Lawton Tubes
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Working Pressures / Mechanical Properties

Dimensions and Tolerances (includes chrome plated and PVC covered)

O.D.
(mm)
Wall (mm)TemperMax Working
Pressure bar up
Thickness
Tolerance
 Diameter Tolerance MeanDiameter Tolerance Including Ovality
60.6 (TX)Half Hard133±10%± 0.04mm±0.09mm
60.6Soft90±10%± 0.04mmNot applicable
60.8 (TY)Half Hard188±10%± 0.04mm±0.09mm
80.6 (TX)Half Hard97±10%± 0.04mm±0.09mm
80.6Soft66±10%± 0.04mmNot applicable
80.8 (TY)Half Hard136±10%± 0.04mm±0.09mm
100.6 (TX)Half Hard77±10%± 0.04mm±0.09mm
100.7 (TY)Soft62±10%± 0.04mmNot applicable
100.8 (TY)Half Hard106±10%± 0.04mm±0.09mm
120.6 (TX)Half Hard63±10%± 0.04mm±0.09mm
120.8 (TY)Half Hard87±10%± 0.04mm±0.09mm
150.7 (TX)Half Hard58±10%± 0.04mm±0.09mm
151.0 (TY)Half Hard87±13%± 0.04mm±0.09mm
151.0 (TY)Soft67±13%± 0.04mmNot applicable
220.9 (TX)Half Hard51±10%± 0.05mm±0.10mm
221.2 (TY)Half Hard69±15%± 0.05mm±0.10mm
221.2 (TY)Soft57±15%± 0.05mmNot applicable
280.9 (TX)Half Hard40±10%± 0.05mm±0.10mm
281.2 (TY)Half Hard55±15%± 0.05mm±0.10mm
351.0 (LiteX)Hard42±15%± 0.06mm±0.07mm
351.2 (TX)Half Hard42±10%± 0.06mm±0.11mm
351.5 (TY)Hard64±10%± 0.06mm±0.07mm
421.0 (LiteX)Hard35±15%± 0.06mm±0.07mm
421.2 (TX)Half Hard35±10%± 0.06mm±0.11mm
421.5 (TY)Hard53±10%± 0.06mm±0.07mm
541.2 (TX)Hard33±15%± 0.06mm±0.07mm
542.0 (TY)Hard55±10%± 0.06mm±0.07mm
66.71.2 (TX)Hard26±15%± 0.07mm±0.10mm
66.72.0 (TY)Hard45±15%± 0.07mm±0.10mm
76.11.5 (TX)Hard29±15%± 0.07mm±0.10mm
76.12.0 (TY)Hard39±15%± 0.07mm±0.10mm
1081.5 (TX)Hard20±15%± 0.07mm±0.20mm
1082.5 (TY)Hard34±15%± 0.07mm±0.20mm
1331.5 (TX)Hard16±15%± 0.20mm±0.70mm
1592.0 (TX)Hard18±15%± 0.20mm±0.70mm
2193.0 (TX)Hard20±15%± 0.60mm±1.50mm
Working pressures are to BS 2871:part1:1971

Water Capacity

Table W Microbore

O/D mmCapacity kg/m
60.0169
80.0347
100.0558

Table X 6mm – 159mm

O/D mmCapacity kg/m
60.0169
80.0347
100.0615
120.0890
150.1416
180.2063
220.3140
280.5308
350.8220
421.2163
542.0712
673.2134
764.1699
1088.6107
13313.2647
15918.8351

Table Y 6mm – 108mm

O/D mmCapacity kg/m
60.0139
80.0302
100.0529
120.0818
150.1280
180.1952
220.2943
280.5050
350.7888
421.1758
541.9317
673.2375
764.0438
1088.2527

Expansion of copper tube

Copper has a coefficient of linear expansion of 17 x 10-6oC. for example, a 10 metre length of copper tube carrying hot water at 600C will increase in length by almost 7mm when heated from 200C. Assuming that temperature cycling of the system is 200C, thaere will be a continuous cycle of expansion and contration of 3.4mm. Refer to table below.

Temperature change3m4m5m6m7m8m9m10m12m25m
10°0.5mm0.7mm0.9mm1.0mm1.2mm1.4mm1.5mm1.7mm2.0mm4.3mm
20°1.0mm1.4mm1.7mm2.0mm2.4mm2.7mm3.0mm3.4mm4.0mm8.5mm
30°1.5mm2.0mm2.6mm3.1mm3.6mm4.1mm4.6mm5.1mm6.1mm13.0mm
40°2.0mm2.7mm3.4mm4.1mm4.8mm5.4mm6.1mm6.8mm8.2mm17.0mm
50°2.6mm3.4mm4.3mm5.1mm6.0mm6.8mm7.7mm8.5mm10.2mm21.0mm
60°3.1mm4.1mm5.1mm6.1mm7.1mm8.2mm9.2mm10.2mm12.2mm26.0mm
70°3.6mm4.8mm6.0mm7.1mm8.3mm9.5mm10.7mm11.9mm14.3mm30.0mm
80°4.1mm5.4mm6.8mm8.2mm9.5mm10.9mm12.2mm13.6mm16.3mm34.0mm
90°4.6mm6.1mm7.7mm9.2mm10.7mm12.2mm13.8mm15.3mm18.4mm38.0mm
100°5.1mm6.8mm8.5mm10.2mm11.9mm13.6mm15.3mm17.0mm20.4mm43.0mm
150°7.65mm10.2mm12.75mm15.3mm17.85mm20.4mm22.95mm25.5mm30.6mm63.75mm
200°10.2mm13.6mm17.0mm20.4mm23.8mm27.2mm30.6mm34.0mm40.8mm85.0mm
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