ASME B16.48:2005 pdf download Line Blanks
1SCOPE
1.1 General
This Standard covers pressure-temperature ratingsmaterials, dimensions, tolerances, marking, and testingfor operating line blanks in sizes NPS through NPS 24for installation between ASME B16.5 flanges in the 150300，600，900,1500,and 2500 pressure classes.
1.2 Definitions
1.21 Figure-8 Blank. A figure-8 blank (also called aspectacle blank) is a pressure-retaining plate with onesolid end and one open end connected with a web ortie bar (see Fig. 1).
1.2.2 Paddle Blank. A paddle blank is similar to thesolid end of a figure-8 blank It has a plain radial handleIt is generally used in conjunction with a paddle spacerin large sizes.
1.2.3 Paddle Spacer, A paddle spacer is similar tothe open end of a figure-8 blank. It has a plain radialhandle It is generally used in conjunction with a paddleblank.
1.3 References
Codes, standards, and specifications, containing prowisions to the extent referenced herein, constituterequirements of this Standard. These reference documents are listed in Nonmandatory Appendix B
14 Quality Systems
Nonmandatory requirements relating to the productmanufacturer’s Quality System Program are describedin Nonmandatory Appendix C
1.5 Relevant Units
This Standard states values in both Metric andUS. Customary units. These systems of units are to beregarded separately as standard. Within the text, theUS.Customary units are shown in parenthesis or separate tables. Refer to Nonmandatory Appendix A. Thevalues stated in each svstem are not exact equivalentstherefore, it is required that each system of units be usedindependently of the other.Combining values from thetwo systems constitutes nonconformance with the Standard.Nonmandatory Appendix A provides dimensionsin U.S. Customary units.
1.6 Convention
For the purpose of determining conformance withthis Standard, the convention for fixing significant digits where limits and maximum and minimum values arespecified,shall be rounded as defined in ASTMPractice E 29. This requires that an observed or calcu-lated value shall be rounded off to the nearest unit inthe last right-hand digit used for expressing the limitDecimal values and tolerances do not imply a particularmethod of measurement.
1.7 Size
NPS, followed by a dimensionless number, is the des-ignation for nominal blank size. NPS is related to thereference nominal diameter, DN as defined in ISO 6708The relationship is typically as follows:
NOTE: For NPS 2 4, the related DN is DN = 25 (NPS)
1.8 Service Conditions
Criteria for selection of materials suitable for particu-lar fluid service are not wihtin the scope of this Standard
2 PRESSURE-TEMPERATURE RATINGS
2.1 Pressure Classes
Line blanks covered by this Standard are for the fol-lowing pressure classes: 150,300，600900,1500,and2500 as listed in ASME B16.5.
2.2 Pressure-Temperature Ratings
2.2.1 Ratings.Ratings are the maximum allowableworking gage pressure at the temperature shown inTables 2 and F-2 of ASME B16.5 for the appropriatematerial and pressure class. For intermediate tempera-tures, linear interpolation between temperatures withina pressure class is permitted by ASME B16.5.
2.2.2 System Pressure Testing. Line blanks may besubjected to system tests at a pressure not to exceed1.5 times the 38°C (100°F) rating rounded off to the nexthigher 1 bar (25 psi) increment. Testing at any higherpressure is the responsibility of the user, taking into