australian topics - spirax sarco€¦ · · 2014-10-16discussed the ph control of boiler water....

Issue 11- 2010$5.95

Dry Steam.

More Heat.

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spiraxsarcoAustralian TOPICS

AlSO In ThIS ISSue:

How alkalinity effects the quality of feedwater Page 2Generate a Cleaner Future Page 4

Boiler feedtank efficiency Page 6 High pressure sight glass Page 7

2

For more information on how you can Reduce Costs, Save Water, Reduce CO2 and Save Energy,

please call us on: 1300 SPIRAX (774 729) or email us at [email protected]

2

Water TreatmentHow alkalinity affects the quality of feedwater

In the last Topics issue we briefly

discussed the pH control of boiler

water. In this issue we will continue

this discussion by looking at how

alkalinity in feedwater affects the

boiler and steam generating system.

What is alkalinity?Alkalinity, put in simple terms, means those components of water, which will react with acid. But having alkalinity is not enough, as not all sources of alkalinity are equally good for boilers.

Water treatment engineers refer to three types of alkalinity:

1. Natural Alkalinity

Almost all untreated raw water sources contains some level of natural alkalinity. The nature of the alkalinity is dependent on what species are present and the pH of the raw water. This is either “Bicarbonate” or “Carbonate” alkalinity

2. Caustic Alkalinity(OH)

is the alkalinity that is added to the boiler. This “Caustic” alkalinity, also called OH (hydroxide) or “hydrate” alkalinity, is supplemented by water treatment engineers. An alkalinity builder such those from the Spirax “Alpha” series will be added to ensure adequate hydroxide alkalinity to control corrosion and scale.

3. Total Alkalinity (M)

Any raw water, feed water or boiler water may have either one or a combination of both types 1 and 2. The total alkalinity is equal to the caustic alkalinity plus the carbonate alkalinity, also known as M alkalinity.

WaterTreatment

WaterTreatment

TreatmTreatment

TreatmTreatment

Water TreatmWaterTreatment

WaterTreatment

TreatmTreatment

WaterTreatment

Spirax water treatment specialists

are routinely testing boiler water and

feedwater by titration to ensure adequate

alkalinity levels. Controlling Total Alkalinity

(M) is important in lower pressure boilers

where it varies directly with pH, corrosion

inhibition and control of carry-over.

Controlling Feedwater alkalinity:

• Ensures adequate control of bicarbonates and minimising ability to cause acid corrosion in steam condensate lines

• Aids in protecting feed lines and feed tanks from corrosion

Controlling Boiler water alkalinity:

• Ensures proper formation of magnetite fi lm for maximum corrosion protection of boiler tubes

• Hydroxide alkalinity is required to condition calcium phosphate sludge in precipitating programs to ensure soft deposit removal via bottom blowdown, making for cleaner boiler on survey inspection

• Adequate hydroxide alkalinity is required to keep silica in solution to prevent silica scale formation on boiler tubes, particularly for coil boilers

• Controlling Total Alkalinity minimises risk

from foaming and carry-over of boiler water into the steam system. Carry-over can cause water hammer where slugs of boiler water can damage machinery, and dissolved or suspended solids in the boiler water will deposit in the steam and condensate system

• In higher-pressure water tube boilers, there are severe restrictions limiting hydroxide alkalinity to prevent caustic embrittlement or cracking. This is a particular problem in riveted boilers and the rolled tube ends in modern boilers are also vulnerable areas of attack.

SummaryTo maximise the life of your boiler and steam condensate system ask your Spirax water treatment specialist to conduct a full review of alkalinity of the raw water, feed water and boiler water at your plant. Every plant is different and the chemical program should refl ect the specifi c needs of your site.

Howard DavisAus / NZ WaterTreatment Manager

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FOR MORE INFORMATION CONTACT SPIRAX SARCO ON 1300 SPIRAX (774 729) OR EMAIL US AT: [email protected]

The BoilerThe boiler is the heart of the steam system. The typical modern packaged boiler is powered by a burner which sends heat into the boiler tubes.

The hot gases from the burner pass backwards and forwards up to 3 times through a series of tubes to gain the maximum transfer of heat through the tube surfaces to the surrounding boiler water. Once the water reaches saturation temperature (the temperature at which it will boil at that pressure) bubbles of steam are produced, which rise to the water surface and burst. The steam is released into the space above, ready to enter the steam system. The stop or crown valve isolates the boiler and its steam pressure from the process or plant.

The Steam and Condensate Loop

This insert is intended to give a brief, non-technical overview of the steam plant. It offers an overall explanation of how the different parts of the steam plant relate to each other – and represents useful reading for anyone who is unfamiliar with the topic, prior to progressing to the next Block, or, indeed, before undertaking any form of detailed study of steam theory or steam plant equipment.

READ MORE IN OUR INSERT

The Boiler House

Insant Knowledge KnowledgeInsant Knowledge

Treatm

2010 SEMINARSSA Seminars:MAKING THE MOST OF STEAM THROUGH EFFICIENCY &ENERGY RECOVERY(DURATION: 1 DAY EACH)November 8 & 9

QLD Seminars:TWO DAY INSTRUCTION COURSE & SEMINAR STEAM AND WATER TREATMENTNovember 11 & 12

Vic Seminars:BASIC STEAM TRAINING(DURATION: 1 DAY)November 17

4

Please contact us if you want more information on the CSG range and its applications.

Contact your local Spirax Sarco offi ce or Sales Engineer on 1300 SPIRAX (774 729) TODAY.

Generate a Cleaner FutureThe packaged CSG

With the increased emphasis on higher standards and quality, in some applications, the quality of process steam is deemed no longer adequate and clean steam is required. The industries that are looking at a ‘cleaner way’ include pharmaceutical, food producers, breweries and hospitals where the standard of steam in sterilisers is closely scrutinised.

Spirax has now successfully introduced CSG (clean steam generator) to the Australian market, with successful installations into global brand companies. The generator uses process steam to heat and convert purifi ed water into low pressure clean steam. This is done through a clean steam heat exchanger c/w appropriate modulating controls within the generator.

The result is very high quality clean steam that is distributed through stainless steel valving and pipework from the unit to the required area of use on the product or cleaning surface. This guarantees a consistent quality of both, steam and product.

Clean steam generators have wide use within many industries especially nowadays as legislation and industry standards tighten. Confectionery, food production brewing, pharmaceutical and hospitals are all areas where clean steam could be required.

The steam can be used to control moisture levels, in sterilization, CIP, direct injection and many more applications. Any application where the steam is in direct contact with the product or the surface the product is passed through, could be a candidate for a clean steam application.

Cleaner FutureCleaner Future

Most factories that use steam, rely on the process steam produced by a packaged steam boiler, be it watertube, fi retube or vertical tubeless in style. Historically the quality of steam produced by such boilers is ideal for hundreds of different applications throughout industry from food processing to oil refi neries, from breweries to hospitals.

Craig McKnightNSW State ManagerSpirax Sarco

CLEAN STEAM GENERATORS

• Clean steam • Consistent product • Guaranteed quality • Piece of mind

Keep it clean! Make sure you are ahead of the game in your industry.

CONTACT SPIRAX SARCO ON 1300 SPIRAX (774 729) TO LEARN MORE!

If steam is pressurised, it will occupy less space. Steam boilers are usually operated under pressure, so that more steam can be produced by a smaller boiler and transferred to the point of use using small bore pipework. When required, the steam pressure is reduced at the point of use.

As long as the amount of steam being produced in the boiler is as great as that leaving the boiler, the boiler will remain pressurised. The burner will operate to maintain the correct pressure. This also maintains the correct steam temperature, because the pressure and temperature of saturated steam are directly related.

The boiler has a number of fi ttings and controls to ensure that it operates safely, economically, effi ciently and at a consistent pressure.

The boiler house (cont)The boiler is the heart of the steam system. The typical modern packaged boiler is powered by a burner which sends heat into the boiler tubes.

The hot gases from the burner pass backwards and forwards up to 3 times through a series of tubes to gain the maximum transfer of heat through the tube surfaces to the surrounding boiler water. Once the water reaches saturation temperature (the temperature at which it will boil at that pressure) bubbles of steam are produced, which rise to the water surface and burst. The steam is released into the space above, ready to enter the steam system. The stop or crown valve isolates the boiler and its steam pressure from the process or plant.

Fig. 1.3.1 Typical heat path through a smoke tube shell boiler

Cont from P.3

Case for Steam Steam and the Condensate Loop

STEAM CAN BE EASILY AND EFFECTIVELY DISTRIBUTED


Case for Steam - The Energy MediumCase for Steam

FeedwaterThe quality of water which is supplied into the boiler is important. It must be at the correct temperature, usually around 80°C, to avoid thermal shock to the boiler, and to keep it operating effi ciently. It must also be of the correct quality to avoid damage to the boiler.

Ordinary untreated potable water is not entirely suitable for boilers and can quickly cause them to foam and scale up. The boiler would become less effi cient and the steam would become dirty and wet. The life of the boiler would also be reduced.

The water must therefore be treated with chemicals to reduce the impurities it contains.

Both feedwater treatment and heating take place in the feedtank, which is usually situated high above the boiler. The feedpump will add water to the boiler when required. Heating the water in the feedtank also reduces the amount of dissolved oxygen in it. This is important, as oxygenated water is corrosive.

BlowdownChemical dosing of the boiler feedwater will lead to the presence of suspended solids in the boiler. These will inevitably collect in the bottom of the boiler in the form of sludge, and are removed by a process known as bottom blowdown. This can be done manually - the boiler attendant will use a key to open a blowdown valve for a set period of time, usually twice a day.

Other impurities remain in the boiler water after treatment in the form of dissolved solids. Their concentration will increase as the boiler produces steam and consequently the boiler needs to be regularly purged of some of its contents to reduce the concentration. This is called control of total dissolved solids (TDS control). This process can be carried out by an automatic system which uses either a probe inside the boiler, or a small sensor chamber containing a sample of boiler water, to measure the TDS level in the boiler. Once the TDS level reaches a set point, a controller signals the blowdown valve to open for a set period of time. The lost water is replaced by feedwater with a lower TDS concentration, consequently the overall boiler TDS is reduced.

Steam and the Condensate Loop

Fig. 1.3.2 A sophisticated feedtank system where the water is being heated by steam injection


Case for Steam - The Energy MediumCase for Steam - The Energy MediumCase for Steam

Steam is the best choice as an environmentally friendly energy medium.

Steam and the Condensate Loop

Level controlIf the water level inside the boiler is not carefully controlled, the consequences could be catastrophic. If the water level drops too low and the boiler tubes are exposed, the boiler tubes could overheat and fail, causing an explosion. If the water level becomes too high, water could enter the steam system and upset the process.

For this reason, automatic level controls are used. To comply with legislation, level control systems also incorporate alarm functions which will operate to shut down the boiler and alert attention if there is a problem with the water level. A common method of level control is to use probes which sense the level of water in the boiler. At a certain level, a controller will send a signal to the feedpump which will operate to restore the water level, switching off when a predetermined level is reached. The probe will incorporate levels at which the pump is switched on and off, and at which low or high level alarms are activated. Alternative systems use fl oats.

Fig. 1.3.3 Typical boiler level control/alarm confi guration


Case for Steam - The Energy MediumCase for Steam - The Energy MediumCase for Steam - The Energy MediumCase for Steam Steam and the Condensate Loop

The fl ow of steam to the plantWhen steam condenses, its volume is dramatically reduced, which results in a localised reduction in pressure. This pressure drop through the system creates the fl ow of steam through the pipes.

The steam generated in the boiler must be conveyed through the pipework to the point where its heat energy is required. Initially there will be one or more main pipes or steam mains which carry steam from the boiler in the general direction of the steam using plant. Smaller branch pipes can then distribute the steam to the individual pieces of equipment.

Steam at high pressure occupies a lower volume than at atmospheric pressure. The higher the pressure, the smaller the bore of pipework required for distribution of a given mass of steam.

Steam qualityIt is important to ensure that the steam leaving the boiler is delivered to the process in the right condition. To achieve this the pipework which carries the steam around the plant normally incorporates strainers, separators and steam traps.

A strainer is a form of sieve in the pipeline. It contains a mesh through which the steam must pass. Any passing debris will be retained by the mesh. A strainer should regularly be cleaned to avoid blockage. Debris should be removed from the steam fl ow because it can be very damaging to plant, and may also contaminate the fi nal product.

The steam should be as dry as possible to ensure it is carrying heat effectively. A separator is a body in the pipeline which contains a series of plates or baffl es which interrupt the path of the steam. The steam hits the plates, and any drops of moisture in the steam collect on them, before draining from the bottom ofthe separator.

Steam passes from the boiler into the steam mains. Initially the pipework is cold and heat is transferred to it from the steam. The air surrounding the pipes is also cooler than the steam, so the pipework will begin to lose heat to the air. Insulation fi tted around the pipe will reduce this heat loss considerably.

When steam from the distribution system enters the steam using equipment the steam will again give up energy by: a) warming up the equipment and b) continuing to transfer heat to the process.

As steam loses heat, it turns back into water. Inevitably the steam begins to do this as soon as it leaves the boiler. The water that forms is known as condensate, which tends to run to the bottom of the pipe and is carried along with the steam fl ow. This must be removed from the lowest points in the distribution pipework for several reasons:

STEAM IS CLEAN STEAM IS EFFICIENT

Fig. 1.3.5Cut section of a separator showing operation

Steam in

Steam out

Condensate to drain via a fl oat trap


Case for Steam - The Energy MediumCase for Steam - The Energy MediumCase for Steam Steam and the Condensate Loop

• Condensate does not transmit heat effectively. A fi lm of condensate inside plant will reduce the effi ciency with which heat is transferred.

• When air dissolves into condensate, it becomes corrosive.

• Accumulated condensate can cause noisy and damaging waterhammer.

• Inadequate drainage leads to leaking joints.

A device known as a steam trap is used to release condensate from the pipework whilst preventing the steam from escaping from the system. It can do this in several ways:

• A fl oat trap uses the difference in density between steam and condensate to operate a valve. As condensate enters the trap, a fl oat is raised and the fl oat lever mechanism opens the main valve to allow condensate to drain. When the condensate fl ow reduces the fl oat falls and closes the main valve, thus preventing the escape of steam.

• Thermodynamic traps contain a disc which opens to condensate and closes to steam.

• In bimetallic thermostatic traps, a bimetallic element uses the difference in temperature between steam and condensate to operate the main valve.

Once the steam has been employed in the process, the resulting condensate needs to be drained from the plant and returned to the boiler house. This process will be considered later in this Module.

Pressure reductionAs mentioned before, steam is usually generated at high pressure, and the pressure may have to be reduced at the point of use, either because of the pressure limitations of the plant, or the temperature limitations of the process.

This is achieved using a pressure reducing valve.

Steam at the point of useA large variety of steam-using plant exists. A few examples are described below:

• Jacketed pan - Large steel or copper pans used in the food and other industries to boil substances - anything from prawns to jam. These large pans are surrounded by a jacket fi lled with steam, which acts to heat up the contents.

• Autoclave - A steam-fi lled chamber used for sterilisation purposes, for example medical equipment, or to carry out chemical reactions at high temperatures and pressures, for example the curing of rubber.

• Heater battery - For space heating, steam is supplied to the coils in a heater battery. The air to be heated passes over the coils.

• Process tank heating - A steam fi lled coil in a tank of liquid used to heat the contents to the desired temperature.

• Vulcaniser - A large receptacle fi lled with steam and used to cure rubber.

• Corrugator - A series of steam heated rollers used in the corrugation process in the production of cardboard.

• Heat exchanger - For heating liquids for domestic/industrial use.

Control of the processAny steam using plant will require some method to control the fl ow of steam. A constant fl ow of steam at the same pressure and temperature is often not what is required – a gradually increasing fl ow will be needed at start-up to gently warm the plant, and once the process reaches the desired temperature, the fl ow must be reduced.

Control valves are used to control the fl ow of steam. The actuator, see Figure 1.3.6, is the device that applies the force to open or close the valve. A sensor monitors conditions in the process, and transmits information to the controller. The controller compares the process condition with the set value and sends a corrective signal to the actuator, which adjusts the valve setting.


Case for Steam - The Energy MediumCase for Steam - The Energy MediumCase for Steam - The Energy MediumCase for Steam - The Energy MediumCase for Steam Steam and the Condensate Loop

A variety of control types exist:

• Pneumatically actuated valves - Compressed air is applied to a diaphragm in the actuator to open or close the valve.

• Electrically actuated valves - An electric motor actuates the valve.

• Self-acting - There is no controller as such - the sensor has a liquid fi ll which expands and contracts in response to a change in process temperature. This action applies force to open or close the valve.

Condensate removal from plantOften, the condensate which forms will drain easily out of the plant through a steam trap. The condensate enters the condensate drainage system. If it is contaminated, it will probably be sent to drain. If not, the valuable heat energy it contains can be retained by returning it to the boiler feedtank. This also saves on water and water treatment costs.

Sometimes a vacuum may form inside the steam using plant. This hinders condensate drainage, but proper drainage from the steam space maintains the effectiveness of the plant. The condensate may then have to be pumped out.

Mechanical (steam powered) pumps are used for this purpose. These, or electric powered pumps, are used to lift the condensate back to the boiler feedtank.

Fig. 1.3.6 A pneumatically operated two port control valve

Springs

Diaphragm

Actuator

Valve

Valve stem

Movement

Valve plug


Case for Steam - The Energy MediumCase for Steam - The Energy MediumCase for Steam - The Energy MediumCase for Steam - The Energy MediumCase for Steam Steam and the Condensate Loop

STEAM IS COMPETITIVE

STEAM IS NON-VOLATILE

Steam is the best choice as anenvironmentally friendly energy medium.

Energy monitoringIn today’s energy conscious environment, it is common for customers to monitor the energy consumption of their plant.

Steam fl owmeters are used to monitor the consumption of steam, and used to allocate costs to individual departments or items of plant.

Australian Easi Heat


Case for Steam - The Energy MediumCase for Steam - The Energy MediumCase for Steam - The Energy MediumCase for Steam

QUESTIONS What is the purpose of the multi-flue passes in a 1. boiler?

a) To reduce the amount of flue gases exhausted

b) To help produce drier steam

c) To provide more even generation of steam bubbles

d) To give a greater heat transfer area to the water

2. What is the purpose of the boiler feedtank?

a) To store chemically treated water for the boiler

b) To provide a reservoir of hot water for the boiler

c) To collect condensate returning from the plant

d) All of the above

3. The boiler feedtank is heated to approximately what temperature?

a) 80°C

b) 20°C

c) Steam temperature

d) It isn’t heated, all heating takes place in the boiler

4. What is the purpose of boiler bottom blowdown?

a) To remove total dissolved solids in the boiler water

b) To remove separated out oxygen

c) To dilute the boiler water to reduce TDS

d) To remove solids which collect in the bottom of the boiler

5. What is used to remove suspended water particles in a steam main?

a) A separator and steam trap

b) A strainer and steam trap

c) A strainer

d) A reducing valve

5. Which of the following is the purpose of a boiler automatic level control ?

a) A separator and steam trap

b) To maintain a specified level of water

c) To comply with legislation

d) To take corrective action if the boiler alarms sound

Answers: 1:d, 2:d, 3:a, 4:d, 5:aSteam and the Condensate Loop

Water + Energy = Steam

Steam + Work Done = Condensate (Water)

Condensate Returned = Reduced WaterConsumption, Reduced Emissions and Dollars Saved

iPhone screenshots

55

Contacting Us – Queensland and South Australia NEW addresses

Spirax Sarco would like to introduce our free application to assist customers and sales engineers when identifying the right steam

tools for the job. Spirax Sarco is the global leader in the supply of engineered solutions for the effi cient design, maintenance and operation of industrial and commercial steam systems.

The Steam Tools app enables quick and easy access to both our Steam Tables and a Saturated Steam Pipe Sizing tool.

The Steam Tables cover the thermodynamic data for water/steam, supporting the design and operation of expert steam/water equipment. You simply need to enter a pressure or a temperature into the app, returning:

• The corresponding pressure or temperature

• Water (hf) (Sensible Heat)

• Evaporation (hfg) (Latent Heat)

• Steam (hg) (Total Heat)

• Specifi c Volume Steam

The pipe sizing tool allows access to Saturated Steam pipeline data, helping you to size a pipeline.

To enhance the feature set, both tools offer the output of this data into a range of different standardised units.

Download today to get access to this useful tool, and the opportunity to see what else Spirax has to offer. Plus sign up to our service to keep up to date on future enhancements and our products.

For more information on Spirax Sarco

go to http://www.spiraxsarco.com or

visit http://itunes.apple.com/us/app/

steam-tools/id378289552?mt=8#

Free iPhone AppFree iPhone App iPhone App iPhone App iPhone App

Free iPhone AppDownload today to get access to this useful tool

DOWNLOAD THE SPIRAX SARCO iPhone APP!

NEW SOUTH WALES

14 Forge Street(PO Box 6308 Delivery Centre)BLACKTOWN NSW 2148

Ph: 1300 SPIRAX (774 729)Fax: (02) 9831 8519E-mail: [email protected]

VICTORIA

4A/9 Jersey Road(PO Box 353)BAYSWATER VIC 3153

Ph: 1300 SPIRAX (774 729)Fax: (03) 9720 5224E-mail: [email protected] com

QUEENSLAND

57 Distribution StreetLARAPINTA QLD 4110


SOUTH AUSTRALIA

Unit 5/ 6 Walla StLONSDALE SA 5160


WESTERN AUSTRALIA

1/14 Bannick CourtCANNING VALE WA 6155


NEWADDRESS NEW

ADDRESS

6

If you would like more information about Feedtanks, please contact Spirax Sarco on 1300 SPIRAX (774 729)

Too often, the boiler feed tank is considered to be a simple tank containing hot water for feeding into a steam boiler. This it surely is, but ensuring that the water is thoroughly heated, maintained at the necessary temperature, and delivered to the boiler in a gas-free properly conditioned state at all times, is not simple, and is often overlooked…although it is easy!

To understand what’s required, you need to appreciate what else a boiler feed tank must do, besides being simply a source of hot water. Very hot water is actually required, so cold water must be heated to the required high temperature and effi ciently mixed with any hot returned condensate and fl ash steam. The point that is so often overlooked here is that hot water is naturally less dense than cold water, so given the opportunity, it will rise to (or stay at) the top of the tank, and cold water will sink to (or stay at) the bottom, where the outlet to the boiler usually is!

This separation of hot and cold water is known as stratifi cation. It will always occur in a poorly designed feed tank, and can often be detected by touch – feel the (uninsulated) side of the tank from top to bottom, and especially at the outlet to the boiler. All points should be at the same temperature – too hot to touch in fact!

We frequently fi nd that the temperature of the water going to the boiler, from the bottom of the tank, is cold to warm, in spite of the fact that the temperature gauge in the tank, higher up, shows a steady temperature of say 85°C. There should in fact always be two temperature gauges on a boiler feed tank installation; one on the tank itself of course, and one in the feed line going to the boiler, so that the actual temperature going to the boiler can be monitored. The latter needs to

Boiler FeedwaterBoiler FeedwaterA boiler feed tank is aBoiler Feedwater Conditioner

be constantly monitored over a period of time, because changing conditions (boiler load, feed pump on or off, relative proportions of condensate return and cold water make-up) often result in widely varying feed temperatures. It’s best if a datalogger is used over a period of at least one full normal working day, and the actual temperature at every moment in time displayed on a graph. Perfection is a straight line at 95°C or higher, or at least 85°C, but lower and variable temperatures are common.

A consistently high temperature in the feed tank is needed to ensure that dissolved gases (present in all natural waters) are reliably driven off and vented

to atmosphere – otherwise they’ll be driven off when the water gets into the boiler, where they’ll then mix with the steam. These non-condensable gases (NCGs) contain no heat (compared to condensing steam), so they reduce the steam’s heating effect, especially in sterilizing and similar applications. They are also a major cause of corrosion.

Water treatment regimes usually aim to reduce the dissolved gases in the feedwater (usually via oxygen scavengers), but chemical treatment alone can never be as effective as thorough heating of the water to as high a temperature as possible. And “thorough heating” means:

By Graham SmithBusiness Development Manager SteamQuality Testing

Fig. 1. A Spirax Sarco Boiler Feed Tank.

7

If you would like more information about Feedtanks, please contact Spirax Sarco on 1300 SPIRAX (774 729)

High Pressure Sight Glass

Applicationsand IndustriesThey can be used on fluids other than steam and condensate within food, pharmaceutical, OPC, institutions and general industry. Under certain conditions corrosive elements in condensate can affect the inside face of the window, particularly where caustic, alkali and hydrofluoric acid is present. Mica inserts are to be used on these applications.

Product Release

Sight Glasses with Borosilicate glass are known as: SGC40 – Sight Glass in Carbon Steel 40 barg SGS40 – Sight Glass in Stainless Steel 40 barg. Sight Glasses with Mica glass protectors are known as: SGC40M – Sight Glass in Carbon Steel 40 barg with Mica insert SGS40M Sight Glass in Stainless Steel 40 barg with Mica insert.

An optional visual flow indicator flap and spring is available to enhance the visibility of the flow of fluid in the pipeline.

The range is available in Carbon Steel or Stainless Steel, in sizes DN15-50 with screwed, socket weld, flanged and Tri-Clamp connections.

Product range available

Boiler FeedwaterProduct ReleaseBoiler FeedwaterProduct Release

The SGC40 & SGS40 are PN40/ASME 300 rated double window, high pressure sight glasses that provide a solution for easy inspection for the detection of fl ow, i.e. to detect blocked valves, strainers, steam traps and other pipeline products.

FEATURES BENEFITS

Pressure rating PN40/ASME 300 Wide range of applications

Design incorporates:• Double window• Large viewing area• Unique design creating

additional turbulence

Allows easy inspection of flow media

Optional flow indicator flap Enhanced flow indication

Borosilicate glass windows High level of safety and integrity

Optional Mica insert for steam, condensate and high pH applications.

Additional protection of glass for steam, condensate and high pH applications.

Sight GlassHigh Pressure Sight Glass

Sight GlassHigh Pressure Sight Glass

1. having a tank of adequate size and shape, with an adequately sized vent,

2. having the water heating system as low down in the tank as possible,

3. properly injecting or sparging returned condensate and fl ash steam as low in the tank as possible,

4. injecting or sparging cold make-up water as high in the tank as possible,

5. ensuring that the outlet to the boiler delivers the hottest possible water,

6. ensuring that any chemical dosing into the tank properly mixes into all the water (too often we see a plastic tube thoughtlessly dropped into the tank, with its open end next to the boiler off-take, resulting in concentrated chemicals getting sucked into the boiler), and

7. having all connections and components arranged to ensure

thorough and adequate mixing at all times (sometimes a circulating pump is required).

Addressing all these points (and more) makes you realise that a feed tank would be better called a Boiler Feed Water Conditioner, and the simplest way of doing this is to specify a Spirax Sarco Boiler Feed Tank. We have a standard range with various options to suit typical boiler sizes. Apart from this, the necessary design principles are outlined in a leafl et, available on request, on which you can base your own design. We can even help you do this, and build and install the tank for you. And if you’d like your existing installation checked out, we can do this too, and datalog the actual temperature of the water being pumped into your boiler, and determine the actual amount of non-condensable gases (NCGs) in your steam.

CONTINUED FROM PAGE 6.

❒ Pamphlet – Standard Spirax Sarco Boiler Feed Tanks

❒ Leafl et – A well-designed boiler feed tank

❒ Service – Inspect my current feed tank installation and/or water treatment regime

❒ Service – Datalog my actual boiler feedwater temperature

❒ Service – Determine the NCG content of my steam

❒ Service – Help me design (and build?) my own boiler feed tank

✁

Tick below for more information.Then post to:Spirax Sarco PO Box 6308 BLACKTOWN NSW 2148OR Fax to: (02) 9831 8519

If unclaimed please return to:Spirax SarcoMarketing DepartmentPO Box 6308BLACKTOWN NSW 2148

PRINTPOST

PP255003/04601

POSTAGEPAID

AUSTRALIA

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We hold seminars and training courses Australia wide.

Call 1300 SPIRAX (774729) and fi nd out when we are holding one in your state!Training Courses

• This great book is prepared by experts from Spirax Sarco, a world leader in steam engineering.

• The ‘Steam and Condensate Loop’ book explains the principles of steam engineering and heat transfer.

• It covers all aspects of steam and condensate systems, from the boiler house, through the steam distribution

system to the point of use, recovering, and returning condensate back tothe boiler.

• With practical application knowledge to deliver energy saving solutions, this is an indispensable reference and an invaluable tool for all engineers working with steam.

The Steam and Condensate Loop BookNow Available

'The Tracer'

SAVE ENERGY TODAY • With energy prices still rising, Spirax Sarco Topics providespractical tips you can use today to cut your fuel bills straight away.

Issue 11- 2010$5.95

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spiraxsarcospiraxsarcoAustralian TOPICS

AlSO In ThIS ISSue:

How alkalinity effects the quality of feedwater Page 2Generate a Cleaner Future Page 4

Boiler feedtank efficiency Page 6 High pressure sight glass Page 7

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AppleiPad!

Spirax Sarco would like to thank all who responded to our Customer Survey in thelast issue! Make sure you enter our competition for a chance to

Snezana Novakovic Marketing Assistant Spirax Sarco

DOWNLOAD THESPIRAX SARCOiPhone APP!

To enter online visit

spiraxsarco.com/au and follow the instructions

WIN!Enter our

Competition for

Your Chance to

The New Apple iPad 16GB

WIN!

MAIN PRIZE:ThE APPlE IPAd 16GB Micro Sim not included.

SECONd PRIZE:SPIRAX SARCO ENGINEERING SEMINAR

Spirax Sarco offers customised steam engineering seminars. Enter the competition for a chance to broaden your steam knowledge.

ABOUT THE PRIZES

The New Apple iPad 16GB

Name ...................................Company .....................................

Position ....................................................................................

Phone number ..........................................................................

Company address ....................................................................

.................................................................................................

Email address ...........................................................................

1. How often do you visit our website?

Daily Weekly Monthly On need basis Never

2. What is/are your purpose(s) for visiting our website?

Products and services

Industries and applications

Training

Resources

Other (Please specify) ________________________________ _______________________________________________________

3. What don’t you like about our website? _____________________ _______________________________________________________ _______________________________________________________

4. What suggestions do you have for improving our site? ________ _______________________________________________________

5. How often are the steam traps on your site surveyed / maintained?

Less than every 2 years

Less than once per year

Never

6. Would you like a Spirax Sarco representative to contact you?

Yes, I would like to be contacted because __________________ __________________________________________________________

No, I would not like to be contacted because _______________ __________________________________________________________

TERMS AND CONDITIONS: Enter the competition by answering a few simple questions on an insert placed in our quarterly Topic publication. The competition starts 1st Oct 2010. Closing Date of the Competition is 1st Nov 2010. Date of the draw will be 2nd Nov 2010. Time will be 10.00am. Draw will take place at the Spirax Sarco Head Office at 14 Forge Street, BLACKTOWN NSW 2148. The total prize value is: $1,000.00. Main prize is the Apple iPad $640.00. Second Prize is a place in the next Spirax Sarco ‘Steam Engineering’ seminar when held in your state valued at $360.00. Winners’ names will be announced on the Spirax Sarco website on 13th Nov 2010 and published in the Issue 11 of Topics. All prize winners will be notified by phone call and mail from their local representative who will personally deliver the prize. Website address is: www.spiraxsarco.com/au in the News section. The Promoter is Spirax Sarco with registered office at 14 Forge Street Blacktown (PO Box 6308, Delivery Centre), NSW. ABN 52001 126 601. Redraw will be held on 9th Feb 2011. Redraw will be held at the same address and time as original draw. Prize winners will have their prizes delivered by our Spirax Sarco staff member for that sales territory and all prizes will be delivered before 27th Feb 2011. ACT residents excluded. NSW: LTPS/09/11288

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australian topics - spirax sarco€¦ · · 2014-10-16discussed the ph control of boiler water....

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