This clause was inserted as a time-saving device when design changes were introduced before the pipe stock was fabricated into spools. In which case, the contractor would agree to reissue the isometric, fabricate to the new design, and install at no extra expense other than the amount provided in the contract, provided the length of the pipe had not increased.None of the bidders objected to this clause, either at the job explanation meeting or at the clarification meetings that followed. The contract was lump sum with unit rates for extra work.