Connections of selected devices, connectors of impulse lines produced by Rosservice. Impulse Tubing Recommendations Stainless Steel Fittings

Compression fittings are supplied from various materials for use in industries such as:

Shipbuilding
Oil and gas
Oil and gas platforms
Chemistry and petrochemistry
Oil refining
Analytical systems
Power plants
Metallurgy
Alternative views fuel
Pharmaceuticals
Diesel engines

Material Standards

D*	Material	ASTM standard
D*	Material	Bar material	Forgings
SS	Stainless steel	A479, A276 Type 316/316L JIS G4303 SUS316	A182 F316/F316L JIS G 3214 SUS F316
C	Carbon steel	A108 JIS G4051 S20C-S53C	A105 JIS G4051 S20C-S53C
B	Brass	B16, B453 C35300 JIS H3250 C3604, C3771	B283 Alloy 37700 JIS H3250 C3771
6MO	6Mo (06ХН28МДТ)	A276 S31254	A182 Grade F44 S31254
L20	Alloy 20	B473 N08020	B462 N08020
L400	Monel 400	B164 N04400	B564 N04400
L600	Alloy 600	B166 N06600	B564 N06600
L625	Alloy 625	B446 N06625	B564 N06625
L825	Alloy 825	B425 N08825	B564 N08825
C276	Hastelloy 276	B574 N10276	B564 N10276
D	Duplex SAF 2205TM	A276 S31803 A479 S31803	A182 F51
SD	Super duplex SAF 2507TM	A479 S32750	A182 F51
TI4	Titanium Gr.4	B348 Gr. 4	B381 F-4
Al	Aluminum	B211 Alloy 2024T6 JIS H4040 A2024, A6061	B247
T.E.	PTFE	D1710	D3294

D*: Material designation

Stainless steel fittings

Fittings larger than 25mm (1 inch) are supplied with Teflon coated ferrules (PFA). For systems with operating temperatures greater than 232°C (450°F), silver-plated front rings and uncoated rear rings are available.

Carbon Steel Fittings

Carbon steel fittings are supplied galvanized and the back rings are made from them. stainless steel brand 316.

Lubricant for nuts

On all stainless steel fittings, the threads on the nuts are silver plated, which reduces the tightening force and eliminates the effect cold welding and snacking.

Outstanding quality

Compression fittings have outstanding performance in harsh environments such as high and low temperature systems, vibration, pressure surges, etc.

Rolled external threads.
The rings are made from the company's materials. Carpenter.TM
The mechanical characteristics of the rings make it possible to crimp tubes with high rigidity.
A specially processed rear ring allows you to increase the number of connections and increase their reliability.
The number of assemblies/disassemblies is significantly higher than that of competitors.
Absolute tightness with any media, including small molecular gases.
The operating pressure is 4 times the tube pressure.
Hit code on all fittings.

High pressure gas systems

To move gas through the tubes, its pressure is increased. Also used high blood pressure when pumping cylinders and containers with it. Pressure above 34.5 bar is considered high. Compression fittings show excellent performance when working with high pressure gases.

Selection of impulse tubes for gas systems

Use thicker walled tubes for gas systems. In Table 8, gas tubes are shown in light cells. Thin-walled tubes are marked with gray cells to make them easy to identify. Gases such as air, oxygen, helium, nitrogen, methane, propane, and others have very small molecules, which allows them to penetrate through thin-walled tubes. Thick-walled tubes are also less sensitive to the effects of crimp rings, while thin-walled tubes can be deformed under the influence of crimp rings.

Application in vacuum systems

Application in cryogenic systems

HSME stainless steel compression fittings are able to maintain their seal at temperatures down to -200°C.

Assembling and Disassembling Compression Fittings

The outstanding mechanical parameters of HSME compression fittings provide maximum quantity assembling/disassembling connections.

Leaks

If the installation instructions are followed, HSME fittings provide a completely sealed connection.

Metric Tube Fittings

Metric fittings visually differ from inch ones by the presence of special protrusions on the fitting body, as well as on the nut.

Cleaning

All fittings are cleaned of external contaminants, as well as small metal particles, oil, and cutting fluids. Products for use in oxygen systems can be cleaned upon request. Cleaning is carried out according to ASTM G93 Level C.

Selecting an impulse tube

Correct selection of the tube, proper transportation and storage of the tube is the key to a reliable and sealed system.

Tube surface

The surface of the tube must be free of burrs, scratches and other damage.

Tube stiffness

The tube must be completely annealed.
The tube must be suitable for bending.

Ovality

The tube should be round and fit easily into the fitting.

Welded Tubing

The welded tube should not have protruding seams.

Tube wall thickness

The wall thickness must correspond to the operating pressure of the system. Impulse tubing suitable for use with compression fittings is shown in Table 8. Impulse tubing for use in gas systems must be selected from light cells. Tubes with wall thicknesses not shown in the table are not recommended for use with compression fittings.

Transporting the impulse tube

Impulse tubes must be transported very carefully to avoid damage.

Do not pull the tube out of tubes or racks.
Do not drag the tube.

Tube cutting

Choose a suitable pipe cutter wrong choice may damage the tube.
Cut carefully so as not to crush the tube.
The saw blade should have a minimum of 32 teeth per inch.
After cutting, the end of the tube must be processed with a trimmer.

Threaded standards

The table below shows the standards for threaded connections that are used on HSME fittings.

D*: Thread designation E*: Swagelok equivalent

Working pressure

Working pressure of compression fittings

The working pressure of the compression fittings is determined by the working pressure impulse tube.

Working pressure of threaded connections

When there is a threaded connection on the fitting, then working pressure may be limited by the operating pressure of the threaded connection.

Operating pressures are based on ASME B31.3 at room temperature.

Tapered thread – N and R

Size, inch	Stainless steel steel and carbon. steel				Brass
	Ext.		Int.		Ext.		Int.
	psi	Bar	psi	Bar	psi	Bar	psi	Bar
1/16	14,000	965	6,600	455	7,400	510	3,300	227
1/8	10,000	689	6,400	441	5,000	345	3,200	220
1/4	8,300	572	6,500	448	4,100	282	3,200	220
3/8	8,000	551	5,200	358	4,000	275	2,600	179
1/2	7,800	537	4,800	331	3,900	269	2,400	165
3/4	7,500	517	4,600	317	3,700	255	2,300	158
1	5,300	365	4,400	303	2,600	179	2,200	152
1-1/4	6,200	427	5,000	345	3,100	214	2,500	172
1-1/2	5,100	351	4,500	310	2,500	172	2,200	152
2	4,000	276	3,900	269	2,000	138	1,900	131

Straight thread – G and GB

Size	Stainless steel and carbon. steel
	Ext.
	psi	Bar
S	20ksi
1/8	16000	1103
1/4	12500	861
3/8	12000	827
1/2	11900	820
3/4	8000	551
1	5600	386
1 1/4	5400	372
1 1/2	5100	351

Straight thread SAE UF and UP

SAE thread size		Stainless and carbon steel
		Non-rotating "UF"		Rotating "UP"
		psi	Bar	psi	Bar
2	5/16-24	4568	315	4568	315
4	7/16-20
6	9/16-18			3626	250
8	3/4-160
10	7/8-14	3626	250	2900	200
12	1 1/16-12
14	1 3/16-12	2900	200	2320	160
16	1 5/16-12
20	1 5/8-12	2320	160	1813	125
24	1 7/8-12
32	2 1/2-12	1813	125	1450	100

Pressures are shown on SAE J1926/3 threads at room temperature.

Rotating ISO/BSPP Parallel Thread – GR

SAE J514 37° AN thread

Tube diameter		Stainless steel and carbon steel
Tube diameter		SAE J514 Table 1.
Metric, mm	Inch	PSI	Bar
2	1/8	5000	344
6	1/4	5000	344
8	5/16	5000	344
10	3/8	4000	275
12	1/2	3000	206
16	5/8	3000	206
20	3/4	2500	172
25	1	2000	137
32	1 1/4	1150	79.2
38	1 1/2	1000	68.9
50	2	1000	68.9

Pressures taken from SAE J514 standard.

Butt weld ends – BW

Nominal tube size	Stainless and Carbon Steel
	Butt Weld End
	PSI	Bar
S value	20 ksi
1/8	5300	365
1/4	5200	358
3/8	4400	303
1/2	4100	282
3/4	3200	220
1	3100	213
1 1/4	3000	206
1 1/2	2900	199
2	1900	131

Pressures are indicated at room temperature.

Socket welding - SW

Pressures shown are for a welded joint.

Fittings with “NO” and “UO” seals

Stainless steel and Carbon Steel “NO” & “UO” Threads up to 1” are rated at 206 bar at room temperature.

Translation table

Bar	MPa	PSI
1	0,1	14.5
100	10	1450
160	16	2321
210	21	3045
315	31.5	4569
350	35	5075
400	40	5801
413.68	41.36	6000

Operating temperature

When the thread is mounted with an O-ring, the O-ring may restrict operating temperature fitting. Fittings made of brass and carbon steel are equipped with FKM rings with a hardness of 70 Shore, and stainless steel with FKM rings with a hardness of 90 Shore.

O-ring operating temperature

Fitting and tube materials

Pick up the right combination materials for fittings and tubes for constructing sealed systems. Using the wrong materials may cause the system to leak.

Table 1. Inch seamless stainless steel tube

Fully annealed 316/316L, 304/304L stainless steel tube to ASTM A269 or A213 suitable for bending and rolling. Hardness 90 Vickers or less.

Diameter	Wall Thickness (inch)
tubes,	0.012	0.014	0.016	0.02	0.028	0.035	0.049	0.065	0.083	0.095	0.109	0.12	0.134	0.156	0.188
inch
1/16	6800	8100	9400	12000
1/8					8500	10900
3/16					5400	7000	10200
1/4					4000	5100	7500	10200
5/16						4000	5800	8000
3/8						3300	4800	6500	8600
1/2						2600	3700	5100	6700
5/8							2900	4000	5200	6000
3/4							2400	3300	4200	4900	5800	6400
7/8							2000	2800	3600	4200	4800	5400	6100
1								2400	3100	3600	4200	4700	5300	6200
1 1/4									2400	2800	3300	3600	4100	4900
1 1/2										2300	2700	3000	3400	4000	4900
2											2000	2200	2500	2900	3600

Table 2. Metric Seamless Stainless Steel Tube

Diameter								Wall thickness, (mm)
tubes,	0.6	0.8	1.0	1.2	1.5	1.8		2.0	2.2	2.5	2.8	3.0	3.5	4.0	4.5	5.0
in							Working pressure, (bar)
2	780	1050
3	516	710
4	520	660
6		330	420	520	670
8			310	380	490
10			240	300	380
12			200	240	310	380		430
14			180	220	280	340		390	430
15			170	200	260	320		360	400
16				190	240	300		330	370
18				170	210	260		290	320	370
20				150	190	230		260	290	330	380
22				130	170	210		230	260	300	340
25						180		200	230	260	300	320
28								180	200	230	260	300	320
30								170	190	210	240	260	310
32								160	170	200	230	240	290	330
38									140	170	190	200	240	280	310
42											170	180	210	250	280
50												150	180	200	230	260

In accordance with the requirements of ASME B31.3, pressures are calculated at temperatures from -28 to 37 °C and a maximum allowable stress of 1378 bar.

According to ASTM A269 standard, maximum permissible deviations in tube diameter: +/-
13

mm
(+/- 0.005 inch) deviation maximum: +/- 15%

The safety factor for the tube is 3.75.

Welded stainless steel tubes

According to the ASME B31.3 standard, reduction factors for working pressure are used for welded tubes. For tubes with one seam it is 0.80, for tubes with two welded seams it is equal to 0.85.

Table 3. Inch Seamless Carbon Steel Tubing

Annealed carbon steel tubes per ASTM A179. The tubes must be suitable for bending and must not have deep scratches or damage. Vickers hardness 72 or less.

Tube diameter, inch	Wall thickness, (inch)
	0.028	0.035	0.049	0.065	0.083	0.095	0.109	0.12	0.134	0.148	0.165	0.18	0.22
	Working Pressure (psi)
1/8	8000	10200
3/16	5100	6600	9600
1/4	3700	4800	7000	9600
5/16		3800	5500	7600
3/8		3100	4500	6200
1/2		2300	3300	4500	5900
5/8		1800	2600	3500	4600	5300
3/4			2100	2900	3700	4300	5100
7/8			1800	2400	3200	3700	4300
1			1500	2100	2700	3200	3700	4100
1 1/4				1600	2100	2500	2900	3200	3600	4000	4600	5000
1 1/2					1800	2000	2400	2600	3000	3300	3700	4100	5100
2						1500	1700	1900	2200	2400	2700	3000	3700

Table 4. Metric Seamless Carbon Steel Tubing.

Tube diameter, mm	Wall thickness, (mm)
	0.8	1	1.2	1.5	1.8	2	2.2	2.5	2.8	3	3.5	4	4.5
	Working pressure, (bar)
3	670	830
6	310	400	490	630
8		290	360	460
10		230	280	360
12		190	230	290	360	410	450
14		160	190	250	300	340	380
15		150	180	230	280	320	350
16			170	210	260	290	330	380
18			150	190	230	260	290	330
20			130	170	200	230	250	290	330
22			120	150	180	210	230	260	300
25					160	180	200	230	260	280
28						160	180	200	230	250	290
30						150	160	190	210	230	270
32						140	150	170	200	210	250	290
38							130	140	160	180	210	240	280

The operating pressure of the tube is calculated according to ASME A179 standard and is calculated at temperatures from -28 to 37 °C.

The pressure safety factor is 3.

To determine the tube pressure at high temperatures multiply it by 0.85.

Table 5. Inch seamless copper tube

Annealed copper tubing to ASTM B75 standard. The tubes must be suitable for bending and flaring, and must not be damaged or deep scratched. Vickers hardness 60 or less.

Tube diameter, inch	Wall thickness, (inch)
	0.01	0.012	0.028	0.035	0.049	0.065	0.083	0.095	0.109	0.12	0.134

1/8			2700	3600
3/16			1800	2300	3400
1/4			1300	1600	2500	3500
5/16				1300	1900	2700
3/8				1000	1600	2200
1/2				800	1100	1600	2100
5/8					900	1200	1600	1900
3/4					700	1000	1300	1500	1800
7/8					600	800	1100	1300	1500
1					500	700	900	1100	1300	1500
1 1/8						600	800	1000	1100	1300	1400

Table 6. Metric Seamless Copper Tubing

Tube diameter, mm	Wall thickness, (mm)
	0.7	0.8	1.0	1.2	1.5	1.6	1.8	2.0	2.2	2.5	2.8	3.0
	Working pressure, (bar)
3	220	250
4	160	190	240	290
6		120	150	190	240	260
8		80	110	130	170	190
10		70	80	100	130	150	170	190
12		50	70	80	110	120	130	150
14			60	70	90	100	110	130	140	170	190	200
16			50	60	80	80	100	110	120	140	160	180
18			40	50	70	70	80	100	110	120	140	150
22			30	40	50	60	70	80	80	100	110	120
25			30	40	50	50	60	70	70	80	100	100
28							50	60	60	70	80	90

The operating pressure of the tube is calculated according to ASME B75 and B88 standard and is calculated at temperatures from -28 to 37 °C.

400 Alloy Tube (Monel)

Annealed seamless tubing to ASTM B165. The tube must be suitable for bending, and there must be no damage or deep scratches on it. Vickers hardness 75 or less. Diameter tolerances: +/- 0.13 mm.

Table 7. Alloy 400 Inch Seamless Tubing

Tube diameter, inch	Wall thickness, (inch)
	0.028	0.035	0.049	0.065	0.083	0.095	0.109	0.12
	Working pressure (psi)
1/8	7900	10200
1/4	3700	4800	7000	9600
3/8		3100	4400	6100
1/2		2300	3300	4400
3/4			2200	3000	4000	4600
1				2200	2900	3400	3900	4300

Table 8. Alloy 400 Metric Seamless Tubing

Diameter OD mm	Wall thickness, (mm)
	0.8	1.0	1.2	1.5	1.8	2.0	2.2	2.5	2.8	3.0
	Working pressure, (Bar)
6	370	480	590	750
8		350	430	550
10		270	330	430
12		220	270	350
14		190	230	290	360
18			170	220	270	310	340
20				200	240	270	300	350
25					170	210	240	270	310	330

The operating pressure of the tube is calculated according to ASME B165 standard and is calculated at temperatures from -28 to 37 °C.
The pressure safety factor is 3.7.

C276 alloy tube

Annealed alloy C276 tube per ASTM B622. The tube must be suitable for bending and must not have deep scratches. Vickers hardness 100 or less. Diameter tolerances: +/- 0.13 mm.

Table 9. Alloy C276 Metric Tube

Tube diameter, inch	Wall thickness, (inch)
	0.020	0.028	0.035	0.049	0.065	0.083

1/8	8,200	12,000	15,300
3/16	5,300	7,700	9,900	14,400
1/4		5,600	7,200	10,600	14,400
5/16			5,700	8,200	11,300
3/8			4,700	6,700	9,200
1/2			3,400	4,900	6,700	8,800

Table 10. Metric Alloy C276 Tube

Tube diameter, mm	Wall thickness, (mm)
	0.8	1.0	1.2	1.5	1.8	2.0
	Working pressure, (bar)
6	450	600	760	1,000
8		440	550	730
10		340	430	570
12		280	350	460	580	660

The operating pressure of the tube is calculated according to ASME B622 standard and is calculated at temperatures from -28 to 37°C.

The pressure safety factor is 3.6.

825 alloy tube

Annealed alloy C276 tube per ASTM B622. The tube must be suitable for bending and must not have deep scratches. Vickers hardness 201 or less. Diameter tolerances: +/- 0.13 mm.

Table 11. Alloy 825 Inch Tubing

Tube diameter, inch	Wall thickness, inch
	0.020	0.028	0.035	0.049	0.065	0.083

1/8	7,300	10,700	13,700
3/16	4,700	6,800	8,800	12,800
1/4		5,000	6,400	9,300	12,700
5/16			5,000	7,300	10,000
3/8			4,100	5,900	8,200
1/2			3,000	4,300	5,900	7,800

Table 12. Metric Alloy 825 Tube

Tube diameter, mm	Wall thickness, inch, ((m))
	0.8	1.0	1.2	1.5	1.8	2.0
	Working pressure, (bar)
6	460	600	730	930
8		430	530	680
10		340	410	530
12		280	340	430	530	600

The operating pressure of the tube is calculated according to ASME B423 standard and is calculated at temperatures from -28 to 37°C.
The pressure safety factor is 3.65.

Table 13. Inch seamless Super Duplex tube

Annealed alloy C276 tube per ASTM A789. The tube must be suitable for bending and must not have deep scratches. Vickers hardness 32 or less. Diameter tolerances: +/- 0.13 mm.

The operating pressure of the tube is calculated according to ASME B423 standard and is calculated at temperatures from -28 to 37 °C.
The pressure safety factor is 3.

625 alloy tube

Table 14. Alloy 625 Inch Tubing

Wall thickness, inch	Wall thickness, (inch)
	0.020	0.028	0.035	0.049	0.065	0.083
	Working pressure (psi)
1/8	8,400	12,200	15,600
3/16	5,400	7,800	10,100	14,600
1/4		5,700	7,300	10,600	14,600
5/16			5,700	8,300	11,400
3/8			4,700	6,800	9,300
1/2			3,400	5,000	6,800	8,900

Table 15. Metric Alloy 625 Tube

Tube diameter, mm	Wall thickness, (mm)
		1.0	1.2	1.5	1.8	2.0
	Working pressure (psi)
6	473	614	754	967
8		447	547	707
10		347	427	547
12		287	353	447	547	620

600 alloy tube

Table 16. Alloy 600 inch tube

Tube OD in.	Tube Wall Thickness, in.
	0.028	0.035	0.049	0.065
	Working Pressure (psig)
1/4	4,000	5,100	7,500	10,200
3/8		3,300	4,800	6,500
1/2		2,400	3,500	4,700

Table 17. Metric Alloy 600 Tube

The pressure safety factor is 5.

Alloy 20 tube

Table 18. Alloy 20 inch tube

Tube diameter, inch
	0.02	0.028	0.035	0.049	0.065	0.083
	Working pressure (psi)
1/8	6800	9900	12700
3/16	4400	6300	8200	11900
1/4		4700	5900	8700	11900
5/16			4700	6800	9400
3/8			3800	5500	7600
1/2			2800	4100	5500	7300

Table 19. Metric Alloy 20 Tube

Tube diameter, mm	Wall thickness, (mm)
	0.8	1.0	1.2	1.5	1.8	2.0
	Working pressure, (bar)
6	390	500	610	780
8		360	440	570
10		280	350	440
12		230	280	360	450	500

The operating pressure of the tube is calculated according to ASME B167 standard and is calculated at temperatures from -28 to 37°C.
The pressure safety factor is 5.

Titanium tubes

Table 20. Inch seamless tube

Table 21. Metric Seamless Tubing

Seamless aluminum tubes

Table 22. Inch aluminum tube

Tube diameter, mm	Wall thickness, (inch)
	0.035	0.049	0.065	0.083	0.095
	Working pressure (psi)
1/8	8600
3/16	5600	8000
1/4	4000	5900
5/16	3100	4600
3/8	2600	3700
1/2	1900	2700	3700
5/8	1500	2100	2900
3/4		1700	2400	3200
1		1300	1700	2300	2700

Table 23. Metric aluminum tube

Tube diameter, mm	Wall thickness, (mm)
	1.0	1.2	1.5	1.8	2.0	2.2	2.5
	Working pressure, (bar)
6	340	420
8	250	300
10	190	240
12	160	190	250	310
14	130	160	210	260
15	120	150	190	240
16	120	140	180	220
18		120	160	190	220
20			140	170	190
22			130	150	170	190
25			110	130	150	170	190

Decrease in tube operating pressure with increasing temperature

As the temperature rises, the operating pressure of the fittings and tube decreases.
To determine the operating pressure of the tube and fittings, multiply the pressure by the reduction factor from Table 24.

Seamless 316 stainless steel tubing with 1/2" diameter and 0.065" wall thickness.
Working pressure at -28 to 37°C 5100 psi as shown in Table 1.
To determine operating pressure at 649°C, multiply 5100 psi by 0.37 from the table 5100 psi x 0.37 = 1887 psi

Table 24. Pressure reduction coefficients with increasing temperature

ASTM standard		A269	B75	A179	B165	B622	B423	B444	B167	A789	B729	B338	B210
Temperature		Stainless steel steel 316	Copper	Carbon. steel	Alloy 400	Alloy 276	Alloy 825	Alloy 625	Alloy 600	Super duplex	Alloy 20	Titanium	Aluminum
F °	C °	Stainless steel steel 316	Copper	Carbon. steel	Alloy 400	Alloy 276	Alloy 825	Alloy 625	Alloy 600	Super duplex	Alloy 20	Titanium	Aluminum
100	38	1	1	1	1	1	1	1	1	1	1	1	1
200	93	1	0.80	0.96	0.88	1	1	0.92	1	1	0.86	0.88	1
300	149	1	0.78	0.90	0.82	1	1	0.88	1	0.86	0.85	0.72	1
400	204	0.97	0.50	0.86	0.79	1	1	0.85	1	0.82	0.83	0.61	0.94
500	260	0.9	0.13	0.82	0.79	0.99	1	0.81	1	0.81	0.83	0.53	0.81
600	316	0.85		0.77	0.79	0.93	1	0.79	1	0.81	0.83	0.45	0.56
650	343	0.84		0.75	0.79	0.90	1	0.78	1		0.82		0.40
700	371	0.82		0.73	0.79	0.88	1	0.77	1		0.82
750	399	0.81		0.68	0.78	0.86	1	0.76	1		0.82
800	427	0.80		0.59	0.76	0.84	0.99	0.75	1		0.82
850	454	0.79		0.50	0.59	0.83	0.98	0.74	0.98
900	482	0.78		0.41	0.43	0.82	0.98	0.73	0.80
950	510	0.77		0.29		0.81	0.97	0.73	0.53
1000	538	0.77		0.16		0.80	0.96	0.72	0.35
1050	566	0.73		0.10		0.68		0.72	0.23
1100	593	0.62		0.06		0.55		0.72	0.15
1150	621	0.49				0.45		0.72	0.11
1200	649	0.37				0.36		0.72	0.10
1250	677	0.28				0.29

Ordering information

Tube designation

Diameter inch	1/16	1/8	3/16	1/4	5/16	3/8	1/2	5/8	3/4	7/8	1	1 1/4	1 1/2	2
Designation	1	2	3	4	5	6	8	10	12	14	16	20	24	32

Diameter mm

2mm

3mm

4mm

6mm

8mm

10mm

12mm

16mm

18mm

22mm

25mm

32mm

38mm

50mm

Designation

10M

12M

16M

18M

22M

25M

32M

38M

50M

Thread size designation

Thread size, inch	1/16	1/8	1/4	3/8	1/2	3/4	1	1 1/4	1 1/2	2
Designation	1	2	4	6	8	12	16	20	24	32
N	1N	2N	4N	6N	8N	12N	16N	20N	24N	32N
R	1R	2R	4R	6R	8R	12R	16R	20R	24R	32R
G	-	2G	4G	6G	8G	12G	16G	20G	24G	32G

Material designation

Material	Designation
Material	Element	Assembled product
Stainless steel steel 316/316L	SS	S.S.A.
Carbon steel	WITH	C.A.
Brass	B	B.A.
6Mo	6MO	6MOA
Alloy 20	L20	L20A
Monel 400	L400	L400A
Alloy 600	L600	L600A
Alloy 625	L625	L625A
Alloy 825	L825	L825A
Hasteloy	C276	C276A
Duplex	D	D.A.
Super duplex	SD	S.D.A.
Titanium	TI4	TI4A
Aluminum	AL	A.L.A.
Teflon (PTFE)	P.E.	PEA

To order, select the appropriate product number and add the material designation to it.

To order an assembled fitting, add the material designator and the assembled designation. Example: AU-8-SSA
To order an item, add only the material designation to the number. Examples: Stainless steel nut steel 1/2 inch: AN- 8 - SS Front ring made of stainless steel. steel 1/2 inch: AFF-8-SS

The impulse tube is the main element of pneumatic and hydraulic control systems. The number of control drives at oil refineries and chemical plants amounts to hundreds and sometimes thousands. Such figures are due to the particular complexity technological processes, high level of automation and fire and explosion hazard of production.

One of the most current problems currently there is a lack detailed instructions for installation of impulse tubes. The most famous document regulating this area of work is SNiP 3.05.07-85. The laying of pipes is standardized in the chapter “PIPE LININGS”. However, these norms and rules indicate only general points, for example, such as:

clause "3.21. Pipe lines, with the exception of those filled with dry gas or air, must be laid with a slope that ensures condensate drainage and gas (air) removal, and have devices for their removal."

Having extensive experience in installation various systems, the NTA-Prom company provides training for operating services in various areas. In particular, at our seminars we teach how to lay impulse pipes and how to work with them.

It should be noted that the use of an impulse tube when laying pneumatic and hydraulic systems is much more convenient compared to using thick-walled pipes. A number of arguments can be given to prove the above:

During installation, the impulse tube can be bent using a special tool. When using thick-walled pipes, it is necessary to absolutely accurately take into account and lay out all bends, runs and transitions in advance.
Fewer connections than a pipe results in fewer potential leak paths.
When bending the impulse tube there are no right angles as when using bends. Accordingly, when transporting a medium in pipelines made from a seamless tube, there is a lower pressure drop and less likelihood of hydraulic shocks and destructive vibrations of the pipeline.
Laying impulse lines is more economical in terms of materials and work space.

Below we will briefly summarize the most important principles impulse tube gaskets:

1.The tube must be placed following the basic rules:

1.1Avoid placing the tube directly in front of various structural connections, doors, hatches and equipment.

1.2 It is prohibited to block access to equipment controls and emergency shutdown buttons.

1.3 When laying, it is necessary to provide for the possibility of subsequent repair and maintenance of the lines.

1.4 Pipes installed at a low level should not be used for support.

1.5 Tubes must be placed in such a way that there is no danger of falling.

1.6 Tubes installed on high level, should not be used as handrails.

1.7 Pipes should not be used as a support for other objects

2. When laying pipes, pipe supports must be used.

2.1 Proper support limits the impact of impulses and vibration on impulse lines.

2.2 To avoid sagging of the pipe, when installing the pipe, long spans without supports should not be formed.

2.3 Pipe lines should not be subject to torsional or linear forces from other equipment (valves, fittings, regulators, etc.)

2.4 The interval for installing supports is determined based on the characteristics of the medium and the diameter of the tube.

3. Installation of several tubes must be carried out vertically in a row.

3.1 When installing several pipes, avoid places where dirt, aggressive media and pollutants accumulate.

3.2 In the case of horizontal installation of the tube due to special needs, the tubes must be placed in boxes or protective covers.

4. When installing tubes, it is necessary to install compensation loops:

4.1 Thanks to the use of expansion loops, it is possible to replace the section of tube between the fittings.

4.2 The use of compensation loops allows you to compensate for the compression and expansion of tubes during temperature fluctuations.

4.3 Hinges also allow easy access for maintenance and removal of fittings.