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It are the notes on the dimensions of the flanges used in the water supply system.
American Water Works Association AWWA = American Water Works Association, the association for water supply engineering in the United States
I’m not referring to AWWA; I’m asking how to translate these things in the picture.
Note: 1. The flange can be punched or reamed to accommodate a pipe with an outer diameter larger than the nominal diameter. This ensures that a sufficient inner diameter is retained after the cement mortar lining is applied. Sufficient space for the wrench must be reserved between the outer diameters of the pipes and around the bolts, and enough space also needs to be provided for the washer seats. 2. Unit conversion: Nominal pipe diameter in × 25.4 = mm ; Dimensions in×25.4=mm ; Psi×6.895=KPa ; The pressure rating at ambient temperature is 86Psi. These flanges have the same outer diameter and are drilled in accordance with Class 125 cast steel flanges (ASME B16.1). 24in or smaller flanges also match the drilling for ASME B16.5 150Psi grade steel flanges. Pressure rating at ambient temperature: Sizes 4–12 in, including 12 in, 175 Psi ; Size over 12in, 150Psi. These flanges have the same outer diameter and are drilled in accordance with Class 125 cast steel flanges (ASME B16.1). Flanges of 24 inches or less also meet the ASME B16.5 150Psi class steel flange standards. For nominal diameters of 26 inches and larger, the purchaser shall specify the flange inner diameter, Size B. The size of the flange hole should not exceed 0.25 in of the pipe’s outer diameter. The bolt hole drill is 1/8 inch. The portion with a diameter exceeding the nominal diameter of the bolt is not within the scope specified in section 4.2.3. 1. The loop flange is used for pipes; in the first section of the sleeve, the outer diameter of the pipe equals its nominal size, and no drilling should be done. 2. Unit conversion: Nominal pipe size: in × 25.4 = mm ; Dimensions in×25.4=mm ; Psi×6.895=KPa ; At ambient temperature, the pressure rating is 275 Psi; these flanges have the same dimensions and are cast steel flanges per ASME B16.1 Class 125. Flanges of 24 inches or less also meet the ASME B16.5 150Psi class steel flange standards. According to the purchaser’s requirements, welded neck flanges can be used if necessary. The bolt hole drill is 1/8 inch. The portion with a diameter exceeding the nominal diameter of the bolt is not within the scope specified in section 4.2.3. The thickness T of the flange from which the convex surface has been removed should not be less than dimension T minus 0.06 in.