The requirements of 22.214.171.124 shall apply to the marking of FRP tanks, with the following amendments:
- the tank plate may also be laminated to the shell or be made of suitable plastics materials;
- the design temperature range shall always be marked.
In addition, when they are shown under an entry in Column (13) of Table A of Chapter 3.2, the special
provisions of 6.8.4 (e) (TM) shall also apply.
REQUIREMENTS FOR THE CONSTRUCTION, EQUIPMENT, TYPE APPROVAL, INSPECTION AND MARKING OF VACUUM-OPERATED WASTE TANKS
NOTE 1: For portable tanks and UN multiple-element gas containers (MEGCs) see Chapter 6.7; for fixed
tanks (tank-vehicles), demountable tanks and tank containers and tank swap bodies, with shells made
of metallic materials, and battery-vehicles and multiple element gas containers (MEGCs) other than
UN MEGCs see Chapter 6.8; for fibre-reinforced plastic tanks see Chapter 6.9.
NOTE 2: This Chapter applies to fixed tanks, demountable tanks, tank-containers and tank swap bodies.
NOTE: A tank which fully complies with the requirements of Chapter 6.8 is not considered to be a
"vacuum-operated waste tank".
The term "protected area" means the areas located as follows:
(a) The lower part of the tank in a zone which extends over a 60o angle on either side of the lower
(b) The top part of the tank in a zone which extends over a 30° angle on either side of the top
(c) On the end front of the tank on motor vehicles;
(d) On the rear end of the tank inside the protection volume formed by the device stipulated in
The special requirements of 6.10.2 to 6.10.4 complete or modify Chapter 6.8 and are applied to
vacuum-operated waste tanks.
Vacuum-operated waste tanks may be equipped with openable ends, if the requirements of Chapter
4.3 allow bottom discharge of the substances to be carried (indicated by letters "A" or "B" in Part 3 of
the tank code given in Column (12) of Table A of Chapter 3.2, in accordance with 126.96.36.199.1).
Vacuum-operated waste tanks shall comply with all requirements of Chapter 6.8, with the exception
of requirements overtaken by a special provision in this Chapter. However the requirements of
188.8.131.52.19, 184.108.40.206.20, and 220.127.116.11.21 shall not apply.
Tanks shall be designed for a calculation pressure equal to 1.3 times the filling or discharge pressure
but not less than 400 kPa (4 bar) (gauge pressure). For the carriage of substances for which a higher
calculation pressure of the tank is specified in Chapter 6.8, this higher pressure shall apply.
Tanks shall be designed to withstand a negative internal pressure of 100 kPa (1 bar).
Items of equipment
The items of equipment shall be so arranged as to be protected against the risk of being wrenched off
or damaged during carriage or handling. This requirement can be fulfilled by placing the items of
equipment in a so called "protected area" (see 18.104.22.168.1).
The bottom discharge of shells may be constituted by external piping with a stop-valve fitted as close
to the shell as practicable and a second closure which may be a blank flange or other equivalent
The position and closing direction of the stop-valve(s) connected to the shell, or to any compartment
in the case of compartmented shells, shall be unambiguous, and be able to be checked from the