Transocean systems approved by Shell

Last year Transocean completed the first part of testing series according to the specifications of Shell Global. These specifications describe paint systems for the various areas on offshore installations as well as to which technical standards these paint systems should comply with in order to be approved.
Several test methods were used to simulate the harsh conditions of the maritime offshore environment.
These tests include for instance a cyclic corrosion test according to ISO 20340 for 4200 hours or 25 exposure cycles.

Such an exposure cycle takes one full week and includes:
a)    72 hrs exposure to UV and condensation with alternating periods of 4 hr exposure to UV at 60°C and 4hr exposure to condensation at 50°C.

b)    72 hrs of exposure to salt spray in accordance with ISO 9227.
c)    24 hrs of exposure to low temperature at -20°C.

A visual representation is given below:
iso 20340

After this test, paint systems should show no signs of rusting, cracking or blistering and pull-off adhesion values should be greater than 5 MPa.
Other test methods used are Cathodic disbondment, resistance to impact, resistance to heat and resistance to over application.
This  test, also called thick film cracking test, is a specific test designed by Shell to test the resistance of high solids paints to over application.  Although Shell sets standards for applicators and contractors, it wants to ensure that if over application does occur, the paint system is able to withstand to an increased level of internal stress.

The test implies the application of 3 times the nominal dry film thickness on T-bars which are then subjected to 74 cycles (148 days) as described below.

One cycle (2 days):
1 h        : heating up from +20˚C up to +60˚C
6 h        : exposure to +60˚C
1 h        : ambient cooling from +60˚C down to +20˚C
16 h      :conditioning at +20˚C
1 h        : cooling from +20˚C down to -20˚C
6 h        : exposure at -20˚C
1 h        : warming up from -20˚C down to +20˚C
16 h      : conditioning at+20˚C

Thereafter, paints should show no disbanding, cracking or other defects.

Transocean had submitted paint systems for four kinds of substrates; grit blasted steel, stainless steel, aluminium and galvanised steel. At this stage systems specified from the paints listed below passed the various test and were included in the Shell Global approvals. At the end of this year, more systems are expected to be approved.

Transpoxy Barrier FF             – High build DTM - Epoxy Coating for use on all metal substrates.
Transpoxy Barrier 2.18          – High Solids Epoxy coating with excellent water resistance properties.
Transpoxy Tankguard 4.61    – Heat Resistant Phenolic Epoxy coating.
Transpoxy Uniprimer             – Versatile universal epoxy primer for all metals.
Transpoxy Mioprimer             – Heat resistance epoxy primer/coating filled with micaceous iron oxide.
Transpoxy Glascote               – High solids epoxy coating containing glass flakes for superior corrosion resistance.
Transurethane Shield            – High solids Polyurethane Finish
Transozinc Silicate                 – Zinc silicate anticorrosive using zinc paste for superior and facile application.
Transotherm                          – Heat resisting coating upto 450 °C without the need for post-curing.
Transosil Aluminium HR        – Silicone based paint with heat resistance upto 600°C

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