Instrumentation Tube Fittings
Aptek instrument tube fittings are used for leak proof, torque free seal in different instrumentation & process tubing connections. These products eliminate costly & hazardous leakages.
As shown in the figure the normal tube fitting is made of four parts. The parts are machined as per international standards to achieve the high quality. The frerrules are hardened & burnished for better swaging. The nuts are silver plated for preventing the seize up on the threads. The fitting consists of four parts but when it is fixed to the tube
As shown in the figure the normal tube fitting is made of four parts. The parts are machined as per international standards to achieve the high quality. The frerrules are hardened & burnished for better swaging. The nuts are silver plated for preventing the seize up on the threads. The fitting consists of four parts but when it is fixed to the tube
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Standard Specification
Materials : Aptek fittings are available in different materials as shown in the below mentioned table.
| Materials | Barstock | Forgings |
| Stainless Steel (316 & 304) | ASTM-A-276, ASTM-A-479, BS-970, DIN-4401 | ASTM-A-182, BS-970, DIN-4401 |
| Brass | ASTM-B-16, ASTM-B-453, BS-2874 | ASTM-B-124, BS-2872 |
| Steel Monel | ASTM-A-108, ASTM-B-164, BS-3076 | ASTM-A-576, ASTM-B-164, BS-3076 |
Pressure & Temperature rting for Instrumentation Table
| NPT / ISO Pipe Size IN. | 316 SS & Carbon Steel | |
| Male Threads (PSI) | Female Threads (PSI) | |
| 1/8” NPT | 9300 | 6000 |
| 1/4” NPT | 7300 | 6000 |
| 3/8” NPT | 7000 | 5000 |
| 1/2” NPT | 6900 | 4500 |
| 3/4” NPT | 6500 | 4200 |
| 1” NPT | 4800 | 4000 |
Maximum allowable working pressure for fractional size tubing (value in PSI) Table
| Tubing O.D. (inch) | Tubing wall thickness (inch) | |||||||||||
| -- | 0.010” | 0.012” | 0.016” | 0.020” | 0.028” | 0.035” | 0.049” | 0.065” | 0.083” | 0.095” | 0.109” | 0.120” |
| 1/16” | 6852 | 8395 | 11510 | 14395 | -- | -- | -- | -- | -- | -- | -- | -- |
| 1/8” | -- | -- | -- | 6843 | 9948 | 12622 | -- | -- | -- | -- | -- | -- |
| 3/16” | -- | -- | -- | 4345 | 6342 | 8145 | 11760 | -- | -- | -- | -- | -- |
| 1/4” | -- | -- | -- | -- | 4575 | 5910 | 8700 | 11773 | -- | -- | -- | -- |
| 3/8” | -- | -- | -- | -- | -- | 3770 | 5465 | 7520 | -- | -- | -- | -- |
| 1/2” | -- | -- | -- | -- | -- | 2770 | 3980 | 5415 | 7155 | -- | -- | -- |
| 5/8” | -- | -- | -- | -- | -- | -- | 3130 | 4240 | 5550 | 6480 | -- | -- |
| 3/4” | -- | -- | -- | -- | -- | -- | 2570 | 3490 | 4535 | 5270 | 6150 | -- |
| 7/8” | -- | -- | -- | -- | -- | -- | 2190 | 2948 | 3845 | 4443 | 5180 | -- |
| 1” | -- | -- | -- | -- | -- | -- | -- | 2568 | 3318 | 3843 | 4462 | 4970 |
Maximum allowable working pressure for metric size tubing (value in bar) Table
| Tubing O.D. (mm) | Tubing wall thickness (mm) | |||||||||||
| -- | 0.5 | 0.6 | 0.8 | 1 | 1.2 | 1.5 | 1.6 | 1.8 | 2 | 2.2 | 2.5 | 3 |
| 3 | 492 | 610 | 825 | 1030 | -- | -- | -- | -- | -- | -- | -- | -- |
| 6 | -- | -- | 382 | 495 | 603 | 775 | 909 | -- | -- | -- | -- | -- |
| 8 | -- | -- | 281 | 357 | 441 | 560 | 603 | -- | -- | -- | -- | -- |
| 10 | -- | -- | 220 | 278 | 342 | 438 | 471 | -- | -- | -- | -- | -- |
| 12 | -- | -- | 180 | 235 | 280 | 360 | 384 | 438 | -- | -- | -- | -- |
| 16 | -- | -- | -- | 170 | 203 | 259 | 278 | 315 | 360 | 398 | 458 | 561 |
| 18 | -- | -- | -- | 148 | 178 | 231 | 245 | 278 | 313 | 350 | 400 | 495 |
| 22 | -- | -- | -- | 121 | 145 | 186 | 201 | 223 | 250 | 278 | 320 | 392 |
| 25 | -- | -- | -- | 104 | 125 | 160 | 175 | 194 | 218 | 243 | 278 | 339 |
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