ASME Code Case 181

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2.0 Valve BonnetThe cover for the opening in the body is the bonnet, and it is the second mostimportant boundary of a pressure valve. Like valve bodies, bonnets are inmany designs and models available.A bonnet acts as a cover on the valve body, is cast or forged of the samematerial as the body. It is commonly connected to the body by a threaded,bolted, or welded joint. During manufacture of the valve, the internalcomponents, such as stem, disk etc., are put into the body and then thebonnet is attached to hold all parts together inside.In all cases, the attachment of the bonnet to the body is considered apressure boundary. This means that the weld joint or bolts that connect thebonnet to the body are pressure-retaining parts. Valve bonnets, although anecessity for most valves, represent a cause for concern. Bonnets cancomplicate the manufacture of valves, increase valve size, represent asignificant cost portion of valve cost, and are a source for potential leakage.Fion Zhang/ Charlie Chonghttp://www.wermac.org/valves/valves_general.html
5 Valve Certification and Retesting5.1 CERTIFICATE OF COMPLIANCEWhen specified by the purchaser, the valve manufacturer shall submit to thepurchaser a certificate of compliance as required in the purchase order.5.2 RE-TESTINGA completed valve does not require re-testing unless inspection by thepurchaser is specified in the purchase order.This re-testing may be waived by the purchaser’s inspector upon writtencertification by the manufacturer that he valve has been inspected, tested,and examined for conformance with the requirements of this standard.Painted valves need not have paint removed for re-testing.Stored valves shall be commercially cleaned before re-testing and beforeshipment.Fion Zhang/ Charlie Chong
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ASME Code Case on Use of Alternativ
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Charlie ChongB31 CASE 181-1CASES OF
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ASME B31.3344.6 Ultrasonic Examinat
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344.6.2 Acceptance Criteria. A line
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(c) The ultrasonic examination shal
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Charlie ChongThe qualification bloc
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T-434.1.2 Material.(a) Similar Meta
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Flaw size shall be no larger than t
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Charlie ChongGENERAL NOTES:(a)t = t
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Charlie ChongTABLE 2FLAW ACCEPTANCE
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Charlie Chong(d) The ultrasonic exa
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Charlie Chong(e) Data is recorded i
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(i) Data analysis and acceptance cr
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Charlie Chong(2) Geometric. Ultraso
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Charlie Chong(c) Alternatively, oth
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(b) Multiple Flaws(1) Discontinuous
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Charlie ChongFigure 3
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Charlie ChongFigure 5
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Charlie Chong(d) With the owner’s
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ASME B31.1- 346 RECORDS346.2 Respon
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Charlie ChongB31 Case 181-2Original
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344.6.2 Acceptance Criteria. A line
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Charlie Chong4) Examinationa)The in
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Charlie Chong5) Data RecordingData
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Charlie ChongStored valves shall be
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ASME Code Case 181

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