Introduction And Specifications Of Fluid Pipes

1. Overview of fluid pipes

Fluid pipes are pipes specially used for conveying media with fluid properties.

Medium with fluid properties, in addition to liquid media such as water, oil, and solution, solid media such as cement, grain, and coal powder can also flow under certain conditions.

The fluid tube can be made of steel, copper, titanium and other non-ferrous metals, or even plastic and other non-metallic materials.

The fluid pipe must have a hollow section, but it can also be square, triangular or any other shape. Some equipment is restricted by conditions, and rectangular pipes must be used, but most of them still use round pipes. The round tube has the smallest perimeter/area ratio in all geometric sections, that is, the largest internal section can be obtained under the same number of materials.

Due to its low cost and high strength, steel pipes are widely used in fluid transportation in modern society. According to its production process, steel pipes are divided into seamless steel pipes and welded pipes. Among them, welded pipes are divided into high-frequency straight seam welded pipes (ERW), spiral welded pipes (SSAW), submerged arc welded pipes (UOE) and so on. In the past, seamless steel pipes were traditionally used for fluid pipes. With the development and progress of material science, forming technology, and unit equipment, welded pipes have been greatly developed. Welded pipes have the advantages of better wall thickness uniformity, higher precision, less energy consumption, and higher production efficiency than seamless pipes. The demanding oil and gas transmission pipes (API standards) used to be almost 100% seamless pipes. Today, in the United States, Over 95% of developed countries in Japan and Europe have been replaced by welded pipes.

2. Requirements

When welded pipe is used as a fluid pipe, it has different requirements from ordinary steel pipe:

2.1 Welds are not allowed to leak. For welded pipes required by APIs, ultrasonic flaw detection and water pressure test are also required for the weld of each welded pipe;

2.2 For transporting corrosive chemical solutions, all steel pipes must be treated with anti-corrosion on the inner wall;

2.3 All fluid pipes need to remove internal burrs to reduce fluid transport resistance.

3. Fluid pipe specification table

4*1/6-14*1-3	38*5.5	89*5	133*18
14*3.5	42*3	89*5.5	159*6
14*4	42*3.5	89*6	159*6.5
16*3	42*4	89*7	159*7
18*2	42*5	89*7.5	159*8
18*3	42*6	89*8	159*9.5
18*4	42*8	89*9	159*10
18*5	45*3	89*10	159*12
19*2	45*4	89*11	159*14
21*4	45*5	89*12	159*16
22*2.5	45*6	108*4.5	159*18
22*3	45*7	108*5	159*20
22*4	48*4	108*6	159*28
22*5	48*4.5	108*7	168*6
25*2.5	48*5	108*8	168*7
25*3	48*6	108*9	168*8
25*4	48*7	108*10	168*9.5
25*5	48.3*12.5	108*12	168*10
25*5.5	51*3	108*14	168*11
27*3.5	51*3.5	108*15	168*12
27*4	51*4	108*16	168*14
27*5	51*5	108*20	168*15
27*5.5	51*6	114*5	168*16
28*2.5	57*4	114*6	168*18
28*3	57*5	114*7	168*20
28*3.5	57*5.5	114*8	168*22
28*4	57*6	114*8.5	168*25
30*2.5	60*4	114*9	168*28
32*2.5	60*4	114*10	180*10
32*3	60*5	114*11	194*10
32*3.5	60*6	114*12	194*12
32*4	60*7	114*13	194*14
32*4.5	60*8	114*14	194*16
32*5	60*9	114*16	194*18
34*3	60*10	114*18	194*20
34*4	76*4.5	133*5	194*26
34*4.5	76*5	133*6	219*6.5
34*5	76*6	133*7	219*7
34*6.5	76*7	133*8	219*8
38*3	76*8	133*10	219*9
38*3.5	76*9	133*12	219*10
38*4	76*10	133*13	219*12
38*4.5	89*4	133*14	219*13
38*5	89*4.5	133*16	219*14
Specification	Specification	Specification	Specification
219*16	273*36	356*28	426*12
219*18	273*40	356*36	426*13
219*20	273*42	377*9	426*14
219*22	273*45	377*10	426*17
219*24	298.5*36	377*12	426*20
219*25	325*8	377*14	426*22
219*26	325*9	377*15	426*30
219*28	325*10	377*16	426*36
219*30	325*11	377*18	426*40
219*32	325*12	377*20	426*50
219*35	325*13	377*22	457*9.5
219*38	325*14	377*25	457*14
273*7	325*15	377*32	457*16
273*8	325*16	377*36	457*19
273*9	325*17	377*40	457*24
273*9.5	325*18	377*45	457*65
273*10	325*20	377*50	508*13
273*11	325*22	406*9.5	508*16
273*12	325*23	406*11	508*20
273*13	325*25	406*13	508*22
273*15	325*28	406*17	558.8*14
273*16	325*30	406*22	530*13
273*18	325*32	406*32	530*20
273*20	325*36	406*36	570*12.5
273*22	325*40	406*40	610*13
273*25	325*45	406*55	610*18
273*28	356*9.5	406.4*50	610*78
273*30	356*12	406.4*55	624*14.2
273*32	356*15	406*60	824*16.5
273*35	356*19

Allowable deviation

Deviation level	Allowable deviation of standardized outer diameter
D1	±1.5%，min±0.75 mm
D2	±1.0%。min±0.50 mm
D3	±0.75%．min±0.30 mm
D4	±0.50%。min±0.10 mm

HSH stocks a broad range of metal materials, including aluminum, steel, stainless steel, copper and brass, and specialty metals. Also, we also sell cast fittings, cast Iron, forged fittings, cutting tools, flanges, ect. If you have any needs or questions, you can contact us.
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