PSI - Issue 48

Mohammed Badr Alzeer et al. / Procedia Structural Integrity 48 (2023) 363–370 Mohammed Badr Alzeer/ Structural Integrity Procedia 00 (2019) 000 – 000

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gasoil, as well as gasoline. Products are transferred in separate batches, with 100 (m 3 ) of Kerosene separating the two batches. The pipeline is made of API 5L GR B and API 5L X48 in addition to a few sections installed in the recent twenty years made of API 5L X52. The grades of line pipe are made of seamless and electric resistance welded (ERW). The nominal wall thickness is mainly 9.52 (mm). The pipeline is completely coated with Bitumen and Polyethylene (P.E.). In addition to that, the line pipe is well cathodic-protected utilizing Magnesium anodes. Figure 1 shows the topography of the pipeline, the line elevation varies between 0.61 (m) above sea level and 554 (m) Above Sea Level. Table 1 figures out some general information about the line.

Figure 1. Topography and metallurgy of the line.

Table 1. Pipeline Operating Details

Parameter

Value

Length

116.9 Km

Diameter

24'' (609.6 mm) 0.375'' (9.525 mm)

Wall Thickness (WT)

Material grades Line Pipe type

API 5L GR B, API 5L X48 and API 5L X52 Seamless and Electric resistance welded (ERW)

Relative roughness External Coating Type

100 Micrometer

Bitumen, Sack Cloth and Polyethylene (P.E.).

Design Pressure

65 Bar 86%, SMYS 52 Bar 69%, SMYS

Assessment Pressure

Fluid Velocity

0.8 m/sec

Design Temperature

20 °C

Fluid density

0.85 g/cm 3

Liquid viscosity centistokes

3.52 centistokes

4. Discovered Damage: by 2008 MFL Inspection The inline inspection identified a total of 276,912 metal loss measurements. Of these, 265,604 were reported as internal corrosion, and the remaining 11,308 were classified as external corrosion features. The deepest internal feature identified by the inspection report has a depth of 80% wall thickness with a reported depth of 49% wall thickness.