Name: Bucket Strainer 6 Inch Flanged Class 150
Brand: Supreme Valves India
SKU: BSTR-6IN-150
Availability: InStock
Rating: 4.8 (127 reviews)

Question 1

What is the difference between a Y-type strainer and a basket (bucket) strainer?

Accepted Answer

Y-type and basket (bucket) strainers differ in design, capacity, and maintenance approach. Y-type strainers have a Y-shaped body with the screen element forming one leg of the Y. They are compact and suitable for smaller pipe sizes (1/2" to 4") and for applications where the collected debris volume is low. The blow-off cap allows cleaning without removal. Basket strainers have a rectangular or cylindrical 'basket' element that hangs within the strainer body — offering significantly larger screen surface area and debris-holding capacity. Basket strainers are preferred for: large pipe sizes (above DN100/4"), high-solids applications (raw water, cooling towers, river intake), and where longer intervals between cleaning are desired. The basket is removed for cleaning rather than blown off.

Question 2

What is the maximum working pressure of a 6 inch Class 150 cast iron strainer?

Accepted Answer

A 6-inch Class 150 cast iron (ASTM A126B) strainer is rated for a maximum working pressure of 285 PSI (19.6 bar) at 38°C per ASME B16.42 (the standard for Class 125 and Class 250 cast iron flanged fittings). At 200°C, the rating reduces to approximately 180 PSI. For comparison, a ductile iron (ASTM A395) strainer at the same rating can handle approximately 480 PSI at 38°C due to ductile iron's higher yield strength, making it preferred for higher-pressure applications or where pressure surges are expected.

Question 3

What screen perforation options are available for a 6 inch strainer?

Accepted Answer

For a 6-inch (DN150) strainer, standard screen perforation options range from 0.5mm to 5.0mm. For raw water intake: 3.0mm to 5.0mm (coarse). For cooling tower water: 1.0mm to 2.0mm (medium). For boiler feedwater and steam: 0.5mm to 1.0mm (fine). For instrument air: 40-mesh to 100-mesh (very fine). The screen is typically constructed from SS304 for general service and SS316L for corrosive or offshore environments. The screen area of a 6-inch basket strainer is typically 3–5× the pipe cross-sectional area, providing low pressure drop even at high solids loading.

Question 4

Is a 6 inch strainer considered a 'bucket' strainer?

Accepted Answer

The term 'bucket strainer' refers specifically to a strainer with a basket-shaped screen element that captures debris in a collection chamber — not a Y-shaped screen. For a 6-inch (DN150) strainer, both Y-type and basket designs are available, but the basket design is far more common at this size due to its superior debris-holding capacity. A Y-type 6-inch strainer has a significantly larger body than a 4-inch but the basket design provides 3–4× more screen area. For the inquiry's 'Bucket Strainer' specification, we recommend a basket-type design for DN150.

Question 5

What applications is a 6 inch Class 150 strainer typically used for?

Accepted Answer

A 6-inch Class 150 strainer is typically used in: cooling water systems for power plants and industrial facilities (cooling tower sump pumps, condenser water), municipal water treatment plant intake screens (raw water from reservoirs or rivers), fire protection systems (suction strainers for fire pumps), process water supply lines for refineries and chemical plants, and steam boiler feedwater pre-filtration. At 6-inch size, it is typically installed on pump suction lines, main header isolation points, and upstream of flow meters or control valves that require clean water.

Question 6

What are the export and shipping details for 6 inch strainers?

Accepted Answer

6-inch Class 150 strainers are shipped individually in strong wooden crates (ISPM 15 compliant). Typical crate dimensions: 600mm × 600mm × 500mm. Weight per unit: 18–25 kg depending on body material (cast iron vs. ductile iron). Sea freight from Nhava Sheva (JNPT), Mumbai to worldwide ports. Production schedule: 2–3 weeks for standard materials. For IBR certification (required for boiler connections in India), add 5–7 working days. We can also supply with BSP threaded blow-off connections or flanged blow-off as required. EN 10204 3.1 material certificates included as standard.

Component	Material Specification
Body & Bonnet	Ductile Iron (ASTM A536 / EN-GJS-400-15)
Stem / Spindle	SS 410 / SS 420
Seat / Trim	EPDM / NBR / Bronze

Parameter	Specification / Standard
Manufacturing / Design Standard	EN 1171 / AWWA C509 / BS 5163
Testing Standard	API 598 / EN 12266-1
Pressure Rating	PN16 / PN25

Strainer Valve 6-Inch

Bucket Strainer — 6" Class 150 Flanged

Strainer Type Selection — Y-Type vs. Basket (Bucket)

Y-Type Strainer

Basket (Bucket) Strainer — Recommended for 6"

Materials of Construction (MOC)

Technical Specifications