Designing With Tungum Tubing

Tungum Tubing is compatible with all industry standard fittings


Almost any industry recognised instrumentation tube fitting can be used in conjunction with Tungum Tubing. Our tubing has special features but using it in the field is straightforward.

Impressive benefits list

Realising the full potential of a high strength corrosion resisting material such as Tungum is based on acknowledging:

  • the higher strength
  • greater corrosion resistance
  • longer life
  • and maintenance free benefit of the material.

Tungum Tubing is highly resistant to sea water and its atmosphere, resists both stress and crevice corrosion to offer outstanding serviceability, even at intermittent duty in the highly corrosive ‘splash’ zone.  

Condition Of Tube As Supplied

Tungum Tubing 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

Tube to specification BS EN12449 CW700R is supplied in random lengths of 5.791 metres ( 19 feet ). Tubes supplied to DTD specifications are in random lengths of 4.57 / 5.18 metres (15 / 17 feet ). Subject to prior agreement, different lengths of tubing can be supplied.



Tolerances

Dimensional tolerances for Tungum tubing are stated in the appropriate specification – BS EN 12449; ASTM B706; DTD.5019; DTD253A; AFS.4000; NES.749 Part 3. These 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.

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)


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

Download:
Tungum Design & Workshop Guide

Selecting tubing


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 beneļ¬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

      Link to Technical Page

Theoretical Burst Pressure

The values for minimum theoretical burst pressure can 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).

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

Download:
Tungum Tubing
Pressure Test Brochure

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.