INST 262 (DCS and Fieldbus), section 2 Lab Automatically ...

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Question 10 “Wet” natural gas is mostly methane (CH4) mixed with significant amounts of heavier hydrocarbon species such as ethane (C2H6), propane (C3H8), butane (C4H10), and pentane (C5H12). A process for separating these heavier hydrocarbons from the chief component (methane) using compression and cooling is shown here: "Wet" natural gas (78% CH4) Filter M Compressor Cryogenic coolant loop PSV "Dry" natural gas (93% CH4) PIC 115 PG PT 115 Flash vessel LG LT 108 FIR 110 LIC 108 Liquid hydrocarbons Chilled gases enter the flash vessel, where methane rises and escapes in gaseous form, while all the other (heavier) hydrocarbon molecules condense into liquid and exit out the bottom. Suppose PT-115 is mis-calibrated, such that it falsely indicates a pressure lower than what is actually inside the flash vessel. How will this mis-calibration affect the control of flash vessel pressure? Will the operator be able to know anything is wrong by observing the DCS monitor screens for this process? Suggestions for Socratic discussion • Explain the purpose of the heat exchangers in this P&ID, especially the two exchanging heat between the incoming (compressed) gas and the products coming off the top and bottom of the flash vessel. • Identify and explain the purpose of the “PSV” valve in this diagram. file i03084 30 FT 110
Question 11 Digital single-loop process controllers are stand-alone units: they require no auxiliary hardware to perform their function. As such, they are equipped with analog-to-digital converters (ADC) and digital-toanalog converters (DAC) to interface directly with instruments via the traditional 4-20 mA standard. Many single-loop controllers also have discrete (on/off) inputs and outputs for interfacing with process switches and alarm circuits. Shown here is a typical example of a single-loop controller, front and back: Front view Back view SP 100 0 Out PV Displ Auto Man Config 0 100 L1 N Gnd Aout_1 Dout_1 Com Aout_2 Dout_3 Ain_1 Com Ain_2 Din_1 Din_2 Din_3 Com Dout_2 Com Distributed control systems (DCS) are quite different. These systems are designed to control hundreds or even thousands of loops. As such, they are made in a modular fashion so the users can add whatever types of input and output (I/O) capability they need. Identify the purpose of each type of I/O module listed here, as it might be applied in a DCS. What I’m looking for here is an educated guess from you, as it may be quite a challenge to actually research these specific I/O types for different distributed control systems: • AI 1-5 VDC • AI 4-20 mADC • AI 4-20 mADC w/ HART • AO 4-20 mA • AO w/ HART • DI 24VDC dry contact • DI 24VDC isolated • DI 120VAC isolated • DO 24VDC high side file i02426 31
Page 1 and 2: Lab INST 262 (DCS and Fieldbus), se
Page 3 and 4: STUDENT PERFORMANCE OBJECTIVES: •
Page 5 and 6: EVALUATION AND GRADING STANDARDS: (
Page 7 and 8: Summer quarter INST 230 -- 3 cr Mot
Page 9 and 10: General student expectations Your f
Page 11 and 12: General tool and supply list Wrench
Page 13 and 14: Lab In the lab portion of each cour
Page 15 and 16: General advice for successful learn
Page 17 and 18: • Metric prefixes • Yotta = 10
Page 19 and 20: Physical constants Speed of light i
Page 21 and 22: Question 1 Questions The following
Page 23 and 24: • For those who have studied thre
Page 25 and 26: Suggestions for Socratic discussion
Page 27 and 28: Question 7 Examine this page of pro
Page 29: Question 9 Identify the effects of
Page 33 and 34: Question 25 Read the “An Analogy
Page 35 and 36: Next, build a resistor network usin
Page 37 and 38: Question 29 An important part of pe
Page 39 and 40: Question 43 Identify the types of i
Page 41 and 42: Question 45 Read Fluke’s Transmit
Page 43 and 44: Your assignment - at minimum - is t
Page 45 and 46: Question 61 Suppose an electronic p
Page 47 and 48: Question 63 In this process, two ch
Page 49 and 50: Question 65 This single-loop contro
Page 51 and 52: Suggestions for Socratic discussion
Page 53 and 54: Question 68 Large electric power di
Page 55 and 56: Question 69 This control system mea
Page 57 and 58: Question 71 Question 72 Question 73
Page 59 and 60: Question 83 This pressure-control s
Page 61 and 62: Question 85 Suppose a voltmeter reg
Page 63 and 64: Question 87 A digital pressure tran
Page 65 and 66: Question 89 Shown here is a pair of
Page 67 and 68: Question 91 Lab Exercise Your task
Page 69 and 70: Water level control Fountain-style
Page 71 and 72: Lab Exercise - selecting components
Page 73 and 74: Lab Exercise - documenting the syst
Page 75 and 76: A crude closed-loop PID tuning proc
Page 77 and 78: Lab questions - (reviewed between i
Page 79 and 80: 79 Loop Diagram: Revised by: Date:
Page 81 and 82:
81 Loop Diagram: Furnace temperatur
Page 83 and 84:
83 file i00654 Loop Diagram: Sludge
Page 85 and 86:
Answer 1 Answer 2 Partial answers:
Page 87 and 88:
Answer 28 Answer 29 • Pressure ga
Page 89 and 90:
Answer 32 Answer 33 Answer 34 Answe
Page 91 and 92:
A span error would look something l
Page 93 and 94:
Answer 71 Answer 72 Answer 73 Answe
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INST 262 (DCS and Fieldbus), section 2 Lab Automatically ...

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