If a test should have been carried out at 1,500 tonnes and was not carried out until 2,000 tonnes, the date of the next test will be calculated from the 1,500 tonnes.
Os dylid bod wedi cynnal prawf ar 1,500 tunnell ac na chafodd ei gynnal tan 2,000 tunnell, cyfrifir dyddiad y prawf nesaf o'r 1,500 tunnell.