Download a copy of our brochure as a PDF.

Visit our downloads page for more brochures.

Realising the full potential of a high strength corrosion resisting material such as Tungum Alloy, requires careful consideration from first principles.

All too often, time is at a premium and temptation exists to cost competing materials on the basis of identical sections (ignoring opportunities afforded by the higher strength of the superior material). Whilst the temptation is a real one, the resultant system will often be more costly than is necessary or, indeed on occasions, the costing may indicate that the budget will simply not allow a maintenance free material to be fitted.

The former is undesirable, the latter is often regretted for life Even when time is at a premium, the best system will always result from following the procedures outlined below:

Establish the operating parameters:

• Working pressure
• Flow rate required
• Operating environment
• Reliability required
• Maintenance difficulty rating
• Other special consideration (such as the consequences of failure in a vital system)

Select the required tube section.

Taking into account that high strength materials ( such as Tungum Alloy ) afford an opportunity of using thinner walled tubes. Frequently, even smaller tubes have the same capacity as larger ones in lesser material. The benefi ts to be gained are often substantial in contributing to:

• The cost effective use of tubing
• Ease of manipulation / fabrication
• Simplified handling during construction
• Reduced cost as a result of using smaller tube fittings and clamps
• Smaller, more compact systems, through the use of smaller sections

Remember the corrosion resistance, cold working and clean bore characteristics of Tungum Alloy combine to give the advantage of:

• Eliminating the need to protect the tubing from the elements prior to and during fabrication.
• Reducing the time and, most importantly, the cost involved in purging a system of contamination
• Minimising the risk of damage to expensive circuit control equipment
• Virtually eliminating maintenance costs

Theoretical Burst Pressure

The values for minimum theoretical burst pressure have been calculated in accordance with the formula quoted in BS.1306; using a minimum ultimate strength of 430 N/mm2 (27.84 Tons/sq. in). The figures shown are for tubes in the straight, "as supplied" condition.

When selecting a tube for a particular application, allowances must be made for the effects of any bending which take place during fabrication.

Maximum working pressure

Engineering installations demand that a safety factor be applied when establishing the sections of material to be used. The maximum working pressure will be the minimum theoretical burst pressure of the particular section divided by the desired factor of safety.

BS.1306 recommends a factor of safety of 4:1 for copper alloy tubes used in pressure vessels. If when installing Tungum tube it has to be heated to a temperature in excess of 700°c, its original properties may be restored by a precipitation hardening treatment carried out at 500°c for 1 hour and air cooled.

Conditions Of Tube As Supplied

Tungum Alloy tubes are solid drawn (seamless), and are supplied in the “W.P” (precipitation hardened) condition within the tensile range required to meet the appropriate specification. Hard, as drawn, tube may be supplied on request, within the tensile range of 550-664 N/mm2 (35-43 Tons/sq. in.) with an average V.P.N. hardness of 215.

Length of Tungum Tube

Tubes supplied to DTD specifications are in random lengths of 4.57 / 5.18 metres (15 / 17 feet ). Tube to specification TCL100 is supplied in random lengths of 3.95 metres ( 13 feet ) and over, average length 5.50 / 6.10 metres ( 18 / 20 feet). Subject to prior agreement, longer lengths of tubing can be supplied

Tolerances

Dimensional tolerances for Tungum tubing are stated in the appropriate specification – DTD.5019; DTD253A; AFS.4000; NES.749 Part 3 or BS EN 12449 - Formally BS 2871.

Tubes Supplied to specification TCL100 conform to the tolerances laid down in BS EN12449 CW 700R, Cond, R430.

The tables, feature the theoretical weight per unit length for a tube of nominal dimensions. Due to manufacturing tolerances, the actual weight of any given tube can vary from this datum. In such cases, the actual weight consigned and invoiced will differ slightly from that calculated theoretically.

Availability

As a policy, large stocks of Tungum tubing are maintained in both metric and imperial sizes. Whilst this enables most popular sizes to be available Ex. Stock, certain of the lesser used sections must be considered as being subject to a special order.

If the range does not include your particular size requirement, please call to discuss. Conversion table for standard wire gauges, decimals and metric.

Back to top