OVERVIEW


SUBSEA/FLOATING HOSE TEST


  

Perform Annual Inspections and hose testing include the following, but not limited to:

  • Marine Growth Removal, perform cleaning marine growth attached to the outer surface of hose at the time after a visual inspection using high pressure washing or manually using a hand soft scrub
  • Hose marine growth removal and visual inspection and performance of minor repairs on external surface of hoses, if any.
  • Bolt and nut tightness inspection at least allowance for 20% of bolts and nuts torque check on each flange, will include bolt &  nuts condition inspection; if found loose, all bolts on the flange to be tightened to the torque standard recommended by manufacturer and replace if found damage or missing.
  • Perform inspection for signs of hose leakage per section hose as well as inspection of hose leak detectors contained in the hose sections.
  • Perform inspection of the possible signs of mechanical damage, such as: kinking / wrinkles, bulging/puffy, cutting, or tearing on the hose.
  • Perform a visual inspection of floating unit conditions attached to the hose buoy (floatation unit) or the collar, including swivel on securing wire and the securing, check nipple hose and so on.




Hydrostatic Test (GMPHOM 2009).

  • Lay out the hose so that it is straight and level, on rollers that will allow free (Frictionless) movement of the hose when the test pressure is applied. 
  • Note: If hoses are laid on the ground, friction will reduce the hose’s temporary elongation and make comparison with the factory acceptance test invalid.
  • Install pressure recording equipment.
  • Blind the hose an fill it with water, ensuring that all air is vented from the bore.
  • Apply a pressure of 0.7 bar gauge and measure the overall length of the hose assembly. Designate this length as L1.
  • Increase the pressure from 0.7 bar gauge to 0.5 x RWP. Hold the pressure for 10 minutes while also inspecting the hose for leaks.
  • Reduce the pressure to zero.
  • Increase the pressure to the RWP. This in the factory test pressure and is the pressure at which hose length comparisons are made. Hold the pressure for 10 minutes while also inspecting the hose for leaks. Measure the overall length of the hose assembly. Designate this length as L2.
  • Increase the pressure to 1.5 x RWP. Hold the pressure for 5 minutes, while also inspecting the hose for leaks.
  • Reduce the pressure to zero.
  • After an interval of 15 minutes at zero pressure, apply a pressure of 0.7 bar gauge. Measure the overall length of the hose assembly. Designate this length as L3.
  • Reduce the pressure to zero.


Calculate the temporary elongation and permanent elongation of the hose using the following formula:


Acceptance criteria:

  • The calculated permanent elongation not exceed 0.7 %
  • The calculated permanent elongation not exceed 2.5 %
  • No evidence of sweating leakage
  • No unusual distortion or twist exceeding 1.5 degrees/m during the test

Vacuum Test (GMPHOM 2009)

Clear plastic windows should be attached to both ends of the hose while sandwiching a sealant, a soft rubber gasket, or a closed cell foam, so that the interior can inspected visually by shining a beam of light from one end to the other. One plate should be fixed for connection to a vacuum source. Each hose should be tested to minus 0.85 (-0.85) bar gauge for 10 minutes. The inside of the hose should be examined for any signs of collapsing, blistering or deformity, or the appearance of oil or water entered into the inside of the hose. The outside of the hose should not show any deformity ore blistering.

Collapse of the hose, failure of adhesion between layers within the body of the hose, and blisters / deformities will cause for rejection.


    EXPERIENCE :

    • Pertamina Hulu Energy WMO
    • ExxonMobile
    • PT Armada Gema Nusantara
    • Huskey CNOOC Madura Limited




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