# The Road Vehicles (Authorisation of Special Types) (General) Order 2003, Paragraph 7

Extent: E+W+S

(1) Every pipeline must be fixed in such a manner and position that—
(a) it will not be adversely affected by the heat of the exhaust system of any engine or by any other source of heat;
(b) it is protected from vibration and strain in excess of that which it can reasonably be expected to withstand;
(c) it is so placed or shielded as to minimise the risk from flying debris; and
(d) in the case of a medium or high pressure pipeline it is, so far as is practicable, accessible for inspection.
(2) Except as stated in sub-paragraph (4), every medium or high pressure pipeline must be—
(a) a rigid line of seamless steel of high pressure hydraulic grade, suitable for service on road vehicles and designed for the full range of operating temperatures, pressures and loading which may occur; and
(b) effectively protected against, or shielded from, or treated so as to be resistant to, external corrosion throughout its length unless it is made from material which is corrosion resistant under the conditions which it is likely to encounter in service.
(3) No unsupported length of any medium or high pressure pipeline may exceed 600mm.
(4) Flexible hose may be used in a medium or high pressure pipeline if—
(a) it is reinforced either by stainless steel wire braid or by textile braid; and
(b) except in the case of a pipeline attached to a gas container for the purpose of filling that gas container, the flexibility which it provides is necessary for the construction or operation of the gas propulsion system of which it forms a part.

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Source: https://www.legislation.gov.uk/uksi/2003/1998/schedule/12/paragraph/7 (the official version)
Page: https://openlegislation.uk/road-vehicles-authorisation-of-special-types-general-order-2003/schedule-12/paragraph-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.