API-RP-576

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• Acid attack on carbon steel due to a leaking valve seat • Acid attack on a stainless steel inlet nozzle • Chloride corrosion on a stainless steel nozzle • Sulphide corrosion on a carbon steel disc • Chloride corrosion on a stainless steel disc • Pitting corrosion on stainless steel bellows • Sour gas (H2S) attack on a monel rupture disc Fion Zhang/ Charlie Chong
Corrosion is a basic cause of many of the difficulties encountered with pressure-relief devices. Mitigations: • Material selections. • Using rupture disks at inlet and / or outlet. • Use of “O” ring to prevent leakages into moving parts. • Bellow seal of balanced pressure relieve valve. Fion Zhang/ Charlie Chong
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API-RP-576 Inspection of Pressure-r
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Fion Zhang/ Charlie Chong Speaker:
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5 Causes of Improper Performance 5.
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1 Scope Fion Zhang/ Charlie Chong
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The recommendations in this publica
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This publication does not cover tra
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pressure-relief valves Fion Zhang/
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pilot-operated pressure-relief valv
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upture disks Fion Zhang/ Charlie Ch
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2 Normative References Fion Zhang/
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• ASME PTC 25, Pressure Relief De
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3.1 General For the purposes of thi
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galling Fion Zhang/ Charlie Chong
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3.2 Dimensional Characteristics of
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inlet size outlet size Fion Zhang/
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Fion Zhang/ Charlie Chong huddling
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Fion Zhang/ Charlie Chong lift
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Basic Function of a Spring Loaded S
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Valve Closed. In a direct spring lo
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The pressure below the valve must i
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Fion Zhang/ Charlie Chong F p = p*A
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Functional Diagram. The following d
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3.3 Operational Characteristics—S
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3.3.3 maximum allowable working pre
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3.3.4 maximum operating pressure Th
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Fion Zhang/ Charlie Chong Keywords:
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3.4.5 burst-pressure tolerance The
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3.4.10 marked burst pressure or rat
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4 Pressure-relieving Devices Fion Z
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4.2 Pressure-relief Valve Fion Zhna
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4.3 Safety Valve. Fion Zhnag/ Charl
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4.3.1 General. A safety valve is a
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4.3.2 Applications A safety valve i
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4.4.1 General. A relief valve is a
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4.5 Safety-relief Valve. Fion Zhnag
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4.6 Conventional Safety-relief Valv
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4.6 Conventional Safety-relief Valv
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http://www.leser.com/en/products/do
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Page 85 and 86: 4.7.3 Limitations Balanced safety-r
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Page 93 and 94: 4.8 Pilot-operated Pressure-relief
Page 95 and 96: What is a Pilot operated safety val
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Page 99 and 100: Figure 9—High-pressure Pilot-oper
Page 103 and 104: 4.8.2 Applications Pilot-operated s
Page 105 and 106: 4.9 Pressure- and/or Vacuum-vent Va
Page 107 and 108: 4.9.1 General. • A pressure- and/
Page 109 and 110: Figure 7—Low-pressure Diaphragm-t
Page 111 and 112: Figure 10—Weight-loaded Pallet Ve
Page 113 and 114: Figure 11—Spring and Weight-loade
Page 117 and 118: 5 Causes of Improper Performance Fi
Page 119 and 120: Fion Zhang/ Charlie Chong Figure 22
Page 121 and 122: Figure 25—Monel Rupture Disks Cor
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Page 127 and 128: Fion Zhang/ Charlie Chong Figure 35
Page 129: 5.1 Corrosion Fion Zhang/ Charlie C
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Page 135 and 136: Because there is metal-to-metal con
Page 137 and 138: Basic interferometry The interferen
Page 139 and 140: As light travels through the Optica
Page 141 and 142: Example: 1 a series of fringes indi
Page 147 and 148: Causes of damaged valve seats; 1. C
Page 149 and 150: Spring failures. 2 modes of failure
Page 153 and 154: Fion Zhang/ Charlie Chong The size
Page 155 and 156: Incorrect calibration of pressure g
Page 157 and 158: How to adjust a PSV The spring dete
Page 159 and 160: http://www.cicpro.com/products/safe
Page 161 and 162: The design of the shroud must be su
Page 163 and 164: Adjustment pin affect the character
Page 167 and 168: 5.5 Plugging and Sticking Fion Zhan
Page 169 and 170: 5.6 Misapplication of Materials Fio
Page 171 and 172: Typical ball valve material selecti
Page 177 and 178: 5.7 Improper Location, History, or
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Fion Zhang/ Charlie Chong
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Rough handling can occur during;
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The following table summarises the
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Greater differentials between opera
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5.10 Improper Discharge Piping Test
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Fion Zhang/ Charlie Chong When hydr
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Fion Zhang/ Charlie Chong the bello
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5.11 Improper Handling, Installatio
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Rupture disk problems are often ass
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6.1 Reasons for Inspection and Test
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6.2.2 Safety 1. proper authority an
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National Board approved ASME stamps
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The Kdr or aW value can vary accord
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6.2.5 Removal of Device from System
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Exercise; Dismantling of PSV Fion Z
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Highly Reactive Materials Water-Rea
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6.2.7 Inspection of Adjacent Inlet
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Fion Zhang/ Charlie Chong Rupture d
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6.2.10 Visual Inspection This inspe
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6.2.11 Dismantling of Valve. Disman
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Portable Test Separator Internal &
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The pilot assembly and dome area co
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6.2.13 Reconditioning and Replaceme
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Fion Zhang/ Charlie Chong Most test
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After the valve has been adjusted,
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Check for leakage during pressuriza
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6.2.17 Completion of Necessary Reco
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when a valve operates in nonfouling
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ASME BPVC Section I requires; • B
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6.2.20 Inspection, Testing, Mainten
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6.2.21 Inspection, Testing, Mainten
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6.3 Visual On-stream Inspection Vis
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6.4.2 Frequency of Shop Inspection/
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Manufacturer’s Basis • Manufact
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API572, 6.4.3 Frequency of Visual O
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Routine • inspection least interf
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7.1 Objective The primary objective
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7.3 Responsibilities Some companies
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Annex A (informative) Pressure-reli
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API576 Charlie Chong/ Fion Zhang/ H
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A.1 Need and Function of Test Block
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A.2 Testing with Air • Air is com
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A.4 Description of Test Block The s
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Key 1. test station 2. adaptor for
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API-RP-576

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