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