API-RP-576

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3 Terms and Definitions Fion Zhang/ Charlie Chong
3.1 General For the purposes of this document, the following terms and definitions apply. 3.1.1 car seal A locking seal that when placed in position and closed, locks and must be cut or physically broken to be removed. 3.1.2 galling A condition whereby excessive friction between high spots results in localized welding with subsequent splitting and a further roughening of rubbing surfaces of one or both of two mating parts. Fion Zhang/ Charlie Chong
Page 1 and 2: API-RP-576 Inspection of Pressure-r
Page 3 and 4: Fion Zhang/ Charlie Chong Speaker:
Page 5 and 6: 5 Causes of Improper Performance 5.
Page 7 and 8: 1 Scope Fion Zhang/ Charlie Chong
Page 9 and 10: The recommendations in this publica
Page 11 and 12: This publication does not cover tra
Page 13 and 14: pressure-relief valves Fion Zhang/
Page 15 and 16: pilot-operated pressure-relief valv
Page 17 and 18: upture disks Fion Zhang/ Charlie Ch
Page 19 and 20: 2 Normative References Fion Zhang/
Page 21: • ASME PTC 25, Pressure Relief De
Page 25 and 26: galling Fion Zhang/ Charlie Chong
Page 27 and 28: 3.2 Dimensional Characteristics of
Page 29 and 30: inlet size outlet size Fion Zhang/
Page 31 and 32: Fion Zhang/ Charlie Chong huddling
Page 33 and 34: Fion Zhang/ Charlie Chong lift
Page 35 and 36: Basic Function of a Spring Loaded S
Page 37 and 38: Valve Closed. In a direct spring lo
Page 39 and 40: The pressure below the valve must i
Page 41 and 42: Fion Zhang/ Charlie Chong F p = p*A
Page 43 and 44: Functional Diagram. The following d
Page 45 and 46: 3.3 Operational Characteristics—S
Page 47 and 48: 3.3.3 maximum allowable working pre
Page 49 and 50: 3.3.4 maximum operating pressure Th
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Page 53 and 54: 3.4.5 burst-pressure tolerance The
Page 55 and 56: 3.4.10 marked burst pressure or rat
Page 57 and 58: 4 Pressure-relieving Devices Fion Z
Page 59 and 60: 4.2 Pressure-relief Valve Fion Zhna
Page 61 and 62: 4.3 Safety Valve. Fion Zhnag/ Charl
Page 63 and 64: 4.3.1 General. A safety valve is a
Page 65 and 66: 4.3.2 Applications A safety valve i
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Page 69 and 70: 4.4.1 General. A relief valve is a
Page 71 and 72: 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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Fion Zhnag/ Charlie Chong
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Conventional safety valves Fig. 9.2
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Types Mediums Limitations Safety-re
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4.7.3 Limitations Balanced safety-r
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Fion Zhnag/ Charlie Chong Fig. 9.2.
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Fion Zhnag/ Charlie Chong http://ww
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4.8 Pilot-operated Pressure-relief
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What is a Pilot operated safety val
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4.8 Pilot-operated Pressure-relief
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Figure 9—High-pressure Pilot-oper
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4.8.2 Applications Pilot-operated s
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4.9 Pressure- and/or Vacuum-vent Va
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4.9.1 General. • A pressure- and/
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Figure 7—Low-pressure Diaphragm-t
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Figure 10—Weight-loaded Pallet Ve
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Figure 11—Spring and Weight-loade
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5 Causes of Improper Performance Fi
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Fion Zhang/ Charlie Chong Figure 22
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Figure 25—Monel Rupture Disks Cor
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Fion Zhang/ Charlie Chong
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Fion Zhang/ Charlie Chong Figure 35
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5.1 Corrosion Fion Zhang/ Charlie C
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Corrosion is a basic cause of many
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http://www.valveworld.net/safetyequ
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Because there is metal-to-metal con
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Basic interferometry The interferen
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As light travels through the Optica
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Example: 1 a series of fringes indi
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Causes of damaged valve seats; 1. C
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Spring failures. 2 modes of failure
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Fion Zhang/ Charlie Chong The size
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Incorrect calibration of pressure g
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How to adjust a PSV The spring dete
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http://www.cicpro.com/products/safe
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The design of the shroud must be su
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Adjustment pin affect the character
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5.5 Plugging and Sticking Fion Zhan
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5.6 Misapplication of Materials Fio
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Typical ball valve material selecti
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5.7 Improper Location, History, or
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Fion Zhang/ Charlie Chong V-203
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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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