When ordering flanges, the manufacturer must receive the following information:
1. Flange type (welding neck, slip-on, threaded, lap joint flange)
| Anchor Flange | Flat Face Flange | Orifice flange | Ring Joint Flange | Spigot Rings |
| Backing Flange | Flat Flange | Orifice Plate | Ring Sleeve | Split Flange |
| Blank Flange | Groove and Tongue Flange | Oval Plain Threaded Flange | Ring Spacer (Paddle Spacer) | Square Flange |
| Bleed Ring | High Hub Flange | Paddle Blank | Shaft Flange | Swivel Ring Flange |
| Blind Flange | Integral Flange | Plate Flanges | Shafts for Pump Flange | Tongue Groove Face Flange |
| Blind Tapped Flange | Lap Joint Flange Welding Neck Collar | Precison Flange | Slip On Flange | Treaded Flange |
| Compact Flange | Lap Joint Flange | Pubble Flange | Socket Weld Flange | Tube Sheet |
| Disc Plate Flange | Long Weld Neck Flange | Raise Face Flange | Spacer Ring | Weld Neck Flange |
| Expander Flange | Loose Plate Flange | Recess Flange | Spectacle Blind Flange | Weldoflange |
| Female and Male Flange | Nipoflange | Reduce Flange | Spade (Paddle Blanks Blind) | Types of Flanges |
2. Flange specification (example ASME B16.5, ASME B16.47 type A, EN 1092-1, JIS, UNI, DIN, etc.)
|
ANSI/ASME B16.47 Flanges |
ANSI/ASME B16.36 Flanges |
ANSI/ASME B16.5 Flanges |
Pr. EN1902-1 Flanges |
|
DIN Flanges |
JIS Flanges |
BS 4504 Flanges |
BS 10 Flanges |
|
MSS SP-44 Flanges |
JIS B2220 Flanges |
KS B1503 Flanges |
UNI Flanges |
|
SABS/SANS 1123 Flanges |
AS 2129, AS 4087 Flanges |
ISO 9624, ISO 7005-1 Flanges |
AWWA Flanges Standard |
|
GOST Standard Flanges |
API Flanges |
AS/ANZ 4331.1 Flanges |
Series A Flange |
|
Series B Flange |
SAE J518 Flanges |
GB Flange |
Norwegian Standard Flanges |
3. Nominal pipe size (NPS)
NPS to DN Conversion Chart
The table shows the conversion between NPS and the pipe outside diameter in inches, mm and DN (nominal diameter):
|
PIPE NPS |
Pipe outside diameter in inches |
PIpe outside diameter in mm |
NPS to DN conversion |
|
1/8 |
0.404 |
10.26 |
6 |
|
1/4 |
0.54 |
13.72 |
8 |
|
3/8 |
0.675 |
17.15 |
10 |
|
1/2 |
0.84 |
21.34 |
15 |
|
¾ |
1.05 |
26.67 |
20 |
|
1 |
1.315 |
33.40 |
25 |
|
1 ¼ |
1.66 |
42.16 |
32 |
|
1 ½ |
1.9 |
48.26 |
40 |
|
2 |
2.375 |
60.33 |
50 |
|
2 ½ |
2.875 |
73.03 |
65 |
|
3 |
3.5 |
88.90 |
80 |
|
3 ½ |
4 |
101.60 |
90 |
|
4 |
4.5 |
114.30 |
100 |
|
4 ½ |
5 |
127.00 |
115 |
|
5 |
5.563 |
141.30 |
125 |
|
6 |
6.625 |
168.28 |
150 |
|
7 |
7.625 |
193.68 |
— |
|
8 |
8.625 |
219.08 |
200 |
|
10 |
10.75 |
273.05 |
250 |
|
12 |
12.75 |
323.85 |
300 |
|
14 |
14 |
355.60 |
350 |
|
16 |
16 |
406.40 |
400 |
|
18 |
18 |
457.20 |
450 |
|
20 |
20 |
508.00 |
500 |
|
22 |
22 |
558.80 |
550 |
|
24 |
24 |
609.60 |
600 |
|
26 |
26 |
660.40 |
650 |
|
28 |
28 |
711.20 |
700 |
|
30 |
30 |
762.00 |
750 |
|
32 |
32 |
812.80 |
800 |
|
34 |
34 |
863.60 |
850 |
|
36 |
36 |
914.40 |
900 |
|
38 |
38 |
965.20 |
950 |
|
40 |
40 |
1016.00 |
1000 |
|
42 |
42 |
1066.80 |
1050 |
|
44 |
44 |
1117.60 |
1100 |
|
46 |
46 |
1168.40 |
1150 |
|
48 |
48 |
1219.20 |
120 |
4. Flange rating (or class): For ASME flanges, the rating can range from 150 to 2500; for JIS B2220 flanges and KS1503 flanges, the rating can range from 5k to 30k; for PN 6 to PN 100 for European and Russian-standard flanges (DIN, UNI, EN 1092-1, GOST 12820 / 12821-80); and for Class 600/3, 1000/3, 1600/3, 2 (South African standard for flanges)
5. Pipe schedule (for welding neck and socket weld flanges)
6. Flange facing type (FF; RF, RTJ): according to ASME B16.5, the raised face is the standard facing for flanges (different facings, like RTJ or flat face FF, have to be ordered specifically)
7. Flange surface finish (smooth, stock, concentric serrated, etc)
8. Material grade (forged carbon, stainless, duplex, nickel-alloy steels or, non-ferrous materials as cupronickel, copper, aluminum, and bronze)
