K Controls "Knowledge"

K Controls 007-100 Valve Position Monitors specified for use in FPSO ballast tanks

K Controls has used its expertise in sub-sea ingress protection and hazardous area approvals to develop 007-100 Valve Position Monitors that will be used in a new floating, protection, storage and offloading vessel (FPSO). The FPSO will be used by a consortium of companies for the processing of hydrocarbons and for the storage of oil in the northern UK sector. A total of 147 pieces have been supplied for use on hydraulically actuated ball and butterfly valves. The valves will be used in the sea water ballast tanks that are used for vessel stabilisation.

The majority of the position monitors contain end of travel reed proximity switches and some provide a 4-20mA with HART® signal to monitor the position of modulating control valves or the opening and closing characteristics of critical isolating valves. Klearvision visual indicators were specified for certain applications. The 007-100 enclosures have been investment cast from a high-alloy austenitic stainless steel developed for use in seawater and other aggressive chloride-bearing media. They have been independently tested by SGS Baseefa to IP68, for submersion at a depth of 30 metres.  

When not submerged, the position monitors could be in an area where hazardous gasses are present. They are therefore ATEX and IECEx intrinsically safe certified II 2 G Ex ia IIC T6. All the units have been supplied with multi pin connectors and the associated cable sets that meet the exacting standards required for both subsea and shipboard use. Each cable set has been cut to a predefined length between 19 and 166 metres in order to facilitate installation. Mounting kits for the actuators were supplied in Super Duplex stainless steel.

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Sub-sea valve position monitors specified for use on wave energy devices

K Controls sub-sea valve position monitors have been specified for use Aquamarine Power’s Oyster wave energy device that captures energy in near shore waves and converts it into clean sustainable electricity. The valves will control the flow of the high pressure water that is generated by the movement of the wave flap and associated hydraulic pistons and then moved onshore, via a pipeline, to drive a conventional hydro-electric turbine. Low pressure pipes will transport the water back from the hydroelectric power station to the wave energy device.

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There are a number of important application requirements:

• The position monitors have to be capable of being installed and commissioned sub-sea.
• They must be rated for continuous submersion at 15 metres depth.
• The feedback limits must be adjustable sub-sea and in such a way that dive times are minimised.
• Subsea connectors must meet an existing standard.
• Status indication must be provided and be visible to a diver.
• Extended life and reliability is required.

K Controls has been able to meet these requirements using a unit rated for submersion to a depth of 130 metres that has been widely used in the oil industry.

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It meets all of the clients requirements and can be calibrated remotely using the HART® protocol without diver intervention.

The field proven sub-sea position monitor has been used on applications that include:

• Monitoring the position of hydraulically actuated valves that flood the jackets on the legs of oil rigs during satellite guided positioning.
• Monitoring the position of failsafe valves on conventional tanker buoy mooring systems.
• Monitoring the position of valves in the ballast tanks of semi-submersible oil rigs.

Wave energy devices are important because the central aim of UK Government energy policy is to establish a supply of energy that is diverse, sustainable, secure and competitively priced. Ocean waves represent our planet's last untapped natural renewable energy resource. The energy contained within waves has the potential to produce up to 80,000TWh of electricity per year - sufficient to meet global energy demand five times over. Wave energy is, by its nature, a clean energy resource.  Aside from the energy expended in manufacture and installation of wave energy devices, it produces no carbon emissions.  In the future, subsea pipelines will connect multiple wave energy devices to a single onshore plant creating wave farms of several hundred connected devices generating hundreds of megawatts of electricity. The devices sit largely underwater so there is minimal visual impact.

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There is also a link between wave energy and desalination - the process of removing salt from water to produce freshwater.  Energy fuelled by diesel generators is currently used to pump high pressure saltwater over special membranes to produce freshwater. A wave energy device offers a cleaner, more cost-effective solution. It could be configured to produce high pressure saltwater direct to a desalination plant, without the need for any fossil fuels.

Pneumatic Valve Actuators in Sub-Arctic Climates

Once you have selected an actuator for use in sub-arctic climates it is worth remembering that K Controls manufactures complementary Position Monitors in coated aluminium or stainless steel. There are standard and Exd versions for use down to -60 degrees C and Exi versions for use down to -50 degrees C. 

K Controls now manufactures explosion proof valve position monitors for use in Canada and the USA

The 007-120 can be used as a valve limit switch box or a valve position transmitter and it now carries explosion proof cCSAus certification marking for use in Canada and the USA. 

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For Canada the product is gas certified Ex d IIC T6 and dust certified Class 2, Division 1, Groups E, F and G.

For the USA  the product is gas certified Class I Zone 1, AEx d IIC T6 and dust certified Class II, Zone 21, AEx tD T85^oC; IP67.

Designed for use in the oil, gas and petrochemical industries these units can be fitted to a wide range of quarter turn or linear valve actuators.

Avaialbe in stainless steel or coated alumium there is a very extensive range of monitoring equipment that can be fitted in the 007-120.

Switch options include micro switches, hermetically sealed magnetically operated reed switches and standard or failsafe inductive proximity sensors. Potentiometers of various different values can be geared or directly driven. A solenoid back wiring facility can be provided so that switches and solenoid can be wired to the control room via a single multicore cable without the requirement for a separate junction box.

For continuous feedback of valve position or for monitoring the performance of critical emergency shutdown valves during partial stroke testing, 4- 20mA, 4-20mA + HART®, PROFIBUS® PA or FOUNDATION™ FIELDBUS position transmitters are available in K4-20 variants. 

Spotlight on K Controls 007-100 and 007-120 Exd Position Monitors

The 007-100 and 007-120 Exd IIC Position Monitors  are ATEX and IECEx certified for use in gas Zones 1 and 2 and dust Zones 21 and 22.

The CE marked, IP67 enclosures are supplied in either coated aluminium or ANC 4B (316) stainless steel. Metric and NPT cable entries up to M25 and ¾” are available. The products have been designed to accommodate, as an option, the latest version of the top mounted highly visible Klearvision position indicator that can be used in IIC hazardous areas.

The 007-120 now carries cCSAus certification marking for use in Canada and the USA. (cCSAus certification of the 007-100 will follow during 2012). 

To learn more please download the following file:

Download K Controls Spotlight on the 007-100 and 007-120 Exd Position Monitors 2011 V 1.0