MEASUREMENT SYSTEMS
JISKOOT™ QUALITY SYSTEMS
DATA SHEET S059-1105-6
Laboratory Workstation
LabPC & Mixer
Introduction
International sampling standards ISO 3171, API 8.2
and IP 6.2 define four steps that must be undertaken
to assure fiscal quality sampling accuracy. Two of
these key steps involve the collected sample in a
receiver and are performed in the laboratory:
“Sample handling and mixing” and “Laboratory
analysis”. The laboratory workstation comprising the
laboratory mixer and LabPC, is designed to
standardise and record the sample handling and
mixing process through the withdrawal of samples
from the receivers for analysis. Use of this equipment
provides quality assured accountability that is beyond
dispute. LabPC
The LabPC is a Windows based workstation that
provides a database of mixing information and
MS-53 Laboratory mixer integrates both manual and instrument inputs to
The mixer is designed to process Jiskoot model PR23 permit the generation of mixing cycle reports. These
and PR53 sample receivers but is also compatible reports are stored locally and can be uploaded
with other designs. The role of the mixer is to mix through a data link to a plant wide movement
the sample in the receiver prior to laboratory analysis; system, to allow integration to bills of loading and
the period of time between the sample being receipt. Further management information can be
collected into the receiver and the analysis of that derived as the LabPC logs times against the receipt,
sample can result in the heavier components storage and upload of reports. The LabPC can be
separating. Therefore to ensure the sample enhanced with a barcode printer and reader, so that
withdrawn from the receiver is representative the receiver labels can be issued for duty and on return,
contents must be thoroughly mixed. The MS-53 can immediately be tied into the operation. This
provides an electrically or pneumatically driven overcomes the requirement for manual logging of
pumped loop to perform this vital function. samples.
MEASUREMENT SYSTEMS
Description of operation After the suggested mixing time has elapsed the PC
Mixing times for samples are both crude type and will bleep continuously and flash a lamp mounted on
sample volume specific, the time to mix 5 litres of a the skid to indicate that water, density and other
low viscosity crude is substantially different for 15 litres required samples should be withdrawn via a septum, or
of a high viscosity crude, it is necessary to mix for the through a valve should larger volumes be required. A
minimum time required for homogenisation. Too short density sample is directly piped to a densitometer
and the water content is undermeasured, too long and which is cooled and measured. When all the samples
the temperature will rise and light ends will be lost have been withdrawn the operator performs a purging
resulting in higher density readings. and flushing cycle (using solvent and inert gas), stops
the pump and allows the mixer to drain.
Mixing times are established historically so that they
may be interpolated for new samples. Sample mixing The density is read directly by the LabPC and if
proving tests may also be recorded. available the Karl Fisher titration result may also be
directly input. Temperature and pressure are directly
The sequence of operation is as follows: logged throughout the cycle to verify that the sample
The receiver containing a sample is brought to the was mixed correctly and not overheated.
laboratory, the crude type and batch or tank identifier Sample receiver cleaning
is keyed in and the receiver placed on the mixer. The
unit weighs the receiver and the sample weight is After the mixing cycle the cans must be fully cleaned
recorded. The LabPC uses the sample weight and crude and dried, this can be performed using a solvent or
type to suggest a suitable mixing time. water based cleaning system available from Jiskoot.
Any residue is drained from the receiver. It is inverted
The operator starts the motor on the mixer and the and coupled to the cleaner which is ducted to ensure
cycle commences. The LabPC records the starting time that hazardous vapours are not released. The cleaner
and after a short settling period records the mixer goes through a three stage cycle - in the first stage a
temperature and pressure which are logged through solvent or detergent water mix is recycled, in the second
the cycle. stage the receiver is flushed and finally it is air dried.
S059-1105-6 © Copyright 2011 Cameron International Corp. All Rights Reserved.
