10 Doedijns Controls Oil Gas Sampling

8/17/2019 10 Doedijns Controls Oil Gas Sampling

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DOEDIJNS

Oil and GasSampling


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Scope of supplyDoedijns scope of supply now covers a

comprehensive range of sampling products and

systems.

Products:

• Pipeline mixing system.

• Liquid and gas take-off probes, retractable

and fixed.

• Direct in the line grab samplers.

• By-pass loop grab samplers.

• High and low pressure sample vessels.

• Sample vessel mixing systems.

• Weighing systems.• Sample controllers.

Service and maintenanceThe service activities of Doedijns are supported

worldwide. Working onsite, the service engineers

of Doedijns ensure that technical challenges

will be handled competently within the planed

schedule.

All service personnel have the relevant and

required safety training to perform their tasks

both on- and offshore.

IntroductionAutomatic sampling is an established method for providing a representative

sample of a pipeline transfer for the determination of bulk properties,

especially water content, gravity and light ends for fiscal calculations,

allocations and loss control.

The main applications are for crude oils including HVP crudes, gas

condensates and associated liquids at production centres, export terminals

and refineries. Other applications include residual fuels, LPG and chemicals.

Doedijns manufactures a range of automatic sampling equipment designed

originally with BP for sampling liquids in pipelines. This equipment is renowned

for its durability, proven by its decades of trouble free use on the North Sea

production platforms. Doedijns also has the capability to design and engineercomplete sampling systems to meet the customer’s specific requirements

and internationally accepted methods for accurate automatic sampling

of hydrocarbon products. These methods are detailed in the standards:

ISO 3171, IP 6.2, API chapter 8.2 and Gost.

Systems:

• Inline sampling systems.

• Fast-loop sampling systems.

• Composite gas sampling systems.

DOEDIJNS


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Pipeline mixing The energy available during pipeline transfer maybe enough to disperse

and homogenise the product sufficiently to enable representative sampling.

However, extra mixing will often be required. Doedijns supplies mixing

solutions such as static and power mixers to increase the mixing energy

required for representative sampling. These mixers are selected to meet the

C1/C2 mixing requirements found in ISO 3171.

Sampling probesDoedijns designs and manufactures a range of

standard retractable gas and liquid probes, fixed

probes, and multi-point profiling probes.

Features:

• 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 8.2standards.

retractable probe

fixed probe

static mixer


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Receiver vesselsThe 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 systemDue 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 aresufficiently 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

DOEDIJNS


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Liquid samplers804 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,

NGL, LPG, and residual fuels and chemicals. Dual sealing gives extended

operating life.

Available with an integral retractor device to enable positive extraction and

insertion in a live line.

Important advantages:

• Enhanced safety when inserting or extracting.

• No need for special extended nozzles.• Accurate dynamic positioning of

the probe head.

• Retractor device is always available.

• Wetted parts available in

other materials.

810 cell sampler

The 810 Cell sampler is designed to be

mounted in a standard 1 inch by-pass loop, with

pressures up to 149 bar. Also manufactured

in 100% stainless steel, this grab sampler hasexcellent durability. Its dual sealing system

makes it the most reliable sampler available

even for wet and dirty crude oils. Designed

for simple maintenance, the top-works can be

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

804m retractable sampler


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Fast-loop sampling system

Optional inline instruments BS&W / Density

Flow

Pump

Outlet

Return

810 cell sampler

Flow indicator

Flow control valve

Fixed sample probe

PSR 10/20 portable sample receiver cans

Optional weighing system

Auto-change system

The systems are designed to meet international

standards such as: ISO, API, ASTM. The systems

generally fall into two categories: In-line and

Fast-loop.

Sampling SystemsWith over 14 years experience of manufacturing sampling systems we are

able to supply custom built solutions to meet our client’s specific sampling

requirements.

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.

In-line sampling system

Flow

S t a t i c m i x e r

Isolation valve

804 In Line Sampler

Auto-change system

Pre-charge gas

Constant

pressure

cylinders

DOEDIJNS


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In-line Sampling SystemA cost effective method of extracting a representative sample directly from the

pipeline is the In-line Sampling System. The system can be used for a broad

range of refined and unrefined hydrocarbon products. Our model 804 sample

probes have a range of lengths which are selected for a given pipeline diameter.

Extraction and insertion can be done manually or at full line pressure using our

extracting devices. The samples are typically collected in either atmospheric

receivers or constant pressure cylinders. Both sampler and receiver vessels are

housed in stainless steel or GRP enclosures with the following typical optional

extras: insulation, heating, weighing system, automatic can-change system and

sample controllers.

Fast-loop Sampling SystemWhere higher accuracy is required, such as in

custedy transfer, then a fast-loop system is

recommended. A representative sample is taken

from the centre of the pipeline using our scooped

take-off probe. The system is designed to maintain

isokenetic and homogenous flow throughout the

system. Our 810 bypass cell sampler extracts

a standard 1 cc sample and deposits this into

either atmospheric receivers or constant pressure

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 accommodateother 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 SystemsDoedijns also manufactures composite gas

sampling systems in accordance with the

customer’s specific requirements.

Fast-loop sampling system

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10 Doedijns Controls Oil Gas Sampling

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