Scope: This document specifies requirements for design, calculation and installation of factory made thermal insulated bonded single and twin pipe systems for buried hot water networks for continuous operation with treated water at various temperatures up to 120 °C and occasionally peak temperatures up to 140 °C for maximum 300 h/a, and maximum internal pressure 2,5 MPa.

Flexible pipe systems according to the EN 15632 series are not under the scope of this standard.

The standard EN 13941, Design and installation of thermal insulated bonded single and twin pipe systems for directly buried hot water networks consists of two parts:
a) EN 13941-1: Design;
b) EN 13941-2: Installation.
The requirements in this part, EN 13941-1, form a unity with those of EN 13941-2.

The principles of the standard may be applied to thermal insulated pipe systems with pressures higher than 2,5 MPa, provided that special attention is paid to the effects of pressure.

Adjacent pipes, not buried, but belonging to the network (e.g. pipes in ducts, valve chambers, road crossings above ground etc.) may be designed and installed according to this standard.

This document presupposes the use of treated water, which by softening, demineralization, de-aeration, adding of chemicals, or otherwise has been treated to effectively prevent internal corrosion and deposits in the pipes.

NOTE For further information on water qualities to be used in district heating pipe systems see also bibliographic entry [2].

This standard is not applicable for such units as:
a) pumps;
b) heat exchangers;
c) boilers, tanks;
d) systems behind domestic substations.

Cross References:
EN 17248
EN 489-1
EN 10204
EN 10217-5
EN 10217-2
EN 253
EN 13480-3
EN 10253-2
EN 448
EN 488
EN 10216-2
EN 14419
EN ISO 1856
EN 15698 (all parts)
EN 13941-2
CEN/TR 1295-2
EN 13445-3
ENV 1991-3:2003
DVS 2205-1
EN ISO 22475-1
CEN ISO/TS 17892-10:2004
EN ISO 12957-1:2005
EN 1991-2
CEN/TR 16911
ENV 1993 (all parts)
EN 10217-1:2002
EN 1997-1:2004/A1:2013
EN 1997-2:2007
EN ISO 22476-1:2012
EN 1594:2013


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