
The Best Material For Downhole Capillary Tube: Duplex 2205 vs. Stainless Steel 316L
We put Duplex 2205 and Stainless Steel 316L head-to-head to see which is best for
Due to our unique manufacturing processes and strict quality control, our 3/8” capillary tube outperforms the best on the market.
0.375″ Capillary Tube Duplex 2205 0.035″
Our Duplex 2205 Capillary Line is ideal for use in oil and natural gas wells due to its higher strength, resistance to pitting, corrosion, and chloride stress corrosion cracking. For injection applications, the tubing is self-supporting inside the production casing and facilitates the injection of chemicals to enhance production flow rate, inhibit corrosion and de-water. In control line applications, the tubing is strapped to the production casing and facilitates the hydraulic actuation of surface-controlled subsurface equipment such as valves.
General Properties
2205 is a nitrogen-enhanced duplex stainless steel alloy. When heat-treated, the composition of 2205 (Listed below) produces a microstructure of a roughly equal mixture of austenitic and ferritic phases that results in a yield strength approximately double that of austenitic alloys such as 316L, as well as superior corrosion resistance in many hostile environments.
The higher chromium content in 2205, as well as the molybdenum and nitrogen components, results in better chloride pitting and crevice corrosion resistance than found in standard austenitic stainless steels such as 304L and 316L.
Forming & Annealing Process
The strip is passed through a series of rollers to form it into a tubular cross-section. The tubing is continuously welded along the seam with a gas tungsten arc welding (GTAW) process. To achieve the desired length of tubing, individual lengths are joined by orbital welding. Continuous eddy current testing is performed to detect holes. Exiting the tube mill, the tubing is passed through an induction coil and annealed at between 1,070°C – 1,100°C.
Technical Specifications
Applications
Additional Information
We recommend the use of gaugeable Alloy 2507 Super Duplex Tube Fittings to ensure reliable grip and seal with the 2205 Capillary Tubing.
Specifications
Duplex 2205 Chemistry
(by weight)
Carbon (C)
0.018%
Manganese (Mn)
1.64%
Silicon (Si)
0.56%
Chromium (Cr)
22.2%
Nickel (Ni)
5.32%
Molybdenum (Mo)
3.11%
Phosphorus (P)
0.026%
Sulfur (S)
0.0001%
Iron (Fe)
Balance
Nitrogen (N)
0.17%
Physical & Mechanical Properties
Outer Diameter
0.375” (1)
Wall Thickness
0.035” (1)
Weight
0.1265 lbs/ft
Burst Pressure
17,700 psi (2)
Internal Pressure
13,000 psi (3)
Collapse Pressure
11,800 psi (4)
Working Pressure
9,400 psi (5)
Test Pressure
10,800 psi (6)
PREN
(Pitting Resistance Equivalent Number)
35.2 (7)
Metal Cross Section
0.0374 in2
Flow Cross Section
0.0731 in2
Minimum Tensile Strength
95,000 psi (8)
Minimum Yield Strength
70,000 psi (8)
Minimum Elongation
25% (8)
Hardness (HRC Max)
30 (9)
(1) Dimension Tolerances per ASTM A632-19: O.D. +0.004”, -0.000”; I.D. +0.000”, -0.004”; WT ± 10%
(2) Calculated using Barlow’s formula at Tensile Strength (ASTM A312).
(3) Calculated using Barlow’s formula at Minimum Yield Strength.
(4) Collapse pressure calculated per API 5C3.
(5) Working pressure is defined as Internal Pressure x 0.72 Fd (design factor).
(6) Testing recommended at 15% above Working Pressure.
(7) (%Cr + 3.3%Mo + 16%N), API Technical Report 938-C, 2nd Edition, 2011.
(8) Tensile tests conform to ASTM A370-19e1, using yield strength method 0.2% offset.
(9) Vickers 500g (HV0.5) hardness test conforms to ASTM E384-17. Rockwell Hardness conversion per ISO 18265-2003.
* The data are typical and subject to normal manufacturing tolerances. The data are provided for information purposes and should not be construed as maximum or minimum values for specification or design purposes. The data are subject to change at any time without notice.
Have you subscribed to our newsletter yet? We share company news, product updates, and insights into the oil & gas industry.
We put Duplex 2205 and Stainless Steel 316L head-to-head to see which is best for
We are proud to officially announce the all new GEOXTR 18pt Thermocouple Input Card! A
We are proud to announce that along with our partner Silixa we have been awarded
We are proud to announce that the product that started it all for us here
We are proud to officially announce our industry-leading Capillary Tube product line! A New Offering,
Our innovative gauge solution enabling the future of wireless downhole monitoring. The Wireless Monitoring Dream
The ESP Mini 125 is the world’s smallest downhole ESP gauge. It enables economic monitoring
Our team has recently completed another successful permanent downhole fiber optic cable & gauge installation.
An exclusive behind-the-scenes tour of our new and improved Canadian headquarters! Ever wanted to see
We have leveraged our position as a world leader in real-time downhole monitoring solutions to
How downhole monitoring impacts the efficiency of Gas Lift operations. Critical Factors For Gas Lift
How downhole gauges are used as a part of the measurement, monitoring, and verification plan
How our revolutionary GEOTRU technology enables monitoring at extremely high temperatures and provides data quality
Downhole Monitoring Basics: How utilizing real-time downhole data can help maximize operational safety This is
Downhole Monitoring Basics: How utilizing real-time downhole data can help maximize estimated ultimate recovery This
Downhole Monitoring Basics: How utilizing real-time downhole data can help maximize production This is part
Downhole Monitoring Basics: How utilizing real-time downhole data can help reduce equipment failures and minimize
Downhole Monitoring Basics: How utilizing real-time downhole data can help reduce spending and maximize capital
When it comes to Downhole Tubing Encapsulated Cable (TEC) do you really get what you
It’s lightning season – Are your downhole gauges and surface electronics protected? It’s spring again,
A look at how continued capital investment enables us to develop innovative solutions for unique
A look at how our approach of becoming a technology partner differs from product vendors
We here at GEO PSI are extremely proud to announce that we are now API
A look at our first 12 years of innovation, achievement, and excellence in downhole TEC
Kiss your flask good-bye! How real-time data acquisition provides a superior solution over memory tools
How exceptional workmanship and intuitive design makes for the most reliable and user-friendly surface data
Utilizing Enhanced Vibration monitoring and machine learning software to predict unplanned workovers and reduce downtime.
An exclusive behind the scenes tour of our Canadian headquarters. Ever wanted to see what’s
Cost-effective and reliable measurement solutions for even the most unique applications. Landfill Leachate Management Modern
Our eSlicklineTM cable has revolutionized how oil & gas operators plan and execute their wireline
Fill out this short questionnaire and one of our experienced team members will show you a solution designed to match the specific requirements of your application.
One of our dedicated support team members would be happy to help
Africa Sales Contact
Europe – MENA Sales Contact
South-Central America Sales Contact
USA Sales Contact
Canada Sales Contact
Asia Pacific Sales Contact