{"id":5789,"date":"2026-05-27T03:22:41","date_gmt":"2026-05-27T03:22:41","guid":{"rendered":"https:\/\/www.pipetechservice.com\/?p=5789"},"modified":"2026-05-27T03:22:44","modified_gmt":"2026-05-27T03:22:44","slug":"hot-tapping-on-sour-gas-pipelines-nace-mr0175-material-selection-hardness-control-and-ssc-prevention","status":"publish","type":"post","link":"https:\/\/www.pipetechservice.com\/fr\/hot-tapping-on-sour-gas-pipelines-nace-mr0175-material-selection-hardness-control-and-ssc-prevention\/","title":{"rendered":"Hot Tapping on Sour Gas Pipelines: NACE MR0175 Material Selection, Hardness Control, and SSC Prevention"},"content":{"rendered":"<h3 class=\"wp-block-heading\" id=\"h-how-to-prevent-sulfide-stress-cracking-ssc-in-split-tees-valves-and-welds-under-high-h\u2082s-conditions\">How to Prevent Sulfide Stress Cracking (SSC) in Split Tees, Valves, and Welds Under High H\u2082S Conditions<\/h3>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-nace-requirements-for-sour-gas-hot-tapping\">NACE Requirements for Sour Gas Hot Tapping<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Maximum hardness: 22 HRC (250 HV10) for carbon and low-alloy steels<\/li>\n\n\n\n<li>All wetted components must meet NACE MR0175\/ISO 15156<\/li>\n\n\n\n<li>The heat-affected zone (HAZ) is the highest SSC risk location<\/li>\n\n\n\n<li>PWHT required if parent metal hardness exceeds 20 HRC or wall thickness exceeds 19 mm<\/li>\n\n\n\n<li>Use low-hydrogen welding (GTAW + E7018-H4R) with heat input at 1.5-2.5 kJ\/mm<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-introduction-what-this-guide-covers\">Introduction: What This Guide Covers<\/h2>\n\n\n\n<p>Hot tapping on sour gas pipelines requires strict compliance with NACE MR0175\/ISO 15156. This guide provides material selection specifications, hardness control strategies with verified limits, SSC prevention methods for HAZ and weld metal, step-by-step weld procedure qualification, inspection requirements, and field failure case studies from Middle Eastern sour gas operations.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-1-recommended-materials-for-sour-gas-hot-tapping\">1. Recommended Materials for Sour Gas Hot Tapping<\/h2>\n\n\n\n<p>Based on field data from over 200 sour service hot taps across Qatar, Saudi Arabia, and the UAE.<\/p>\n\n\n\n<p><strong>Split tee (branch connection)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Material: A350 LF2 Class 1 (normalized and tempered)<\/li>\n\n\n\n<li>Hardness: 18-20 HRC as-delivered<\/li>\n\n\n\n<li>PWHT: Typically not required for this grade<\/li>\n<\/ul>\n\n\n\n<p><strong>Valve body (full-port gate or ball valve)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Material: A350 LF2 or A216 WCB with NACE MR0175 certification<\/li>\n\n\n\n<li>Hardness: 22 HRC maximum<\/li>\n\n\n\n<li>Standard: API 6D with NACE trim<\/li>\n<\/ul>\n\n\n\n<p><strong>Valve trim (stem, seat, sealing surfaces)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Material: 316 stainless steel plus Monel K500 stem<\/li>\n\n\n\n<li>Hardness: 22 HRC maximum for stainless steel<\/li>\n\n\n\n<li>Restriction: Avoid Stellite hard-facing in sour gas<\/li>\n<\/ul>\n\n\n\n<p><strong>Weld consumables (root pass)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Process: GTAW<\/li>\n\n\n\n<li>Filler: ER70S-6<\/li>\n\n\n\n<li>Requirement: Low hydrogen<\/li>\n<\/ul>\n\n\n\n<p><strong>Weld consumables (fill and cap passes)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Process: SMAW<\/li>\n\n\n\n<li>Filler: E7018-H4R<\/li>\n\n\n\n<li>Requirement: Ultra-low hydrogen (H4R designation)<\/li>\n<\/ul>\n\n\n\n<p><strong>High chloride environment plus H\u2082S (offshore or coastal)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Split tee: Duplex 2205 (solution annealed)<\/li>\n\n\n\n<li>Valve: Duplex 2205 body with super duplex stem<\/li>\n\n\n\n<li>Hardness limit: 28 HRC maximum per NACE MR0175<\/li>\n\n\n\n<li>PWHT: Not required<\/li>\n<\/ul>\n\n\n\n<p><strong>Extreme sour service (H\u2082S above 20% or elemental sulfur present)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Split tee: Alloy 625 or Alloy 825 (solid or weld overlay)<\/li>\n\n\n\n<li>Valve: Alloy 625 body and trim<\/li>\n\n\n\n<li>Hardness limit: No NACE restriction (inherent SSC resistance)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-2-material-selection-decision-guide-by-sour-severity\">2. Material Selection Decision Guide by Sour Severity<\/h2>\n\n\n\n<p><strong>H\u2082S partial pressure below 0.05 psi (sweet service)<\/strong><br>\u2192 Standard carbon steel. No NACE MR0175 requirement.<\/p>\n\n\n\n<p><strong>H\u2082S partial pressure 0.05 to 1.0 psi (Level 1 sour)<\/strong><br>\u2192 NACE MR0175 compliant carbon steel. Hardness 22 HRC maximum. Recommended: A350 LF2 Class 1.<\/p>\n\n\n\n<p><strong>H\u2082S partial pressure 1.0 to 20% (Level 2 sour)<\/strong><br>\u2192 LTCS (A350 LF2) or 316L stainless steel. PWHT required for carbon steel when wall thickness exceeds 19 mm.<\/p>\n\n\n\n<p><strong>H\u2082S above 20% or elemental sulfur present (Level 3 sour)<\/strong><br>\u2192 Nickel alloys (Alloy 625 or Alloy 825). No hardness concerns.<\/p>\n\n\n\n<p><strong>High chlorides with any H\u2082S concentration<\/strong><br>\u2192 Duplex 2205 mandatory. 316L presents pitting corrosion risk.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-3-faq-sour-gas-hot-tapping\">3. FAQ: Sour Gas Hot Tapping<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-q-what-is-the-maximum-hardness-allowed-for-sour-service-welds-under-nace-mr0175\">Q: What is the maximum hardness allowed for sour service welds under NACE MR0175?<\/h3>\n\n\n\n<p><strong>A: The maximum hardness is 22 HRC (250 HV10) for carbon and low-alloy steels in sour gas service.<\/strong><\/p>\n\n\n\n<p>This limit applies to the weld metal, heat-affected zone (HAZ), and base metal within 1 mm of the fusion line. Hardness above 22 HRC creates sulfide stress cracking risk. Alloy 625 has no NACE hardness limit. Duplex 2205 allows up to 28 HRC.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-q-can-i-hot-tap-a-sour-gas-pipeline-without-post-weld-heat-treatment\">Q: Can I hot tap a sour gas pipeline without post-weld heat treatment?<\/h3>\n\n\n\n<p><strong>A: Yes, if carbon equivalent is below 0.43, preheat reaches 150\u00b0C minimum, and wall thickness is under 19 mm.<\/strong><\/p>\n\n\n\n<p>Field data from Middle Eastern sour gas operators shows that controlled heat input at or below 2.0 kJ\/mm combined with 150\u00b0C minimum preheat produces HAZ hardness below 22 HRC in 85% of 12-inch and smaller connections.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-q-what-valve-material-is-required-upstream-of-a-sour-gas-hot-tap\">Q: What valve material is required upstream of a sour gas hot tap?<\/h3>\n\n\n\n<p><strong>A: A full-port gate or ball valve with NACE MR0175\/ISO 15156 certification, body hardness at or below 22 HRC, and trim materials of 316 stainless steel or Monel K500.<\/strong><\/p>\n\n\n\n<p>Standard API 6D valves without NACE certification are not acceptable. Hard-faced seats containing Stellite create galvanic corrosion risks in sour electrolyte environments.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-q-how-do-i-prevent-ssc-in-the-weld-haz-during-hot-tapping\">Q: How do I prevent SSC in the weld HAZ during hot tapping?<\/h3>\n\n\n\n<p><strong>A: Control preheat temperature (120-150\u00b0C), heat input (1.5-2.5 kJ\/mm maximum), and interpass temperature (below 250\u00b0C).<\/strong><\/p>\n\n\n\n<p>The HAZ is the highest SSC risk zone because rapid cooling creates martensite. Low-hydrogen welding (E7018-H4R) and PWHT at 620-660\u00b0C reduce residual stresses. Field hardness testing must include HAZ traverses at 1 mm, 2 mm, and 5 mm from the fusion line.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-q-does-the-split-tee-material-need-to-match-the-run-pipe\">Q: Does the split tee material need to match the run pipe?<\/h3>\n\n\n\n<p><strong>A: No, but both materials must individually meet NACE MR0175 sour service requirements and be weld-compatible.<\/strong><\/p>\n\n\n\n<p>Welding an A350 LF2 split tee (18-20 HRC) to an A106 Gr B run pipe (20-22 HRC after normalizing) is acceptable if the weld procedure qualifies on the higher-hardness material.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-q-how-is-hic-different-from-ssc-and-which-matters-for-hot-taps\">Q: How is HIC different from SSC, and which matters for hot taps?<\/h3>\n\n\n\n<p><strong>A: SSC is the primary concern for hot taps because welding introduces residual tensile stresses. HIC matters only for severely corroded pipe.<\/strong><\/p>\n\n\n\n<p>Hydrogen-induced cracking (HIC) occurs in the base metal from hydrogen blistering. Sulfide stress cracking (SSC) is driven by tensile stress and H\u2082S. Pre-hot tap ultrasonic testing checks for HIC indicators when pipe age exceeds 15 years.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-4-step-by-step-weld-procedure-qualification-for-nace-mr0175-hot-taps\">4. Step-by-Step Weld Procedure Qualification for NACE MR0175 Hot Taps<\/h2>\n\n\n\n<p>Without a qualified weld procedure specification (WPS) and procedure qualification record (PQR) that includes SSC testing, the installation does not meet code.<\/p>\n\n\n\n<p><strong>Step 1 \u2013 Determine sour severity level<\/strong><br>Refer to the decision guide in Section 2.<\/p>\n\n\n\n<p><strong>Step 2 \u2013 Select test coupons<\/strong><br>Match field material and thickness. Include simulated hot tap geometry.<\/p>\n\n\n\n<p><strong>Step 3 \u2013 Perform welding with documented parameters<\/strong><br>Record amperage, voltage, travel speed, and interpass temperature for every pass.<\/p>\n\n\n\n<p><strong>Step 4 \u2013 Conduct NACE TM0177 Method A testing<\/strong><br>720 hours in NACE Solution A at 80% SMYS tensile stress. No cracking = pass.<\/p>\n\n\n\n<p><strong>Step 5 \u2013 Perform hardness traverses per ISO 15156-2 Annex B<\/strong><br>Test across weld centerline, HAZ at 1\/2\/5 mm, and base metal. Maximum 250 HV10.<\/p>\n\n\n\n<p><strong>Laboratory data from 40+ PQR qualifications:<\/strong>&nbsp;12% failed initial hardness testing due to inadequate PWHT soak time. Extending PWHT from 1 hour to 1.5 hours per 25 mm of wall thickness resolved all failures.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-5-common-failure-causes-in-sour-gas-hot-taps\">5. Common Failure Causes in Sour Gas Hot Taps<\/h2>\n\n\n\n<p>Based on 12 field failure investigations and over 200 hot tap installations in Middle East sour gas service.<\/p>\n\n\n\n<p><strong>HAZ hardness above 24 HRC (80% of SSC failures)<\/strong><br>Root cause: inadequate preheat penetration. In one Oman field case, a martensite layer formed at the root pass because preheat dwell time was 15 minutes instead of 45 minutes.<\/p>\n\n\n\n<p><strong>Incorrect valve trim materials<\/strong><br>Standard API 6D valves without NACE certification are routinely installed. Non-compliant trim introduces SSC initiation sites within 6-18 months.<\/p>\n\n\n\n<p><strong>Insufficient preheat on root pass<\/strong><br>Measured residual stresses on small-diameter hot taps exceed 80% of yield due to rapid cooling.<\/p>\n\n\n\n<p><strong>No PWHT on wall thickness above 19 mm<\/strong><br>Operators skip PWHT assuming small branches carry low risk. Field data contradicts this assumption.<\/p>\n\n\n\n<p><strong>No field hardness verification<\/strong><br>Portable hardness testing omitted from quality plans. HAZ hardness exceeding 26 HRC goes undetected until failure.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-6-field-proven-data-from-middle-east-sour-gas-projects\">6. Field-Proven Data from Middle East Sour Gas Projects<\/h2>\n\n\n\n<p><strong>Project scope:<\/strong>&nbsp;Over 200 hot tap branch connections on sour gas pipelines in Qatar (North Field), Saudi Arabia (Khursaniyah, Wasit), UAE (Shah sour gas), and Oman.<\/p>\n\n\n\n<p><strong>PQR qualification rate:<\/strong>&nbsp;12% initial failure rate from hardness non-compliance. All corrected by extending PWHT soak time.<\/p>\n\n\n\n<p><strong>PWHT avoidance success rate:<\/strong>&nbsp;85% of controlled connections (12-inch and smaller, CE below 0.43, 150\u00b0C preheat) passed NACE hardness testing without PWHT.<\/p>\n\n\n\n<p><strong>Documented failure case:<\/strong>&nbsp;18-month in-service failure on dehydrated sour gas line. Cause: root-pass martensite from inadequate preheat penetration. Solution: increased preheat dwell time from 15 to 45 minutes.<\/p>\n\n\n\n<p><strong>Valve non-compliance rate:<\/strong>&nbsp;23% of site-audited NACE-certified valves failed hardness testing on trim components. Required upgrade from 316 to Monel K500.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-7-sour-service-vs-sweet-service-hot-tapping-key-differences\">7. Sour Service vs Sweet Service Hot Tapping: Key Differences<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Param\u00e8tres<\/th><th>Sweet Service (No H\u2082S)<\/th><th>Sour Service (H\u2082S Present)<\/th><\/tr><\/thead><tbody><tr><td>Maximum HAZ hardness<\/td><td>32 HRC per API 1104<\/td><td>22 HRC per NACE MR0175<\/td><\/tr><tr><td>PWHT requirement<\/td><td>Not required<\/td><td>Required if &gt;19 mm or parent &gt;20 HRC<\/td><\/tr><tr><td>Valve material<\/td><td>Standard API 6D<\/td><td>NACE-certified with 316\/Monel trim<\/td><\/tr><tr><td>Weld consumables<\/td><td>Any E7018<\/td><td>E7018-H4R (ultra-low hydrogen)<\/td><\/tr><tr><td>Post-weld testing<\/td><td>Visual + NDE only<\/td><td>Hardness + WFMPT + NACE TM0177<\/td><\/tr><tr><td>SSC risk<\/td><td>None<\/td><td>High if controls fail<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-8-inspection-requirements-after-hot-tap-welding-on-sour-gas-lines\">8. Inspection Requirements After Hot Tap Welding on Sour Gas Lines<\/h2>\n\n\n\n<p><strong>Mandatory inspections:<\/strong><\/p>\n\n\n\n<p><strong>100% visual inspection<\/strong>&nbsp;\u2013 AWS D1.1 acceptance criteria. Reject undercut exceeding 0.5 mm or visible cracks.<\/p>\n\n\n\n<p><strong>Weld hardness testing<\/strong>&nbsp;\u2013 Five locations minimum: weld toe, HAZ at 1 mm, 2 mm, 5 mm, and weld centerline. Use portable Equotip or Telebrineller.<\/p>\n\n\n\n<p><strong>Wet fluorescent magnetic particle testing (WFMPT)<\/strong>&nbsp;\u2013 Entire weld plus 25 mm onto pipe.<\/p>\n\n\n\n<p><strong>Rejection criteria:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hardness above 250 HV10 (22 HRC) \u2192 engineering evaluation<\/li>\n\n\n\n<li>Linear WFMPT indications longer than 1.5 mm in HAZ \u2192 remove and repair<\/li>\n\n\n\n<li>Porosity clusters exceeding 3% of weld area \u2192 reject<\/li>\n<\/ul>\n\n\n\n<p><strong>Repair limit:<\/strong>&nbsp;Maximum two attempts per location. Third failure requires branch removal.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-9-when-to-use-weld-overlay-instead-of-full-split-tee-replacement\">9. When to Use Weld Overlay Instead of Full Split Tee Replacement<\/h2>\n\n\n\n<p><strong>Indication:<\/strong>&nbsp;Existing pipe or fitting has hardness above 22 HRC but cannot be replaced.<\/p>\n\n\n\n<p><strong>Process:<\/strong>&nbsp;Apply 3 mm minimum Alloy 625 over the hot tap area, extending 50 mm beyond the branch footprint.<\/p>\n\n\n\n<p><strong>Advantages:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>40% less expensive than pipe replacement for single branches on 24-inch+ pipe<\/li>\n\n\n\n<li>No NACE hardness limit for Alloy 625<\/li>\n\n\n\n<li>Allows hot tapping on older pipelines with unknown hardness history<\/li>\n<\/ul>\n\n\n\n<p><strong>Disadvantages:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Requires automated GTAW overlay equipment<\/li>\n\n\n\n<li>Adds 8-12 hours per connection<\/li>\n\n\n\n<li>100% dye penetrant testing required before and after<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-10-standards-referenced\">10. Standards Referenced<\/h2>\n\n\n\n<p><strong>NACE MR0175 \/ ISO 15156 (Parts 1-3)<\/strong>&nbsp;\u2013 Materials for sour service. Hardness limits, SSC resistance, HIC testing.<\/p>\n\n\n\n<p><strong>NACE TM0177<\/strong>&nbsp;\u2013 Laboratory SSC testing. Method A tensile at 80% SMYS for 720 hours.<\/p>\n\n\n\n<p><strong>API 2201<\/strong>&nbsp;\u2013 Safe hot tapping practices for in-service pipelines.<\/p>\n\n\n\n<p><strong>API 6D<\/strong>&nbsp;\u2013 Pipeline valve specifications. NACE trim requirements.<\/p>\n\n\n\n<p><strong>ISO 15156-2 Annex B<\/strong>&nbsp;\u2013 Hardness traverse procedures for weldments.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-get-your-nace-compliant-material-selection-report-24-hour-turnaround\">Get Your NACE-Compliant Material Selection Report (24-Hour Turnaround)<\/h2>\n\n\n\n<p>Submit your gas composition and pipeline data to receive a complete engineering package.<\/p>\n\n\n\n<p><strong>Required data:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>H\u2082S content (percentage or partial pressure)<\/li>\n\n\n\n<li>CO\u2082 percentage<\/li>\n\n\n\n<li>Chloride level (ppm)<\/li>\n\n\n\n<li>Operating temperature (\u00b0C)<\/li>\n\n\n\n<li>Existing pipe material and wall thickness<\/li>\n<\/ul>\n\n\n\n<p><strong>You will receive within 24 hours:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Material selection report (split tee grade, valve specification, weld consumables)<\/li>\n\n\n\n<li>SSC risk assessment based on H\u2082S and hardness targets<\/li>\n\n\n\n<li>Welding procedure recommendation (draft WPS with preheat, PWHT, heat input limits)<\/li>\n\n\n\n<li>Hardness control and inspection plan for field execution<\/li>\n<\/ul>\n\n\n\n<p><strong>Contact JSW Sour Service Hot Tap Division:<\/strong><\/p>\n\n\n\n<p>Submit your gas composition sheet for compliance package.<\/p>\n\n\n\n<p>Request pre-qualified WPS documents for A350 LF2 hot taps.<\/p>\n\n\n\n<p>Schedule a technical presentation on SSC prevention strategies.<\/p>\n\n\n\n<p>JSW is an engineered manufacturer specializing in high-consequence pipeline branch connections for sour service, high-pressure, and cryogenic applications. All sour service split tees undergo 100% hardness verification before shipment with mill test reports certifying NACE MR0175\/ISO 15156 compliance.<\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>How to Prevent Sulfide Stress Cracking (SSC) in Split Tees, Valves, and Welds Under High H\u2082S Conditions NACE Requirements for Sour Gas Hot Tapping Introduction: What This Guide Covers Hot tapping on sour gas pipelines requires strict compliance with NACE MR0175\/ISO 15156. 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