The total weight of materials on board the vessel that varies little from one voyage to another, including the weight of engine spares, spare propeller, spare anchor, spare tailshaft, stores, provisions, crew's effects, lubricating oil and fresh water. (A 20, 000 dwt bulk carrier may have a constant weight of 350 tonnes or more. ) It is routinely determined at the start of draught surveys. It is sometimes called the dead weight constant.
Surveys required by law, i. e. (for a UK ship) by Act of Parliament or regulations made under an Act. They generally lead to the issue or endorsement of a statutory certificate. Class surveys are not a statutory requirement, although class surveyors often carry out statutory surveys under the authority of a flag State.
He should follow the average adjuster's advice, which will normally be to obtain Average Bonds and Guarantees on all sound cargo being discharged after the general average act, and to accumulate evidence required for the adjustment. The adjuster will make an estimate of the total value of the loss or damage and advise the shipowner of the rate of contribution required from each party.