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● Leak testing of drinking water installations with compressed air in accord-
ance with information leaflet "Leak Testing of Drinking Water Installations" (January
2011) of the German Central Association for Sanitary, Heating and Air Conditioning
(ZVSHK) and pressure and leak testing of other pipe systems and vessels.
● Load testing of drinking water installations with compressed air in accord-
ance with information leaflet "Leak Testing of Drinking Water Installations" (January
2011) of the German Central Association for Sanitary, Heating and Air Conditioning
(ZVSHK) and pressure and load testing of other pipe systems and vessels.
●
Hydrostatic pressure testing of drinking water installations with water in
accordance with EN 806-4:2010, Test Method A and for pressure and leak
testing of other pipe systems and vessels.
● Hydrostatic pressure testing of drinking water installations with water in
accordance with EN 806-4:2010, Test Method B.
●
Hydrostatic pressure testing of drinking water installations with water in
accordance with EN 806-4:2010, Test Method B, modified in accordance with
information leaflet T 82-2011 "Leak Testing of Drinking Water Installations" of the
German Central Association for Sanitary, Heating and Air Conditioning and
pressure and leak testing of other pipe systems and vessels.
●
Hydrostatic pressure testing of drinking water installations with water in
accordance with EN 806-4:2010, Test Method C and for pressure and leak
testing of other pipe systems and vessels.
● Compressed air pump for controlled filling of all types of vessels with compressed
air ≤ 0.8 MPa/8 bar/116 psi,
●
Operation of compressed air tools up to an air requirements of ≤ 230 Nl/min
All other uses are not for the intended purpose and are therefore prohibited.
Attention: Use for the intended purpose also includes consideration and
observance of the national safety provisions, rules and regulations valid for
the application site, especially the following standards and rules of technology:
European standard EN 806-4:2010
Based on the currently valid European directive 98/83/EC "on the quality of water
for human consumption", the European standard EN 806-4:2010 "Specifications for
installations inside buildings conveying water for human consumption – Part 4:
Installation" was adopted by the European Committee for Standardisation (CEN) on
the 23rd of February 2010 and had to receive the status of a national standard in
all European countries by September 2010. This standard defines Europe-wide
regulations for the commissioning of drinking water installations, e.g. for filling,
pressure testing, flushing and disinfection for the first time.
Section 6 "Commissioning" of EN 806-4:2010 describes the "filling and hydrostatic
pressure testing of installations inside buildings for water for human consumption"
under 6.1. "Installations inside buildings must be subjected to pressure testing. This
can be done either with water or, if national regulations allow, oil-free, clean air with
low pressure or inert gases may be used. The possible risk from high gas or air
pressure in the system must be considered." However, the standard EN 806-4:2010
contains no test criteria at all for testing with air apart from this note.
Sub-sections to 6.1 offer 3 test methods A, B, C for hydrostatic pressure testing
depending on the material and size of the installed pipes The test methods A, B and
C differ in different test sequences, pressures and times.
Section 6.2 "Flushing the pipes" defines under 6.2.1: "The drinking water installation
must be flushed with drinking water after installation and pressure testing as well
as immediately before commissioning." "If a system is not put into operation imme-
diately after commissioning, it must be flushed at regular intervals (up to 7 days)."
Pressure testing with compressed air is recommended if this demand cannot be
fulfilled.
Section 6.2.2. describes "flushing with water".
In section 6.2.3 "Flushing method with a water/air mixture" is described whereby the
flushing effect is reinforced by manually or automatically generated compressed air
surges.
Section 6.3 "Disinfection" points out in 6.3.1 that no disinfection is necessary in many
cases but that flushing is sufficient. "However, drinking water installations may be
disinfected after flushing is a responsible person or authority prescribes this." "All
disinfections must be carried out in accordance with national or local regulations."
Section 6.3.2 "Selection of the disinfectant" states that: "All chemicals that are used
for the disinfection of drinking water installations must meet the requirements for
chemicals for water treatment which are specified in European standards or, if
European standards are not applicable, in national standards." Moreover: "Transport,
storage, handling and use of all these disinfectants can be dangerous, therefore
health and safety requirements must be strictly observed."
Section 6.3.3 "Procedure for the use of disinfectants" states that the specifications
of the disinfectant manufacturer must be observed and that a sample must be tested
bacteriologically after successful disinfection and subsequent flushing. Finally it is
demanded that: "A full record of the details of the entire procedure and the test
results must be compiled and submitted to the owner of the building."
Information leaflet "Leak tests of drinking water installations with compressed
air, inert gas or water" (January 2011) of the German Central Association for
Sanitary, Heating and Air Conditioning (ZVSHK)
For Germany this information leaflet defines under "3.1 General" for the national
regulations: "Due to the compressibility of gases, the rules for the prevention of
accidents "Working on Gas Systems" and the "Technical Rules for Gas Installations
DVGW-TRGI" must be observed for physical and safety reasons when conducting
pressure tests with air Therefore, the test pressures have been defined as maximum
0.3 MPa (3 bar), the same as for load and leak tests for gas pipes, in agreement
with the responsible industrial liability insurance association and based on these
rules. The national regulations are thereby fulfilled.“
With regard to the test methods A, B and C offered in section 6.1 of EN 806-4:2010
for pressure testing with water, information leaflet "Leak tests of drinking water
installations with compressed air, inert gas or water" (January 2011) T 82-2011 of
the German Central Association for Sanitary, Heating and Air Conditioning (ZVSHK),
defines the following for Germany: "For reasons of practicability on the building site,
a modified method based on practical tests which can be used for all materials and
combinations of materials was chosen. The test time has been extended in relation
to the time specified in the standard to allow even the slightest leaks to be detected.
Test method B in accordance with DIN EN 806-4 is the basis for conducting the leak
test with water for all materials."
The following is defined:
Leak test with inert gases (e.g. nitrogen)
"In buildings with enhanced hygiene requirements such as medical facilities, hospi-
tals, doctors' practices, the use of inert gases may be required to rule out conden-
sation of the moisture in the pipe."
Leak testing with compressed air is to be conducted when
● a longer standstill time between the leak test and commissioning, especially at
average ambient temperatures > 25°C, is to be expected to rule out possible
bacterial growth,
● the pipe system cannot remain completely full from the leak test to commissioning,
e.g. during a frost period,
● the corrosion resistance of a material in a partially drained line is endangered
Leak testing with water can be conducted when
● changing of the water can be ensured at regular intervals, after seven days at
the latest, from the time of the leak test to commissioning of the drinking water
installation. Additionally when
● it is ensured that the house or building water connection is flushed and therefore
released for connection and operation,
● the pipe system is filled using totally hygienic components,
● the system remains full from the leak test to commissioning and partial filling can
be avoided.
Drinking water directive in the version of 2nd of August 2013, § 11
For Germany the drinking water directive in the version of the 2nd of August 2013 in
§ 11 "Treatment materials and disinfection methods" defines that only treatment
materials contained in a list of the Federal Ministry of Health may be used for the
disinfection of drinking water. This list is maintained by the Federal Environment Office.
Technical Rule – Worksheet DVGW W 557 (A) October 2012 of the German
Association of the Gas and Water Industry e.V. (DVGW).
For Germany, further instructions for the "Cleaning and Disinfection of Drinking Water
Installations" can be taken from the Technical Rule - Worksheet DVGW W 557 (A)
October 2012 of the German Association of the Gas and Water Trade (DVGW).
Section 6 "Cleaning" specifies under 6.1 "General, aim of the cleaning": "Cleaning
must be implemented as the first measure in case of an existing microbial contam-
ination of the nature of the drinking water. It may be necessary to disinfect the
installation additionally after cleaning."
Section 6.3 "Cleaning methods" describes the flushing methods "flushing with water"
and "flushing with an a water/air mixture" which are basically familiar from EN 806-4.
Contaminations can enter the pipe system during new installation and repair work;
there may even be a danger of microbial contamination. Section 6.3.2.2 "Flushing
with a water/air mixture" explains: "To remove encrustations, deposits or bio-films
in existing pipes, flushing with water and air is necessary to achieve an enhanced
cleaning performance. The full coverage turbulent flow causes locally high forces
to mobilise deposits. The water requirement is reduced considerably in comparison
with flushing with water."
Section 7 "Disinfection" describes the thermal and especially the chemical installa-
tion disinfection as a discontinuous measure for the decontamination of a drinking
water installation in detail. "Installation disinfection must only be carried out by
specialist companies." Section 7.4.2 lists 3 "proven disinfection chemicals", hydrogen
peroxide H
2
O
2
, sodium hypochlorite NaOCl and chlorine dioxide ClO
2
, their respec-
tive application concentration and exposure time. For example, the application
concentration for hydrogen peroxide is 150 mg H
2
O
2
/l and the exposure time 24
hours. Appendix A contains further information about these disinfection chemicals,
e.g. about application and work safety. Appendix B contains statements on the
material resistance to the recommended disinfection chemicals.
Information leaflet "Flushing, disinfection and commissioning of drinking
water installations" (August 2014) of the German Central Association for
Sanitary, Heating and Air Conditioning (ZVSHK)
For Germany the information leaflet "Flushing, disinfection and commissioning of
drinking water installations" (new edition August 2014) of the German Central
Association for Sanitary, Heating and Air Conditioning (ZVSHK) contains the originally
defined comprehensive methods for flushing and disinfection of drinking water
installations which are largely confirmed by EN 806-4:2010 and the Technical Rules
- Worksheet DVGW W 557 (A) October 2012 of the DVGW German Association of
the Gas and Water Industry e. V. It deals in particular additionally with chemical
disinfectants and describes thermal disinfection.
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