Liquefied Petroleum Gas Sampling Procedures (eBook)

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Published Date

March 2010

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Liquefied Petroleum Gas Sampling Procedures (eBook)

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In the liquefied gas shipping industry, cargo sampling is a routine requirement of quality control and custody transfer procedures. The risks that are associated with taking samples should be minimal, provided that the correct procedures both on the ship and shore are followed by trained personnel who are familiar with this type of operation. If these requirements are not met, the possibility of there being an incident increases significantly. The most typical example is when shore representatives are required to take samples from the ship’s tanks.

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It has been established that the risk of an incident is much greater when personnel are attempting to draw samples from areas unfamiliar to them, particularly if they attempt to use mis-matched connections. The most common example of this situation is the requirement for shore representatives to draw samples from ship tanks.

In November 1988, SIGTTO addressed this problem and published International Recommendation to standardize liquefied gas sampling valves, connections and operations. SIGTTO recommended, inter alia, that ship’s tank sample connections should terminate in a G ½ female parallel threaded connector to ISO 228/1, and the sampling equipment should terminate in a corresponding male connector. This recommendation has been adopted widely by the industry in the meantime.

However, following two separate incidents on board gas carriers carrying out sampling operations within UK ports, the UK MAIB issued Recommendation No. 2007/149 urging SIGTTO to “Review and revise guidance provided to the industry on sampling arrangements, taking due account of any standard required by classification societies.”

The MAIB has published full details of both incidents. Which in summary, in the first case there was an uncontrolled release of VCM from the ship’s mast due to inadvertent cargo transfer from one tank to another during sampling. In the second case, an incorrectly installed sample valve unscrewed and dropped off when attempting to connect a sample container; the resulting leak could not be controlled as the ship’s ESD valve had jammed part-open due to an unrelated pre-existing problem that had not been observed.

The following updated recommendations have been produced by a working group consisting of a number of industry experts under the co-ordination of SIGTTO, with acknowledgement to the earlier publication (“Report of a working group on liquefied gas sampling procedures”).

The present document discusses the following aspects of sampling:

-Basic reasons why cargo samples are taken
-Sampling connections - “Open” and “Closed” loop systems
-Types of sample containers
-Recommended standard sample connections
-Safe procedures for taking samples

Taking Samples of Liquefied Gas Cargoes



1. The Basic Reasons why Cargo Samples are Taken

2. Sampling Systems – ‘Open Loop’ or ‘Closed Loop’ Systems

3. The Standard Type of Containers Used to Obtain and Transport Systems

4. Standard for Sampling Connection Fittings

5. The Procedures Involved in Taking Samples



The purpose of SIGTTO is to promote shipping and terminal operations for liquefied gases which are safe, environmentally responsible and reliable. To fulfil this mission it will:

  • Proactively develop best operating practices and guideline

  • Sustain a learning environment by sharing lessons learned

  • Promote training and development of all within the industry

  • Foster mutually beneficial relationships with regulatory authorities and other stakeholders

  • Conduct its business with professionalism and integrity

Title: Liquefied Petroleum Gas Sampling Procedures (eBook)
Edition: First
Number of Pages: 28
Product Code: WS1217EA
ISBN: ISBN 13: 978-1-905331-99-4 (9781905331994), ISBN 10: 1-905331-99-1 (1905331991)
Published Date: March 2010
Author: SIGTTO

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