A351-CF8 Cast Steel Y Strainer 150Lb - SS304, PN20, 2 inch to 24 inch, FF RF Flanged
Tengs Valve supplies high-quality A351-CF8 Cast Steel Y Strainers for ANSI Class 150Lb / PN20 service, manufactured with bolted cover design and available with flanged FF or RF ends to ASME B16.5. Body is cast stainless steel A351-CF8 (SS304), equivalent to EN-GX5CrNi18-10 (1.4308), with forged stainless steel A182-F304 / F304L cover. Sizes range from 2 inch to 24 inch (DN50 to DN600). Screens are supplied in stainless steel 304 and 316, 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 water treatment, food and beverage, pharmaceutical, HVAC and general chemical service in ASME standard piping systems.
CF8 Y Strainer Specification
• Strainer Type: Y Type, Y Pattern
• Sizes: 2 inch to 24 inch (DN50 to DN600)
• Pressure Rating: ANSI 150Lb / PN20
• Body Material: Cast Stainless Steel A351-CF8 (SS304)
• EN Equivalent: CF8 = EN 1.4308
• Strainer Screen: Stainless Steel 304, 316 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-CF8 (SS304) stainless steel Y strainer provides cost-effective corrosion-resistant filtration for water, food and general chemical service in ANSI Class 150
CF8 Y Strainer Pressure Rating Comparison: CL150 vs PN20 vs CL300
| Pressure Rating | Design Pressure (bar) | Design Pressure (psi) | Typical Application |
|---|---|---|---|
| ANSI CL150 | 19.6 | 285 | Water treatment, food and beverage, HVAC, general chemical service |
| PN20 | 20 | 290 | Equivalent metric rating for Chinese and European projects |
| ANSI CL300 | 51 | 740 | Medium-pressure chemical and process piping, higher pressure corrosive media |
Reference: ASME B16.34, GB/T 12224. ANSI CL150 and PN20 are widely regarded as equivalent ratings for stainless steel Y strainers in international projects. Class 150 is the standard choice for low-pressure water, food and general chemical service.
A351-CF8 Stainless Steel Material Selection: CF8 vs CF3 vs CF8M vs CF3M
| ASTM Grade | Equivalent | EN Material Number | Key Characteristic | Typical Application |
|---|---|---|---|---|
| A351-CF8 | SS304 | 1.4308 | General corrosion resistance, most economical stainless steel | Water treatment, food and beverage, HVAC, general chemical |
| A351-CF3 | SS304L | 1.4306 | Low-carbon, better weldability and intergranular corrosion resistance | Welded construction, food and pharmaceutical, nitric acid service |
| A351-CF8M | SS316 | 1.4408 | Mo-bearing, better chloride and pitting resistance | Chemical, marine, pharmaceutical, chloride-containing media |
| A351-CF3M | SS316L | 1.4404 | Low-carbon + Mo-bearing, best corrosion resistance and weldability | Pharmaceutical, high-purity chemical, desalination, welded service |
Reference: ASTM A351, EN 10213, EN 10283. CF8 is the most economical stainless steel grade for Class 150 Y strainers, suitable for non-chloride corrosive service; CF8M and CF3M are selected for chloride, high-purity and pharmaceutical service.
A351-CF8 Y Strainer Screen Selection: Perforated Plate vs Wire Mesh
| Screen Type | Opening Size | Material | Typical Application |
|---|---|---|---|
| Perforated Plate | 1mm, 2mm, 3mm, 4mm, 5mm | SS304, SS316 | Coarse filtration, high dirt load, large debris removal in water and chemical lines |
| Wire Mesh | 10, 20, 40, 60, 80, 100 mesh | SS304, SS316 | Fine filtration, pump and instrument protection in water, food and chemical service |
| Combined Screen | Perforated plate + wire mesh | SS304, SS316 | High dirt load with fine filtration requirement, common in food and pharmaceutical service |
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 food and pharmaceutical main lines.
Main Parts and Material List For A351-CF8 Y Strainer
| No. | Part Name | Material |
|---|---|---|
| 01 | Body | A351-CF8 (1.4308) / A351-CF3 (1.4306) |
| 02 | Screen | 304SS, 316SS |
| 03 | Gasket | Graphite + Stainless Steel (304SS, 316SS); PTFE optional |
| 04 | Cover | A182-F304 / A182-F304L |
| 05 | Bolt | A193 B8 |
| 06 | Nut | A194 8 |
| 07 | Drain Plug | A182-F304 |
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-CF8 Y Strainer Applications
• Water treatment and distribution: municipal water networks, RO pretreatment, pump suction and discharge protection with SS304 body.
• Food and beverage: hygienic stainless steel service, sugar, brewing, dairy and soft drink processing requiring SS304 wetted parts.
• Pharmaceutical: purified water, WFI, and non-chloride reagent filtration with CF3 (SS304L) body on request.
• HVAC and building services: chilled water, hot water and low-pressure steam distribution requiring corrosion-resistant body.
• General chemical: non-chloride corrosive media filtration, dilute acid and alkali service with SS304 or SS316 screen.
• Pulp and paper: white water, paper machine and non-chloride chemical service with SS304 body and perforated plate screen.
FAQ - A351-CF8 Cast Steel Y Strainer 150Lb
Q1: What is A351-CF8 cast stainless steel?
A: A351-CF8 is an ASTM standard cast stainless steel grade defined in ASTM A351. It corresponds to SS304 wrought material and contains approximately 18% chromium and 8-10% nickel. CF8 offers excellent general corrosion resistance and is the most economical stainless steel grade for Class 150 Y strainers. It is equivalent to EN-GX5CrNi18-10 (EN 1.4308) in European standard and GB ZG0Cr18Ni9 in Chinese standard. Service temperature range is -29°C to 425°C. CF8 is suitable for non-chloride corrosive service such as water, food, dilute acid and general chemical applications.
Q2: What is the difference between A351-CF8 and A351-CF8M?
A: CF8 (SS304, EN 1.4308) contains chromium and nickel but no molybdenum, offering general corrosion resistance at the lowest cost. CF8M (SS316, EN 1.4408) adds 2-3% molybdenum, providing significantly better resistance to chloride pitting, crevice corrosion and marine environments. CF8 is selected for non-chloride service such as water, food and general chemical, while CF8M is preferred for chloride-containing media, seawater, marine and pharmaceutical service. For Class 150 low-pressure water and food applications, CF8 is the most economical choice; for chloride or offshore service, CF8M should be specified.
Q3: Is ANSI Class 150 equivalent to PN20 for stainless steel Y strainers?
A: ANSI Class 150 (19.6 bar / 285 psi) and PN20 (20 bar / 290 psi) are widely regarded as equivalent pressure ratings in international projects, with nearly identical design pressures at ambient temperature. Both are suitable for low-pressure water, food and general chemical service. Flange dimensions and bolt pattern differ between the two standards: PN20 follows DIN EN 1092-1, and ANSI Class 150 follows ASME B16.5. Please specify the standard when requesting a quotation. For higher pressure, Class 300 or PN40 are available.
Q4: What is the difference between perforated plate and wire mesh screens for CF8 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 water treatment, food 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 food and pharmaceutical main lines where both high dirt load and fine filtration are required.
Q5: What is the size range and end connection available?
A: A351-CF8 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-CF8 Y strainer?
A: A351-CF8 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 water or food processing 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. For food and pharmaceutical service, clean or replace the screen after each CIP cycle.
Request a Quote for A351-CF8 Cast Steel Y Strainer 150Lb
Send us your size, pressure rating (CL150 or PN20), body material (CF8 or CF3), 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.
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