The Lokring “333” Process Fitting is:
Following extensive ASME Qualification Testing (Flexural Fatigue, Burst), and also Tensile, Torsion & Fire Testing (API 6FB)
Lokring has Couplings & weld-free ANSI Flanges from 1/2″ to 4″ presently available from stock. Weld-free 90 Elbows are presently in production phase.
Fittings will meet the criteria of NACE MRO175 / ISO15156 and MR0103-2007 for Refineries.
Fitting Material Specification meets AISI /SAE 4130 (UNS G 41300) Low Alloy NACE Grade Carbon Steel Fittings have Blue Zinc Chromate plating to ASTM B633.
Typical Class: #150, #300, #600 & #1500
Temperature Range: -46° C (-50° F) to +204° C (+400° F) – currently under code review for increase.
This was conducted to see the impact of corrosion within the small cavity in the Lokring fitting design with the intent to evaluate the corrosion specific to a LTCS-333 Fitting and in comparison with a Socket Weld in the same solution.
The test was based on the principles of “ASTM G78 Standard Guide for Crevice Corrosion Testing of Iron-Base and Nickle-Base Stainless Alloys on Seawater and Other Chloride-Containing Aqueous Environments” for an accelerated 30 day test.
The test solution and exposure conditions as outlined in ASTM G78 utilized Test Solution A: 5.0 wt% sodium chloride and 0.5 wt% glacial acetic acid dissolved in distilled or de-ionized water (e.g., 50.0g of NaCl and 5.0g of CH3COOH dissolveed in 945g of distilled or de-ionized water).
As a result of this testing, Lokring is now pleased to endorse Lokring LTCS-333 Fittings for applications that customers feel may result in Crevice Corrosion. We would however suggest that you work closely with your Lokring representative to ensure all parties are comfortable with the overall system conditions and parameters. This Report is available on request.
When selecting Lokring fittings for use in any application, total system design must be considered to ensure a safe, trouble free performance. Material compatibility, system pressure and temperature ratings, adequate corrosion control or allowances, control of fluid velocities, fluid chemical treatment, proper installation, operation, and maintenance are the responsibilities of the system designer, owner, and operator.
* Patent Pending
** Except 3″ and 4″