VS MALLEABLE IRON FITTINGS are designed to confirm with the following industry standards:
| MATERIAL: | ASTM A197 | Cupola Malleable Iron |
| ASTM A153 | Zinc Coatings | |
| DIMENSIONS: | ANSI/ASME B 16.3 | Malleable Iron Threaded Fittings |
| ASME B 16.14 | Ferrous Pipe Plugs, Bushings, etc. | |
| ASME B 16.39 | Malleable Iron Threaded Pipe Unions | |
| THREADS: | ANSV/ASME B1.20.1 | Pipe Threads. See data below. Threading. |
| MALLEABLE IRON - ANSI 8 16.3 | |||||
|---|---|---|---|---|---|
| Temperature | Class 150 psig | Class 300 psi² | |||
| DegreesC | Degrees F | Sizes 1/4 - 1 |
Sizes 1/4 - 2 |
Sizes 2 1/2 - 3 |
|
| -29 to 66 | -200 to 150 | 300 | 2000 | 1500 | 1000 |
| 93 | 200 | 265 | 1785 | 1350 | 910 |
| 121 | 250 | 225 | 1575 | 1200 | 825 |
| 149 | 300 | 185 | 1360 | 1050 | 735 |
| 177 | 366 | 150 ¹ | 1150 | 900 | 650 |
| 204 | 400 | 935 | 750 | 560 | |
| 232 | 450 | 725 | 600 | 475 | |
| 260 | 500 | 510 | 450 | 385 | |
| 333 | 550 | 300 | 300 | 300 | |
|
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| *All VS iron fittings are air pressure tested under water. | |||||
Class 300 Malleable Iron threaded fittings are marked with the numerals 300, the letters MI, and the size.
Class 150 Malleable Iron threaded fittings have no pressure class markings.
All fittings shall be threaded with American National Standard Pipe Threads (ANSI/ASME B1.20.1) and shall have taper threads, except wrought couplings and wrought caps in sizes 1/8, 1/4, 3/8 and 1/2, which may have straight threads.
The International System (SI) metric equivalent of British units are shown throughout this catalogue.
| NPS (Nominal Pipe Size) | =DN* (Nominal Diameter) |
| Operating Pressure Class | =PN* (Pressure Number) |
| 1 inch | =25.4 millimetres |
| 1 pound, weight | =0.4536 kilograms |
| 1 pound, pressure | =0.06895 bars |
| *From the SI designations, Diametre Nominal and Pression Nominale. | |
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