API-RP-576

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4.7.1 General A balanced safety-relief valve is a direct spring-loaded pressure-relief valve that incorporates a bellows or other means for minimizing the effect of backpressure on the operational characteristics of the valve. Whether it is pressure tight on its downstream side depends on its design. See Figure 5 and Figure 6. 4.7.2 Applications Balanced safety-relief valves are normally used in refinery and petrochemical process industries that handle flammable, hot, or toxic material, where high backpressures are present at the valve discharge. This typically occurs where material from the valve is routed to a collection system. They are used: • in gas, vapor, steam, air, or liquid services; • in corrosive service to isolate the spring and the bonnet cavity of the valve from process material; • when the discharge from the valves is piped to remote locations. Fion Zhnag/ Charlie Chong
4.7.3 Limitations Balanced safety-relief valves should not be used: • on ASME BPVC Section I steam boiler drums or ASME BPVC Section I superheaters, and • as pressure control or bypass valves. Balanced type valves require vented bonnets. A bellows failure allows process media from the discharge side of the valve to discharge from the bonnet vent. Consider the nature of the process media (e.g. liquid/vapor, toxicity, and flammability) when evaluating the bonnet vent disposition. Bonnet vents are typically routed to a drain or atmosphere depending on the process media involved. Fion Zhnag/ 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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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
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Page 69 and 70: 4.4.1 General. A relief valve is a
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Page 93 and 94: 4.8 Pilot-operated Pressure-relief
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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
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Page 121 and 122: Figure 25—Monel Rupture Disks Cor
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Page 129 and 130: 5.1 Corrosion Fion Zhang/ Charlie C
Page 131 and 132: Corrosion is a basic cause of many
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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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