Pumping clause. In a tanker charterparty the description of the vessel will contain a clause specifying the capability of the vessel to pump the cargo for which the vessel is chartered.

Port risks policy. This covers a vessel against the risks in port only. (In modem hull policies, port risks are included.)

Queen's enemies. ("King's enemies".) In the carriage of goods by sea, under the English common law the "common carrier" is subject to very strict liability for loss or damage of the goods.

P. & I. bunkering clause. The ship is allowed to deviate without breaching the charter in order to lift bunker fuel at places where it may be cheap.

Pratique. This is permission from the port health authorities for a ship to come into and to use a port.

Running down or 3/4ths collision liability clause (RDC). Under the Institute Time Clauses (Hulls) 1983 it is agreed that if the insured vessel is to blame for a collision with another vessel, underwriters undertake to pay three-fourths of the damage sustained by the other vessel up to a maximum of three fourths of the value of the insured vessel mentioned in the policy.

Port charter. A voyage charter is a contract to carry goods from a loading port or a range of ports to an agreed destination.

Partly cellular container vessel. These are vessels which are designed to carry part of the full cargo in fixed cell guides.

Rider clauses. Standard form charterparties have been used for a very long time and their use is recommended by shipowners' P. & I. Associations because they contain clauses that have generally been tested in courts when disputes have arisen.

Principles of marine insurance. Section 1 of the U:K. Marine Insurance Act 1906 states:

Penalty clause. A possible Penalty clause in a voyage charterparty for non fulfilment of the contract can state:

Reversible laytime.  "Reversible" means an option given to the charterer to add together the time allowed for loading and discharging. Until this total time expires, no demurrage becomes payable. When the option is exercised the effect is the same as if a total time was specified to cover both operations.

Panama Canal tonnage. This is tonnage measured according to rules published by the United States Government from 1912 under authority delegated by the Panama Canal Company. The main purpose of the special measurement system is to establish criteria, which determine the owner’s liability to pay fees for Panama Canal transits.

Protest.  A letter of protest or note of protest may be given by the master to various parties such as shippers, charterers, or stevedores, who engage in activities which are unacceptable to the master.

Rotation number. This is given to a ship by port authorities, especially by Customs authorities, to indicate the ship's turn to berth for loading and/or discharging. It is based on the ship's arrival and reporting by the master or agent to the port authorities. In chartering, the term would then be related to the clearance of the ship and whether the ship can give a Notice of Readiness.