BS EN 489-2009 pdf download.District heating pipes Preinsulated bonded pipe systems for directly buried hot water networks Joint assembly for steel service pipes, polyurethane thermal insulation and outer casing of polyethylene.
The requirements of this BS EN 489 aim to obtain a technical life of the joints of at least 30 years.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references. only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 253:2009. District heating pipes — Pr&nsulated bonded pipe systems for directly buried hot water networks — Pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene
EN 287-1, Qualification test of welders — Fusion welding — Part 1: Steels
EN 444, Non-destructive testing — General principles for radiographic examination of metallic materials by X- and gamma-rays
EN 1435. Non-destructive examination of welds — Radiographic examination of welded joints
EN 12517-1:2006, Non-destructive testing of welds — Part 1: Evaluation of welded joints in steel, nickel, titanium and their alloys by radiography — Acceptance levels
EN 13941, Design and installation of preinsulated banded pipe systems for district heating
EN 14419. District heating pipes — Preinsulated bonded pipe systems for directly buried hot water networks — Surveillance systems
EN ISO 845, Cellular plastics and rubbers — Determination of apparent (bulk) density (ISO 845:1988)
EN ISO 4590:2003, Rigid cellular plastics — Determination of the volume percentage of open cells and of closed cells (ISO 4590:2002)
EN ISO 5817:2007, Welding — Fusion-welded joints In steel, nickel, titanium and their alloys (beam welding excluded) — Quality levels for imperfections (ISO 5817:2003, corrected versiouc 2005, including Technical Corrigendum 1:2006)
EN ISO 6520-1, Welding and allied processes — Classification of geometric imperfections in metallic materials — Part 1: Fusion welding (ISO 6520-1:2007)
EN ISO 9692 (all parts), Welding and allied processes — Recommendations for joint preparation (ISO 9692)
EN ISO 15607:2003. Specification and qualification of welding procedures for metallic materials — General rules (ISO 15607:2003)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 253:2009 and the following apply.
joint
complete construction of the connection between adjacent pipes and/or fittings
3.2
joint casing
part that connects the two pipe casing ends in a joint
3.3
joint insulation
thermal insulation that fills the volume confined by the steel sendce pipe, the joint casing and the ends of the two connecting pipes
3.4
on site poured joint Insulation
joint insulation manufactured by pouring the liquid polyurethane foam components1) into the joint volume at the work site
3.5
prefabricated joint insulation
joint insulation manufactured by installing prefabricated elements of polyurethane foam in the joint volume prior to installation of the joint casing2)
3.6
steel weld
connection between the steel service pipes by welding
3.7
polyethylene weld
fusion jointing of polyethylene to polyethylene under Influence of heat, pressure and time
3.8
double sealing
two-sealing systems independently installed on the same joint, not influencing each other negatively and thus independently functioning during the service life of the joint
3.9
surveillance system
system that consists of measuring sections and measuring instruments for surveillance of pipe systems
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 reproduce 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 5.4.4 of
EN 253:2009
4.1.5 Steel service pipe weld
The steel service pipe weld shall:
— be tight when tested in accordance with A.6;
— have mechanical properties equivalent to those of the service pipe.
4.1.6 Polyurethane rigid foam insulation (PUR)
The foaming of a joint on site shall be carried out in a confined space.
The insulation shall completely fill the joint.
The requirements for the rigid PUR foam insulation shall be in accordance with 4.2.3.2, 4.2.3.3, 4.2.3.4 and with
EN 253:2009, 4.4.3 for the compressive strength.
4.1.7 JoInt casing
The joint casing shall be tight against external water pressure.
Casings for welded joints shall fulfil Clause 4.3.1 of EN 253:2009.
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 manufacturers documentation.BS EN 489-2009 pdf download.