HM 86. Guidelines for measurement of crude oil loaded at offshore installations

Document options


EI Technical Partners get free access to publications. You will need to Login or Register here

Dear customer,

Please note that the EI publishing department has moved to a new print supplier for 2021. The option to purchase Hard Copies of our publications has been suspended until the New Year, when we will be making select areas of the catalogue available again. Until then, we will continue to offer PDF versions of our books. Please email pubs@energyinst.org if you have any queries.

Kind regards,
EI Publications

  • Published: November 2020
  • REF/ISBN: 9781787252240
  • Edition: 1st
  • Status: Current

This document focuses on the loading of ships offshore (i.e. not alongside a berth). This type of operation has become much more common with the development of many floating production storage and offloading (FPSO), floating storage offloading (FSO), and floating storage unit (FSU) facilities.

Although general procedures and guidelines for measurement and sampling are available and should be referred to, there are particular issues which need to be considered concerning offshore loadings:

  • vessel motion (where tank measurements are used);
  • proving facilities (where meters are used);
  • free water measurement;
  • effects of sediment build-up in export tanks;
  • temperature measurement;
  • sampling;
  • transfer pipeline/hose clearance;
  • vapor breakout from oil which is not fully stabilised and can seriously affect meter
    performance, and
  • logistical difficulties in attendance of independent inspectors or other cargo
    supervision/measurement personnel.

Movements considered are:

  • offshore crude oil transfers (including FPSO, FSO, FSU) where meters are used, and
  • offshore crude oil transfers (including FPSO, FSO, FSU) where meters are not used.

Lightering and ship-to-ship (STS) operations are not covered in this document. However, some of the comments and recommendations noted here may apply to these operations.

This document does not address issues relating to ship handling, mooring arrangements, or the mechanical design aspects of the systems involved.

Members Benefits

Are you an EI Member? If yes, register/log in now to ensure you receive free access or discounts to EI publications.

If you are not a Member, why not join today and receive all of the benefits of EI Membership? EI Members are entitled to a 25% discount on most EI publications.