BS 3441 : 1989 pdf download.Tanks for the transport of milk and liquid milk products.
1 Scope
This British Standard specifies requirements for the design,materials and construction of the tanks of tankers intended for the transport of milk and liquid milk products.
NOTE. The titles of the publications referred to in this British Standard are listed on the inside back cover.
2 Definitions
For the purposes of this British Standard, the following definitions apply.
2.1 tanker. A road or rail transport vehicle fitted with a tank or tanks designed for the storage and transport of milk and liquid milk products.
2.2 atmospheric tank. A tank for the storage and transport of milk or milk products which is designed to be filled and discharged only at atmospheric pressure.
NOTE. Atmospheric pressure during flling of tanks flled through the outlet pipe is maintained by provision of venting in the manway lid.
2.3 pressure discharge tank. A tank for the storage and transport of milk or milk products which is designed to be flled only at atmospheric pressure but may be discharged at a pressure greater than atmospheric.
2.4 vacuum flling/pressure discharge tank. A tank for the storage and transport of milk or milk products which is designed to be fillel under vacuum and discharged at a pressure greater than atmospheric.
3 Tank shell
3.1 Materials and thicknesses
The tank shell shall be constructed of stainless steel plate of either grade 304 S15 or grade 316S16of BS 1449 : Part 2.
NOTE 1. Guidance on the selection of materials of construction and welding consumables is given in appendix B. The minimum thickness of the tank shell shall be: (a) not less than those values specified in BS 5500 or table 1, whichever is thicker, in the case of pressure discharge and vacuum flling/ pressure discharge tanks; and
(b) not less than the values shown in table 1, in the case of atmospheric tanks.
NOTE 2. The thickness of the material for the construction of tanks depends upon design considerations such as the cross section of the tank in relation to its length, the type of tank mounting envisaged and the possible inclusion of baffles.
3.2 Shell plate arrangement
If the shell length is produced from more than one single plate, the longitudinal seams shall break joint at intermediate circumferential seams.
4.2 Marking
The following information shall be permanently marked on each tank, adjacent to the manufacturer s nameplate.
(a) Manufacturer's name and address.
(b) Manufacturer's tank serial number.
(c) The grade of stainless steel.
(d) Working pressure (and vacuum, where applicable).
(e) Test pressure (and vacuum, where applicable) and date.
(f) The number and year of this standard,i.e. BS 3441 : 1989*.
(g) Where CIP equipment is permanently mounted, the relevant pressure and flow rate for correct operation of the equipment.
(h) The nominal capacity and identification number of each tank.BS 3441 pdf download.