Hanovia Supplying UV Disinfection Equipment To One Of China’s Leading Bottled Water Producers

UV disinfection specialist Hanovia has recently won the contract to supply UV disinfection equipment to Nongfu Spring Co. Ltd., one of China’s leading producers of bottled water and beverages.

Nongfu Spring

(Photo caption: A Hanovia UV disinfection system, similar to the units being supplied to Nongfu Spring Co. Ltd. In China)

Presently in China virtually all bottled water is disinfected using ozone. However, concerns about ozonation by-products such as bromate mean that more and more producers are now looking for alternatives.

The World Health Organization (WHO) lists bromate as a carcinogenic substance and recommends its maximum limit in mineral water be set at 0.01mg/l. In July 2008 the Chinese General Administration of Quality Supervision, Inspection and Quarantine recommended in a revised draft national standard for drinking water and mineral water that a maximum limit for bromate in bottled water be in line the WHO guidelines.

“Around the world many bottled water companies already use our UV technology to disinfect their products safely, avoiding the problems associated with ozonation and other chemical disinfection methods,” comments John Ryan, Hanovia’s Managing Director. “We are therefore well placed to provide a leadership role in the reform of China’s bottled water industry, of which the Nongfu Spring contract is just the first example.”

UV can be used for primary water disinfection or as a back-up for other water purification methods such as carbon filtration, reverse osmosis or pasteurization. As UV has no residual effect, the best position for a treatment system is immediately prior to the point of use. This ensures incoming microbiological contaminants are destroyed and there is a minimal chance of post-treatment contamination.

UV disinfection systems are easy to install, with minimum disruption to the plant. They need very little maintenance, the only requirement being replacement of the UV lamps every 8000 hours, depending on use. This is a simple operation that takes only a few minutes and can be carried out by general maintenance staff.

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Mode Scrambler Option Eliminates High Power Laser Hot Spots

Fiberguide Industries’ new mode scrambler option for its line of high power laser delivery assemblies protects the fibre optic conduit by conducting heat away from the fibre end.  Incorporated into the proximal end of the laser assembly, the mode scrambler allows the laser beam a homogeneous exit.

Mode Scrambler

The assembly option employs a custom designed high-power SMA connector, which utilizes air gap technology to eliminate all energy absorbing materials at the fibre end. The cantilevered fibre end can accept very high power levels that would normally destroy traditional fibre termination.  A uniquely designed heat sink is thermally and mechanically connected to the assembly to effectively conduct generated heat away from fibre.

The mode scrambler option is offered on Fiberguide’s standard silica and hard clad fibres, in standard core diameters from 200 to 1500um with numerical apertures ranging from 0.12, 0.22 (standard), 0.26 and 0.39 (standard).  For high power levels, a high conductivity copper ferrule is used for the nose of the connector allowing for greater heat dissipation.  All systems are designed around customers’ exacting requirements and specifications.

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Rupture Discs For The Modern Engineer

In recent years, requirements for an efficient, flexible process plant have forced plant engineers to look beyond the simple rupture disc and consider pressure-relief systems that are compatible with wider business issues.  Traditionally, process plant was set up to run with a view to long-term stability.  Today, the challenge is to increase flexibility, and so as a company’s business needs change, so do its plant and processes: plants switch to different products, processing conditions are altered and different process operation steps are switched in and out of line.  All of this takes place while new standards, both health and safety and environmental, are introduced and enforced with increasing strictness.  This has driven disc manufacturers to improve disc designs and increase focus on a broader range of selection criteria than might have been previously considered.

Opti-Gard in holder

(Photo caption: Elfab’s Opti-Gard™ rupture disc in a holder)

The two main types of rupture discs are categorised as forward- or reverse-acting, depending on whether the pressure forces are acting on the concave (forward acting) or convex (reverse acting) faces.  The ratio of maximum (plant) operating pressure divided by the rated burst pressure is called the operating ratio of the rupture disc.  Discs have historically been forward-acting, typically having operating ratios of 80 to 85%, but as application demands have increased, manufacturers have started switching to reverse-acting designs, with operating ratios as high as 95%. This is because, during normal operation, a reverse-acting design is able to support pressures much closer to its rated burst pressure than a forward-acting design. This can be utilised by plant operators to increase the pressure of their process steps, which in turn could deliver an improved yield without the need to purchase a completely new reactor.

In 2003, a new series of ISO standards (ISO 4126 entitled ‘Safety Devices for Protection against Excessive Pressure’ parts 1 to 7) were introduced. The standards are recognised product standards which may be used to demonstrate compliance with the essential safety requirements of the Pressure Equipment Directive (PED) (97/23/EC).  Under the PED, rupture discs are classed as safety equipment and fall into Category IV, requiring a government-notified body to review areas such as design and quality systems.

Parts 2 and 6 are directly applicable to rupture discs and present methods for calculating discharge flow rates through the disc. This figure can then be compared with the required discharge rate evaluated in a risk assessment. The calculations are separated into simple and complex systems. The definition of a simple system is as follows:

1) Discharges directly to atmosphere
2) Upstream pipework less than 8 pipe diameters from vessel; downstream pipework less than 5 pipe diameters
3) Rupture disc has an open area at least 50% of pipe area
4) Nominal upstream & downstream pipework diameters are greater or equal to the rupture disc nominal diameter
5) Flow is single phase (solid, liquid or gas)

Calculating discharge-flow-rate capacity of a rupture disc in a simple system is a relatively straightforward process that, due to the definitions of a simple system, assumes that the rupture disc is the controlling restriction to discharge. In a complex system, an iterative process is required in which a full analysis of the discharge pipework is undertaken to determine the pressure drops and flow resistances through the discharge pipework system.

The coarse control of the burst pressure is typically the choice of thickness and material type used for the disc membrane. However, as disc membrane materials (‘foils’) do not come in an infinite range of thickness, there have been limits to the tolerance being achieved, especially for forward-acting discs. Developments in reverse-acting disc design aim to trigger a burst due to a collapse of shape, rather than reaching a limiting stress value of the foil.  Coupled with the introduction of computer-controlled production equipment, this has enabled rupture discs to be offered with a burst-pressure tolerance of ± 3%, a vast improvement on historical values of ± 10-15%.

This increased accuracy can be used to deliver commercial benefits in addition to the obvious performance benefits. When a rupture disc operates after an over-pressure event, eliminating the cause and replacing the disc quickly is of the utmost importance. The traditional approach to coping with these events is to purchase spare discs for each installation and retain them in stock in an ongoing basis. As commercial pressures on process plants increase, operating expenses must be cut at every opportunity and the cost of stock is becoming significant. Not only does stock tie up cash, it incurs as stock has to be stored, physically protected and managed. Releasing this cash by managing down the value of stock is becoming a useful technique to increase financial efficiency.

With tighter tolerance discs and the use of advanced manufacturing methods bringing significant reliable lead time reduction, it has been found that a typical facility can reduce the variety of spares by up to 65% while maintaining the service levels required of a modern operation.

Plant control systems and staff increasingly demand remote indication of a disc burst event – not least due to the size of modern processing plants! A non-invasive burst detection system, based on magnetic field-sensing, is also becoming standard; this is also ATEX approved for use in Zone 0 areas. This system replaces the older style of in-line membranes featuring wires/electrical circuits within the process pipe, and combats the reliability issues suffered by these traditional technologies. The latest improvement to this technology has seen the introduction of wireless communication to further improve efficiencies by reducing the need for expensive electrical wiring and thermal sensors located with the disc.

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Elfab Opens Technical Information Centre In Asia-Pacific

Elfab, the leading European manufacturer of rupture discs, has recently opened a Technical Information Centre in Singapore to support the Asia-Pacific market.

The Centre, which was set up in late 2008, is the central point for all enquiries and orders to be placed across Asia. The new office employs highly experienced sales personnel from the rupture disc industry and will make product enquiries and sales placement much easier for customers across this region.

The office’s general manager, Joseph Tan, said: “This will more significantly raise Elfab’s profile in the region. Customers we have spoken to are excited by Elfab’s expansion as its products offer significant benefits over existing suppliers’ ranges.”

Elfab already works with a number of blue chip organisations across this region within the oil and gas, chemical, pharmaceutical, and OEM markets. The company is aiming for increased growth this year within existing and new markets alike.

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Omnifit® Bottle Caps Cut The Cost Of Laboratory Safety

Bio-Chem Fluidics manufactures a range of Omnifit® bottle caps and accessories which prevent harmful chemicals and solvent vapours from escaping, ensuring a safe and dependable solvent delivery system in the laboratory.

T-Series bottle caps

Following an extensive re-engineering programme, the company has now reduced the cost of its T-Series bottle caps. Featuring a PTFE* inner portion, which offers a high level of chemical compatibility, T-Series caps have an anti-twist design which allows the inner body of the cap to spin freely. This prevents tubes being twisted when the cap is fitted or removed and eliminates the need to disconnect fluid lines before unscrewing the cap.

The caps are very easy to use and require no fittings – standard 1/8” laboratory tubing is simply pushed through Luer ports on the top of the cap. These ports allow connection of other tubing sizes and types with a range of Luer adaptors which are available separately. Optional integrated check-valves and filters are also available, enabling pressure to be equalized within the bottle as liquid is drawn out and preventing particulate contamination.

*PTFE – poly(tetrafluoroethene) or poly(tetrafluoroethylene) is an inert, synthetic fluoropolymer. Because of its non-reactive properties it is ideal for use in containers and tubing for reactive and corrosive chemicals.

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Volk H-R Wide Field Lens for Laser and Diagnostic Work

High resolution lens allows visualization of details approaching the ora serrata

Volk Optical, a world leader in aspheric optics, has released the H-R Wide Field Laser Lens, a new pan-retinal lens for diagnosis and laser treatment. Its high resolution imaging, coupled with an extremely wide field capability, provides detailed views for diagnostic and laser work.

HR Wide

(Photo Caption: The Volk H-R Wide Field Laser Lens delivers superior imaging for diagnostic needs and PRP laser treatment)

The H-R Wide Field’s deep field of view reveals details as far out as the ora serrata and most importantly, is distortion free across the entire viewing area. The combination of Volk’s patented double aspheric glass design with low dispersion glass ensures the highest resolution imaging across the entire viewing field.

This superior viewing power is contained in a low-profile, reduced-size housing to simplify manipulation of the lens within the orbit. The H-R Wide Field has been compared favourably to the popular discontinued Rodenstock Pan Fundus Laser lens, with an even wider field of view and better image quality.

The lens provides a 0.50x magnification, and a 2.0x laser spot magnification and is the best choice for widest field diagnosis and PRP laser treatment. While the H-R Wide Field is a contact lens, requiring the added step of a coupling solution to the examination, it ensures clear visualisation of retinal tears or lesions across the entire retinal surface.  No non-contact lens exam method is able to achieve this level of image clarity and detail.

For more information about Volk products, please visit www.volk.com, e-mail John Strobel at johns@volk.com or phone him on +1 440-942-6161. The company is currently looking for distributors in India and any interested parties are invited to contact John Strobel for more information.

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