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The copper tubes are produced in Serbia of high phosphorus copper, designation Cu-DHD (according to EN 1057), with guaranteed copper content of 99.90% min. and phosphorus content 0.015 - 0.040%. We have copper tubes made of some other copper alloys.

Weight and working pressure
Weight and maximum allowable working pressure of fluids are computed using the following equations for each copper tube size:

For weight	For pressure
Q = (D - S) x S x ð x ã, gr/m	P = 200 Rm S / DN, bara
where:	where:
D - outer diameter, mm	200 - conversion constant
S - wall thickness, mm	Rm - tensile strength, N/mm²
ã - specific weight of copper, 8.94 kg/dm³	S - wall thickness, mm
ð - 3,14	D - outer diameter, mm
	N - safety factor (5)

Copper tubes - dimensions, allowable pressures and weights

DxS (mm)	6x1	8x1	10x1	12x1	15x1	16x1	18x1	22x1	28x1,5	35x1,5	42x1,5	54x2	76x2,5
Pressure (bar)*	145	109	87	71	57	52	48	38	46	36	30	31	25
Weight (kg/m)	0,140	0,197	0,253	0,309	0,393	0,421	0,477	0,590	1,116	1,411	1,705	2,919	5,158

* Values indicated for pressure in the table above are computed for soft tubes with safety factor N=5. Values indicated for allowable pressure relate only to tubes, not to their joints.

Duplex Steel
ASTM / ASME SA 790 UNS NO S 31803, S 32205, S 32550, S 32750, S 32760.

Copper Alloy
ASTM / ASME SB 111 UNS NO. C 10100, 10200, 10300, 10800, 12000, 12200, 70600, 71500.
ASTM / ASME SB 466 UNS NO. C 70600 ( CU -NI- 90/10), C 71500 ( CU -NI- 70/30)

Duplex Steel
ASTM / ASME SA 790 UNS NO S 31803, S 32205, S 32550, S 32750, S 32760.

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