English to Spanish Tech/Engineering Ships, Sailing, Maritime fuel consumption

Es un contrato con especificaciones para la construcción de un buque. Copio el párrafo:
The fuel consumption of the main propulsion plant during the test bed trials shall not exceed ... gram per shaft KW per hour using oil having a lower calorific value of .................... kcalories per kg. In case the actual lower calorific value of the fuel used differs from the figures mentioned in this paragraph, the fuel consumption will be corrected accordingly.