ASME B16.20 pdf free download
ASME B16.20-2017 pdf free download.Metallic Gaskets for Pipe Flanges.
Ringjoint gaskets shall he either octagonal or oval in cross section.
RJ-2 SIZE
Ring-ioint gaskets shall be Identified by an R. RX. or HX number that relates to flange size (NPS), pressure class. and the appropriate flange standards (ASME B 16.5. ASME B16.47. API Specification 6A, or Iso 10423).
Ri-3 MATERIALS
RJ-3.1 General
Ring-)oint gasket materials, some of which are listed In Table RJ-3.2-1, shall be selected by the user based on suitability for the service conditions.
It is recommended that ring-joint gaskets be of a lesser hardness than that of the mating flanges.
RJ-3.2 Hardness
Kingjoint gaskets of materials listed in Table R-3.2-1 shall have a hardness equal to or less than that shown in Table RJ-3.2-1.
RJ-4 MARKING
The outer surface of each gasket shall carry the manufacrure?s name or identificanon trademark and gasket number prefixed by the letters R. RX, or HX, followed by the gasket material identificatiois. Materials shall be identified as shown in Table Kl4-I. The gasket shall also be marked with an ASME Bl&20 designation. The marking shall be applied so as not to harmfully distort the gasket or affect the tntegnty of the seal.
RJ-5 DIMENSIONS AND TOLERANCES
Dimensions and tolerances for ring.joint gaskets shall be as shown in Tables RI-S-I through 111-5-6.
RJ-6 SURFACE FiNISH
Types R and RX gaskets shall have a surface finish not rougher than 1.6 pm (63 pin.) roughness. Type BX gaskets shall have a surface finish not rougher than 0.8 pm (32 pin.) roughness. Surface finish shall pertain to the gasket-scalIng surface.
RJ-7 IDENTIFICATION NUMBER
Dimensional relerence Identification numbers are assigned to r1ng.olnt gaskets and shown In Tables RS-I through RI-S-6.ASME B16.20 pdf download.
