DIN EN 489 pdf free download

DIN EN 489 pdf free download. Preinsulated bonded pipe systems for directly buried hot water networks.
4.1.3 Competence of the welder and fitter
Persons installing joints on preinsulated pipe networks shall possess a valid evidence of qualification stating that they have received training relevant to the system and the type of joint.
Steel service pipe welders shall possess a valid certificate in accordance with EN 287-1.
Polyethylene welders shall possess a valid evidence of qualification which documents their ability to perform reproductive welding of the quality specified.
Recommended subjects for training are given in annex C.
4.1.4 Expected thermal life and long term temperature resistance
The requirements for expected life and long term temperature resistance shall be in accordance with 4.5.4 of
EN 253:2003.
4.1.5 Steel service pipe weld
The steel service pipe weld shall:
— be tight when tested in accordance with A.5;
— have mechanical properties equivalent to those of the service pipe.
4.1.6 Polyurethane rigid foam insulation (PUR) The foaming of a joint shall be carried out in a confined space. The PUR foam shall completely fill the joint.
The requirements for the rigid PUR foam insulation shall be in accordance with 4.4.2, 4.4.3, 4.4.4 and 4.4.t 0?
EN 253:2003.
4.1.7 Joint casing
The joint casing shall be tight against external water pressure.
All joints shall be subject to a leak-test. If this is not possible, a type specific procedure of 100 % visual test in combination with a destructive spot test scheme shall be described in the manufacturer’s documentation.
NOTE Leakage testing of joints should be carried out with air or another suitable gas. The leak-tightness should be checked by means of a suitable indicator liquid or a leakage detector. The indicator liquid should be detrimental neither to the casing and joint material nor to the environment.
Proper handling and installation procedures and type specific test procedures for the verification of leak-tightness of installed joint casings shall be described in the manufacturer’s documentation.
4.2 Type test requirements
4.2.1 Soil stress test
No water inqress shall be detected after the soil stress test in accordance with 5.1.
4.2.2 Polyurethane rigid foam Insulation (PUR) properties
The polyurethane rigid foam insulation (PUR) for joint assemblies shall meet the requirements of 4.4, 4.5.4 and
4.5.5 of EN 253:2003.
4.3 Installation instructions
4.3.1 General
Installation instructions, crucial for the quality of the installed joint and for achieving the expected life, shall be a part of the manufacturer’s documentation and shall be supplied together with the component parts.
The installation instructions shall, as a minimum, deal with the topics mentioned in 4.3.2 to 4.3.7.
4.3.2 Work environment
Proper procedures to obtain optimum work conditions on site shall be specified.
4.3.3 Cleaning
Proper procedures for the cleaning and drying shall be specified for:
— steel pipe surfaces;
— insulation surfaces;
— joint casing surfaces;
— casing surfaces.
The sentence “Any wet foam shall be removed from the pipe ends’ shall be included in the instructions.
4.3.4 SurveIllance system
When a surveillance system is installed proper procedures for connecting the surveillance system shall be specified. This specification shall, as a minimum, include:
— general handling instructions to avoid damaging the system;
— procedures for positioning and connecting adjacent pipes to ensure the function of the system;
— procedures and test methods to check the function of the surveillance system during construction.
4.3.5 Steel site weld
Proper procedures for the steel weld shall be described. This description shall, as a minimum, include the parts
‘Welding process’ and ‘Preparation for welding and lining up’ in accordance with annex A.
4.3.6 Joint casing
Proper handling and installation procedures for the joint casing shall be specified.
Type specific test procedures for leak-tightness of installed joints shall be described.DIN EN 489 pdf download.