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Survey Documentation 

Open Measurement

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Survey Documentation - Shore Inspection

- Shore Lines and Tanks

Prior to gauging, determine the nature and quantities of material in the shore lines up to the vessel's flange.

The nature of shore line contents is determined by sampling the contents.  When line contents are questionable or when the possibility of cargo contamination exists, line samples must be tested to verify compatibility with the cargo that will be loaded.  Alternatively, shore line contents should be loaded into one cargo compartment on the vessel, gauged and sampled.

Indicated in the inspection report which steps were taken to determine that the shore pipeline was full of liquid.  Record the total capacity of the lines from the vessel's flange to the shore tank on the Report of Shore Quantity.

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If the line is stated to be full, a line verification should be performed.  If the line is reported to be empty, a check of line drains should be made at available locations (preferably at the low points in the line).  If the line is partially full, then the slack volume should be determined by conducting a line displacement.

Shore lines should be walked, if practical, to determine whether all valves are in the proper open or closed positions are are sealed where possible.  If it proves impossible to witness valve settings or to seal valves, record (to the extent advised by the terminal), the status of valves in the loading system.  If this task cannot be accomplished, note the reason for non-verification and identify the tanks used in loading the vessel.  Record the findings in the inspection report and issue a letter of protest.

When non-dedicated loading lines are used, determine optimal loading sequences of products flowing through the lines in order to minimize the potential for contamination caused by line displacement.  This determination should include an agreement on how the lines will be displaced and/or how the different product interfaces will be handled.

Before loading, each product in the shore tanks must meet the quality specifications of all contractual agreements and governmental agencies for both load port and disport.  Sampling and laboratory analysis shall be used to ensure that quality specifications are met.

I addition to causing off-specification of petroleum products, contamination may result in an unsafe condition for terminal and/or the vessel.

If the shore line contains material that requires heat, then it should be noted in the inspection report whether the shore lines are insulated and if they are stem traced and the line temperature should be obtained whenever possible and recorded.

- Tank Gauges

Take opening gauges, temperatures, samples and water measurements of each tank to be used in the loading.  Obtain the reference height from the tank calibration tables before gauges and water cuts are taken.  Any difference between the observed reference height and the reference height shown on the tank calibration tables should be noted and investigated.  Ullage and innage measurements should be taken for purposes of comparison.  The results of the investigation will indicate which gauges should be used for volume determination.  The heavy nature of some products may require that an outage measurement be taken.  Products with densities heavier than water may need to be water cut on top of the product.

Any incrustation that forms on top of the product may produce inaccuracies in measurement.  If this condition exists, all parties should be notified and the condition should be documented in the inspection report.  If the tank has been in active service recently and if time permits, wait for the liquid level to reach equilibrium conditions.  If waiting is impossible, the inspection report should indicate how long the cargo remained in the tank before gauging.  Record the automatic gauges for the purposes of comparison.

All gauges should be recorded only after securing two identical measurements that have been read to the nearest 1/8 inch (0.01 foot or 3 mm).  In the case of tanks with floating roofs, gauging should be avoided while the roof is in the critical zone.  The placement of roof legs in high or low position and the critical zone should be noted in the inspection report.

Sections of text taken from API - MPMS Chapter 17 Marine Measurement

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