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IP 570 REVISED TO IMPROVE H2S TESTING

20/11/2014

3 amendment to IP 570/14a

The globally adopted Energy Institute (EI) test method IP 570 has been updated online and in the 2015 IP Test Method Books. The revised method is now referenced as IP 570/14a following industry feedback and research at Stanhope-Seta.

IP 570 covers the testing of H2S content of fuel oils including marine residual fuels, distillates and blend stocks in the liquid phase. The method details two procedures (A & B) and the relevant apparatus.

The main changes cover three aspects;

1. FAME inclusion

Samples containing FAME were subjected to a number of tests at Stanhope-Seta and presented to the Energy Institute where it was established that FAME has no effect on the method performance. As a result the scope of IP 570/14a has been expanded, via Note 4, to allow samples containing FAME to be analysed.

2. New enhanced sample test vessel design

Following a detailed study and robustness trial a new test vessel has been approved for use in IP 570. The new test vessel simplifies sample introduction with enhanced connections to prevent incorrect orientation. Upgrading to the new system is achieved using an upgrade kit available from Stanhope-Seta (part number SA4022-0).

3. Verification of the instrument

Section 9.5 of IP 570/14a mandates a verification process for ‘validation of apparatus performance’. The revision mandates verification of the instrument using an H2S solution every three months or whenever maintenance (i.e. detector replacement) is carried out. With measurement down to sub-ppm levels it is essential the instrument is working correctly and the best way to achieve this is to run liquid samples with known H2S content.

Creating stable samples containing H2S has proved to be a difficult exercise in the past, however Stanhope-Seta has developed a unique solution that has been used successfully for the last 18 months as part of a proficiency test scheme (PTS). A research report published in 2013 is available from the Energy Institute under the heading ‘Development of Stabilised Liquid Phase Hydrogen Sulfide Verification Solutions’.

H2S IP 570 Proficiency Test Scheme (PTS) and stabilised verification solutions

The IP 570 PTS, run by SetaAnalytics, allows participants to measure the performance of their instrument and compare it to other participants. The scheme is run on a subscription basis with either monthly or quarterly options available.

The quarterly scheme enables laboratories to comply with the new verification requirements of IP 570/14a as well as requirements in ISO 17025 and most importantly the ISO 8217 marine fuel specification.

The IP 570 PTS provides a stabilised solution which releases a known amount of H2S when introduced to the test vessel. The amount of H2S released will depend upon each batch produced and is varied each month to ensure the instruments are working at a range of H2S detection levels. Three consecutive tests can be run with each monthly batch solution supplied.

Results are keyed into an online reporting package and an indication of performance for this safety critical measurement is shown. Non-compliance is immediately identified and support offered on remedial action.

The data is collated and at the end of each PTS cycle the customer is provided with a full set of statistics allowing an immediate evaluation of the performance of their instrument. At the end of each PTS year all customers that have participated will receive an annual report showing their performance throughout the 12 month period

Summary of the 2013/14 PTS

  • 43 laboratories participated across 26 countries.
  • 473 tests were performed on 12 sample batches
  • Successful distribution of stablised H2S verification samples globally
  • R2 of 0.97 when comparing reference values with participants mean
  • Z scores were below 2 for 93% of laboratories
  • Instruments and samples maintained satisfactory performance over a long period

For more information visit the IP 570 PTS web page

Copyright Stanhope–Seta Limited 2014