Title Module 4 – Manifold System RBI.pdf ✅

CHESS SUBSEA ENGINEERING – INNOVATIVE SOLUTIONS Subsea Systems Risk Based Inspection (RBI) Module 4 – Manifold System RBI Outline  Introduction  Subsea Manifold Degradation Mechanism  Subsea Manifold RBI Basis Assessment  Subsea RBI Detailed Assessment  RBI Planning Introduction Manifolds are designed to combine, distribute, control, and sometimes monitor fluid flow. It consists mainly of an arrangement of piping’s and or valves. Degradation Mechanism Main degradation mechanisms associated with subsea manifold are:  Internal corrosion (IC);  External corrosion (EC);  Internal Erosion (IE);  External impact (EI). CoF Identification The CoF basic assessment is divided into three categories and ranked qualitatively as described below  Economic consequences i.e. cost of repairs and business loss due to interruptions in production (see Table 4.0).  Environmental Consequences i.e. impact of various types of production release to the environment and the cost of cleanup (see Table 4.1).  Safety Consequences i.e. personnel injury. Basic Assessment CoF Identification Key Table 4.0: Economic consequence rankings for different events. CHESS SUBSEA ENGINEERING – INNOVATIVE SOLUTIONS Subsea Systems Risk Based Inspection (RBI) Module 4 – Manifold System RBI Outline  Introduction  Subsea Manifold Degradation Mechanism  Subsea Manifold RBI Basis Assessment  Subsea RBI Detailed Assessment  RBI Planning Introduction Manifolds are designed to combine, distribute, control, and sometimes monitor fluid flow. It consists mainly of an arrangement of piping’s and or valves. Degradation Mechanism Main degradation mechanisms associated with subsea manifold are:  Internal corrosion (IC);  External corrosion (EC);  Internal Erosion (IE);  External impact (EI). CoF Identification The CoF basic assessment is divided into three categories and ranked qualitatively as described below  Economic consequences i.e. cost of repairs and business loss due to interruptions in production (see Table 4.0).  Environmental Consequences i.e. impact of various types of production release to the environment and the cost of cleanup (see Table 4.1).  Safety Consequences i.e. personnel injury. Basic Assessment CoF Identification Key Table 4.0: Economic consequence rankings for different events. CHESS SUBSEA ENGINEERING – INNOVATIVE SOLUTIONS Subsea Systems Risk Based Inspection (RBI) Module 4 – Manifold System RBI Outline  Introduction  Subsea Manifold Degradation Mechanism  Subsea Manifold RBI Basis Assessment  Subsea RBI Detailed Assessment  RBI Planning Introduction Manifolds are designed to combine, distribute, control, and sometimes monitor fluid flow. It consists mainly of an arrangement of piping’s and or valves. Degradation Mechanism Main degradation mechanisms associated with subsea manifold are:  Internal corrosion (IC);  External corrosion (EC);  Internal Erosion (IE);  External impact (EI). CoF Identification The CoF basic assessment is divided into three categories and ranked qualitatively as described below  Economic consequences i.e. cost of repairs and business loss due to interruptions in production (see Table 4.0).  Environmental Consequences i.e. impact of various types of production release to the environment and the cost of cleanup (see Table 4.1).  Safety Consequences i.e. personnel injury. Basic Assessment CoF Identification Key Table 4.0: Economic consequence rankings for different events.
CHESS SUBSEA ENGINEERING – INNOVATIVE SOLUTIONS Subsea Systems Risk Based Inspection (RBI) Module 4 – Manifold System RBI Table 4.1: Environmental Consequence Rankings Table 4.2: Safety Consequence Rankings Figure 1.0: Subsea Manifold CHESS SUBSEA ENGINEERING – INNOVATIVE SOLUTIONS Subsea Systems Risk Based Inspection (RBI) Module 4 – Manifold System RBI Table 4.1: Environmental Consequence Rankings Table 4.2: Safety Consequence Rankings Figure 1.0: Subsea Manifold CHESS SUBSEA ENGINEERING – INNOVATIVE SOLUTIONS Subsea Systems Risk Based Inspection (RBI) Module 4 – Manifold System RBI Table 4.1: Environmental Consequence Rankings Table 4.2: Safety Consequence Rankings Figure 1.0: Subsea Manifold
CHESS SUBSEA ENGINEERING – INNOVATIVE SOLUTIONS Figure 4.1: PoF Identification during basic assessment Basic Assessment PoF Identification Subsea Systems Risk Based Inspection (RBI) Module 4 – Manifold System RBI A workflow for PoF identification during the preliminary assessment is shown on Figure 4.1 below. Table 4.3: PoF Category for External Corrosion of Manifold Depending on Inspection Results Sample Note: MAOP = Maximum Allowable Operating Pressure PoF Assessment for External Corrosion CHESS SUBSEA ENGINEERING – INNOVATIVE SOLUTIONS Figure 4.1: PoF Identification during basic assessment Basic Assessment PoF Identification Subsea Systems Risk Based Inspection (RBI) Module 4 – Manifold System RBI A workflow for PoF identification during the preliminary assessment is shown on Figure 4.1 below. Table 4.3: PoF Category for External Corrosion of Manifold Depending on Inspection Results Sample Note: MAOP = Maximum Allowable Operating Pressure PoF Assessment for External Corrosion CHESS SUBSEA ENGINEERING – INNOVATIVE SOLUTIONS Figure 4.1: PoF Identification during basic assessment Basic Assessment PoF Identification Subsea Systems Risk Based Inspection (RBI) Module 4 – Manifold System RBI A workflow for PoF identification during the preliminary assessment is shown on Figure 4.1 below. Table 4.3: PoF Category for External Corrosion of Manifold Depending on Inspection Results Sample Note: MAOP = Maximum Allowable Operating Pressure PoF Assessment for External Corrosion
CHESS SUBSEA ENGINEERING – INNOVATIVE SOLUTIONS Subsea Systems Risk Based Inspection (RBI) Module 4 – Manifold System RBI Table 4.2: Years of Operating for a One-Unit Increase in PoF Category for External Corrosion PoF Assessment for Internal Erosion Fluid velocity is a very important parameter when considering erosion, because the erosion rate is proportional to the power of 2.5 to 3.0 for the velocity. Table 4.3: Operating Years for a One-Unit Increase in PoF Category for Internal Erosion Note: The defect characteristics of internal erosion can be similar to corrosion defects, and the same inspection categorization as for corrosion defects can be used. Again, the PoF increases with time due to potential growth of erosion defects. High velocities will result in a more rapid increase in the PoF, and the number of years for a one - unit increase of PoF is therefore dependent on sand (product) velocity. Table 4.3 shows operating years for a one-unit increase in PoF category for internal erosion. If sand is not present, the PoF is constant with time and it is equivalent to 1. PoF Assessment for External Impact Damage due to external impact may rise from any of the following:  dropped objects  anchor impacts  anchor dragging  Trawling etc. CHESS SUBSEA ENGINEERING – INNOVATIVE SOLUTIONS Subsea Systems Risk Based Inspection (RBI) Module 4 – Manifold System RBI Table 4.2: Years of Operating for a One-Unit Increase in PoF Category for External Corrosion PoF Assessment for Internal Erosion Fluid velocity is a very important parameter when considering erosion, because the erosion rate is proportional to the power of 2.5 to 3.0 for the velocity. Table 4.3: Operating Years for a One-Unit Increase in PoF Category for Internal Erosion Note: The defect characteristics of internal erosion can be similar to corrosion defects, and the same inspection categorization as for corrosion defects can be used. Again, the PoF increases with time due to potential growth of erosion defects. High velocities will result in a more rapid increase in the PoF, and the number of years for a one - unit increase of PoF is therefore dependent on sand (product) velocity. Table 4.3 shows operating years for a one-unit increase in PoF category for internal erosion. If sand is not present, the PoF is constant with time and it is equivalent to 1. PoF Assessment for External Impact Damage due to external impact may rise from any of the following:  dropped objects  anchor impacts  anchor dragging  Trawling etc. CHESS SUBSEA ENGINEERING – INNOVATIVE SOLUTIONS Subsea Systems Risk Based Inspection (RBI) Module 4 – Manifold System RBI Table 4.2: Years of Operating for a One-Unit Increase in PoF Category for External Corrosion PoF Assessment for Internal Erosion Fluid velocity is a very important parameter when considering erosion, because the erosion rate is proportional to the power of 2.5 to 3.0 for the velocity. Table 4.3: Operating Years for a One-Unit Increase in PoF Category for Internal Erosion Note: The defect characteristics of internal erosion can be similar to corrosion defects, and the same inspection categorization as for corrosion defects can be used. Again, the PoF increases with time due to potential growth of erosion defects. High velocities will result in a more rapid increase in the PoF, and the number of years for a one - unit increase of PoF is therefore dependent on sand (product) velocity. Table 4.3 shows operating years for a one-unit increase in PoF category for internal erosion. If sand is not present, the PoF is constant with time and it is equivalent to 1. PoF Assessment for External Impact Damage due to external impact may rise from any of the following:  dropped objects  anchor impacts  anchor dragging  Trawling etc.