated due to backflow
at marinas. A common cause is hosepipes being left
submerged in river or seawater.

 

5. Backflow Prevention
The seriousness of the risk of contamination by
backflow is assessed using one of five fluid categories.
Examples of these include:
Fluid category 5: contaminants, which are a
serious health risk. Fluid containing pathogenic
organisms, radioactive or very toxic substances.
Fluid category 4: contaminants with a significant
health hazard. Fluid containing toxic substances
including chemicals, carcinogenic substances,
pesticides and environmental organisms of
potential health significance.
Fluid category 1: wholesome drinking water,
as supplied by the Water Supplier.
The degree of backflow risk is dependent on local
circumstances. Risk assessments, if not carried out by
your local water supplier, should be confirmed by it.
The regulations require that plumbing systems, fittings
and appliances are protected by suitable backflow
prevention devices rated to provide protection to at
least the same fluid category as indicated by the risk
assessment. The Water Regulations Guide provides
information on the fluid category rating of different
types of backflow device.

Edited April 29, 2019 by Alan de Enfield

[Bobbybass]

9 minutes ago, Alan de Enfield said:

WRAS

Water Regulations Advisory Service

 

Information for Operating
Plumbing Systems for
the Supply of Water for
Domestic Purposes to
Boats in Marinas

 

 

Scope
The specific aim of this Information and Guidance
Note is to prevent contamination of drinking water
supplies. Other aspects of complying with the
regulations, such as notification of the installation
or alteration of plumbing systems, are not covered
in this Note, but information is available in the Water
Regulations Guide and on the WRAS website (see
Section 9 'Further Information').
Serious contamination of water supplies can occur
by backflow or cross connection with other sources
of water.
Backflow means the flow of water in a direction
opposite to the intended normal direction and can
occur either by:
backpressure – where the water in the plumbing
system is subjected to a greater pressure at a
‘downstream’ point than that upstream, allowing
it to flow backwards, or by
backsiphonage – where the downstream end of a
pipe or device is only at atmospheric pressure,
but the pressure upstream is less, effectively
sucking water back upstream.
Backflow is particularly relevant when considering
the use and storage of hosepipes and access
to them. Backflow could cause drinking water

supplies on boats, elsewhere in the marina or in the
surrounding neighbourhood to be contaminated with
toxic chemicals or disease-causing micro-organisms
(bacteria or viruses) from other water e.g. sewage,
puddles, river or sea water. There have been a number
of incidents in the United Kingdom where the public
water supply has been contaminated due to backflow
at marinas. A common cause is hosepipes being left
submerged in river or seawater.

 

5. Backflow Prevention
The seriousness of the risk of contamination by
backflow is assessed using one of five fluid categories.
Examples of these include:
Fluid category 5: contaminants, which are a
serious health risk. Fluid containing pathogenic
organisms, radioactive or very toxic substances.
Fluid category 4: contaminants with a significant
health hazard. Fluid containing toxic substances
including chemicals, carcinogenic substances,
pesticides and environmental organisms of
potential health significance.
Fluid category 1: wholesome drinking water,
as supplied by the Water Supplier.
The degree of backflow risk is dependent on local
circumstances. Risk assessments, if not carried out by
your local water supplier, should be confirmed by it.
The regulations require that plumbing systems, fittings
and appliances are protected by suitable backflow
prevention devices rated to provide protection to at
least the same fluid category as indicated by the risk
assessment. The Water Regulations Guide provides
information on the fluid category rating of different
types of backflow device.

So… several marinas that I have visited...who have their rinse hose attached directly to a standard tap....that is linked to the stand pipes for marina boats.....are breaking the law..?

[Alan de Enfield]

17 minutes ago, Bobbybass said:

So… several marinas that I have visited...who have their rinse hose attached directly to a standard tap....that is linked to the stand pipes for marina boats.....are breaking the law..?

Probably not - they will (should) have a non-return valve fitted into the tap.

 

 

[Alan de Enfield]

20 minutes ago, Bobbybass said:

So… several marinas that I have visited...who have their rinse hose attached directly to a standard tap....that is linked to the stand pipes for marina boats.....are breaking the law..?

Filling your boat tank from a 'mains tap'.

 

Alternative using a mains-fed hose union tap
Subject to the terms and conditions required by the
Water Supplier, and with its consent, an alternative
arrangement for filling boats’ water tanks is a mains-fed
hose union tap. The hose tap must be installed with
an in-line double check valve (type EC or ED device) and
be protected against damage by freezing by insulation
or other means (see Figure 2). A method statement for
the inspection, maintenance or replacement of the
backflow device must be agreed with the Water Supplier
and implemented by the marina operator.
This arrangement is subject to the terms and
conditions of the local Water Supplier.

 

 

 

[Bobbybass]

1 hour ago, Alan de Enfield said:

Probably not - they will (should) have a non-return valve fitted into the tap.

 

 

So...not a problem then....as they will be pumping out....and my grossen boggen flushen wand....will be attached to their rinse hose.  Anyway...this has all been very interesting...but we should all give up on the subject now.   Bye.