Oil and Gas Sampling
DOEDIJNS
DOEDIJNS
Introduction
Scope of supply
Automatic sampling is an established method for providing a representative
Doedijns
sample of a pipeline transfer for the determination of bulk properties,
comprehensive range of sampling products and
especially water content, gravity and light ends for fiscal calculations,
systems.
scope
of
supply
now
covers
a
allocations and loss control. Products:
The main applications are for crude oils including HVP crudes, gas
• Pipeline mixing system.
condensates and associated liquids at production centres, export terminals
• Liquid and gas take- off probes, retractable
and refineries. Other applications include residual fuels, LPG and chemicals.
and fixed. • Direct in the line grab samplers.
Doedijns manufactures a range of automatic sampling equipment designed
• By-pass loop grab samplers.
originally with BP for sampling liquids in pipelines. This equipment is renowned
• High and low pressure sample vessels.
for its durability, proven by its decades of trouble free use on the North Sea
• Sample vessel mixing systems.
production platforms. Doedijns also has the capability to design and engineer
• Weighing systems.
complete sampling systems to meet the customer’s specific requirements
• Sample controllers.
and internationally accepted methods for accurate automatic sampling of hydrocarbon products. These methods are detailed in the standards:
Service and maintenance
ISO 3171, IP 6.2, API chapter 8.2 and Gost.
The service activities of Doedijns are supported worldwide. Working onsite, the service engineers
Systems:
of Doedijns ensure that technical challenges
• Inline sampling systems.
will be handled competently within the planed
• Fast-loop sampling systems.
schedule.
• Composite gas sampling systems. All service personnel have the relevant and required safety training to perform their tasks both on- and offshore.
Pipeline mixing
Sampling probes
The energy available during pipeline transfer maybe enough to disperse
Doedijns designs and manufactures a range of
and homogenise the product sufficiently to enable representative sampling.
standard retractable gas and liquid probes, fixed
However, extra mixing will often be required. Doedijns supplies mixing
probes, and multi-point profiling probes.
solutions such as static and power mixers to increase the mixing energy required for representative sampling. These mixers are selected to meet the
Features:
C1/C2 mixing requirements found in ISO 3171.
• Suitable for pipelines from 4” NB. • Pipeline pressures up to 149 bar (Class 900). • Retractable under full line pressure. • Variable positioning of probe inlet. • Optional choice of materials. • Vortex Shedding calculations are applied to all probes. • Designed to fully meet ISO 3171, API 8.2 standards.
fixed probe
static mixer retractable probe
DOEDIJNS
Receiver vessels The integrity of the sample during sampling operations is of the utmost importance. Portable receivers, when designed correctly, can provide the most reliable solution. Design of the receiver should take into account the medium to be sampled and the ability to easily mix the contents when connected to an external mixing system. Doedijns manufactures and supplies a range of low and high pressure receivers with various sizes typically from 0.5 to 20 litre.
Receiver mixing system Due to the lapse of time between taking a sample and the actual analysis, which maybe several hours, heavier components such as water can drop out and separate. It is therefore necessary that the contents of the receiver are sufficiently mixed in order to obtain a homogenous product before taking a sub sample for analysis. Doedijns manufactures mixing systems, either for permanent installation in sampling systems or as stand-alone units for use in laboratories.
1000 cc constant pressure cylinder
RMS 2O receiver mixing system
PSR 10 / 10 ltr receiving can
Liquid samplers 804 inline sampler
The 804 sampler extracts a fixed size sample of liquid directly from pipelines with diameters of 4 – 52 inches at pressures up to 149 bar. Manufactured in 100% stainless steel the sampler can be used on crude oils, 804m retractable sampler
NGL, LPG, and residual fuels and chemicals. Dual sealing gives extended operating life. Available with an integral retractor device to enable positive extraction and
810 cell sampler
insertion in a live line.
The 810 Cell sampler is designed to be
Important advantages:
mounted in a standard 1 inch by-pass loop, with
• Enhanced safety when inserting or extracting.
pressures up to 149 bar. Also manufactured
• No need for special extended nozzles.
in 100% stainless steel, this grab sampler has
• Accurate dynamic positioning of
excellent durability. Its dual sealing system
the probe head.
makes it the most reliable sampler available
• Retractor device is always available.
even for wet and dirty crude oils. Designed
• Wetted parts available in
for simple maintenance, the top-works can be
other materials.
removed whilst the cell body remains in the loop. Replacement of the top works takes place in a matter of minutes. All samplers meet the ISO and API requirements for automatic hydrocarbon sampling. Doedijns can supply electrical or hydraulic samplers for locations where instrument air is not available.
810 cell sam pler
DOEDIJNS
Sampling Systems
The systems are designed to meet international
With over 14 years experience of manufacturing sampling systems we are
standards such as: ISO, API, ASTM. The systems
able to supply custom built solutions to meet our client’s specific sampling
generally fall into two categories: In-line and
requirements.
Fast-loop.
When designing a system careful attention is given to a number of key areas, for example: ambient and process conditions, available space, piping class, hazardous area requirements, material traceability, testing, and documentation. We are also able to supply fully ATEX-certified systems.
Optional inline instruments BS&W / Density
Isolation valve 804 In Line Sampler
Return
Auto-change system
810 cell sampler Flow indicator Flow control valve
r e x i m c i t a t S
Auto-change system
Constant pressure cylinders
Pump Outlet
Pre-charge gas Fixed sample probe PSR 10/20 portable sample receiver cans Optional weighing system Flow
In-line sampling system
Flow
Fast-loop sampling system
In-line Sampling System
Fast-loop Sampling System
A cost effective method of extracting a representative sample directly from the
Where higher accuracy is required, such as in
pipeline is the In-line Sampling System. The system can be used for a broad
custedy transfer, then a fast-loop system is
range of refined and unrefined hydrocarbon products. Our model 804 sample
recommended. A representative sample is taken
probes have a range of lengths which are selected for a given pipeline diameter.
from the centre of the pipeline using our scooped
Extraction and insertion can be done manually or at full line pressure using our
take-off probe. The system is designed to maintain
extracting devices. The samples are typically collected in either atmospheric
isokenetic and homogenous flow throughout the
receivers or constant pressure cylinders. Both sampler and receiver vessels are
system. Our 810 bypass cell sampler extracts
housed in stainless steel or GRP enclosures with the following typical optional
a standard 1 cc sample and deposits this into
extras: insulation, heating, weighing system, automatic can-change system and
either atmospheric receivers or constant pressure
sample controllers.
cylinders. Some of the major advantages of this type of system apart from the higher accuracy are the ease of maintenance, reduced dead volume in the sample lines and the ability to accommodate other measuring devices such as water-cut (BS&W) monitors or densitometers. Housed in stainless steel or GRP enclosures, these systems may include many optional features as mentioned for the inline systems.
Gas Sampling Systems Doedijns also manufactures composite gas sampling
systems
in
accordance
customer’s specific requirements.
Fast-loop sampling system
with
the
Doedijns Hydraulics B.V. Member of Doedijns International
Doedijns Hydraulics B.V. Member of Doedijns International
| Coenecoop 103 - 105 | 2741 PH Waddinxveen | The Netherlands | P.O. Box 179 | 2740 AD Waddinx veen | The Netherlands | t. +31 [0] 182 30 28 88 | f. +31 [0] 182 30 27 77 |
[email protected] | w ww.doedijns.com
| Australieweg 10 | 9407 TE Assen | The Netherlands | t. +31 [0] 592 40 50 70 | f. +31 [0] 592 40 55 70 |
[email protected] | www.doedijns.com
Doedijns International B.V.
Doedijns Asia Sdn. Bhd. (701989-P) Member of Doedijns International
| Coenecoop 103 - 105 | 2741 PH Waddinxveen | The Netherlands | P.O. Box 179 | 2740 AD Waddinx veen | The Netherlands | t. +31 [0] 182 30 28 88 | f. +31 [0] 182 30 27 77 |
[email protected] | w ww.doedijns.com
| 11A Jalan PJS 7/19 | Taman Bandar Sunway | 46150 Petaling Jaya | Selangor D E | Malaysia | t. +60 [0]3 5631 6733 | f. +60 [0]3 5632 6733 |
[email protected] | www.doedijns.com
2 5 6 3 0 1 I D
