BS ISO 11563 pdf download Crude petroleum and petroleum products — Bulk cargo transfer — Guidelines for achieving the fullness of pipelines
d) pigging of shore lines, see 4.6;
e) line press (line pack), see 4.7.
Procedures b), c), d) and e) do not require the presence of a vessel.
4.2 Agreed tolerance
Parties should agree on the differences in volumes or tank levels, determined at the commencement and completion of a line-fullness procedure, that will be acceptable. Such differences are referred to as the “agreed tolerance”.
NOTE 1 Agreed tolerances can be derived from consideration of the nominal precision of the measurement techniques employed. In addition, records of previous line-fullness operations at a particular terminal can provide details to assist arriving at the agreed tolerance.
NOTE 2 For the line-press procedure, a typical agreed tolerance would be a 3 mm difference in tank level.
4.3 Line displacement between vessel and shore
4.3.1 This procedure consists of measuring the amount of liquid pumped from a shore tank to a vessel (or from a vessel to a shore tank) through the pipeline system designated for cargo transfer, and comparing the total observed volume (TOV) delivered to the TOV received. In some cases, for instance where temperatures of liquid in lines and tanks differ considerably, comparison of volumes corrected from the observed, TOV, condition may be necessary. If free water (FW) can be ignored, comparison using the gross standard volume (GSV) is satisfactory. If free water is present, comparison by the total calculated volume (TCV), namely GSV + FW, should be used. The parties involved should agree prior to the displacement on the comparison procedure adopted.
4.3.2 The vessel should either be on even keel with no list, or a trim correction or wedge calculation should be applied.
4.3.3 All cargo quantities on board and the shore tank quantity should be determined prior to line displacement.
4.3.4 The number of vessel tanks used for the line displacement should be kept to a minimum and be selected to minimize changes in trim or list (preferably one centre tank).
4.3.5 Obtain the fullness condition of the vessel lines before and after the displacement operation.
4.3.6 Obtain the nominal capacity of the shore pipeline system.
4.3.7 Agree on the quantity to be displaced. The displacement should be stopped when the TOV of product is at least 1 20 % of the combined capacity of all designated vessel and shore transfer pipelines. Calculate a stop gauge for the designated vessel or shore tank(s) to meet the agreed volume.
4.3.8 Agree on the flow rate.
4.3.9 Ensure proper coordination between the vessel and the shore to enable, for example, correct valve settings.
4.3.10 Record metered volumes or measure liquid levels in the tank and, as necessary, temperature and free water in delivery and receiving tanks, to derive TOVs or GSVs or TCVs as required.
4.3.11 Transfer the volume required for displacement between the vessel and the shore.
4.3.12 Record metered volumes or redetermine liquid levels in the tank and, as necessary, temperature and free water in the delivery and receiving tanks to provide TOVs or GSVs or TCVs as required.