Level Wound Coil

All Silmet copper tubes in Level Wound Coils for industrial use and ACR are produced in compliance with international standards and with the specific requirements of customers. Particular attention is paid to dimensional uniformity, uniformity of the physical state, the absence of faults and internal cleanliness of the copper tubes.

Characteristics

The length, weight, number of faults present, dimensions and all references aimed at guaranteeing the traceability of the product with regard to laboratory tests carried out in compliance with stringent sampling and control plans implemented during production, are highlighted for each individual coil.
The internal cleanliness of the copper tubes is considerably above the limit of 0.038 g/m2.

The Silmet Quality System is certified in compliance with the ISO 9001:2015 standard; the Quality Service is assigned to highly qualified, constantly updated personnel whose functions are independent from production departments; they use the most sophisticated laboratory and production control equipment


Production

All phases of the production process, starting from acceptance of raw materials, are subject to very severe sampling and control plans aimed at guaranteeing that the end products achieve very high quality standards.

Silmet has always been aware of the needs of the market and is constantly up-to-date technologically.
With all these things in mind, in order to help its customers with the growing trend in production automation and to be able to satisfy their requirements, Silmet is equipped with cutting-edge LWC copper tube production plants.


Usage

Silmet S.p.A. has been manufacturing copper tubes for usage in plumbing, heating, sanitary and industrial applications since 1973. Over recent years, thanks to its excellent conductivity, machinability, resistance to corrosion and user-friendliness, the copper tube has made a name for itself as the ideal product for air-conditioning/refrigeration equipment, for the heating industry and for the production of heat exchangers.

Download technical sheets

Technical sheets

COPPER CHEMICAL/PHYSICAL/TECHNOLOGICAL PROPERTIES
Symbol Cu
Atomic number 29
Atomic weight 2,6625
Crystalline structure cubic with faces centred with the side of the cube 3.6078 Å
Smelting temperature 1083° C
Boiling temperature 2595° C
Volumic mass (density) at 20° C 8,94 g/cm3
Coefficient of linear thermal expansion at 20° C 0,0000165 · K-1
Solidification shrinkage 4,92%
Specific heat at 20° C 385 J/kg K
Latent smelting heat 205 kj/kg
Thermal conductivity at 20° C 391 W/m K
Electric resistivity at 20° C annealed physical state 0,017241 Ω mm2/m
Electric resistivity temperature coefficient at 20° C 0,00393 · K-1
Alloy for the production of LWC Cu-DHP o CW024A (Cu = 99,90% min. - P = 0,015 ÷ 0,040%)
MECHANICAL CHARACTERISTICS
material condition thickness tensile strength 0,2% proof strength elongation average grain size hardness
t Rm Rp0,2 A HV HB
mm N/mm2 N/mm2 % μm
max min min max min min max min max min max
EN 12449
R200 20 200 - 110 40 - - - - - -
H040 20 - - - - - - 40 65 35 60
EN 12451
R220 20 220 - - 40 15 50 - - - -
EN 12735-2
Y040 - 220 40 90 40 15 40 - - - -
Y035 ≥ 0,6 mm 210 35 80 40 30 60 - - - -
TOLERANCES ON OUTSIDE DIAMETER
nominal outside diameter
mm
tolerances on nominal diameter
over up to
adn included
tolerances on mean nominal outside diameter applicable to any diameter including deviation from circular form
EN 12449
3 6 ± 0,06 mm ± 0,30 mm
6 10 ± 0,06 mm ± 0,50 mm
10 20 ± 0,08 mm ± 0,70 mm
20 30 ± 0,12 mm ± 0,090 mm
EN 12451
6 14 - 0 -0,12
14 26 - 0 -0,20
EN 12735-2 tolerances on mean nominal outside diameter
wt ≤ 0,4 mm wt > 0,4 mm
6 13 ± 0,04 mm ± 0,04 mm
13 16 ± 0,05 mm ± 0,04 mm
16 28 - ± 0,05 mm
EN 12735-2 maximum deviation from circular form
nominal wall thickness for Ø from 6 Ø over 9,8 Ø over 13 Ø over 16 Ø over 22
over up to up to 9,8 up to 13 up to 16 up to 22 up to 67
- 0,41 4,00% 5,00% 7,00% by agreement between the purchaser and the supplier
0,41 0,7 3,50% 4,00% 6,00%
0,7 - 3,00% 3,50% 5,00%
TOLERANCES ON WALL THICKNESS
nominal outside diameter
mm
tolerance on nominal wall thickness t
over up to
and included
t from 0,3 mm up to and included 1 mm t over 1 mm up to and included 3 mm
EN 12449
3 28 ± 15% ± 13%
EN 12451 all wall ticknesses
all diameters ± 10%
EN 12735-2
tolerances nominal outside diameter nominal wall thickness e
d from 0,25 up to and included 0,3 over 0,3 up to and included 0,35 over 0,35 up to and included 0,4 over 0,4 up to and included 0,5 over 0,5 up to and included 0,63 over 0,63 up to and included 0,8 over 0,8 up to and included 1,5 over 1,5 up to and included 3
over up to and included
maximum permissible deviation at any pointa 6 133 ± 0,025 ± 0,03 ± 0,03 ± 0,04 ± 0,05 ± 0,06 ± 8&b ± 15%b
tolerances on mean wall thickness 6 9,52 ± 0,01 ± 0,01 ± 0,01 ± 0,015 ± 0,02 ± 0,02 - -
9,52 13 - ± 0,01 ± 0,01 ± 0,015 ± 0,02 ± 0,02 - -
13 16 - - ± 0,01 ± 0,015 ± 0,02 ± 0,02 - -
16 22 - - - - - ± 0,02 ± 0,05 -
22 40 - - - - - ± 0,02 ± 0,05 -

a including deviation from concentricity.

b value in percentage of nominal thickness.