Stainless Steel A351-CF8M Y Type Strainer - ANSI Class 150 to 900, 2 inch to 24 inch
Tengs Valve supplies high-quality Stainless Steel A351-CF8M Y Type Strainers for ANSI Class 150, 300, 600 and 900 service, manufactured with bolted cover design and available with flanged FF or RF ends to ASME B16.5. Body is cast stainless steel A351-CF8M (SS316), equivalent to EN-GX5CrNiMo19-11-2 (1.4408), with forged stainless steel A182-F316 / F316L cover. Sizes range from 2 inch to 24 inch (DN50 to DN600). Screens are supplied in stainless steel 316, 316L and DSS, as perforated plate (1mm to 5mm hole) or wire mesh (SS304, SS316, 10-100 mesh). Drain connection is available as plug or flange. Ideal for chemical, petrochemical, offshore, seawater, pulp and paper, and corrosive process piping service in ASME standard systems.
A351-CF8M Y Type Strainer Specification
• Strainer Type: Y Type, Y Pattern
• Sizes: 2 inch to 24 inch (DN50 to DN600)
• Pressure Rating: ANSI 150Lb / 300Lb / 600Lb / 900Lb
• Body Material: Cast Stainless Steel A351-CF8M (SS316), A351-CF3M (SS316L) available
• EN Equivalent: CF8M = EN 1.4408, CF3M = EN 1.4404
• Strainer Screen: Stainless Steel 316, 316L, DSS etc.
• Perforated Hole Size: 1mm, 2mm, 3mm, 4mm, 5mm etc.
• Wire Mesh: Stainless Steel SS304, SS316
• Mesh Size: 10, 20, 40, 60, 80, 100 mesh etc.
• End Connection: Flanged FF (Flat Face), Flanged RF (Raised Face)
• Cover Type: Bolted Cover, Flanged with Blind Flange
• Drain Connection: Plug, Flange
• Design and Manufacture: ASME B16.34
• Inspection and Test: API 598
• Flange Dimension: ASME B16.5
• Face to Face: ASME B16.10
✓ A351-CF8M stainless steel Y strainer provides corrosion-resistant filtration for chemical, petrochemical and offshore service across ANSI Class 150 to 900
A351-CF8M Y Strainer Pressure Rating Comparison: CL150 to CL900
| Pressure Rating | Design Pressure (bar) | Design Pressure (psi) | Typical Application |
|---|---|---|---|
| ANSI CL150 | 19.6 | 285 | Corrosive water, chemical feed, food and pharmaceutical service |
| ANSI CL300 | 51 | 740 | Chemical and petrochemical process piping, medium-pressure corrosive media |
| ANSI CL600 | 102 | 1,480 | High-pressure chemical, refinery, offshore process piping |
| ANSI CL900 | 153 | 2,220 | Very high-pressure chemical, sour gas, offshore and seawater injection service |
Reference: ASME B16.34. CF8M stainless steel Y strainers are available in Class 150, 300, 600 and 900 to match the pressure rating of the pipeline system. Class 300 is the most common rating for chemical and petrochemical process service.
A351-CF8M vs CF3M Stainless Steel Material Selection
| ASTM Grade | Equivalent | EN Material Number | Key Characteristic | Typical Application |
|---|---|---|---|---|
| A351-CF8M | SS316 | 1.4408 | Mo-bearing cast stainless, standard chloride resistance | Chemical, petrochemical, offshore, seawater service |
| A351-CF3M | SS316L | 1.4404 | Low-carbon + Mo-bearing, better weldability and corrosion resistance | Pharmaceutical, food, high-purity chemical, welded construction |
| A182-F316 | SS316 forged | 1.4401 | Forged counterpart for cover and small components | Cover, drain plug, high-strength small components |
| A182-F316L | SS316L forged | 1.4404 | Forged low-carbon counterpart, best weldability | Cover, drain plug for high-purity corrosive service |
Reference: ASTM A351, ASTM A182, EN 10213, EN 10283. CF8M is the standard body material for ANSI CF8M Y strainers; CF3M is selected for pharmaceutical, food and welded high-purity service. Forged A182-F316 / F316L is used for the cover and drain plug.
A351-CF8M Y Strainer Screen Selection: Perforated Plate vs Wire Mesh
| Screen Type | Opening Size | Material | Typical Application |
|---|---|---|---|
| Perforated Plate | 1mm, 2mm, 3mm, 4mm, 5mm | SS316, SS316L, DSS | Coarse filtration, high dirt load, large debris removal in refinery and seawater lines |
| Wire Mesh | 10, 20, 40, 60, 80, 100 mesh | SS304, SS316 | Fine filtration, pump and instrument protection in chemical and petrochemical service |
| Combined Screen | Perforated plate + wire mesh | SS304, SS316, SS316L | High dirt load with fine filtration requirement, common in refinery and offshore main lines |
Reference: ASME B16.34, API 598. Perforated plate is standard for large diameter and high dirt load service; wire mesh is used where finer filtration is required. Combined screens are commonly specified for refinery and offshore main lines.
Main Parts and Material List For A351-CF8M Y Type Strainer
| No. | Part Name | Material |
|---|---|---|
| 01 | Body | A351-CF8M (1.4408) / A351-CF3M (1.4404) |
| 02 | Screen | 316SS, 316LSS, DSS (2205 / 2507) |
| 03 | Gasket | Graphite + Stainless Steel (304SS, 316SS); PTFE optional |
| 04 | Cover | A182-F316 / A182-F316L |
| 05 | Bolt | A193 B8M |
| 06 | Nut | A194 8M |
| 07 | Drain Plug | A182-F316 / A182-F316L |
Reference: ASME B16.34, API 598, ASTM A351, ASTM A182. Materials may vary by model and pressure rating. Contact us for confirmed material certificate to EN 10204 3.1.
A351-CF8M Y Type Strainer Applications
• Chemical and petrochemical: reagent feed lines, corrosive media filtration, and process piping with CF8M body for ASME standard plants.
• Refinery and oil and gas: hydroprocessing, sour gas and amine service requiring chloride resistance in Class 300 to 900.
• Offshore and marine: seawater cooling, offshore process piping and platform service with CF8M body and DSS screen.
• Seawater and desalination: reverse osmosis intake lines, seawater injection and desalination piping requiring high chloride resistance.
• Pulp and paper: bleach plant, chlorine dioxide and corrosive chemical service with SS316 body.
• Pharmaceutical and food processing: high-purity reagent, solvent and hygienic filtration with CF3M (SS316L) body on request.
FAQ - Stainless Steel A351-CF8M Y Type Strainer
Q1: What is A351-CF8M cast stainless steel?
A: A351-CF8M is an ASTM standard cast stainless steel grade defined in ASTM A351. It corresponds to SS316 wrought material and contains approximately 18% chromium, 10% nickel and 2-3% molybdenum. The molybdenum content provides excellent resistance to chloride pitting, crevice corrosion and general corrosion, making CF8M suitable for chemical, petrochemical, offshore and seawater service. It is equivalent to EN-GX5CrNiMo19-11-2 (EN 1.4408) in European standard and GB ZG0Cr18Ni12Mo2 in Chinese standard. Service temperature range is -29°C to 425°C.
Q2: What is the difference between A351-CF8M and A351-CF3M?
A: CF8M (SS316, EN 1.4408) is the standard Mo-bearing cast stainless steel, widely used for chemical and offshore service. CF3M (SS316L, EN 1.4404) is the low-carbon version of CF8M, with carbon content limited to 0.03% maximum. The lower carbon content of CF3M prevents chromium carbide precipitation during welding, providing better resistance to intergranular corrosion in the heat-affected zone. CF3M is preferred for welded strainer bodies, pharmaceutical and food service, and high-purity chemical applications. For non-welded or general chemical service, CF8M is more economical and equally effective.
Q3: What pressure ratings are available for A351-CF8M Y strainers?
A: A351-CF8M Y strainers are available in ANSI Class 150, 300, 600 and 900, with design pressures of 19.6 bar (285 psi), 51 bar (740 psi), 102 bar (1,480 psi) and 153 bar (2,220 psi) respectively, in accordance with ASME B16.34. Class 300 is the most common rating for chemical and petrochemical process piping; Class 150 is used for low-pressure corrosive water and chemical feed; Class 600 and 900 are selected for high-pressure refinery, sour gas and offshore service. Flange dimensions follow ASME B16.5 for each class.
Q4: What is the difference between perforated plate and wire mesh screens for CF8M Y strainers?
A: Perforated plate screens are made from a stainless steel plate with punched holes of 1mm to 5mm, providing high mechanical strength and high dirt holding capacity. They are used for coarse filtration and large debris removal in refinery, seawater and large diameter pipelines. Wire mesh screens are woven from SS304 or SS316 wire with 10 to 100 mesh openings, providing finer filtration for pump and instrument protection. Combined screens (perforated plate + wire mesh) are often specified for refinery and offshore main lines where both high dirt load and fine filtration are required.
Q5: What is the size range and end connection available?
A: A351-CF8M Y strainers are available from 2 inch to 24 inch (DN50 to DN600). End connections include Flanged FF (Flat Face) and Flanged RF (Raised Face) to ASME B16.5. Face-to-face dimension follows ASME B16.10. Drain connection is available as plug or flange. For sizes above 24 inch, a special fabricated design may be evaluated; please contact us with your specific requirement.
Q6: How do I maintain an A351-CF8M Y strainer?
A: A351-CF8M Y strainer maintenance is simple: isolate the strainer, depressurize, remove the cover bolts (bolted cover design), take out the screen, clean or replace it, install a new gasket (graphite or PTFE), and reassemble. The Y-shaped body allows screen removal without disconnecting the pipeline. For continuous chemical or offshore operation, a bypass line or dual-strainer configuration is recommended. Screen replacement is recommended when the pressure drop exceeds the initial clean-screen value by 0.5-1.0 bar. After maintenance, pressure test is recommended before returning to service.
Request a Quote for Stainless Steel A351-CF8M Y Type Strainer
Send us your size, pressure rating (CL150 / CL300 / CL600 / CL900), body material (CF8M or CF3M), end connection (FF / RF), screen type (perforated plate or wire mesh), mesh size, drain connection type, and quantity. Our team will reply within 24 hours with price, drawing, and delivery time.
Email: sales@tengsvalve.com
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