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MSS SP-55-2011
- Quality Standard for Steel Castings for Valves, Flanges and Fittings and Other Piping Components - Visual Method for Evaluation of Surface Irregularities
- standard by Manufacturers Standardization Society, 10/01/2011
- Publisher: MSS
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1. SCOPE
1.1 This Standard Practice is intended to supplement the requirements of ASTMStandard Specifications A216/A216M, A217/A217M, A351/A351M, A352/A352M, A389/A389M, A487/A487M, and A744/A744M, and to provide a series of reference photographs typical of the various surface irregularities common to steel pressure castings and illustrations of generally acceptable and generally rejectable quality. Table 1 of Section 5 is provided to show MSS interpretation as to the relationship between this Standard Practice and the levels of surface quality illustrated by the comparators and the associated photographs of the Castings Technology International (CTI), "Comparators for the Definition of Surface Quality of Steel Castings".
1.2 For additional nondestructive examinations defining quality of steel castings, this Standard Practice may be supplemented by the following MSS Standard Practices: SP-53, "Magnetic Particle Examination Method"; SP-54, "Radiographic Examination Method"; SP-93, "Liquid Penetrant Examination Method"; SP-94, "Ultrasonic Examination Method"; and SP-112, "Visual and Tactile Method".
2. DEFINITION OF SURFACE QUALITY BY VISUAL INSPECTION
2.1 Twelve general types of surface irregularities are characterized in the collection (see Section 3) with five examples being included for each type. The two examples in each case shown to the left illustrate acceptable degrees of the particular type of irregularity. The three examples to the right are characterized as containing unacceptable defects.
2.2 It is recognized that problems may be encountered in evaluating surfaces of castings over a wide range of size and section thickness using the same set of standards. This guide attempts to minimize the size effect and is intended for general use for any 4 in. x 5 in. (100mm x 125mm) area.
3. REFERENCE PHOTOGRAPHS
3.1 A set of 60 reference photographs illustrating various casting surface irregularities, which can be observed by visual inspection, is included herewith (see Annex B). These photographs are actual size examples of gradations involving acceptable and non-acceptable irregularities. It is intended that irregularities less pronounced than those shown as non-acceptable shall be accepted under this guide.
3.2 Photographs included are of actual castings and may exhibit surface irregularities other than the type characterized in the heading. Each type of surface irregularity shall be judged only against the series of photographs identified with the type.
1.1 This Standard Practice is intended to supplement the requirements of ASTMStandard Specifications A216/A216M, A217/A217M, A351/A351M, A352/A352M, A389/A389M, A487/A487M, and A744/A744M, and to provide a series of reference photographs typical of the various surface irregularities common to steel pressure castings and illustrations of generally acceptable and generally rejectable quality. Table 1 of Section 5 is provided to show MSS interpretation as to the relationship between this Standard Practice and the levels of surface quality illustrated by the comparators and the associated photographs of the Castings Technology International (CTI), "Comparators for the Definition of Surface Quality of Steel Castings".
1.2 For additional nondestructive examinations defining quality of steel castings, this Standard Practice may be supplemented by the following MSS Standard Practices: SP-53, "Magnetic Particle Examination Method"; SP-54, "Radiographic Examination Method"; SP-93, "Liquid Penetrant Examination Method"; SP-94, "Ultrasonic Examination Method"; and SP-112, "Visual and Tactile Method".
2. DEFINITION OF SURFACE QUALITY BY VISUAL INSPECTION
2.1 Twelve general types of surface irregularities are characterized in the collection (see Section 3) with five examples being included for each type. The two examples in each case shown to the left illustrate acceptable degrees of the particular type of irregularity. The three examples to the right are characterized as containing unacceptable defects.
2.2 It is recognized that problems may be encountered in evaluating surfaces of castings over a wide range of size and section thickness using the same set of standards. This guide attempts to minimize the size effect and is intended for general use for any 4 in. x 5 in. (100mm x 125mm) area.
3. REFERENCE PHOTOGRAPHS
3.1 A set of 60 reference photographs illustrating various casting surface irregularities, which can be observed by visual inspection, is included herewith (see Annex B). These photographs are actual size examples of gradations involving acceptable and non-acceptable irregularities. It is intended that irregularities less pronounced than those shown as non-acceptable shall be accepted under this guide.
3.2 Photographs included are of actual castings and may exhibit surface irregularities other than the type characterized in the heading. Each type of surface irregularity shall be judged only against the series of photographs identified with the type.
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