SS316L Hydraulic Control Line Seamless Redrawn Stainless Steel Capillary Tubing

SS316L seamless and redrawn stainless steel capillary tubing control line

Meilong Tube specially manufactures seamless and redrawn, welded and redrawn coiled tubing which are made from corrosion-resistant austenitic, duplex, super duplex stainless steels and nickel alloy grades. The tubing is used as hydraulic control lines and chemical injection lines specially serving oil and gas, geothermal industry.

Typical Size of Stainless Steel Control Line

Outside diameter of control lines is mainly 1/4’’ (6.35mm).

Wall thicknesses: 0.035’’ (0.89mm), 0.049’’ (1.24mm), 0.065’’ (1.65mm)

Control line tubing is available in lengths from 400 feet (122 meters) to 32,808 feet (10,000 meters). No orbitally butt welds.

Other specifications (1/8’’ to 3/4’’) are available on request.

Alloy Tubing Properties

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

Continuous length without orbital joint welds

* 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

Precision Manufacturing

Meilong Tube operates from a complex of buildings totaling 20,000 square meters.

Tube Mill

Tubing is formed and gas-tungsten arc and laser beam welded from strip stock on multiple tube mills designed and fabricated by Meilong Tube.

Sinking Process

Sinking is a cold working process in which tubing is pulled through a lubricated die without an internal plug. For certain tubing dimensions, manufacturing process limitations prevent welding the tubing to final size. In such cases, the tubing is welded at a larger outside diameter and sunk in multiple reduction / heat treatment operations.

Floating-Plug Process

Floating-plug operation is a cold working process in which tubing is pulled through a lubricate die with an internal floating plug which controls inside diameter of tubing.

Heat Treatment

The tubing is heat-treated to achieve specified mechanical properties and corrosion resistance in an off-mill furnace with a reducing atmosphere.

Application Description for SSSV

A safety valve is a valve that acts as the protector of your equipment. Safety valves can prevent damage to your pressure vessels and even prevent explosions at your facility when installed in pressure vessels.

A safety valve is a type of valve that automatically actuates when the pressure of the inlet side of the valve increases to a predetermined pressure, to open the valve disc and discharge the fluid. The safety valve system is designed to be a fail-safe so that a wellbore can be isolated in the event of any system failure or damage to the surface production-control facilities.

In most cases, it is mandatory to have a means of closure for all wells capable of natural flow to the surface. The installation of a subsurface safety valve (SSSV) will provide this emergency closure capability. Safety systems may be operated on a fail-safe principle from a control panel located on the surface.

The SCSSV is controlled by a ¼” stainless steel control line that is attached to the outside of the well tubing string and installed when the production tubing is installed. Depending on the wellhead pressure, it may be necessary to keep as much as 10,000 psi on the control line to keep the valve open.

Other Applications

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

Alloys for Control Lines

Control Line Tubing Features

Close dimensional tolerances

Considerably enhanced mechanical properties

Superior surface finish

High cleanness of inside surface

Controlled ovality, eccentricity

Chemical Compositions of SS316L

SS316L is an austenitic chromium-nickel stainless steel with molybdenum and a low carbon content.

Alloy Tubing Weight per Meter (kg)

Stainless 316L (UNS S31603)

Tubing Process and Packing

Seamless- pierced, redrawn, annealed (multi-pass circulation process)

Welded- longitudinally welded, redrawn, annealed (multi-pass circulation process)

Packing- Tubing is level wound coiled on the metal / wooden drums or spools.

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