API-RP-576

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2 Normative References The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. • API 510, Pressure Vessel Inspection Code: In-service Inspection, Rating, Repair, and Alteration • API Standard 520 (All Parts), Sizing, Selection, and Installation of Pressure-relieving Devices in Refineries • API Standard 521, Pressure-relieving and Depressuring Systems • API Standard 526, Flanged Steel Pressure-relief Valves • API Standard 527, Seat Tightness of Pressure Relief Valves • API Recommended Practice 580, Risk-Based Inspection • API Recommended Practice 581, Risk-Based Inspection Technology • API Standard 620, Design and Construction of Large, Welded, Low-pressure Storage Tanks • API Standard 2000, Venting Atmospheric and Low-pressure Storage Tanks (Nonrefrigerated and Refrigerated) Fion Zhang/ Charlie Chong
• ASME PTC 25, Pressure Relief Devices • ASME Boiler and Pressure Vessel Code (BPVC), Section I: Power Boilers • ASME Boiler and Pressure Vessel Code (BPVC), Section IV: Heating Boilers • ASME Boiler and Pressure Vessel Code (BPVC), Section VI: Recommended Rules for the Care and Operation of Heating Boilers • ASME Boiler and Pressure Vessel Code (BPVC), Section VII: Recommended Guidelines for the Care of Power Boilers • ASME Boiler and Pressure Vessel Code (BPVC), Section VIII: Pressure Vessels; Division 1, Division 2 and Division 3 • ISO 4126-6, Safety devices for protection against excessive pressure—Part 6: Application, selection and installation of bursting disc safety devices • NACE MR 0175, Petroleum and Natural Gas Industries—Materials for Use in H 2 S- Containing Environments in Oil and Gas Production. • NACE MR 0103, Materials Resistant to Sulfide Stress Cracking in Corrosive Petroleum Refining Environments. • NB-18, Pressure-relief Device Certifications. • NB-23:2004, National Board Inspection Code. 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: 2 Normative References Fion Zhang/
Page 23 and 24: 3.1 General For the purposes of thi
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
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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
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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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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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