4.4.1 The service notations related to self-propelled ships intended for the carriage of liquid cargo in bulk are listed in [4.4.2] to [4.4.7].

4.4.2 Oil tanker, for sea going self-propelled ships
which are constructed generally with integral tanks and intended primarily
to carry in bulk crude oil, other oil products, or oil-like substances
having any flash point, or liquid at atmospheric pressure and ambient
temperature (or thus maintained by heating). This notation may be
assigned to tankers of both single and double hull construction,
as well as tankers with alternative structural arrangements, e.g. mid-deck
designs.
The service notation may be completed by the following additional
service feature, as applicable:
The additional requirements of Part D, Chapter 7 are applicable to these ships.
For ships with integral cargo tanks, the service notation oil tanker is
always completed by the additional service feature ESP (i.e. oil
tanker ESP), which means that these ships are submitted to
the Enhanced Survey Program as laid down in Ch 4, Sec 3.
4.4.3 Chemical tanker, for sea going self-propelled
ships which are constructed generally with integral tanks and intended
primarily to carry chemicals in bulk. This notation may be assigned
to tankers of both single or double hull construction, as well as
tankers with alternative structural arrangements. Typical midship
sections are illustrated in Fig 5, or a midship section deemed equivalent
by the Society. The additional requirements of Part D, Chapter
8 are applicable to these ships.
The list of products the ship is allowed to carry is attached to
the Certificate of Classification or the Certificate of Fitness,
where issued by the Society, including, where necessary, the maximum
allowable specific gravity and/or temperature.
For ships with integral cargo tanks, the service notation chemical
tanker is always completed by the additional service feature ESP (i.e. chemical
tanker ESP), which means that these ships are submitted to
the Enhanced Survey Programme as laid down in Ch 4, Sec 4.
4.4.4 Liquefied gas carrier, for ships specially
intended to carry liquefied gases or other substances listed in Pt D, Ch 9, Sec
1 of the Rules. The additional requirements of Part D, Chapter
9 are applicable to these ships.
The list of products the ship is allowed to carry is attached to
the Certificate of Classification or the Certificate of Fitness,
where issued by the Society, including, where necessary, the conditions
of transportation (pressure, temperature, filling limits).
The service notation may be completed by the following additional
service feature, as applicable:
4.4.5 FLS tanker, for ships specially intended to
carry in bulk flammable liquid products other than those covered
by the service notations oil tanker, chemical tanker or liquefied
gas carrier.
The list of products the ship is allowed to carry may be attached
to the Certificate of Classification, including, where necessary,
the maximum allowable specific gravity and/or temperature.
The service notation may be completed by the additional service
feature flash point > 60°C,
where the ship is intended to carry only such type of products,
under certain conditions.
For ships intended to carry only one type of cargo, the service
notation may be completed by the additional service feature indicating
the type of product carried, e.g. FLS tanker-edible oil.
The additional requirements of Part D, Chapter 7 are applicable to these ships.

4.4.6 Tanker, for ships intended to carry non-flammable liquid
cargoes in bulk other than those covered by the service notations
in [4.4.2] to [4.4.5],
such as water.
The list of cargoes the ship is allowed to carry may be attached
to the Certificate of Classification.
For ships intended to carry only one type of cargo, the service
notation may be completed by the additional service feature indicating
the type of product carried, e.g. tanker-water.
The additional requirements of Part D, Chapter 10 are applicable to these ships.
4.4.7 Refer also to [4.3.4] and [4.3.5] for combination carrier intended to carry alternatively oil products and dry cargo in bulk in cargo holds/tanks.