Power GenerationProviding cost effective instrumentation solutions

Product FocusMulti Stage Restriction Orifice Plates

Rototherm OnlineAll change on the web

Application FocusSentinel Dairy pasteuriser product application

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in focusBritish Rototherm News Update | Q4/2011

in focus

Restriction orifice plates have traditionally been used to reduce

pressures in GAS AND LIQUID FLOWS by forcing the flow through a

restricted bore. The precise pressure drop is produced by accurately

calculating the orifice bore, having taken into account all the rel-

evant process and flow conditions.

Applications

• Gas and Liquid Flows

• High Pressure Drops

Prevents

• Cavitation and Flashing in Liquid flows

• Choked flow in gases.

• Excessive Noise / Vibration

Where very HIGH PRESSURE DROPS in liquid flows are required

MULTISTAGE RESTRICTION ORIFICE ASSEMBLIES may be required to

achieve the desired pressure drop whilst preventing problems such

as CAVITATION, FLASHING and high NOISE and VIBRATION levels.

CAVITATION is a potentially damaging, erosive condition which

occurs when the internal pressure of the liquid passing through the

orifice falls below its vapour pressure and vapour bubbles form.

Further downstream from the orifice the pressure recovers suf-

ficiently to collapse the bubbles with extreme violence. Cavitation

calculations are performed during the design stage of a Multistage

RO to calculate cavitation factors at each stage in the orifice

assembly.

Multi-Stage RestrictionOrifice Plates

Product Focus

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Product FocusMulti Stage Restriction Orifice Plates 2

Application FocusElite SafeGauge - Aircraft Tyre Pressure Gauge 4

Rototherm Online - all change on the web 5

Application FocusSentinel: Dairy pasteuriser product application 6

Industry FocusRototherm - your partner in Power 7

Over seventy five years of manufacturing experience 8

Rototherm Worldwide 8

Contact Us 8

Cont

ents

InteractiveClick this icon button to link direct to the relevant product on the Rototherm website.

Click this icon button to visit Rototherm’s online shop where the product is available to purchase

in focus

FLASHING is a similar phenomenon to cavitation except that the process pressure never recovers sufficiently to collapse the gas bubbles resulting in two phase flow - liquid and gas - downstream of the orifice. Erosion of pipe work and valves and other instrumentation can occur due to the impact of liquid droplets carried at high speed in the vapour flow.

CHOKED FLOW IN GASES – also know as critical flow – occurs when too large a pressure drop is attempted across a single ori-fice plate. When the downstream pressure is less than 52.8% of the upstream pressure, the flow through the orifice will become sonic, at which point no further increase in flow can

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be achieved by either increasing the upstream pressure or lowering the downstream pressure. A Multistage Restric-tion Orifice assembly will enable staged reductions in pressure to prevent choked flow occurring.

Rototherm Multistage Restriction Orifice Plates are manufac-tured from a wide range of materials and are engineered to meet specific project process conditions and requirements. Plates are usually welded into pipe with a separation of one pipe diameter, the number of plates and orifice bores being determined by calculation.

Process connections to existing pipe work can be either stand-ard process flanges or machined ends suitable for butt weld-ing.

As well as multistage assemblies - Rototherm manufacture a wide range of standard plate orifice plates - ‘concentric square edged’ for general application, ‘conical entrance’ or ‘quarter circle’ for low Reynolds number flows, and ‘segmental’ or ‘ec-centric’ for flows containing light solids and slurries.

Click on the icon below to access more information on the Rototherm range of primary flow elements including multi- stage orifice plate assemblies

in focus

All Rototherm tyre pressure gauges are supplied calibrated before

leaving our factory - and - if required - a factory calibration certifi-

cate can be supplied (traceable to UK National Standards).

The gauge is offered with either a fixed or flexible hose for connect-

ing to the tyre - and each gauge is supplied with a choice of Type

5265 (small bore) and Type 4660A (large bore) Schrader™valve fit-

tings - with quick release connections.

A robust ABS carry

case is offered as a

useful accessory.

SafeGauge is currently

being supplied to major

airlines, aircraft

manufacturers

and ground

support

companies

around the

world from

Australia to North

America, Europe to Asia.

SafeGauge safety pattern tyre pressure gauges are now available to

buy online from Rototherm’s E-Commerce website.

www.rototherm-online.co.uk

The Rototherm SafeGauge safety pattern tyre pressure gauge incor-

porates a series of new and unique features that have given rise to

new standards of safety in aircraft ground support.

The SafeGauge is available with a 100 mm dial and uses the unique

“SafeCase“ solid front, blow out back design that provides operator

protection, over and above the basic requirements of the European

Pressure Gauge Standard EN837.

Being retained on the gauge by a centre screw, the blow out back

prevents the risk of injury due to flying debris from the rear of the

case in the unlikely event of Bourdon tube failure.

Protected in a rubber case, the SafeGauge is a robust, easy to use

pressure gauge ready for the most demanding ground support

requirements.

Elite SafeGauge Aircraft Tyre Pressure Gauge A

pplic

atio

n Fo

cus

4

in focus 5

Rototherm Online - all change on the web!

All websites in the Rototherm group are getting a design make-over

with all content being updated with the latest news and informa-

tion. The first site to get a all new look is that of RTD-Products - the

UK’s leading manufacturer of platinum resistance temperature de-

tectors.

Over the coming months - the RTD site will be available in French,

German and Spanish languages. An e-commerce site is also planned

to be in place early in 2012.

New Rototherm Website

Set to launch fully in early 2012, the rototherm.co.uk site will com-

bine a new look with a wealth of new and updated technical infor-

mation ensuring the most up to date information on our products

is available 24/7.

Rototherm E-Commerce Site

In an exciting development British Rototherm has launched its first

e-commerce site - Rototherm Online.

Initially available to UK customers only, the site offers a wide range

of Rototherm products, available on fast delivery times, as well as

representing a considerable price saving on standard list prices.

The objective of the site is to give our UK customers a faster, more

economical way of buying their product - 24 hours a day, 7 days a

week.

Products featured on the Rototherm Online web site include:

• Chart Paper

• Disposable fibre tipped pens for all Rototherm Chart Recorders

• Chart Drive Motors

• Stainless steel pressure gauges - available in a wide range of dial

sizes, process connections and pressure ranges

• Sentinel Chart Recorders

• Aircraft Tyre Pressure Gauges

• Pressure Gauge Accessories

New products to be added to the site in the coming months will

include:

• Orifice Plates

• Thermowells

• Temperature Assemblies

• Temperature Transmitters

Payment can be made via the Secure server by all major credit and

debit cards and all stock items are despatched with 2 working days

for fast delivery.

A sneak preview of the new Rototherm site - www.rototherm.co.uk

The new RTD products website - www.rtd-products.co.uk

in focus

Since Rototherm manufactured the first bimetallic back in 1934, Rototherm products have been widely used by dairy farmers and producers across the world.

Ideal for food and dairy process applications, our high quality instruments are regarded as the most reliable and accurate to be found anywhere.

Included in the dairy range is the dedicated Sentinel Pasteur-ising Recorder Controller. The 3 pen format allows recording of HOT and COLD product temperatures, plus an EVENT PEN which records Divert Valve position on any portion of the chart. Recording using “dual-zone” or “half-chart” format is easily set-up, and event pen step sizes are easily adjusted to suit any user.

DIVERT CONTROL is a standard feature with accurate, reliable switching via a 6 amp output relay. An additional DIVERT PRO-TECT facility allows over temperature trip-out if the sensor fails.

An advanced BACK-LIT DISPLAY offers the user a UNIQUE in-dication of the pasteuriser status during operation. The HOT and COLD values are continuously indicated on the top display line, whilst “FORWARD”, “DIVERT”, “AUTO” or “MANUAL” are shown on the bottom display line, and continuously updated as the status changes.

Sentinel:Dairy pasteuriser product application

Application Focus

Control/Alarm SET POINTS are easily displayed at the touch of a button and the status of output relays is continually indicated by colour-coded LED’s.

Three selectable levels of SECURITY, including password and hardware locks are available to stop unauthorised access and alteration of the instrument.

Housed in a STRONG steel case, which can be wall, panel or pipe mounted, the Sentinel is designed for rugged environ-ments.

A gasketed lockable door with tough acrylic window protects the internal components to IP65. The slim case is ideal for shal-low compartments, and will RETROFIT in place of Rototherm, Negretti, Honeywell, ABB Kent-Taylor, Chessel or Foxboro mod-els.

The Sentinel is SIMPLE TO OPERATE. Sensor type, chart range, display units, chart speed and relay actions are easily and quickly modified if needed. The Sentinel SEN 30P can be sup-plied fully set-up to suit individual customer requirements and makes full use of the EXTENSIVE list of pre-printed pasteurising charts in the Rototherm range.

Standard version Sentinel Chart recorders are now available to buy

online from Rototherm’s E-Commerce website:

www.rototherm-online.co.uk

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in focus

As the UK’s leading manufacturer of industrial instrumentation, it’s

no wonder the world’s leading power generation companies have

come to trust us for the supply of quality temperature, pressure and

flow measuring equipment.

With over 100 years combined manufacturing experience, British

Rototherm and Thermocouple Instruments have come together to

form the UK’s premier instrument supplier.

Rototherm manufactures a range of products specifically designed

for use in the power generation industry.

These include:

• Mineral Insulated Power Station Thermocouples

• Seamless Stainless Steel Sheathed Mineral Insulated

Thermocouples

• Sheath material options: 310, 321, 316 stainless steel and

Inconel 600

• Options for 1.5mm, 3mm, 4.5mm and 6mm diameter Mineral

Insulated cable

• GDCD16 power station specification material available.

• Acromet solid tip extensions available on all MI cable

diameters.

Providing cost effective solutions for the power generation industry

Rototherm also offers an extensive range of thermowells that are

used extensively in the power, process, pharmaceutical and petro-

chemical industries.

Thermowells are used to protect temperature

indicators and sensors from process media and

enable the servicing or replacement of sensors

without the need to shut down plant.

Available in a wide range of styles and

materials, all British Rototherm thermowells

are manufactured to the highest standards

of finish in our modern, well equipped

machine shop and are manufactured to

Rototherm’s high quality standard that is

approved to ISO9001:2008.

Rototherm is proud to supply

instrumentation to all of the UK’s leading

power generation supply companies, as well

as manufacturers of power generation equipment.

Click on the icon below to access more information on the Rototherm range of temperature assemblies and probes.

Industry Focus

ATEXAPPROVED PRODUCTS 7

in focus

Contact usOur Address:

British Rototherm Company LimitedKenfig industrial Estate, Margam, Port Talbot SA13 2PWUnited Kingdom

Tel: +44 (0) 1656 740 551 Fax: +44 (0) 1656 745 915Email: sales@rototherm.co.uk

Our Group Websites:

Rototherm’s Global site www.rototherm.co.ukRototherm’s E-commerce site www.rototherm-online.co.ukRTD Products www.rtd-products.co.ukBentley Instruments www.benetly-instruments.comBentley Instruments E-commerce site www.bentley-online.ie

TM

ISO9001:2008

In|focus Magazine is published by the British Rototherm Company Limited. © 2011 British Rototherm Company Limited. All rights reserved. Company registration number 2570730. Registered office as above.

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Rototherm worldwideRototherm customers are served by a Global Distributor Network, and by worldwide offices and distribution facilities staffed by dedi-cated teams of experts.

Covering all continents, Rototherm distributors can be relied upon for technical support and service.

For details of your nearest Rototherm distributor or stockist - please contact us.

For over seventy five years, throughout the world, British Rototherm equipment has been installed wherever reliability and long lasting performance is demanded. One of the world’s leading manufacturer of industrial instrumenta-tion, British Rototherm products are manufactured in its modern factory located in the South Wales region of the United Kingdom. Sited on 6 acres of land at Kenfig Industrial Estate, the company op-erates from a 60,000 square feet (5,574m square metre) factory. Working closely with our customers around the world, Rototherm has developed products for use in a variety of different industrial applications.

As well as offering a world class product, Rototherm provides its cus-tomers with a level of service and support that is second to none. With a firm understanding of our customer technical requirements, we are able to offer a products that will be right first time, every time. With competitive prices, short delivery times and an commitment to quality that goes beyond the expectations of our customers, Roto-therm must be the supplier of choice for all of your industrial instru-mentation needs.

Over seventy five years of manufacturingexperience

British Rototherm has accreditation to the latest ISO standard ISO9001:2008