Internal lining testing methods against depressurisation: ISO 15741 vs NACE TM0184
Contents ISO 15741, Annex C NACE TM 0185 Coating type Liquid epoxy as internal coating Plastic coating Objects Steel pipes and fittings Tubular good Media Non-corrosive gas phase; nitrogen Corrosive media ( H2S) and /or Chloride solution; hydrocarbon phase DFT 60~ 100 μm (4.3.3) Not specified temperature Not specified Elevated temperature required Pressurizing system Ramping 1 bar/min Continuous monitoring Depressurizing rate Release pressure rapidly ( no more than 5 min) Cool to 93oC, and depressurized at a uniform rate to ATM within 15~ 30 mins Testing panel Type I : 100 mm x 50 mmx 1 mm Type II: 100…
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