Basket Strainer 4 inch 900LB Flanged RF - A216-WCB Body, SS316 Screen, Bolted Bonnet
Tengs Valve supplies this 4 inch 900LB flanged RF basket strainer for high-pressure pipeline filtration. The valve is designed to ASME B16.34 with ASME B16.5 RF flanged ends. The body and bolted bonnet are made of ASTM A216-WCB cast carbon steel, and the basket screen is ASTM A240 SS316 stainless steel for corrosion resistance. The bolted bonnet design allows easy access for screen cleaning and replacement. This 900LB basket strainer is suitable for oil and gas, petrochemical, power generation, water treatment and general industrial piping systems where reliable debris removal is required.
Basket Strainer 4 inch 900LB Specification
• Strainer: 4 inch Class 900LB Flanged RF Basket Strainer
• Size: 4 inch (DN100)
• Pressure Rating: Class 900LB
• Suitable Medium: Water, gas, oil, steam etc.
• Strainer Material:
• Body: ASTM A216-WCB
• Bonnet: ASTM A216-WCB
• Gasket: Spiral Wound SS316 plus Graphite
• Bolting: A193 B7 plus A194 2H
• Screen and Basket:
• Material: SS316 Stainless Steel
• Perforated Hole Size: 2mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm etc.
• Wire Mesh Size: 10, 20, 40, 60, 80, 100 mesh etc.
• End Connection: Flanged RF, ASME B16.5
• Cover Type: Bolted Bonnet
• Drain Connection: Threaded Plug or Flanged Drain on Request
✓ 4 inch 900LB high pressure basket strainer with A216-WCB cast body, SS316 screen and bolted bonnet for reliable high-pressure filtration
Basket Strainer Standards
1. Design and Manufacture: ASME B16.34
2. Inspection and Test: API 598
3. End Flange Dimension: ASME B16.5 (4 inch Class 900 RF)
4. Face to Face and End to End: ASME B16.10
5. Pressure-Temperature Ratings: ASME B16.34
High Pressure Basket Strainer Pressure Rating: Class 300 vs 600 vs 900
| Pressure Class | Design Pressure (bar) | Design Pressure (psi) | Typical Application |
|---|---|---|---|
| ANSI Class 300 | 51 | 740 | General hydrocarbon, medium-pressure process piping |
| ANSI Class 600 | 102 | 1,480 | High-pressure process, refinery, power plant |
| ANSI Class 900 | 153 | 2,220 | Very high-pressure process, wellhead, gas injection, high-pressure steam |
Reference: ASME B16.34. Class 900 is selected for very high-pressure service such as wellhead, gas injection and high-pressure steam systems. Class 600 is the standard high-pressure class for refinery and power plant; Class 300 is more economical for medium-pressure piping.
Class 900LB Basket Strainer Body Material Selection
| Body Material | Standard | Key Characteristic | Typical Application |
|---|---|---|---|
| A216-WCB | ASTM A216 | Cast carbon steel, good strength and weldability | 4 inch Class 900 high-pressure process, oil and gas, power plant |
| A216-WCC | ASTM A216 | Cast carbon steel, higher strength than WCB | Higher-pressure general service |
| A351-CF8M | ASTM A351 | Cast stainless steel SS316, corrosion resistant | Corrosive media, chemical and offshore service |
| A105N | ASTM A105 | Normalized forged carbon steel | Flange, cover, drain flange for Class 900 service |
Reference: ASTM A216, A351, A105. A216-WCB is the standard cast carbon steel for 4 inch Class 900 basket strainer body; A216-WCC offers higher strength for higher-pressure general service; A351-CF8M is selected for corrosive media; A105N is the normalized forged steel for flange and cover.
Bolted Bonnet Design Features
| Feature | Description | Benefit |
|---|---|---|
| Bolted Bonnet | Cover secured by A193 B7 studs and A194 2H nuts | Easy access for basket cleaning, inspection and replacement without removing the valve from the pipeline |
| Spiral Wound Gasket | SS316 plus graphite spiral wound gasket to ASME B16.20 | Reliable sealing for Class 900 high-pressure service |
| SS316 Basket | Corrosion-resistant SS316 perforated plate or wire mesh basket | Long service life in water, chemical and marine environments |
Reference: ASME B16.34, ASME B16.20, API 598. Bolted bonnet is the standard cover design for 4 inch Class 900 basket strainer; Davit Arm and Support Legs are available on request for larger sizes.
Main Material List For 4 inch 900LB Basket Strainer
| No. | Part Name | Material | Standard |
|---|---|---|---|
| 01 | Body | A216-WCB | ASTM A216 |
| 02 | Bonnet | A216-WCB | ASTM A216 |
| 03 | Basket / Screen | SS316 | ASTM A240 / A276 |
| 04 | Gasket | Spiral Wound SS316 plus Graphite | ASME B16.20 |
| 05 | Cover Bolt | A193 B7 | ASTM A193 |
| 06 | Cover Nut | A194 2H | ASTM A194 |
| 07 | Drain Plug | A105 | ASTM A105 |
| 08 | Davit Arm | On Request | |
| 09 | Support Legs | On Request | |
Reference: ASME B16.34, API 598, ASTM A216, A240, A276, A105, A193, A194. A216-WCB is the standard cast carbon steel body material; SS316 is the standard basket screen material. Davit Arm and Support Legs are available on request for larger sizes. Contact us for confirmed material certificate to EN 10204 3.1.
4 inch 900LB Basket Strainer Applications
• Oil and gas: high-pressure gathering lines, wellhead piping and injection systems requiring Class 900 rating.
• Petrochemical: high-pressure process lines, hydrotreating and catalytic cracking systems.
• Power generation: high-pressure steam, feedwater and auxiliary piping protection.
• Water treatment: high-pressure water lines requiring SS316 corrosion-resistant screens.
• Chemical processing: corrosive media filtration with SS316 basket screens in A216-WCB body.
• General industrial: compressed air, steam and high-pressure utility lines.
FAQ - 4 inch 900LB Flanged RF Basket Strainer
Q1: What is a 4 inch 900LB flanged RF basket strainer?
A: A 4 inch 900LB flanged RF basket strainer is a basket type pipeline filter with a 4 inch (DN100) bore, rated to ANSI Class 900 (153 bar / 2,220 psi at ambient temperature), with raised face (RF) flanged ends to ASME B16.5. It is designed to ASME B16.34 and used to remove solid particles from high-pressure liquids and gases before they reach pumps, valves and other equipment.
Q2: What does A216-WCB body material offer?
A: ASTM A216-WCB is a cast carbon steel widely used for valves in moderate to high-temperature services. It provides good strength, toughness and weldability, making it suitable for high-pressure basket strainer bodies in oil and gas, steam and general industrial piping. For more corrosive media, A351-CF8M cast stainless steel is available on request.
Q3: Why use an SS316 stainless steel screen?
A: SS316 stainless steel offers excellent corrosion resistance against water, chemicals and marine environments. It helps extend screen service life and maintain filtration performance in corrosive or high-purity process media. Perforated plate and wire mesh are both available in SS316.
Q4: What is a flanged RF connection and why is it used?
A: RF means raised face flange. The raised face compresses the gasket against the mating flange to provide a reliable seal. This 4 inch basket strainer uses ASME B16.5 RF flanges for 900LB service. RF is the standard choice for general high-pressure service; RTJ ring joint flanges are available on request for very high-pressure and high-temperature service.
Q5: What is the advantage of a bolted bonnet design?
A: A bolted bonnet allows easy removal of the cover for basket cleaning, inspection and replacement without removing the entire valve from the pipeline. The cover is secured by A193 B7 studs and A194 2H nuts with a spiral wound SS316 plus graphite gasket, providing reliable sealing for Class 900 service while reducing maintenance time.
Q6: Can the screen mesh be customized and how can I get a quote?
A: Yes. The SS316 basket screen can be supplied with different perforated hole sizes (2mm to 10mm) or wire mesh sizes (10 to 100 mesh) according to your filtration requirements. Please provide your required mesh size, flow rate and dimension drawings to obtain an accurate quotation. We will reply within 24 hours with price, drawing and delivery time.
Request a Quote for 4 inch 900LB Basket Strainer
Send us your size (4 inch / DN100), pressure rating (Class 900LB), body material (A216-WCB), end connection (RF), screen material (SS316), perforated hole size (2-10mm) or mesh size (10-100), and quantity. Our team will reply within 24 hours with price, drawing, and delivery time.
Email: sales@tengsvalve.com
Website: Request a Quote Online
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