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Problems & solutions Valves & actuators Thousands of valves selected for LNG projects

Problem: The giant Queensland coal seam gas-to-LNG (Liquefied Natural Gas) projects in Australia required thou- sands of valve actuators, embracing electric, elec- tro-hydraulic, pneumatic and gas-over-oil tech- nologies. Solution: Rotork flow control products have been selected for various applications throughout the project. To date, the com- pany has received orders for over 5000 valve actuators. The three projects are devel- oping coal seam gas in Queensland’s Surat and Bowen Basins. Hundreds of kilometres of pipelines will link the natural gas production wells on the

Ongoing service

extraction process for coal seam water.

Queensland mainland with a LNG production plant under construction on Curtis Island. For the upstream mainland wellheads, HART-enabled Rotork CVA modulating electric actuators have been ordered for process valve control at an even- tual total of 2000 widely distrib- uted sites. In addition to the natural gas, CVA actuators will also control the flow on the

Nearly 1000 Rotork Skilmatic SI and EH range electro- hydraulic actuators have been ordered for control valves, shut- down valves, wellhead skids and metering skids, while the orders for electric actuators are completed with IQ actuators for various isolating valve automa- tion duties.

The remainder of the order includes fluid power actuators for the pipeline and LNG plants on Curtis Island, and the GO range gas-over-oil actuators, most of which are for the main- line pipeline shutdown valves. Rotork T: 01225 733200

Enter 207 Actuators automate desalination plant

Problem: Robust, weather-resis- tant actuators were required for an Indian desalination scheme. Solution: The Nemmeli plant in Chennai is the first desalination scheme in India to adopt electric actuators for plant automation. AUMA was selected to supply over 250 electric actuators due to the product quality, local support and long-standing expertise sup-

Problem: With increasing pressure to avoid Ofwat’s burdensome SIM (Service Incentive Mechanism) points, utilities are looking for ways in which to allow mains to remain in service at all times, even when essential work is carried out. Solution: IVL Flow Control’s new Flow Stop system does just this. It provides the means to remove failed assets, or introduce new assets within a charged high pressure main, while providing a temporary bypass. Cost-effective to introduce, reducing excavation and reinstatement expense, Flow Stop’s fast bypass for burst main- tenance situations is available in diame- ters from 2” to 48”, for use on metallic, AC and PE pipes. It is designed to be used on Manual & Hydraulic Stopper Head insertions, and offers flexibility due to IVL Flow Control’s wide diameter range of the rubber ring. For example, on an N.D. 4” Expanding Stopper, an N.D. minimum of 95mm and a maxi- mum N.D. of 120mm. Twelve, 24 and 40 bar systems are available. IVL Flow Control

Enter 210 8

A previous desalination installation for Auma

plying India’s water sector that it offered.

The actuators are integrated with fieldbus interfaces which comply with the Modbus protocol used by the desalination plant’s distributed control system. The incorporation of redundant line topology enhances security as back-up data transmission con- nectivity is provided for all actua- tors linked to the fieldbus system.

The 81,000 square metre Nemmeli plant, has capacity to treat 100 million litres of sea water per day. Reverse osmosis membranes convert sea water into potable water which is supplied to Southern Chennai. Auma

Enter 208

Problem: Devices used in corro- sive atmospheres, often experi- enced in chemical plants, pulp and paper mills, and near-shore and offshore oil and gas installa- tions, must offer the required external protection in order to operate reliably. Solution: Emerson Process Management’s Fisher Fieldvue DVC6200 digital valve controller family offers an all stainless steel housing that withstands difficult process environments. The hous- ing and sealed construction pre- vents corrosion damage to components.

All DVC6200 series instru- ments use a linkage-less, non- contact feedback design to detect valve position. This valve posi- tioning technology eliminates any travel feedback issues caused by corrosion, high cycle or high vibration applications.

A guide to selection

Problem: A valve in a brewery can be very different to one used in a pharma- ceutical application, and it is critical that the chemical resistance properties of the valve housing and the gasket materials are suited to the substances the valve is expected to control. Solution: To help with the selection process, Burkert has released a chemi- cal resistance chart and a selection guide for solenoid valves. Michael Hanning, product manager at

Burkert Fluid Control Systems, said: “In the case of a simple solenoid valve, many of the components...are all exposed to the media. Therefore, infor- mation on the chemical compounds, temperature and pressure are all neces- sary to make an informed material selection.” If the production process involves liq- uid food products, the plastics and elas- tomers used should also conform to the local food and hygiene regulations. In addition, if a cleaning cycle is required between production processes, data is required for this procedure. Mechanical loading, increased tem- peratures and chemical concentrations all have a bearing on the performance of individual components.

In terms of valve selection, in general, plunger-type direct acting valves are best suited to neutral and clean fluids while pivoted armature valves can be used with corrosive, contaminated or aggressive fluids. The range of options for sealing and separating membranes is extensive, each with pros and cons. See the selection guide at www.

Valve controller withstands corrosive conditions

In addition to external protec- tion, corrosion resistance is found within the stainless steel housing with the digital con- troller’s fully encapsulated printed wiring boards. Internal component protection is further enhanced by a separate, weather- tight field wiring terminal box that isolates the field wiring con- nection from other areas of the instrument.

The DVC6200 series is offered with CSA, IECEx, ATEX and FM hazardous area approvals. Emerson Process Management Enter 211

NOVEMBER 2013 Process & Control

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