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Tuesday, March 20, 2018


INTERTANKO has discussed in some detail with NAVION their new changes regarding Polypropylene mooring Ropes and Tails which are in accordance with the OCIMF Mooring Equipment Guidelines 3rd Edition.

We are able to confirm the following changes:-

NAVION will not accept Polypropylene rope tails that are composed of 100% Polypropylene - this is due to inherent problems with Polypropylene and its diminishing properties due to age, friction and U.V. and is in accordance with the OCIMF Mooring Equipment Guidelines, section, which states the following:-


"Polypropylene rope has approximately the same elasticity as Polyester rope, but is significantly weaker than either Polyester or Nylon. Polypropylene has a low melting point and tends to fuse under high friction. It also has poor cyclic loading characteristics. Lastly, prolonged exposure to the suns ultra violet rays can cause Polypropylene fibres to disintegrate due to degradation.

Polypropylene is lighter than water and can be used for floating messenger lines. Otherwise, the use of Polypropylene for moorings is not recommended.


NAVION will not accept mooring ropes that are composed of 100% Polypropylene.

NAVION have also stated that they cannot accept 100% Polypropylene rope tails that are U.V. protected.

However, NAVION are allowing a "grace period" for the replacement of such 100% Polyprop rope mooring lines and are asking owners to replace the 100% composition Polyprop rope lines (as and when they are ready for replacement due to age). The replacement must be an alternative that is acceptable to the OCIMF Mooring Equipment Guidelines. There will be no grace period with regard to 100% Polypropylene rope tails.

NAVION will, however, accept Polypropylene mooring Ropes and Tails that are mixed with other materials such as Polyester and/or Nylon, for example.

The warning to owners is to ensure that the certificates for their ropes actually do state the mixture of the other materials. We are aware that a few rope manufacturers are still simply stating Polypropylene on the rope certificate despite the fact that the tails/ropes are actually a mix of materials.

The OCIMF Mooring Equipment Guidelines contain a table on page 99 of the various different types of propriety ropes that are manufactured containing such different materials.

Note: when such lines are replaced it will have to be remembered that most majors do not accept ropes in one direction that have different diameters and composition. As you will be aware, ropes of different composition can have the same Breaking Strain but a different diameter. Therefore, as and when such polypropylene ropes are being replaced, remember not to mix the different diameter ropes in the same direction in order to maintain acceptability by other Majors.

For further information, please contact Howard Snaith