Tubular Products

Tubular Products

Stainless Steel Seamless Tube

Applications

Tube is used for the conveyance of air, liquid and gas in instrumentation, hydraulic
and general service applications.

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SEAMLESS TUBE
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Key Features 

  • Ease of installation – Tube provides many advantages over traditional piping systems, it is easy to bend with a tube bender which reduces the number of connections and potential leak points, it is less heavy and bulky than pip d orbital welded or used in conjunction with tube fittings
  • Surface finish – Seamless tube is required to be ‘free of scale’ and can be supplied pickled or bright annealed
  • Certification – certified and manufactured in accordance with ASTM A269 & ASTM A213
  • Traceability – In accordance with the above specifications each length of tube is fully traceable.
  • Special requirements – plugged ends, oxygen cleaning and individual wrapped tubes are available upon request.

Tube Selection 

Proper selection and handling of the tube is critical in ensuring reliability in tubing systems and when used with tube fittings the tube should be inspected for surface finish defects and scratches. It is recommended that a tube cutter be used to cut the tube and thereafter the ends be deburred.

The selection of tube should also be based on the operating pressure, flow, temperature and the compatibility of the process fluid in any application.

Material certification and specifications should also be inspected to identify the material and dimensions i.e. the OD size and the wall thickness, the hardness of the tube and the ASTM test results.

All tube comes standard with the following markings, the size of the OD& Wall Thickness, material grade, specification & heat code for traceability.

  • Hardness - For use with tube fittings the tube should not exceed RB90 and be made of a softer material than the tube fittings.
  • Wall Thickness – The wall thickness determines the recommended pressure the tube can withstand as listed in ASME B31.3. The tables identify the allowable working pressures. (see tables below)

Suggested Allowable Pressure Tables 

Figure and tables are for reference only. No implication is made that these values can be used for design work. Applicable codes and practices in industry should be considered. ASME Codes are the successor to and replacement of ASA Piping Codes.

  • All pressures are calculated from equations in ASME B31.3, Process Piping. See factors for calculating working pressures in accordance with ASME B31.1, Power Piping.
  • Calculations are based on maximum OD and minimum wall thickness, except as noted in individual tables.
  • No allowance is made for corrosion or erosion
Table 1: Fractional Stainless Steel Seamless Tubing

Fractional Stainless Steel

Allowable working pressures are calculated from an S value of 20 000 psi (137.8 MPa) for ASTM A269 tubing at –20 to 100°F (–28 to 37°C), as listed in ASME B31.3 and ASME B31.1, except as noted.

For Welded Tubing
For welded and drawn tubing, a derating factor must be applied for weld integrity:

  • for double-welded tubing, multiply working pressure by 0.85
  • for single-welded tubing, multiply working pressure by 0.80

Suggested Ordering Information
High-quality, fully annealed (Type 304, 304/304L, 316, 316/316L, 317, 317/317L) (seamless or welded and drawn) stainless steel hydraulic tubing, ASTM A269 or A213, or equivalent. Hardness not to exceed 90 HRB or 200 HV. Tubing to be free of scratches, suitable for bending and flaring. OD tolerances not to exceed ± 0.003 in. for 1/16 in. OD tubing.

Note: Dual-certified grades such as 304/304L, 316/316L, and 317/317L meet the minimum chemistry and the mechanical properties of both alloy grades.


Table 2: Metric Stainless Steel Seamless Tubing

Metric Stainless Steel Seamless Tubing
4-1 safety factor considering tensile strength of 75,000 psi at room temperature

Allowable working pressures are based on equations from ASME B31.3 and ASME B31.1 for EN ISO 1127 tubing
(D4, T4 tolerance for 3 to 12 mm; D4, T3 tolerance 14 to 50 mm), using a stress value of 137.8 MPa (20 000 psi) and
tensile strength of 516.4 MPa (74 900 psi), except as noted.

For Welded Tubing
For welded and drawn tubing, a derating factor must be applied for weld integrity:

  • for double-welded tubing, multiply working pressure by 0.85
  • for single-welded tubing, multiply working pressure by 0.80

Suggested Ordering Information
High-quality, fully annealed (Type 304, 304/304L, 316, 316/316L, 317, 317/317L) stainless steel tubing, EN ISO 1127 or equivalent. Hardness not to exceed 90 HRB or 200 HV. Tubing to be free of scratches, suitable for bending or flaring. OD tolerances not to exceed ± 0.076 mm for 3 mm OD tubing.

Note: Dual-certified grades such as 304/304L, 316/316L, and 317/317L meet the minimum chemistry and the mechanical properties of both alloy grades.

Pressure Ratings at Elevated Temperatures

Table 3: Elevated Temperature Factors

Elevated Temperature Factors
1. Based on 375°F (190°C) max.
2. Dual-certified grades such as 304/304L, 316/316L and 317/317L meet the minimum chemistry and the mechanical properties of both alloy grades
3. Based on the lower derating factor for stainless steel, in accordance with ASME B31.3.

To determine allowable working pressure at elevated temperatures, multiply allowable working pressures from Tables 1 and 2 by a factor shown in Table 3.

Example:
Type 316 stainless steel 1/2 in. OD 3 0.035 in. wall at 1000°F
1. The allowable working pressure at –20 to 100°F (–28 to 37°C) is 2600 psig (Table 1)
2. The elevated temperature factor for 1000°F (537°C) is 0.76 (Table 3): 2600 psig 3 0.76 = 1976 psig
The allowable working pressure for 316 SS 1/2 in. OD 3 0.035 in. wall tubing at 1000°F (537°C) is 1976 psig


Dekabon / Synflex 1300 Tubing

Composite Tubing

Synflex® composite tubing is comprised of a polyethylene/ aluminum construction that combines the advantages of both metal and plastic tubing.


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Synflex® composite tubing is corrosion, steam and water resistant and is ideal for high moisture areas and direct
burial applications. The outer jacket is impervious to most chemical containing environments and the inner layer provides excellent permeation properties and adds mechanical strength to the product.

Features

Tube Material: Polyethylene / Aluminium composite : Black high density polyethylene bonded to an overlapped aluminium tape having an ethylene copolymer coating.

Benefits

Fully bonded polyethylene / aluminium construction combines the advantages of both metal and plastic tubing. The tubing is manufactured in long continuous lengths that can eliminate many tting connections, yet it is light enough for an installer to carry to practically any location. It has shape holding ability 'stay put' characteristics which can provide neat looking bends without special bending tools, yet the metal reinforced tube wall gives greater pressure ratings than plain plastic tubing. The tube can be cut cleanly with a standard utility knife.

Application

Designed for pneumatic instrument control systems

Construction

High Density Polyethylene Cover. Polyethylene / Aluminium Core Tube (see table).

Temperature Range

Maximum operating +80°C

Easy To Install

The inner aluminium layer adds tube wall strength that permits the tube to span large distances without additional
support. It also makes a perfect tubing choice for direct burial without additional protection from concrete to earth
installations. Welding projections do not damage the tubing or its performance level.

Connection

Tubes are sized to connect with standard compression without special tube preparation. Full plastic tubing implies
the use of connections including plastic supports and ends. Sheathed metal tubes must usually be stripped before being connected however this tube eliminates this operation.

Availability

Standard Colour – Black (Other colours red, blue & gray, available on request).

Available in 25m, 75m and 300m (Min order Qty may apply for certain items)

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