Document ID: chunk:federal_register_of_legislation:F2007C00494:body:0:p8
Version: federal_register_of_legislation:F2007C00494
Segment Type: other
Provision Reference: 
Character Range: 23074–26340

with or degrade the function of the assembly or any breaks, cracks, or separation of components:
13.4.2.1.                    longitudinal tension(N) = 9.81 x 'Towbar's' rated capacity(Kg); and
13.4.2.2.                    vertical load (N) = 0.5 x 9.81 x 'Towbar's' rated capacity (Kg).
13.4.3.                          'Towbar' safety chain attachments must be fixed to a part of the 'Towbar' which is permanently attached to the vehicle.
13.4.3.1.                    Means of permanent attachment include at least either welding or bolting.
14.                                      'DRAWBAR' REQUIREMENTS
14.1.                                The 'Drawbar' must be securely attached to a substantial portion of the trailer.
14.2.                                The 'Drawbar' including the connections between 'Drawbar' and trailer must withstand loads as per Clause 14.2.1 or 14.2.2 without incurring either any residual deformation that would interfere or degrade the function of the assembly or any breaks, cracks and separation of components.  Alternatively approval can be by calculation as per Clause 14.2.3.
14.2.1.                          'Drawbars' to withstand a dynamic endurance test for 2 million cycles:
14.2.1.1.                    'Drawbars' for 'Pig trailers' up to 3.5 tonnes 'ATM' and hinged 'Drawbars' for other trailers to withstand a horizontal oscillating force of ± 0.6 x 'Coupling' 'D-value' in the longitudinal direction concurrently for 2 million cycles, applied at the intended 'Coupling' centreline.  The frequency must not exceed 35 Hz, and must be chosen not to coincide with  any natural frequency of the system;
14.2.1.2.                    Rigid 'Drawbars' for 'Pig trailers' over 3.5 tonnes 'ATM', to withstand a minimum horizontal alternating force of (± 0.6 x 'Coupling' 'D-value') acting in the longitudinal axis of the 'Coupling' and a minimum vertical alternating force of (static vertical coupling load ± 0.6 x 'Coupling'
'V-value') in the vertical axis of the 'Coupling' applied through the 'Coupling' centre asynchronously for 2 million cycles.
Static vertical coupling load in kN = g x S
where:
g = acceleration due to gravity (assumed to be 9.81 m/sec2)
S = vertical load in tonnes ('ATM' - 'GTM')
The frequency of the longitudinal and vertical forces must differ by between 1 % and 3 % and not exceed 35 Hz, but must be chosen not to coincide with any natural frequency of the system.
14.2.2.                          'Drawbars' to withstand a static test:
14.2.2.1.                    For trailers other than 'Convertor Dollies' and up to 23.5 tonnes 'ATM' the following minimum static forces separately applied at the intended 'Coupling' centreline:
14.2.2.1.1.              longitudinal tension and compression(N) = 1.5 x 9.81 x 'ATM'(Kg); and
14.2.2.1.2.              transverse thrust (N)= 0.5  x 9.81 x 'ATM'(Kg); and
14.2.2.1.3.              except for hinged 'Drawbar' trailers vertical tension
and compression(N) = 0.5  x 9.81 x 'ATM'(Kg);
14.2.2.2.                    For 'Convertor Dollies' or trailers over 23.5 tonnes 'ATM', the following minimum static forces separately applied at the intended 'Coupling' centreline:
14.2.2.2.1.              longitudinal tension and compression = 350kN; and
14.2.2.2.2.