Waverley brownall offer one of the widest ranges of twin ferrule stainless steel O.D. compression fittings in the World. The Ringlok twin ferrule fittings were developed to satisfy the stringent needs of the oil, gas, petrochemical, refining, power and general process/instrumentation industries. The range provides optimum performance and value in the connection of tubes for high pressure or vacuum; elevated or cryogenic temperatures; vibration and impulse loading; corrosive or hazardous environments and media.
Ringlok twin ferrule OD compression fittings are available in a full range of metric and imperial sizes and thread forms. They are manufactured and stocked in 316 stainless steel, Monel 400 alloy and a large range of other exotic materials including Incoloy and Inconel.
- Low Torque assembly
- Low Stress joint
- High surface finish to all threads
- Silver plating on the internal surfaces of the compression nut
- All connecting threads are protected by colour coded plastic caps
- Quality management system to ISO 9001
- Cast code traceability
- Close tolerance tube location
- Corrosion resistant hard casing to back ring
- All parts manufactured to close tolerances
- Comprehensive assembly gauaging system
- Delivered assembled ready for use
- Fittings available in a wide range of materials
- Easy make-up of joint
- No Stress transmitted to tube
- No galling of threads during assembly
- Provides repeated break and re-make of the fitting without thread damage
- Prevention of thread damage and instant recognition of connecting end type
- Consistent product qulaity from a quality assured company
- All materials are traceable to original mill certificate
- Positive alignment of tube to fiting
- Safety and integrity in corrosive conditions
- Provides full interchangeability of Ringlok® components
- Quality control before system pressurisation
- Ready for immediate use
- Suitable for use in corrosive environments
To ensure the consistant performance of Ringlok® fittings and to enable accurate inspection of the assembled joint, a comprehensive gauging system has been developed. The Ringlok® gauging system enables quality control before system pressurisation and assists in the joint assembly. To achieve this degree of gaugeability the precision of each componenent in the fittings is scrupulously maintained, for this reason always use only genuine Ringlok® components throughout.
The Ringlok® gauging system is unique in that it indicates all conditions of assembly, from undertight through to overtight joints and full tube insertion into the fitting.
During the installation the tube is marked using a gauge as a guide. On insertion of the tube into the fittings, the mark will be 1.5mm from the back of the nut when the joint is correctly assembled.
Correct use of the gauge will ensure that safety and performance is maintained and, because inspection is completed before the system is pressurised, costs will be minimised.
In this condition the joint has not been tightened 1¼ turns which means the fitting is not fully assembled and should be tightened further until it gauges correctly.
In this condition the joint has been tightened 1¼ turns which means the fitting is fully assembled and is gauging correctly.
In this condition the joint has been overtightened more than 1¼ turns. Overtightened joints generally function correctly and in most cases do not need to be replaced.
Pre-Assembly tools are manufactured from hardened Maraging Steel and are designed to withstand repeated assemblies.
Pre-assembly is recommend
When fittings are to be used in confined spaces, or in locations where accessibility for in-situ assembly presents difficulties.
Where thick wall tubes or standpipe adaptors are to be used.
When using forged fittings where in-situ spannering of the forging body may present difficulties.
To reduce installation stresses when tube sizes exceed 1/2″ (12mm) OD.
As an aid to ensuring joints are made correctly as described and illustrated.
Note: Pre-assembly tools must be kept clean and lubricated at all times
Pre-Assembly tools are manufactured from hardened Maraging Steel and are designed to withstand repeated assemblies
Mixing components may not provide reliable joint assemblies and leakage could occur. Use only Ringlok® components for safety and reliability
- Cut the tube to the required length, leaving the ends square to the tube axis, remove all burrs.
- Insert the prepared tube into the fitting assembly, ensuring the tube end fully enters the fitting, engages in the abutment diameter and that the nut is finger tight.
- For 1/16″, 1/8″, 3/16″ OD, 3mm, 4mm OD size fittings, tighten the nut 3/4 of a turn from finger tight, to complete the assembly.
For all other sizes use 1 1/4 turns from finger tight.
For blanking plugs, tighten the nut 1/6 of a turn from finger tight.
Ringlok® fittings can be disassembled and re-assembled many times without impairing the function and efficiency of the joints.
- Prior to re-assembly ensure that the fitting body and tube assembly are free from any contaminant or damage.
- Insert the tube assembly into the fitting body until the sealrings seat firmly.
- Tighten the nut by hand. Rotate the nut 1/4 of a turn with a spanner or until the original one and a quarter turn position is reached, then if necessary tighten the nut a further small amount to ensure the assembly is positively sealed.
The following variables should be considered when ordering tube for use with Ringlok fittings i.e. Tubing material, hardness, wall thickness and surface finish. The following tables show the maximum working pressures of seamless tubes for use with Ringlok fittings. For tubes with a wall thickness other than those listed, information regarding safe work pressures can be obtained from our Technical Department.
Stainless steel tubing
Stainless steel tube should be fully annealed and conform to ASTM A269 or equivalent. A maximum hardness of Hv180 (HRB 80) is preferred, but if harder tube is used Hv200 (HRB 90) is the maximum allowed by ASTM A269. The working pressures in the tables are based on tubing rated at 75,000 psi minimum U.T.S. an allowable working stress of 20,000 psi as specified in ANSI B31.3 1987, for a temperature range of -29ºC to +38ºC