In case separate routing of the pipes of the two systems is not practicable with the current arrangement, or an “A” system pipe is forced to pass through a “B” system space (or vice-versa), alternative arrangement has to be studied and agreed with the Owner. If necessary, on a case by case basis, A-60 insulation and substantial thickness according to Par. 14.1.3 that will guarantee the survivability of the pipes after a fire casualty may be proposed subject to LR and Flag approval.