SS316L Encapsulated Cable UNS S31603 Tubing Encapsulated Conductor For Downhole
316L Stainless Steel Tubing Encapsulated Cable for Downhole Applications in Oil Wells
Tubing Encapsulated Cable (TEC)
TEC uses welded stainless steel and nickel alloy tubing to protect electrical and optical components from the pressure and corrosive effects of the downhole environment. Polymeric encapsulation provides additional mechanical protection.
A wide selection of copper and fiber components from Meilong Tube allow production of the industry’s most sophisticated instrumentation cables. Since first introducing TEC for the oil and gas industry in 2015, Meilong Tube has continually improved and optimized this product for new generations of downhole gauges and tools for increasingly hotter and deeper wells.
TEC configurations are available with an almost infinite combination of components in splice-free custom lengths.
Standard encapsulation sizes (11 mm x 11 mm square) are available to meet almost any downhole requirements.
Composite cables utilizing various combinations of electrical and optical components are available to match specific downhole needs.
Typical Constructions
18 AWG Single Conductor Incoloy 825 Tube Square Encapsulated
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A) 18 AWG (7 x 0.39 mm) tinned copper O.D. 0.046 in (1.16 mm) nominal
B) FEP insulation O.D. 0.098 in (2.49 mm) nominal
C) Red polypropylene filler O.D. 0.180 in (4.57 mm) nominal
D) Alloy 825 tube Wall thickness 0.035 in (0.89 mm) nominal O.D. 0.250 in (6.35 mm) nominal
E) Yellow square profile polypropylene 0.433 in (11 mm) square
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5 AWG Single Conductor Stainless 316L Tube Encapsulated
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A) 5 AWG (single conductor) copper O.D. 0.181 in (4.6 mm) nominal
B) PFA insulation O.D. 0.228 in (5.8 mm) nominal
C) PFA insulation O.D. 0.276 in (7.0 mm) nominal
D) Stainless steel 316 tube Wall thickness 0.035 in (0.89 mm) nominal O.D. 0.375 in (9.53 mm) nominal
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Tubing Options
TEC is selected based on well conditions such as pressure, temperature and corrosiveness of the well fluid. The tubing is composed of an alloy matched to the application. It is then longitudinally welded, eddy current tested and drawn to finished size. Complete test data is available for every tube.
- Stainless steel 316L
- Duplex 2205
- Super Duplex 2507
- Incoloy 825
Mechanical Characteristics for Alloy TEC, Cold Worked
| Diameter | Wall Thickness |
Stainless 316L Minimum Collapse |
Incoloy 825 Minimum Collapse |
Minimum Bend Radius* |
| inches | inches | psi | psi | inches |
| 0.125 (1/8) | 0.022 | 23,882 | 25,209 | 0.75 |
| 0.250 (1/4) | 0.028 | 16,371 | 17,281 | 1.50 |
| 0.250 (1/4) | 0.035 | 19,688 | 20,781 | 1.50 |
| 0.250 (1/4) | 0.049 | 26,173 | 27,627 | 1.50 |
| 0.375 (3/8) | 0.035 | 13,783 | 14,549 | 2.25 |
| 0.375 (3/8) | 0.049 | 18,739 | 19,780 | 2.25 |
Calculations based on minimum yield strength of 120,000 psi.
All TEC tubing is oversized welded and drawn.
Tubing can be custom printed with a variety of data including part number, serial number, sequential length and purchase order number.
*The bending radius indicated is in a static condition after final training at the termination. All bending must be performed using a tubing bender to ensure that the bending radius is uniform. While deploying into or out of the well, the minimum bending radius should be as large as possible.
Electrical Components
| TEC Style | TEC 100 | TEC 150 | TEC 175 | TEC 200 | TEC 250 |
| Temperature Range | -10 to 100°C | -10 to 150°C | -100 to 175°C | -100 to 200°C | -100 to 250°C |
| Filler | PP | PP | FEP | FEP | PFA |
| Insulation | PP | FEP | FEP | FEP | PFA |
Maximum Electrical Conductor Resistance @ 20°C (68 °F)
| Conductor |
Conductor O.D. |
Conductor O.D. |
Solid Bare Copper | 7 Strands Bare Copper | ||
| AWG | inches | mm | Ohms / kft | Ohms / m | Ohms / kft | Ohms / m |
| 18 | 0.0403 | 1.02 | 6.52 | 21.4 | 6.66 | 21.8 |
| 17 | 0.0453 | 1.15 | 5.15 | 16.9 | 5.27 | 17.3 |
| 16 | 0.0508 | 1.29 | 4.10 | 13.5 | 4.18 | 13.7 |
| 15 | 0.0571 | 1.45 | 3.24 | 10.6 | 3.31 | 10.9 |
| 14 | 0.0641 | 1.63 | 2.57 | 8.45 | 2.62 | 8.62 |
| 13 | 0.0720 | 1.83 | 2.04 | 6.69 | 2.08 | 6.82 |
| 12 | 0.0808 | 2.05 | 1.62 | 5.31 | 1.65 | 5.43 |
| 11 | 0.0907 | 2.30 | 1.29 | 4.22 | 1.32 | 4.30 |
| 10 | 0.102 | 2.59 | 1.019 | 3.34 | 1.039 | 3.41 |
| 9 | 0.114 | 2.90 | 0.808 | 2.65 | 0.825 | 2.71 |
| 8 | 0.128 | 3.25 | 0.641 | 2.10 | 0.654 | 2.14 |
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