Operating Instructions

Table Of Contents
Flat-Face flange dimensions
Flange size
a)
Flange class Flange O.D. Bolt hole circle
Ø
Bolt hole Ø No. of bolt holes Thickness
2" ASME 150 lb 6.0" 4.75" 0.75" 4 0.88"
3" ASME 150 lb 7.5" 6.0" 0.75" 4 0.96"
4" ASME 150 lb 9.0" 7.50" 0.75" 8 1.25"
2" ASME 300 lb 6.50" 5.00" 0.75" 8 1.12"
3" ASME 300 lb 8.25" 6.62" 0.88" 8 1.38"
4" ASME 300 lb 10.00" 7.88" 0.88" 8 1.50"
DN50 EN PN16 165 mm 125 mm 18 mm 4 24.4 mm
DN80 EN PN16 200 mm 160 mm 18 mm 8 31.8 mm
DN100 EN PN16 220 mm 180 mm 18 mm 8 31.8 mm
DN50 EN PN40 165 mm 125 mm 18 mm 4 25.4 mm
DN80 EN PN40 200 mm 160 mm 18 mm 8 31.8 mm
DN100 EN PN40 235 mm 190 mm 22 mm 8 38.1 mm
50A JIS 10K 155 mm 120 mm 19 mm 4 23.8 mm
80A JIS 10K 185 mm 150 mm 19 mm 8 24.4 mm
100A JIS 10K 210 mm 175 mm 19 mm 8 28.5 mm
a)
A 2" flange is designed to fit a 2" pipe: for actual flange dimensions see Flange O.D. Flange
markings located around the outside edge of the flat faced flange identify the flange assembly
on which the device is mounted.
Flat-Face flange markings
Flat Face Flange Identification Welded Assembly
Identification
Serial No. Logo Flange series Material Heat
code
Flange
series
Heat
code no.
Series Nominal size
MMDDYYXXX 25556 2 150 316L/ 1.4404 or
316L/ 1.4435
A1B2C3 25546 A1B2C3
DN80 PN16
Serial number: A unique number allotted to each flange, including the date of manufacture
(MMDDYY) followed by a number from 001 to 999 (indicating the sequential
unit produced).
Flange series: The Siemens Milltronics drawing identification.
Nominal size: The flange size followed by the hole pattern for a particular flange class. For
example:
A 2 inch ASME B16.5 150 lb class flange (North America)
A DN80 EN 1092-1 PN16 class flange (Europe)
Material: The basic flange material (AISI or EU material designation). North American
material codes are followed by European ones. For example, material desig‐
nation 316L/1.4404.
Heat code: A flange material batch code identification.
Dimension drawings
12.32 Flat-Face flange
SITRANS LR250 with mA/HART
218 Operating Instructions, 10/2019, A5E32220602-AG