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Inspection Practices for Pressure V
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Contents 1 Scope. 2 Normative Refer
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10 Condition Assessment and Repair.
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2 Normative References The followin
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3 Terms and Definitions 3.1 Definit
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3.1.8 design temperature The temper
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3.1.18 maximum allowable working pr
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3.1.24 pressure vessel engineer One
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3.1.30 testing Within this document
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4 Introduction to Pressure Vessels
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4.1 General 4.2 Methods of Construc
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Columns, towers, drums, reactors, h
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Pressure vessels are designed in va
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4.2 Methods of Construction Prior t
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Fion Zhang/ Charlie Chong The cylin
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Fion Zhang/ Charlie Chong Hydrocrac
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4.3 Materials of Construction Carbo
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Tubesheets for exchanger bundles ar
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If carbon steel would not resist th
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Strip-lined Vessel Fion Zhang/ Char
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Fion Zhang/ Charlie Chong Overlay p
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Some pressure vessels have heat exc
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1. stationary head—channel cover
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Thermal / catalytic reactor Fion Zh
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Separator to separate gases Fion Zh
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Chemical treating unit Fion Zhang/
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Fion Zhang/ Charlie Chong Regenerat
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Figure 7—Vertical Heat Exchanger
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Figure 12—Exchangers Figure 10—
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4.6 Design and Construction Standar
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The ASME BPVC lists materials that
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A pressure vessel should be maintai
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- Page 91 and 92: Reasons for Inspection 5.1 General
- Page 93 and 94: 5.2 Safety One of the primary reaso
- Page 95 and 96: Internal company procedures regardi
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- Page 99 and 100: f. Safe accessibility of equipment
- Page 101 and 102: 6.2 Inspection for Specific Types o
- Page 103 and 104: Understanding factors and condition
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- Page 109 and 110: 7 Frequency and Extent of Inspectio
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- Page 115 and 116: d) An occasional check of the opera
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- Page 119 and 120: 8.1 Safety Precautions Safety preca
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- Page 125 and 126: n) tube gauges (inside diameter); o
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- Page 129 and 130: 9 Inspection Methods and Limitation
- Page 131 and 132: 9.1 General Before starting the ins
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- Page 141 and 142: 9.2.2 Limits of Thickness The limit
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- Page 147 and 148: 9.3 External Inspection 9.3.1 Gener
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- Page 157 and 158: 9.3.5 Concrete Supports Inspection
- Page 159 and 160: 9.3.6 Steel Supports Steel supports
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- Page 163 and 164: 9.3.7 Rivets Although uncommon, riv
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- Page 179 and 180: 9.3.13 External Metal Surfaces The
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API571 SECTION 4.0 GENERAL DAMAGE M
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Brittle Fracture Below DTBTT C, C-
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9.4 Internal Inspection 9.4.1 Gener
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9.4.2 Surface Preparation The degre
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9.4.3 Preliminary Visual Inspection
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Fractionation and distillation towe
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Figure 16—Corrosion in Channel Fi
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9.4.4 Inspection of Degradation 9.4
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9.4.4.1 Thinning and Pitting Thickn
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Fion Zhang/ Charlie Chong 9.4.4.2 C
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Vessels containing amines (absorber
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9.4.4.3 Erosion Erosion usually dif
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9.4.4.4 Blistering Areas directly a
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Figure 19 - Self-vented Hydrogen Bl
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9.4.5 Inspection of Components 9.4.
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9.4.5.2 Trays The general condition
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Fion Zhang/ Charlie Chong Figure 21
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9.4.5.5 Linings Heavy-wall hydropro
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9.4.6 Inspection of Nozzles When ac
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Small 1 in. × 2 in. (2.5 cm × 5.0
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Bulges and buckling often occur in
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Where a lining leaks, it should be
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9.4.8 Inspection of Nonmetallic Lin
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Considerable care should be exercis
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Some refractory-tile linings are hu
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Refractory linings may spall or cra
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9.5 Special Methods of Detecting Me
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Etching of small areas may sometime
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9.7 Testing Fion Zhang/ Charlie Cho
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9.7.2 Pressure and Vacuum Testing W
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Pressure testing consists of fillin
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When testing pneumatically, a UT le
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When conducting hydrostatic or pneu
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This test will not normally disting
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• Stationary Heat Exchanger with
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• AKT Type Heat Exchanger • Hor
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Frequently, a bundle will be tested
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When water is used to conduct a pre
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10 Condition Assessment and Repair
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10.2 Visual Inspection A visual ins
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Degradation may be determined to be
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10.4 Remaining Life Once the vessel
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10.5 Methods of Repair Although rep
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The defects requiring repair and th
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10.5.1 Welding Repairs 10.5.1.1 Gen
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If the remaining metal, after defec
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10.6 Repair of Supporting Vessel Eq
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11 Records and Reports 11.1 Records
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Field notes consist of notes and me
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These reports should include; • t
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Annex B (informative) Towers Fion Z
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Fractionating column Fion Zhang/ Ch
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Sieve trays Sieve trays are made fr
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One piece valve; This is the most c
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http://seperationtechnology.com/dis
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