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♦ Symbols and abbreviated terms
| Ao | original cross-sectional area of the parallel length of a test specimen |
| CE | carbon equivalent |
| DN | nominal diameter |
| HIC | hydrogen-induced cracking |
| HV | Vickers hardness |
| ID | inside diameter |
| L | low-temperature service |
| LS | low-temperature sour service |
| MPS | manufacturing prodedure specufication |
| MT | magnetic particle testing |
| N | normal service |
| NDT | non-destructive testing |
| NPS | nominal pipe size |
| NS | normal sour service |
| PN | nominal pressure |
| PT | liquid penetrant testing |
| Rm | tensile strength |
| RTJ | ring type joint |
| S | sour service |
| SMTS | specified minimum tensile strength |
| SMYS | specified minimum yield strength |
| SSC | sulfide stress cracking |
| t | specified wall thickness at the welding ends for flanges |
| Tdmin | minimum design temperature |
| UT | ultrasonic testing |
♦ Flange designations
| Non-sour service | Sour service | ||
| Temperature,Tdmin °C | Flange designation | Temperature,Tdmin °C | Flange designation |
| ≥0 | N | ≥0 | NS |
| ＜0 | L | ＜0 | LS |
△ Flanges with a minimum design temperature lower than 0 °C shall demonstrate proven notch toughness in accordance with Clause 9.
△ Flanges intended for sour service shall be so specified by the purchaser and meet the applicable requirements of Clause 9.
♦ Pressure class and design
△ The flange shall be capable of withstanding an internal pressure equal to the working oressure at the temperature range required.Maximum pressures for the various pressure classes against temperature are shown in Table 2.
Maximum pressures as a function of temperature
|
Temperature °C |
PN | |||||||||||
| 20 | 50 | 100 | 150 | 250 | 420 | |||||||
| Class | ||||||||||||
| 150 | 300 | 600 | 900 | 1500 | 2500 | |||||||
| MPA | bar | MPA | bar | MPA | bar | MPA | bar | MPA | bar | MPA | bar | |
| -30 to 120 | 1.96 | 19.6 | 5.11 | 51.11 | 10.2 | 102 | 15.3 | 153 | 25.5 | 255 | 42.6 | 426 |
| 150 | 1.9 | 19 | 4.93 | 49.3 | 9.86 | 98.6 | 14.8 | 148 | 22.6 | 226 | 37.7 | 377 |
| 175 | 1.83 | 18.3 | 4.75 | 47.5 | 9.51 | 95.1 | 14.3 | 143 | 22.2 | 222 | 34.1 | 341 |
| 200 | 1.76 | 17.6 | 4.59 | 45.9 | 9.17 | 91.7 | 13.8 | 138 | 21.9 | 219 | 36.5 | 365 |
| 250 | 1.7 | 17 | 4.41 | 44.1 | 8.86 | 88.6 | 13.3 | 133 | 22.5 | 225 | 35.5 | 355 |
|
For any temperature below 30 °C,the rating shall be no greater than the rating shown for -30 °C. For intermediate temoeratures,linear interpilation should be used. Ratings of flanges for temperatures greater than those given shall be by agreement. |
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