API-RP-576

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3.4 Operational Characteristics—Device Pressures 3.4.1 backpressure The pressure that exists at the outlet of a pressure-relief device as a result of the pressure in the discharge system. It is the sum of the superimposed and built-up backpressures. 3.4.2 blow-down The difference between the set pressure and the closing pressure of a pressure-relief valve, expressed as a percentage of the set pressure or in pressure units. 3.4.3 built-up backpressure The increase in pressure at the outlet of a pressure-relief device that develops as a result of flow after the pressure relief device opens. 3.4.4 burst pressure The burst pressure of a rupture disk at the specified temperature is the value of the upstream static pressure minus the value of the downstream static pressure just prior to when the disk bursts. When the downstream pressure is atmospheric, the burst pressure is the upstream static gauge pressure. Fion Zhang/ Charlie Chong
3.4.5 burst-pressure tolerance The variation around the marked burst pressure at the specified disk temperature in which a rupture disk will burst. 3.4.6 closing pressure The value of decreasing inlet static pressure at which the valve disc reestablishes contact with the seat or at which lift becomes zero, as determined by seeing, feeling or hearing. 3.4.7 cold differential test pressure CDTP The pressure at which a pressure-relief valve is adjusted to open on the test stand. The CDTP includes corrections for the service conditions of backpressure or temperatures or both. 3.4.8 leak-test pressure The specified inlet static pressure at which a seat leak test is performed. 3.4.9 manufacturing design range The pressure range at which the rupture disk shall be marked. Manufacturing design ranges are usually catalogued by the manufacturer as a percentage of the specified burst pressure. Catalogued manufacturing ranges may be modified by agreement between the user and the manufacturer. 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 and 22: • ASME PTC 25, Pressure Relief De
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
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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 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
Page 73 and 74: 4.6 Conventional Safety-relief Valv
Page 75 and 76: 4.6 Conventional Safety-relief Valv
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Page 81 and 82: Conventional safety valves Fig. 9.2
Page 83 and 84: Types Mediums Limitations Safety-re
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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
Page 97 and 98: 4.8 Pilot-operated Pressure-relief
Page 99 and 100: 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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Fion Zhnag/ Charlie Chong
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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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