Waverley Brownall supply a large range of stainless steel tube in a range of OD sizes and wall thicknesses.
Tube Sizes
3 metre lengths as standard, 6 metre lengths available on request.
All sizes that are featured on the charts below are readily available. We can supply tubing in more sizes on request.
Temperature Range: -29C to +38C. For tubing with a wall thickness other than those featured on our charts, contact us for safe working pressure allowances.
Duoloc single ferrule and Ringlok twin ferrule connectors for use with tubing rated at 75,000 psi minimum UTS and allowable working stress of 20,000 psi as specified in ANSI B31.3 1987.
Special Metals
Tube manufactured in special metals such as Hastelloy and Inconel can be supplied on request. The recommended maximum working pressure for alloy 400 tubing can be found at the bottom of this page.
Our tube is available in seamless, round or polished finishes.
Industry specifications: ASTM A262, NACE MR0175 (on request), EN 10204 Certification (on request).
Instrumentation Tube
Oil and gas extraction and other applications of flow control rely on the durability of instrumentation tubing. Common sizes include ¼” and ½” OD Gauge tube, which we supply to companies such as Scotia Gas Networks and National Grid.
Stainless steel tubing can be accompanied by compression tube fittings and valves in order to complete the system. The material grade of our stainless steel is 316 – a material that is durable and reliable in a number of applications.
Corrosive environments will require high-performance alloys that can withstand attack from the media. We can supply tube in materials such as Incoloy 825, Monel alloy 400 and Super Duplex that are corrosion resistant with increased longevity. Lead time for the supply of special metal tubing will be longer than that of 316, however, we aim for timely delivery to every customer.
Instrumentation and precision components can be used in a number of applications where media is being transported, measured or otherwise controlled.
The tubing will need to be durable and compatible with OD tube fittings that are either single or twin-ferruled. Tube fittings such as stud couplings, elbows and tees are installed into a system to often direct the flow of the internal media.
Pictured: Diagram of tubing dimensions and wall thickness
For areas of high pressure and temperature, the psi rating (pressure) must be compatible with the tube and instrumentation.
Other areas of consideration include the tubing material, hardness, wall thickness and surface finish.
Waverley Brownall use OD as standard for measurement, which is the outside diameter of the steel tube. This is sometimes referred to as Gauge tube.
Tube Specifications, ASTM Standards
ASTM Tube requirements include: A450/A450M General Requirements for Carbon, Ferritic Alloy, and Austenitic Alloy Steel Tubes, A370, A213/A213M, A249/A249M, A268/A268M, A269 Seamless and Welded Austenitic Stainless Steel Tubing for General Service, A270, A511, A554, A632, A778, A789/A789M Austenitic (Duplex) Stainless Steel Tubing, A791/A791M, A803/A803M.
316 Stainless Steel Tube
Compared with grade 304, the added molybdenum in grade 316 increases overall corrosion and pitting resistance. It is one of the most widely used materials within industrial environments.
Stainless Steel grade 316 (UNS S31600) is the second most popular grade within the stainless steel family. It is not to be confused with 316L (low carbon) or 316H (higher carbon.) With and without filler metals, grade 316 has excellent weldability.
Its ability to resist pitting and crevice corrosion in warm chloride environments is just one of its impressive feats. Ordinary rusting seen on other materials can also be resisted, making it the steel grade choice for the architecture and structural industries.
316 stainless steel is used in the majority of food processing environments; however, Duplex and Super Duplex are commonly found. 316 stainless steel tubing will provide you with a good solution for many installations, including pipeline transport. Our tube and tubular fittings are often safe for working with gas, vapour and liquids (with consideration to temperature and pressure.)
Application With Stainless Steel And Carbon Steel Tube
Single Ferrule Duoloc
The application of single ferrule compression fittings with tube comes with various features and benefits. Single ferrule tube fittings have a safe make-up of joint and there is no galling of the threads during assembly.
The tube end is located in the tube abutment; this prevents misalignment of the joint upon application. A Duoloc ferrule swage will protect the tube bite from vibration and prevents excessive stresses getting passed to the tube.
The gauging system of Duoloc fittings ensures that it has been assembled correctly and that the tube is fully inserted into the abutment.
Full assembly instructions for 1/8” OD and 3/16” OD compression couplings for stainless and nylon tubing can be found on page 7 of our Duoloc catalogue.
Twin Ferrule Ringlok
Some of the benefits of our twin ferrule tube fittings include no stress being transmitted to the stainless steel tube, no galling of threads and positive alignment. During installation, tube will be marked with a gauge as a guide. On insertion of the tube into the fitting, the mark will be 1.5mm from the back of the nut when the joint is correctly assembled.
Our twin ferrule gauging system brings quality control to the forefront of your installation. Full assembly details can be found on page 7-9 of the Ringlok catalogue. A tube selection guide can be found on page 11. The recommended maximum working pressure for seamless 316 tubing at ASTM A269 can be found here.
Catalogues
Interchangeability
Tube fittings are fully interchangeable with their dedicated range (Duoloc, Ringlok) – however, our tubular products are not interchangeable with other manufacturer’s items.
Example – Do not attempt to interchange WB bodies with nuts and ferrules manufactured by other brand names. The fittings will not fit correctly in this way. Parts that are forced in place are a huge health and safety risk and the consequences are potentially fatal.
Monel Alloy 400 Tubing
Recommended maximum working pressure for alloy 400 tubing:
For use with Ringlok (twin ferrule) compression fittings, tubing should be fully annealed and conform to ASTM B165-1987 or equivalent.
For seamless nickel-copper alloy UNS 4400 tubing with a minimum UTS of 70,000 psi and 18,700 psi allowable working stress. The tube shall have a maximum hardness of Hv 170 (HRB 75).
For working pressures above ambient temperature multiply by the factor in the table.
