CEA 4001 - Page 95

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Pipes shall be installed in accordance with the manufacturer’s instructions and shall be protected
against corrosion.
NOTE : the following types of pipe are recommended : cast iron, ductile iron, spun cement, reinforced
glass fibre.
Adequate precautions shall be taken to prevent damage to piping, for example by passing vehicles.
15.1.2 Above ground piping
Piping downstream of control valves shall be steel or copper or another material in accordance
with appropriate specifications valid in the place of use of the system. When steel pipes with a nominal
diameter equal to or less than 150 mm are threaded, cut-grooved or otherwise machined, they shall
have a minimum wall thickness in accordance with ISO 65M. When steel pipe ends are formed
without significant by reducing the wall thickness, e.g. by roll-grooving or pipe end preparation for
welding, they shall have a minimum wall thickness in accordance with ISO 4200 range D.
Copper pipes for LH and OH1 shall be in accordance with EN 1057.
NOTE 1: For dry, alternate or pre-action installations, galvanised steel should preferably be used.
NOTE 2: When mechanical pipe joints are used, Minimum wall thickness shall also be in accordance with
the joint manufactures’ recommendations.
15.1.3 Welding
Welders shall be approved in accordance with EN 287-1.
Welded pipe and fittings less than DN 65 mm in diameter shall be welded in the supplier factory.
The company producing welding shall have a quality management system accepted by the authorities such
as ISO 9001.
An accredited laboratory accepted by the authorities shall check the following welding procedures
and welding test pieces:
Socket weld procedure: Welding of sockets onto pipes smaller than DN 65 mm;
Pipe weld procedure: Welding of pipes smaller than DN 65mm including welding of pipes
smaller than DN 65mm onto larger dimensioned pipes.
The quality management system shall include the following main requirements:
• The welded joint shall be made according to EN 25817, quality class D “Arc-welded joints in steel –
guidance on quality levels for imperfections”;
• No debris shall be left inside the pipes after the welding operation;
• The welded joint shall fully penetrate the pipe wall if no evidence according to EN 288
“specifications and approval of welding procedures for metallic materials” is provided. The welded
joint shall not intrude into the pipe more than:
a) 1 mm average;
b) 1,5 mm maximum.
• Welded connections shall not cause pressure losses higher than 105 % of the loss produced in
standard fittings;