ASTM A234 WP91 Prefabricated Pipe Spools For power plant
We are professional manufacturer of ASTM A234 WP91 Prefabricated Pipe Spools For power plant in China.
What is Prefabricated Pipe Spools?
Prefabricated pipe spools are pre-assembled sections of piping, including pipes, fittings, flanges, and other components, that are manufactured in a controlled environment before being shipped to the job site for installation. They help reduce on-site labor, minimize welding and assembly time, and improve overall project efficiency.
ASTM A234 WP91 Prefabricated Pipe Spools mainly used for 4 major pipelines in powerplant.
1: Main steam pipeline (two high-temperature and high-pressure steam pipelines between the outlet header of the superheater and the high-pressure main valve interface);
- Transports high-pressure, high-temperature steam from the boiler to the turbine.
- Typically made of alloy steel (e.g., P91, P22) to withstand extreme conditions.
2: Hot reheat steam pipes (two high temperature and high pressure steam pipes from the outlet header of the reheater to the interface of the medium pressure main valve);
3: Cold and reheat steam pipes (two high-temperature and high-pressure steam pipes between the steam exhaust port of the high-pressure cylinder and the inlet header interface of the reheater);
4: High-pressure water supply pipeline (the high-pressure boiler supply water pipeline between the outlet of the electric feed pump and the header interface of the inlet of the economizer)
ASTM A234 WP91 Chemical Composition
| C, % | Mn, % | P, % | S, % | Si, % | Cr, % | Mo, % | Ni, % |
|---|---|---|---|---|---|---|---|
| 0.08-0.12 | 0.3-0.6 | 0.02 max | 0.01 max | 0.5 | 8.5-9.5 | 0.85-1.05 | 0.4 max |
ASTM A234 WP91 Mechanical Properties
| Tensile Strength , MPa | Yield Strength, MPa | Elongation, % | Hardness, HB |
|---|---|---|---|
| 415 min | 585 min | 20 min | 248 max |
Advantages of Prefabricated Pipe Spools
- Time Savings – Reduces on-site fabrication time.
- Quality Control – Manufactured in a controlled environment with strict quality checks.
- Cost Efficiency – Minimizes labor costs and material wastage.
- Safety – Reduces on-site welding and cutting, lowering the risk of accidents.
- Customization – Designed as per project specifications for seamless integration.
Materials Used
- Carbon Steel (A105, A106, A53, etc.)
- Stainless Steel (304, 316, Duplex, etc.)
- Alloy Steel (P11, P22, P91, etc.)
Application of our prefabricated Pipe Spools
- Oil & Gas
- Power Plants
- Chemical & Petrochemical
- Water Treatment
- Shipbuilding
Why Choose ASTM A234 WP91 Prefabricated Spools?
- High-Temperature Resilience
ASTM A234 WP91 alloy, composed of 8.0–9.5% chromium, 0.85–1.05% molybdenum, and trace elements like vanadium and niobium, excels in environments exceeding 600°C. This composition prevents creep deformation and thermal fatigue, making it ideal for boilers, superheaters, and steam pipelines - Robust Mechanical Properties
- Tensile Strength: 585–760 MPa
- Yield Strength: ≥415 MPa
- Elongation: ≥20% (4D gauge length)
These properties ensure structural integrity under extreme pressures, reducing the risk of failures in high-stress applications
- Optimized Fabrication & Compliance
Prefabricated spools adhere to ASTM A234 and ASME B16.9/B16.11 standards, guaranteeing dimensional precision and weldability. Post-fabrication heat treatment—normalizing at 1040–1080°C and tempering at 730–800°C—enhances grain structure and stress resistance - Corrosion & Oxidation Resistance
The alloy’s chromium content forms a protective oxide layer, resisting sulfidation and oxidation in acidic or sulfur-rich environments, such as refinery flare systems or desalination plants
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