Mechanical Design of Process Equipments
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1 CH2357 Process Equipment Design I Mechanical Design of Process Equipments Dr. M. Subramanian Associate Professor Department of Chemical Engineering Sri Sivasubramaniya Nadar College of Engineering Kalavakkam , Kanchipuram(Dist) Tamil Nadu, India msubbu.in@gmail.com 21-Mar-2011
2 Syllabus Contents 1. Design and drawing considerations of bolt, nut and screws, welded and riveted joints, flanged joints, nozzles and reinforcements. Pipe fittings. 2. Design and drawing considerations of vessel supports such as bracket, saddle, skirt, etc. Storage Tanksfor solids, liquids and gases. 3. General designand drawing consideration of vessels subjected to internal pressure, and external pressure. High pressure vessels. 4. Fundamental principles, equations, general design and drawing considerations of cyclone separators centrifuges, thickeners and filtration equipments. 5. General design and drawing considerations of crystallizers, agitated vessel, jacketed and coil heated vessels. 21-Mar-2011 M Subramanian
3 Bolts & Nuts Specification: Mx (in units of millimeters) Preferred sizes: M Mar-2011 M Subramanian
4 21-Mar-2011 M Subramanian
5 21-Mar-2011 M Subramanian
6 Welded Joints 21-Mar-2011 M Subramanian
7 21-Mar-2011 M Subramanian
8 21-Mar-2011 M Subramanian
9 21-Mar-2011 M Subramanian
10 21-Mar-2011 M Subramanian
11 Riveted Joints 21-Mar-2011 M Subramanian
12 21-Mar-2011 M Subramanian
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14 21-Mar-2011 M Subramanian
15 Flanged Joints 21-Mar-2011 M Subramanian
16 21-Mar-2011 M Subramanian
17 21-Mar-2011 M Subramanian
18
19 Types of Flanges Slip-on raised face Welding neck Lap-joint Stub-end Screwed 21-Mar-2011 M Subramanian
20 21-Mar-2011 M Subramanian
21 21-Mar-2011 M Subramanian
22 Material of Construction Forgings, castings, plates Forged Steel such as ASTM A Mar-2011 M Subramanian
23 Slip-on Raised Face Flange 21-Mar-2011 M Subramanian
24 Welding Neck Flange 21-Mar-2011 M Subramanian
25 Socket Weld Flange 21-Mar-2011 M Subramanian
26 Lap joint 21-Mar-2011 M Subramanian
27 Screwed Flange 21-Mar-2011 M Subramanian
28 Blind flange 21-Mar-2011 M Subramanian
29 Standards Evolution ASA B16e, 1932 ASA B16.5, 1953, ANSI B16.5, 1973 ASME/ANSI B16.5, 1988 ASME B16.5, Mar-2011 M Subramanian
30 Rating of Flanges 150, 300, 600, 900, 1500, 2500 psig Pipe flanges and flanged fittings: NPS ½ through NPS Mar-2011 M Subramanian
31 21-Mar-2011 M Subramanian
32 21-Mar-2011 M Subramanian
33 Flange Facings Flat Facing (FF): Raised Facing (RF): The Raised face is the most common of all flange faces. The Raised face is named like this because the gasket surfaces are raised above the bolting circle face (the raised face is only a slight step). Raised face flanges are therefore not full contact flanges. As such, some flange stress may be created when the bolting is tightened. The raised face is finished with a series of concentric circular grooves for keeping the gasket in place and providing a better seal. Raised face flanges are specified for low, medium and high pressure-temperature applications. Ring type Joint Facing (RTJ) 21-Mar-2011 M Subramanian
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35 21-Mar-2011 M Subramanian
36 21-Mar-2011 M Subramanian
37 21-Mar-2011 M Subramanian
38 How to Order a Flange 21-Mar-2011 M Subramanian
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47 21-Mar-2011 M Subramanian
48 Dished Ends 21-Mar-2011 M Subramanian
49 21-Mar-2011 M Subramanian
50 21-Mar-2011 M Subramanian
51 21-Mar-2011 M Subramanian
52
53 21-Mar-2011 M Subramanian
54 The manufacturing of such an end is easier than that of a hemisphere. The starting material is first pressed to a radius r1 and then curled at the edge creating the second radius r2. Vessel dished ends can also be welded together from smaller pieces.
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57 21-Mar-2011 M Subramanian
58 Types of Ends Flanged Ellipsoidal Torispherical Hemispherical Conical Toriconical 21-Mar-2011 M Subramanian
59 Torispherical Hemispherical Ellipsoidal Flanged only 21-Mar-2011 M Subramanian
60 Conical Toriconical Reverse dished 21-Mar-2011 M Subramanian
61
62 Tori-spherical Ellipsoidal
63 Hemi-Spherical (Deep Drawn) Hemi-spherical (Segmental)
64 Diffuser Head
65 Dished Only Head Dished & Flared Head Flanged only
66 XY = ID/2 - r, OX = R - r Ø1 = Sin XY / OX, Ø2 = 90 - Ø1 Blank Plate Diameter (BPD) = 2 (L1+ L2+L1)
67 OD = outside diameter ID = inside diameter R = crown radius r = knuckle radius t = wall thickness SF = straight flange h = height of dished portion (straight flange not incl.) IH = total inside height
68 Drawing an Ellipse 21-Mar-2011 M Subramanian
69
70 Nozzles attachment to shell 21-Mar-2011 M Subramanian
71 Nozzle Reinforcement 21-Mar-2011 M Subramanian
72
73 Reinforcement of Openings Openings must be reinforced to account for metal removed. Metal used to replace that removed must be equivalent in metal area 21-Mar-2011 M Subramanian
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75
76 21-Mar-2011 M Subramanian
77 21-Mar-2011 M Subramanian
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79
80
81 Manhole with hinge support
82 Manhole with Davit
83
84 21-Mar-2011 M Subramanian
85 Supports to Process Vessels 21-Mar-2011 M Subramanian
86 Types of Supports Leg support Lug support Saddle support Skirt support
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88
89 Leg support Small vertical pressure vessel leg at the bottom of the shell. Ring reinforcement pad to provide additional reinforcement of local and load distribution, where the local stresses that occur The sum of the leg is needed depends on size and weight received vessel. Support leg is also commonly used in pressurized spherical storage vessels. 21-Mar-2011 M Subramanian
90 21-Mar-2011 M Subramanian
91 21-Mar-2011 M Subramanian
92 21-Mar-2011 M Subramanian
93 Spherical storage vessels typically supported on legs. Cross-bracing typically used to absorb wind and earthquake loads. 21-Mar-2011 M Subramanian
94 21-Mar-2011 M Subramanian
95 Lug Support Vessel size limits for lug supports: 1 10 ft diameter 2:1 to 5:1 height/diameter ratio Lugs bolted to horizontal structure. Bolt holes are often given the gap to provide radial thermal expansion of freedom in the vessel. 21-Mar-2011 M Subramanian
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97
98 Saddle Support 21-Mar-2011 M Subramanian
99 Saddle Support Saddle supports used for horizontal drums. Spreads load over shell. One support fixed, other slides. 21-Mar-2011 M Subramanian
100 21-Mar-2011 M Subramanian
101 21-Mar-2011 M Subramanian
102 21-Mar-2011 M Subramanian
103
104 Skirt Support 21-Mar-2011 M Subramanian
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106
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108 Skirt Support Skirt supports typically used for tall vertical vessels Designed for weight, wind, earthquake. Pressure not a factor. 21-Mar-2011 M Subramanian
109
110 Pressure Vessel Design ASME Section VIII is most widely used Code. Assures safe design. 21-Mar-2011 M Subramanian
111 Materials of Construction Plate Materials: Mild Steel: A-36, A-516 Gr 60, 70, Stainless Steel: 304, 316, 304L, 316L Pipe Materials A106, Forgings A105, 21-Mar-2011 M Subramanian
112 21-Mar-2011 M Subramanian
113 21-Mar-2011 M Subramanian
114 21-Mar-2011 M Subramanian
115 Thickness of Pressure Vessels 21-Mar-2011 M Subramanian
116 Design Pressure May have internal of external pressure, or both at different times. Must have margin between maximum operating pressure at top of vessel and design pressure. Hydrostatic pressure of operating liquid (if present) must be considered at corresponding vessel elevation. 21-Mar-2011 M Subramanian
117 Design Pressure For vessels under internal pressure, the design pressure is normally taken as the pressure at which the relief device is set. This will normally be 5 to 10 per cent above the normal working pressure, to avoid spurious operation during minor process upsets. Vessels subject to external pressure should be designed to resist the maximum differential pressure that is likely to occur in service. 21-Mar-2011 M Subramanian
118 Additional Loadings Loadings other than pressure and temperature: Weight of vessel and normal contents under operating or test conditions Superimposed static reactions from weight of attached items (e.g., motors, machinery, other vessels, piping, linings, insulation) Loads at attached internal components or vessel supports Wind, snow, seismic reactions 21-Mar-2011 M Subramanian
119 Joint Efficiency 1, 0.85, Mar-2011 M Subramanian
120 Corrosion Allowance The corrosion allowance must be added to the calculated thickness. 21-Mar-2011 M Subramanian
121 Design for External Pressure and Compressive Stresses Compressive forces caused by dead weight, wind, earthquake, internal vacuum Can cause elastic instability (buckling) Vessel must have adequate stiffness Extra thickness Circumferential stiffening rings 21-Mar-2011 M Subramanian
122 Stiffener Rings 21-Mar-2011 M Subramanian
123 Design for Internal Pressure Inside Diameter Design Pressure psig Design Temperature F Shell & Head Material - SA-516 Gr. 70 Corrosion Allowance in. 2:1 Semi-Elliptical heads, seamless 100% radiography Vessel in vapor service 21-Mar-2011 M Subramanian
124 Design as per codes 21-Mar-2011 M Subramanian
125 21-Mar-2011 M Subramanian
126 Design Codes Pressure Vessels: ASME Sec VIII, IS 2825 Storage Tank: API 650, IS Mar-2011 M Subramanian
127 21-Mar-2011 M Subramanian
128 21-Mar-2011 M Subramanian
129 21-Mar-2011 M Subramanian
130 21-Mar-2011 M Subramanian
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132 21-Mar-2011 M Subramanian
133 21-Mar-2011 M Subramanian
CH2404 Process Economics Unit V Economic Balance. Dr. M. Subramanian
CH2404 Process Economics Unit V www.msubbu.in Economic Balance www.msubbu.in Dr. M. Subramanian Associate Professor Department of Chemical Engineering Sri Sivasubramaniya Nadar College of Engineering Kalavakkam
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