Stainless Pipes for Oil Cracking

Description

Product Description Stainless Pipes for Oil Cracking

Stainless Pipes for Oil Cracking  is specifically designed for oil cracking applications. These pipes are engineered to withstand the extreme conditions of oil refining processes, ensuring durability, reliability, and efficiency. Stainless steel pipes are commonly used in oil cracking processes due to their excellent corrosion resistance, strength, and ability to withstand high temperatures. The oil cracking process involves the thermal decomposition of large hydrocarbons into smaller molecules like gasoline, diesel, and other byproducts.

Stainless Pipes for Oil Cracking Dimensions

Size (inches)	Outer Diameter (OD) (mm)	Wall Thickness (mm)	Schedule
1/2	21.3	2.1	SCH 40
3/4	26.7	2.3	SCH 40
1	33.4	2.6	SCH 40
1 1/4	42.2	3.0	SCH 40
1 1/2	48.3	3.2	SCH 40
2	60.3	3.6	SCH 40
2 1/2	73.0	4.0	SCH 40
3	88.9	4.5	SCH 40
4	114.3	5.0	SCH 40
6	168.3	6.0	SCH 40
8	219.1	7.0	SCH 40
10	273.0	8.0	SCH 40

Nominal Pipe Size (NPS):

1. 1. Range: Stainless steel pipes for oil cracking typically range from NPS 1/2 (DN 15) to NPS 48 (DN 1200) or larger, depending on the capacity and requirements of the process.
   2. Common Sizes: NPS 2, NPS 4, NPS 6, NPS 8, NPS 10, NPS 12, NPS 14, NPS 16, NPS 18, NPS 20.

Pipe Wall Thickness (Schedule/Thickness):

1. The pipe thickness is essential for maintaining strength and durability, particularly under high pressure and temperature. Stainless steel pipes for oil cracking are available in different schedules, with Schedule 40 and Schedule 80 being the most common for standard applications.
2. For high-pressure systems, heavier schedules such as Schedule 160 or Schedule XXS (extra heavy) may be used.

Popular schedules for oil cracking pipes:

1. Schedule 40 (Standard)
2. Schedule 80 (Heavy)
3. Schedule 160 (Extra Heavy)
4. Schedule XXS (Extra Extra Heavy)

Outside Diameter (OD):

• The outside diameter of the pipe will depend on the pipe size (NPS) and wall thickness. For example:
  1. NPS 2 pipe typically has an OD of 2.375 inches (60.33 mm).
  2. NPS 4 pipe has an OD of 4.500 inches (114.3 mm).
  3. NPS 8 pipe has an OD of 8.625 inches (219.1 mm).

Pipe Length:

• 1. Standard lengths: Typically available in 20 ft (6 meters) lengths or custom-cut lengths depending on project requirements.
  2. For large-scale oil cracking operations, custom lengths and pipe spools are often fabricated on-site.

Custom Sizes:

• 1. Stainless steel pipes for oil cracking can also be custom-manufactured to specific sizes that meet the operational requirements of specialized cracking units.
  2. The pipe diameter, wall thickness, and other features like bends and joints can be tailored for complex designs.

Chemical Composition Stainless Pipes for Oil Cracking

Element (%)	Grade 304	Grade 316	Grade 321	Grade 347
Carbon (C)	≤ 0.08	≤ 0.08	≤ 0.08	≤ 0.08
Manganese (Mn)	≤ 2.00	≤ 2.00	≤ 2.00	≤ 2.00
Silicon (Si)	≤ 0.75	≤ 0.75	≤ 0.75	≤ 0.75
Phosphorus (P)	≤ 0.045	≤ 0.045	≤ 0.045	≤ 0.045
Sulfur (S)	≤ 0.030	≤ 0.030	≤ 0.030	≤ 0.030
Chromium (Cr)	18.00-20.00	16.00-18.00	17.00-19.00	17.00-19.00
Nickel (Ni)	8.00-10.50	10.00-14.00	9.00-12.00	9.00-13.00
Molybdenum (Mo)	-	2.00-3.00	-	-
Titanium (Ti)	-	-	≥ 5x(C+N)	-
Columbium (Nb)	-	-	-	10x(C+N)
Nitrogen (N)	≤ 0.10	≤ 0.10	≤ 0.10	≤ 0.10
Iron (Fe)	Balance	Balance	Balance	Balance

Mechanical Properties Table for Stainless Pipes for Oil Cracking

Property	Value
Tensile Strength	≥515 MPa (74,800 psi)
Yield Strength	≥205 MPa (29,700 psi)
Elongation (in 50mm)	≥35%
Hardness (Rockwell B)	≤95
Impact Strength	High at both room and low temperatures
Modulus of Elasticity	193 GPa (28,000 ksi)
Thermal Conductivity	16.2 W/m·K (at 100°C)
Specific Heat Capacity	500 J/kg·K
Density	7.9 g/cm³
Melting Point	1400-1450°C (2550-2650°F)

Corrosion Resistance

Stainless steel offers outstanding resistance to corrosion, making it an ideal choice for handling the aggressive chemical environment of oil cracking. Cracking units are subject to exposure to various acids, gases, and oils that can cause degradation of conventional materials. Stainless steel alloys, such as 316L and 904L, are specifically engineered to resist pitting, crevice corrosion, and stress corrosion cracking in environments where acids and high chlorides are present.

High-Temperature Resistance

Oil cracking processes generate extremely high temperatures, which can cause degradation or failure in many materials. Stainless steel pipes maintain their structural integrity even at elevated temperatures, thanks to their ability to resist oxidation and maintain strength at high temperatures. Grade 316L and 904L are particularly known for their high heat resistance, making them ideal for use in high-temperature cracking furnaces and reactors.

Durability

The durability of stainless steel pipes is unmatched in high-stress environments. These pipes exhibit resistance to wear and tear, as well as excellent mechanical properties, ensuring that they can withstand the demanding conditions of oil cracking. Stainless steel’s ability to resist thermal expansion and contraction further enhances its longevity in systems exposed to fluctuating temperatures and pressure.

Hygienic Properties

In applications where purity is critical, such as in refining high-quality fuels and chemicals, stainless steel offers a smooth, non-porous surface that prevents contamination. This ensures that the material does not degrade or leach harmful substances into the processed oil, which is crucial for maintaining product quality and meeting stringent safety standards. Stainless steel also resists bacterial growth, which is an added benefit in maintaining the cleanliness of systems used in oil cracking.

Conclusion

Stainless steel pipes for oil cracking are engineered to withstand the rigorous conditions of high-temperature and high-pressure environments encountered in oil refineries. The material’s robust chemical composition and superior mechanical properties ensure durability, longevity, and resistance to corrosion and oxidation. With compliance to stringent industry standards and certifications, these pipes are ideal for critical applications in the oil and gas industry.