- Reduce the number of leaks
- Increase plant availability
- Reduce unplanned maintenance
- Reduce deferment costs
- Help meet the relevant statutory and/or corporate compliance with all of the relevant Safety, Health and Environmental policies
These services include:
Sulphide Stress Cracking Testing
We offer sour service materials qualification testing in accordance with the NACE MR0175/ISO 15156 as well as industry specifications and requirements as one of our specialized areas.This standard recommends testing to NACE TM0177 Method A, B, C and D tests for resistance of carbon / low alloy steels and CRAs to Sulphide stress corrosion cracking (SSC). These tests are performed in our accredited laboratories worldwide under the standard sour conditions or to specific field conditions.
- Tensile test in accordance with NACE TM0177, Method A
- Bent-Beam test in accordance with NACE TM0177, Method B and/or ISO 7539-2
- C-Ring test in accordance with NACE TM0177, Method C
- Double-Cantilever-Beam (DCB) test in accordance with NACE TM0177, Method D
HP/HT (High Pressure/High Temperature) Testing
Autoclaves are used to simulate the high pressure, high temperature conditions encountered downhole and in refinery operations. We have a range of these vessels with capacities in the range of 0.25 to 40 liters. These facilities permit bent beam tests and C-ring tests up to 500ºC and pressures up to 34.5 MPa in sour environments.
This equipment can also be used be used for HP/HT corrosion rate studies and for evaluation of corrosion inhibitor performance under harsh conditions. NACE TM0284 is a method for evaluating the resistance of pipeline and pressure vessel plate steels to hydrogen induced cracking (HIC) caused by hydrogen absorption from phenomena such as sulfide corrosion. HIC tests are carried out in our dedicated laboratories. Failed test pieces are examined for crack sensitivity ratio, crack length ratio and crack thickness ratio using our optical microscopes.
Hydrogen-Induced Cracking (HIC) Testing
NACE TM0284 is a method for evaluating the resistance of pipeline and pressure vessel plate steels to HIC caused by hydrogen absorption from aqueous sulfide corrosion. HIC tests are carried out in our dedicated laboratories. Failed test pieces are examined for crack sensitivity ratio, crack length ratio and crack thickness ratio using our optical microscopes.
Pitting Corrosion/Crevice Corrosion Testing
Pitting corrosion and crevice corrosion forms of localized corrosion attack are the cause of many failures in oil and gas operations. The study of steel resistant to this can be carried out in oxidizing chloride environments as per ASTM G48 Standard. Several methods are described in ASTM G48 including critical pitting temperature and critical crevice temperature. Electrochemical studies to look at critical pitting (CPP) and crevice potentials (CCP) is also a tool for evaluation of these materials resistance to this type of corrosion.
Electrochemical test techniques for corrosion rate determination, crevice and pitting corrosion resistance are in use for many applications. The most common use of this testing using Linear Polarization Resistance (LPR) and Electrochemical Impedance Spectroscopy (EIS) is for inhibitor evaluation. In our laboratories we can perform full inhibitor evaluations from compatibility testing through to performance testing in Bubble test, Dynamic Rotating Cylinder Electrode (RCE) testing and even flow loops. Electrochemical method are performed to international standards such as ASTM G5, ASTM G59 polarization resistance measurements and ASTM G61 cyclic potentiodynamic polarization measurements, which gives a measure of pitting and crevice corrosion resistance).
Corrosion Rate and Sensitization Testing
General corrosion rates calculated in mm per year can be performed to customers’ requirements (specified time and solution), using mass loss techniques described in both ASTM and NACE standards such as ASTM G28 and NACE TM0169.
Salt Spray Corrosion Testing
Salt spray and cyclic humidity/temperature corrosion testing can be done to such international specifications as ASTM B117 or to client specific requirements on test coupons, paints, platings, oil and plastics.
Slow Strain Rate SSR Testing
NACE TM0198 is a method used for quick screening Corrosion Resistant Alloy (CRA) materials for resistance to Stress Corrosion Cracking (SCC) at elevated temperatures in sour oilfield production environments, under constantly increasing strain rates.
Cyclic or Ripple SSRT can also be carried out to provide information on performance of materials under cyclic load around the AYS of the material.
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