Stainless Steel Instrumentation Tube

• Overview

  Control instrumentation and process measurement is a crucial part of most primary industries, including chemical processing, aerospace, medical equipment and shipbuilding, to name but a few. It covers components and devices ranging from pressure sensors and control valves to instrumentation tubes and level gauges. These fittings, valves and tubing are the veins and arteries through which the blood of the instrumentation system flows. From high-pressure tubing in your car’s fuel system to the heat exchangers used in nuclear power plants, instrumentation tubes are everywhere you look.

   

  Stainless steel is a preferred material for most kinds of instrumentation tubes as it is highly corrosion and heat resistant. It is also easy to weld and machine. 

• Materials

  316 Stainless steel – this has the strongest corrosion and pitting resistance of all the 300 series stainless steel grades. It is ideal for hydraulic and instrumentation tubes as it’s highly ductile.

  304 Stainless steel – This is one of the most commonly used stainless steel available. Also known as A2, it’s perfect for use in high-temperature environments or where corrosive acids are present.

  2205 Stainless steel – this is a high alloy stainless steel and is available in four groups: ferritic, martensitic, austenitic and precipitation-hardened. It has improved resistance to sulphide stress corrosion, and performs well in chloride environments.

  904L Stainless steel – this is also a high alloy stainless steel, but unlike 2205, it is a non-stabilised austenitic metal with a low carbon content. This non-magnetic alloy offers excellent resistance to stress corrosion cracking and crevice corrosion, and allows for a tighter tolerance to give a leak-proof joint between the connector and the tube.

• Specification

  SS Grades	304/304L, 304H, 316/316L, 316LN, 316H, 316Ti, 317L, 321, 310S, 2520, GH3030, GH3039
  Delivery Condition	Annealed and Pickled (AP), Polished, Bright Annealed (BA), MP, Cold Drawn, MF
  Standard	ASTM A269, ASTM A213, ASTM A270, DIN 2391, EN 10216-5 GB/T14976, GB/T13296
  Sizes	3.18 - 63mm
  Thickness	0.5 - 8mm
  Processing Service	Bending, Welding, Decoiling, Punching, Cutting, Moulding
  Technique	Cold drawn, Cold rolled, Hot rolled, Extrusion Tube
  Marking on instrumentation tubes	Size Grade / material Specification Heat number
  Types	Seamless / Welded Instrumentation tubes 316/ 316L stainless steel Heavy-Wall Annealed 316/ 316L stainless steel Cold-Drawn 1/8-Hard SS Jacketed Tubing and Insulated Tubing
  SS Instrumentation tubes Pressure Rating	15 000 psig (1034 bar)

• Maximum Working & Theoretical Bursting Pressures (PSI)

  O.D.  (Fraction)	O.D. (Decimal)	Nominal Tube Wall Thickness (Inches)
  		0.028	0.035	0.049	0.058	0.065	0.072	0.083	0.095	0.109	0.120
  1/8	0.125	6109	7636	10691
  		20160	25200	35280
  3/16	0.188	4062	5077	7108
  		13404	16755	23457
  1/4	0.250	3055	3818	5345	6327	7091
  		10080	12600	17640	20880	23400
  5/16	0.313	2440	3050	4270	5054	5664	6274	7232
  		8051	10064	14089	16677	18690	20703	23866
  3/8	0.375	2036	2545	3564	4218	4727	5236	6036	6909	7927	8727
  		6720	8400	11760	13920	15600	17280	19920	22800	26160	28800
  7/16	0.438	1743	2179	3051	3611	4047	4483	5168	5915	6787	7472
  		5753	7192	10068	11918	13356	14795	17055	19521	22397	24658
  1/2	0.500	1527	1909	2673	3164	3545	3927	4527	5182	5945	6545
  		5040	6300	8820	10440	11700	12960	14940	17100	19620	21600
  9/16	0.563	1356	1695	2374	2810	3149	3488	4021	4602	5280	5813
  		4476	5595	7833	9272	10391	11510	13268	15187	17425	19183
  5/8	0.625	1222	1527	2138	2531	2836	3142	3622	4145	4756	5236
  		4032	5040	7056	8352	9360	10368	11952	13680	15696	17280
  11/16	0.688	1110	1387	1942	2299	2577	2854	3290	3766	4321	4757
  		3663	4578	6410	7587	8503	9419	10858	12427	14259	15698
  3/4	0.750	1018	1273	1782	2109	2364	2618	3018	3455	3964	4364
  		3360	4200	5880	6960	7800	8640	9960	11400	13080	14400
  7/8	0.875	873	1091	1527	1808	2026	2244	2587	2961	3397	3740
  		2880	3600	5040	5966	6686	7406	8537	9771	11211	12343
  1	1.000	764	955	1336	1582	1773	1964	2264	2591	2973	3273
  		2520	3150	4410	5220	5850	6480	7470	8550	9810	10800
  1 1/8	1.125	679	848	1188	1406	1576	1745	2012	2303	2642	2909
  		2240	2800	3920	4640	5200	5760	6640	7600	8720	9600
  1 1/4	1.250	611	764	1069	1265	1418	1571	1811	2073	2378	2618
  		2016	2520	3528	4176	4680	5184	5976	6840	7848	8640
  1 1/2	1.500	509	636	891	1055	1182	1309	1509	1727	1982	2182
  		1680	2100	2940	3480	3900	4320	4980	5700	6540	7200
  1 3/4	1.750	436	545	764	904	1013	1122	1294	1481	1699	1870
  		1440	1800	2520	2983	3343	3703	4269	4886	5606	6171
  2	2.000	382	477	668	791	886	982	1132	1295	1486	1636
  		1260	1575	2205	2610	2925	3240	3735	4275	4905	5400

• Production Process

  Cold rolled, fine drawn.

• Heat Treatment and Surface Finish

  Vacuum bright annealing or protective bright annealing.

  Surface finish: mechanical polished 320-grit or 400-grit.

• Actual Dimensional Tolerances

  O.D: ± 0.0.5 mm; W.T: ± 10%; or upon request of purchaser.