Fig. 13 shows the results of a dynamic simulation of one fullbore
tube rupture at location 2 (cf. Fig. 6) based on B.C. scenario I.
Note that the pressure surges to a peak value in less than 0.4 s from
the time the tube ruptures. The surge pressure reaches a maximum
value of approx. 1855 kPa-a in E-10 exchanger, 1725 kPa-a at the
Battery limit, and 1960 kPa-a in E-11 exchanger. The higher value of
surge pressure in E-11 exchanger and associated CW lines are due
to the stiff parallel line as compared to that of E-10. Furthermore,
the pressure inside E-10 exchanger appears to be smoother than
that inside E-11 exchanger. This is because E-11 exchanger is subjected
to thewater column oscillations in the DN150 line, with little
damping offered by its relatively small volume (approx. 0.86 m3),
and that there is no vapour in it to introduce damping like that in E-
10. Exchanger E-10 has much larger volume (10.39m3) and also has
vapour accumulating, both of which dampen any potential oscillations.
Note also that the surge pressure quickly decreases after the
initial surge which is primarily due to the different boundary
condition being a fixed pressure in this scenario. This is manifested
in Fig. 13c where the pressure at the exit battery limit will settle to
942 kPa-a, which the constant pressure B.C. assumed in the present
simulation.