MARCET BOILER Engr Syed Waheed ul Hasan 5122009

MARCET BOILER Engr. Syed Waheed ul Hasan 5/12/2009 1

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 5/12/2009 2

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DESCRIPTION OF ASSEMBLY • PRESSURE VESSEL Capacity ------- 7 liters Material -------stainless steel 304 Operating Pressure-----10 bars Certification------ DOSH certified • PRESSURE GAUGE Type ------Bourdon Tube Range ------ 0 -20 bars (g) 5/12/2009 4

Description and Assembly • PRESSURE TRANSDUCERS Wetted material ------ stainless steel Case Material-------- stainless steel Range ----- 0 -16 bars (abs) • TEMPERATURE SENSOR Type RTD (class A) Range ----- 0 -200 o. C • SAFETY FEATURES PR valve (set at 15 bars), TC (set at 185 o. C) 5/12/2009 5

OBJECTIVE Our objective here is to collect PT (saturation data) by operating the boiler and compare that data with calculated one 5/12/2009 6

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 d. T/d. P • 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 5/12/2009 7

COLLECTING THE SATURATION DATA Pressure, P(bars) Gauge 5/12/2009 Increase Absolute (o. C) Temperature , T (o. C) Decrease average (o. C) Measured calculated slope average d. T/d. P (TVfg/hfg) Tavg (K) 8

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 5/12/2009 9

MATLAB • P=[1 1. 8 2. 6 3. 4 4. 8 6. 4 9. 5 • T=[373 390. 3 401. 9 411. 3 423. 6 434. 8 450. 8 5/12/2009 1. 1 1. 2 1. 9 2 2. 7 2. 8 3. 5 3. 6 5 5. 2 6. 6 6. 8 10]; 375. 4 378. 1 391. 9 393. 5 403. 3 404. 5 412. 4 413. 2 425. 1 426. 7 435. 9 437. 2 452. 9]; 1. 3 2. 1 2. 9 3. 8 5. 4 7 1. 4 2. 2 3 4 5. 6 7. 5 1. 5 2. 3 3. 1 4. 2 5. 8 8 1. 6 2. 4 3. 2 4. 4 6 8. 5 1. 7 2. 5 3. 3 4. 6 6. 2 9 380. 1 394. 8 405. 7 415 428. 1 438. 4 382. 6 396. 6 406. 8 416. 8 429. 7 440. 3 384. 5 398. 1 407. 8 418. 8 431 443. 8 386. 6 399. 3 408. 9 420. 3 432. 1 446. 3 388. 5 400. 7 410. 1 421. 9 433. 4 448. 6 10

• • TT=polyfit(P, T, 4) fit. Tvalues=polyval(TT, P) plot(P, fit. Tvalues) hold on plot(P, T) slope=polyder(TT) slopeval=polyval(slope, P) measured=slopeval. /100 5/12/2009 11

ASSIGNMENT to be submitted on 19 th 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 ok 5/12/2009 12

• Submit only one page with your roll numbers mentioned on back side. Don’t use title page. • Address the 4 question in your th practical notebook on the 9 page of the MARCET BOILER mannual Thank you 5/12/2009 13