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

 



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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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