Meilong Tube

High Working Pressure Polypropylene Encapsulated Hydraulic Control Line Flatpack

stars, based on 0reviews
10items available

High Working Pressure Polypropylene Encapsulated Hydraulic Control Line Flatpack

Meilong Tube manufactures high quality seamless and redrawn, seam-welded and redrawn coiled tubing which are made from corrosion-resistant austenitic, duplex, super duplex stainless steel and nickel alloy grades. 100% of products are used as hydraulic power control lines, chemical injection lines, alloy tubing in umbilicals and instrumentation tubing for the exploitation engineering in the upstream oil and gas industry.

Coiled tubing is available in sizes arrange from outer diameter 0.125 inch (3.175 millimeters) to 1 inch (25.4 millimeters). Wall thickness is up to 0.083 inch (2.108 millimeters). Lengths up to 65600 feet (20,000 meters) are available for cost-effective umbilical manufacturing. More sizes within the scope can be customized to be produced and delivered for meeting your special requirements.

Stainless steel 316L chemical injection line properties

Welded & floating internal plug redrawn tubing. Supplied in the annealed condition

Continuous length without orbital joint welds

AlloyUNSO.D.W.T.Working PressureBurst PressureCollapse PressureTest Pressure
Stainless 316LS316031/80.1250.0289,93140,9229,52511,600
Stainless 316LS316031/80.1250.03512,64052,04211,05615,225
Stainless 316LS316031/40.2500.0355,93924,4746,6217,250
Stainless 316LS316031/40.2500.0498,57235,3228,63210,150
Stainless 316LS316031/40.2500.06511,69448,16610,56213,775
Stainless 316LS316033/80.3750.0353,81815,7314,6594,350
Stainless 316LS316033/80.3750.0495,48322,5756,2226,525
Stainless 316LS316033/80.3750.0657,51730,9517,8658,700
Stainless 316LS316033/80.3750.0839,80840,3729,55111,600
Stainless 316LS316031/20.5000.0494,00316,4804,8355,075
Stainless 316LS316031/20.5000.0655,46122,5126,2066,525
Stainless 316LS316031/20.5000.0837,13329,3647,6488,700
Stainless 316LS316035/80.6250.0493,14412,9553,9573,625
Stainless 316LS316035/80.6250.0654,28517,6305,1055,075
Stainless 316LS316035/80.6250.0835,47222,5136,5196,525
Stainless 316LS316033/40.7500.0492,61910,7913,2962,900
Stainless 316LS316033/40.7500.0653,57014,6864,2834,350
Stainless 316LS316033/40.7500.0834,55818,7535,431


  • Theoretical burst pressure based on minimum wall thickness, and minimum tensile strength
  • Theoretical collapse pressure based on minimum wall thickness, and minimum yield strength
  • Pressure rating at 100°F (38°C), neutral and static conditions

As more oil and gas extractions move into deeper and harsher waters where extreme offshore environments demand extreme safety, our work is to help you use the “right” corrosion resistant material for coiled umbilical tubing to improve the safety and reliability of your work. This is the power for driving our innovations and continuous development.

Encapsulation Description

Encapsulation is a plastic that is extruded over metal tube. Encapsulation prevents damage to the metal tubes during the manufacturing process. The encapsulation also provides additional abrasion resistance and is required if cable protectors are installed to enhance the holding force over each production tubing connection.

Encapsulations are available in a wide range of configurations with options of single pass encapsulation and dual pass encapsulation for added protection.

Encapsulation material

- PP (Polypropylene) /TPR (Santoprene) / PA (Nylon) / PVDF / ETFE (Tefzel) / ECTFE (Halar) / FEP / PFA / ECA 3000 / PVC

Dimensional Tolerance for Chemical Injecton Line

ASTM A269 / ASME SA269, SS 316L (UNS S31603)
Size ODTolerance ODTolerance WT

1/8’’≤OD<3/16’’ (3.18≤OD<4.76 mm)

3/16≤OD<1/2’’ (4.76≤OD<12.7 mm)

1/2’’≤OD≤1’’ (12.7≤OD≤25.4 mm)

+0.003’’ (+0.08 mm) / -0

+0.004’’ (+0.10 mm) / -0

+0.005’’ (+0.13 mm) / -0




Meilong Tube Standard

Size ODTolerance ODTolerance WT

1/8’’ ≤OD<3/16’’ (3.18≤OD<4.76 mm)

3/16≤OD<1/2’’ (4.76≤OD<12.7 mm)

1/2’’≤OD≤1’’ (12.7≤OD≤25.4 mm)

+0.003’’ (+0.08 mm) / -0

+0.004’’ (+0.10 mm) / -0

+0.004’’ (+0.10 mm) / -0




Tests for Quality

Eddy current

Surface roughness


Dimensional analysis

Grain size

Rockwell hardness

Yield strength

Tensile strength



Positive material identification (PMI)

Corrosion resistance tests

Features of Encapsulated Chemical Injection Line Flatpack

- Maximize protection of downhole line

- Increase crush resistance during installation

- Protect control line against abrasion and pinching

- Eliminate long term stress corrosion failure of control line

- Improve clamping profile

- Single or multiple encapsulation for ease of running and added protection


Hydraulic control line flatpack is level wound coiled on the metal / drums or spools.

All drums are packed in wooden crates for easy logistic operation.

Profiles of Single & Multiple Injection Lines Encapsulation

Round section

1/4’’ OD line tubing0.433’’ Dia (11.0 mm)
3/8’’ OD line tubing0.535’’ Dia (13.6 mm)
1/2’’ OD line tubing0.660’’ Dia (16.8 mm)

Square section

1/4’’ OD line tubing0.433’’ x 0.433’’ (11.0 mm x 11.0 mm)
3/8’’ OD line tubing0.535’’ x 0.535’’ (13.6 mm x 13.6 mm)
1/2’’ OD line tubing0.660’’ x 0.660’’ (16.8 mm x 16.8 mm)

Rectangular section

1/4’’ OD line x 10.710’’ x 0.410’’ (18.0 mm x 10.4 mm)
1/4’’ OD line x 20.990’’ x 0.410’’ (25.1 mm x 10.4 mm)
1/2’’ OD line x 21.220’’ x 0.669’’ (31.0 mm x 17.0 mm)
1/2’’ OD line x 31.772’’ x 0.669’’ (45.0 mm x 17.0 mm)

Other sizes on request

Available Alloy Grades for Control Line Tubing Inside Encapsulation




Nickel alloy:



Encapsulation Materials

AbbreviationGeneric NameTrade NameMinimum Installation Temperature of Encapsulation Materials
ECTFEEthylene ChlorotrifluoroethyleneHalar®-60°C
ETFEEthylene TetrafluoroethyleneTefzel®-60°C
FEPFluorinated Ethylene PropyleneTeflon® FEP-100°C
HDPEHigh Density Polyethylene
PFAPerfluoroalkoxyTeflon® PFA-100°C
PVDFPolyvinylidene FluorideKynar®-20°C
TPO-PPThermoplastic polyolefinSantoprene®-20°C


- Capillary coiled alloy tubing for chemical injection

- Bare and encapsulated hydraulic control line coiled alloy tubing for subsea safety valves

- Velocity strings, work strings, and steel tube umbilicals

- Geothermal coiled alloy tubing

The Test Report from Following 3rd Parties can be Provided



- BV


Recent Reviews