known if the autosampler is owned and/or operated by SGS. Custody transfer or Outturn volume (TOV calculated) PVco : Total batch parcel volume, as measured by the custody transfer system, at observed temperature and pressure. The total includes products, water and sediment. (GV for meters and TOV for tanks). Basically, this is the observed volume delivered (load) or the observed volume received (discharge). The Grab Linearity Factor (GLF) which is not mandatory and not always monitored/recorded; however, in instances where the Grab Linearity Factor is calculated the following data is used: 1. Density / API: This is the density expressed in kg/l (if m3 are selected as the Transfer Volume Unit) or API (if Bbl is chosen as the Transfer Volume Unit) of the cargo. 2. Sample line volume: The sample line volume between the sample extractor and the sample container, expressed as SVf in the standard. This is not to be confused with the shoreline volume. This is the volume of the line / tubing used to transfer the extracted sample to the primary sample container. This volume is to be expressed in ml and only if the line volume is displaced to the sample receptacle on completion of the operation. 3. Number of entries: The number of individual consecutive single interval volumes (GLFn)
could not be achieved when an automatic sampling system is used to sample a relatively small parcel. Total Number of grabs recorded (N): The total number of grabs recorded by the sample controller. This number is not to be calculated and normally this data is available from the automatic sampling system. This information should be sourced from the terminal or will be known if the autosampler is owned and / or operated by SGS. Sample volume collected (SV): The actual volume collected in the primary sample container at observed temperature. This volume must be either physically measured or derived from the weight of the oil and tested density. It is not to be either estimated or calculated by any other means. Measurement is typically performed by weighing the sample container prior to and after delivery and then converting the weight difference to volume using the tested density, or by other means of determining volume, for example a volume determined by visually confirming the level of liquid in a sample container that has been calibrated via a graduated sight glass. This volume must be verified by an SGS staff member. In scenarios where SV cannot be confirmed i.e. measured, we CANNOT state that an AILS operation has passed; however, the absence of SV does not always mean that the automatic sampler system operation failed, only that there is a lack of data to confirm that it passed. Parcel Volume measured by the flow Sensing device (PVs): The volume as measured by the automatic sampling system. This information should be sourced from the terminal or will be
transfer operation, this will be the quantity that is expected to be delivered. On a discharge operation, this will be the vessel figure before commencement of transfer. Expected maximum flow rate during the batch: (Max Flow Rate): The maximum achievable flow rate. This information can be sourced from the vessel and/or terminal. The maximum flow rate will be dictated by specific terminal configuration and/or vessel involved with the transfer. Extractor grab size (b): The size of the extractor used to obtain each individual grab. This information should be sourced from the terminal or will be known if the autosampler is owned and/or operated by SGS. Maximum grab frequency (Max Sample Cycle): The limitation of the autosampler equipment being used i.e. the maximum number of grabs that can be taken in one minute. In scenarios when this information is not available, a reasonable estimate will suffice. Maximum capacity of sample container used (SV 100%): The maximum volume of the sample container used to receive the extracted sample. Minimum sample volume required for testing / acceptance criteria (SV min): The greater of: 1) The lowest volume which passed operator acceptance testing for sample container mixing system, if a Low Volume (LV) was tested or 2) The minimum sample volume required for testing, retains, and error margin when choosing the LV test point for SV min. Typically, SV min is substantially exceeded, though it is conceivable that SV min
68
Made with FlippingBook Annual report maker