What are LTCS "333" Process Fittings*?
Lokring Technology is pleased to announce the release of a new Low Alloy Carbon Steel Solution for Sour Service applications.
The Lokring "333" Process Fitting is:
1. A NACE compliant fitting material (AISA/SAE 4130 (UNS G 41300) Low Alloy NACE Grade Carbon Steel) tested to NACE TMO-177 Method A.
2. Qualified for use on A333 (LTCS) Piping (Charpy Impact tested to - 46° C (-50° F) 85% minimum shear).
3. Designed for piping systems having a 1/8th inch or 3.2mm Corrosion Allowance.
Following extensive ASME Qualification Testing (Flexural Fatigue, Burst, Tensile & Torsion) Lokring has Couplings from 1/2" to 2" presently available and weld-free ANSI Flanges in production. They are now qualified for use on A333, A106, API5L Grade B & A53 Pipe - Schedule 40, 80 & 160.
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)
ASME B31 Qualifications Testing:
- Qualified for use on A333 Gr 6, A106, API 5L & A53 Grades B
- Schedule 40, 80 & 160**
Fitting Material Specification:
- AISI/SAE 4130 (UNS G 41300) Low Alloy NACE Grade Carbon Steel per Lokring material specifications LMS 97-22 & LMS 09-02
- Fittings have Blue Zinc Chromate plating to ASTM B633
Actual Test Description:
- Carbon Steel 4130 type material 1 1/2" & 2" Lokring Couplings on A333/A106 Pipe
- Internal exposure testing of the assemblies using NACE TM0 177 Solution A for a duration of 30 days
- Solution A is 5% NaCl acidified with 0.5% glacial acetic acid.
- Tests conducted at 1 atm of H2S at room temperature (76° F.) to assess Chloride Stress Corrosion Cracking (SCC) as well as Sulfide Stress Cracking (SSC)
- The solution & test specimens were initially deaerated with N2 followed by continuous purging of H2S for the duration
- PH was initially 2.7 and was replenished when PH reached 3.8
Key Observations & Conclusions:
- No evidence of Sulfide Stress Cracking (SSC) or Stress Corrosion Cracking (SCC) was observed in any samples
- Deemed suitable for sour service applications within the H2S partial pressure temperature limitations listed in NACE, MR0175, MR0103-2007 and ISO 15156
- Any temperature is allowed with a restrictive partial pressure of H2S of 15psia
* Patent Pending
** Except 3" and 4"
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