Non Destructive test
Each tube is subjected to an Eddy current test for detection of local
defects. We are the only manufacturer of this category (Medical) of tubes
Mexflow Copper Tubes Compatible for CFC-Free Refrigerant for VRV, VRF,
RACs, Visicooter, Refrigerator and Other ACR Applications
The use of copper in air-conditioning and refrigeration systems has grown
steadily in recent years. MEXFLOW tubes increases the efficiency of the
system and substantially reduces the emission of harmful gases and SPMs.
MEXFLOW copper tubes are designed for longer service life.
Mexflow Copper Pipes Are Also Available With Mexflow Copper Fittings For
The Complete ACR Applications.
Other Applications of MEXFLOW Copper Pipes: Medigas Pipeline Plumbing
LPG/CNG Gas Pipeline I City Gas Distribution.
Copper Tubes : 3/16 Dia to 6 Dia ©Copper Fin Tubes «Copper
Fittings : 1/4 Dia to 5 Dia **Only manufacturer in India having In-House
Carbon Content Test facility as per EN 723
ASTM B68 / ASTM B75 / ASTM B280 / ASTM B88 / JIS H 3300 / EN1057 or BS2871
/ IS2501 / Internal Client Specifications.
A) Copper Tubes:
i) BS 2871 Part I : Copper Tubes for water, gas & sanitation
ii) BS EN 1057 : Seamless, round copper tubes for water and gas in sanitary
and heating applications
iii) ASTM B 88 : Seamless Copper Water tube
MAXIMUM WORKING PRESSURES
The maximum working pressures al temperature upto 650° C are
calculated using the following formula:
P= 20Ft/D-T Where P= maximum working pressure (bar) F=design stress (n/mm2)
T=minimum wall thickness (mm) D=maximum outside diameter (mm)
Tubes installed underground, laid under floors or in other inaccessible
places must be able to withstand twice the maximum working pressure. The
values of F used in above formula depend upon the condition of the tube and
are given below :
|Anneoled O, R220
Assuming good design practice and installation the maximum
recommended flow velocities of oxygenated water at different temperatures
are as follows : Maximum recommended flow velocities.
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Copper Tubes are manufactured as per EN 1057
meeting the following requirements
1) CHEMICAL COMPOSITION:
Copper Tubes ore designated under alloy C 106 also called DHP (Deoxidised
High Residual Phosphorized Grade).
The requirement is as follows :
Min. Copper including Silver % - 99.9%
2) DIMENSIONAL TOLERANCES:
Dimensional tolerance to confirm to the EN 1057. It must be noted that the
dimensional tolerance on copper tubes as specified for the outside diameter
is very important so that the annual gap between the tube & the fitting
is within a designated dimensional tolerance to ensure correct & proper
capillary action during the process of soldering or brazing. Please refer to
Table 1,2 & 3 for dimensional tolerance on outside diameter, dimensional
tolerance for wall thickness is given below:
Tolerances on wall thickness
3) MECHANICAL (PHYSICAL) PROPERTIES ARE DESIGNED IN EN 1057 TO BE AS
||Tolerance on wall thickness e"
||e < 1 mm(%)
||e > 1 mm(%)
4) FREEDOM FROM DEFECTS: Surface Quality
||Outside Diameter in mm
||Tensile Strength Mpa
||Hardness (only indicative) Hv
|Designated in Accordance with EN 1173
||Common Term used
||(40 to 70)
||(75 to 100)
The outer diameter & inner surface of the tube shall be clean &
smooth. An attack on copper tube can occur causing pitting corrosion when a
thin film of carbon is formed within the bore of the tube during the
manufacturing process. Concern over deleterious film in the bore has
prompted the newly adopted EN 1057 to call for a carbon film & carbon
content test, concerning the measurement of the residual & potential
carbon in a copper tube bore. MEXFLOW Copper Tubes meet this criteria.
5) FREEDOM FROM DEFECTS TESTS :
Each lube shall be subjected to one of the following test: Eddy current
test for detection of local defects, in accordance with pr EN1971. Or
Hydrostatic test or Pneumatic test. The choice of the method selected from
the above, is at the discretion of the manufacturer.
Hall hard copper tubes and soft annealed copper tubes must undergo a
bending test without formation of wrinkles on the inner bend. Bending is an
expansion of the outside surface of the bent tube & a contraction of the
inner surface of the tube. The formation of wrinkles on the inner surface
shows either the fact that the physical properties of the tube are not in
order or the bending mechanism i.e. the bending tool has got a gap more than
the diameter of the tube, which allows the tube to get raised while
conducting the bending operation from the former, allowing wrinkle formation
to take place on the inner surface.
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