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MARCET BOILER

Engr. Syed Waheed ul Hasan

5/12/2009

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MARCET BOILER

• Stainless steel pressure vessel• Safety relief valve• Temperature and pressure transducers• Water heater is protected from burn out

by setting the maximum operating temperature with a temperature controller

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DESCRIPTION OF ASSEMBLY

• PRESSURE VESSELCapacity ------- 7 litersMaterial -------stainless steel 304Operating Pressure----------10 barsCertification------------ DOSH certified• PRESSURE GAUGEType ------------Bourdon TubeRange ----------- 0-20 bars (g)5/12/2009

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Description and Assembly

• PRESSURE TRANSDUCERSWetted material ------------ stainless steelCase Material---------------- stainless steelRange ---------- 0-16 bars (abs)• TEMPERATURE SENSORType RTD (class A)Range ---------- 0-200 oC• SAFETY FEATURESPR valve (set at 15 bars), TC (set at 185 oC)5/12/2009

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OBJECTIVE

Our objective here is to collect PT (saturation data) by operating the boiler and compare that data with calculated one

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CALACULATION PROCEDURES• Obtain the TP saturation data from boiler• Plot this TP data(P on abscissa and T on ordinate)• Measure the slope of the plot at each pressure

reading.this gives dT/dP• Obtain the values of calculated slope by Clausius

Clapeyron equation Feeding it the values of Tsat Vfg and hfg from Steam table.

• Calculate the difference of these slopes which gives you the accuracy of of the Clausius Clapeyron equation and strenghtens your measured readings

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COLLECTING THE SATURATION DATA

Pressure,P(bars) Temperature ,T (oC) Measured slope dT/dP

calculated slope

(TVfg/hfg)

Gauge AbsoluteIncrease

(oC)Decrease

(oC)average

(oC)average Tavg (K)

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HOW TO MAKE IT SIMPLE…

• As it is a very hectic job to calculate slope of the graph at 50 points, it can be made easy by using a machine for that i.e. your PC will calculate it for u.

• All you need to do is to tell your machine what it has to do for u, i.e. communicate with your machine. It need a machine language and you can use one that suits you. Lets use MATLAB for that

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MATLAB• P=[1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 2.1

2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3 3.1 3.2 3.33.4 3.5 3.6 3.8 4 4.2 4.4 4.6 4.8 5 5.2 5.45.6 5.8 6 6.2 6.4 6.6 6.8 7 7.5 8 8.5 99.5 10];

• T=[373 375.4 378.1 380.1 382.6 384.5386.6 388.5 390.3 391.9 393.5 394.8396.6 398.1 399.3 400.7 401.9 403.3404.5 405.7 406.8 407.8 408.9 410.1411.3 412.4 413.2 415 416.8 418.8 420.3

421.9 423.6 425.1 426.7 428.1 429.7431 432.1 433.4 434.8 435.9 437.2

438.4 440.3 443.8 446.3 448.6 450.8452.9];

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• TT=polyfit(P,T,4)• fitTvalues=polyval(TT,P)• plot(P,fitTvalues)• hold on • plot(P,T)• slope=polyder(TT)• slopeval=polyval(slope,P)• measured=slopeval./1005/12/2009

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ASSIGNMENTto be submitted on 19th May

• What are pressure transducers,how they work? Group 1 ok

• What is RTD. Working principle,its types and reason for different types of RTD? 2 ok

• Comparison of RTD with a Thermocouple? 3 ok• What is Pressure relief valve, usage,

construction of one mounted on your lab boiler? Group 4

• Comparison of PRV with rupture disk? 5 ok• SS-304, reason for use.why not SS-316? 6 ok5/12/2009

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• Submit only one page with your roll numbers mentioned on back side. Don’t use title page.• Address the 4 question in your

practical notebook on the 9th page of the MARCET BOILER mannual

Thank you5/12/2009