Question 1

What mesh size for steam strainer vs water strainer?

Accepted Answer

Steam strainers use: 30-mesh (588 micron) for main steam lines to prevent scale and pipe rust from entering traps and meters; 60-mesh (250 micron) for instrument air and control steam where finer protection is needed. The larger mesh for steam accounts for larger particle sizes expected and higher velocities. Water strainers use: 40-mesh (400 micron) for general service, 60-mesh (250 micron) for cooling water and process water, 80-mesh (180 micron) for fine filtration of metering and pump suction. For Saudi Arabian seawater cooling, 40-mesh is standard for pump protection; for instrument air, 60-mesh prevents nozzle blocking. Mesh selection must also consider pressure drop - finer mesh increases differential pressure.

Question 2

Y-strainer vs basket strainer - which for duplex filtration?

Accepted Answer

Y-strainers have a screening element shaped like a Y, suitable for horizontal or vertical pipelines with limited space. They handle lower flow rates and smaller pipe sizes (to 14 inches typically). Basket strainers have a large basket element in a pot-style body, providing 3-5x more screen area than Y-strainers. For duplex (two basket) strainers with diverter valve, they allow online cleaning - one basket in service while other is cleaned. For Saudi Arabian water treatment: Y-strainer for instrument lines and small flows; duplex basket strainer for pump suction and large flows where online maintenance is required. Basket strainers also handle viscous fluids better due to larger screen area.

Question 3

How to select strainer for protecting pump suction?

Accepted Answer

Pump suction strainer selection: (1) Open area ratio (screen area / pipe area) should be minimum 3:1 to minimize pressure drop - typically 4:1 for good practice, (2) Free strainer area (mesh open area) = mesh percent x open area ratio, (3) Select mesh based on pump tolerance: 40-mesh for general water pumps (0.5mm tolerance), 80-mesh for ANSI/Hydraulic Institute standards pump, (4) For Saudi Arabian seawater pumps (Samsung, KSB), specify minimum 40-mesh with 4:1 open area ratio. Basket strainers are preferred over Y-strainers for pump suction due to larger capacity. Provide differential pressure gauge to signal when cleaning is needed - typically 10-15 PSI differential.

Question 4

What is blow-down valve connection for strainer?

Accepted Answer

Blow-down (blow-off) connection is a threaded outlet at the strainer low point for draining debris and flushing fluid during maintenance. Standard blow-down sizes: 1/2 inch NPT for strainers to 2 inch, 3/4 inch for 2-4 inch strainers, 1 inch for larger. For Saudi Arabian steam service, blow-down is essential for removing scale and rust. The blow-down valve (typically a ball valve or needle valve) should be full port to allow complete draining. In Riyadh district heating, blow-down is routed to a flash tank for steam recovery. Never install a strainer without blow-down capability in steam or dirty water service.

Body / Disc / Wetted Parts Material	Nickel-Aluminium-Bronze (NAB), ASTM B148 Alloy C95800 (CuAl10Fe5Ni5), sand cast
Fluid / Service	Sea water (all 7 items)
Material Certification	EN 10204 3.1 Material Test Certificate (chemical composition: Cu, Al, Fe, Ni, Mn per ASTM B148)
Pressure Testing	Hydrostatic shell & seat test as per item-wise test pressures specified (refer Scope of Supply)
Butterfly Valve Design Standard	API 609 / EN 593, wafer type, EPDM resilient seat
Flange / Mating Standard (proposed)	EN 1092-1 PN10 (to be confirmed against your piping class)
Applicable Reference Standards	ASTM B148, EN 1092-1, EN 12266-1, API 598, IS 1538, JIS F 7301

Item 1 - 125mm NAB Pressure Reducing Valve	Flanged, NAB body, working range -0.8 to 2 bar, Sea water - Qty 1
Item 2 - 80mm NAB Butterfly Valve (Lever)	Wafer, NAB body/disc, EPDM seat, 20 kg/cm² test, Sea water - Qty 1
Item 3 - 40mm NAB Butterfly Valve (Lever)	Wafer, NAB body/disc, EPDM seat, 20 kg/cm² test, Sea water - Qty 1
Item 4 - 250mm NAB Butterfly Valve (Gear)	Wafer, NAB body/disc, EPDM seat, 20 kg/cm² test, Sea water - Qty 4
Item 5 - 80mm NAB SDNR Valve (Straight)	NAB body & internals, 20 kg/cm² test, Sea water - Qty 1
Item 6 - 40mm NAB Relief Valve	NAB body & internals, set 2.5 bar, Sea water - Qty 1
Item 7 - 250mm NAB Bucket Strainer	NAB body, SS316 perforated basket, 20 kg/cm² test, Sea water - Qty 2

Parameter	Value
Size Range	1/2" to 24"
Pressure Rating	150# to 2500#

Size Range	1/2" to 48" (DN15 to DN1200)
Pressure Rating	Class 150 to 2500 (PN10 to PN420)
Body Materials	WCB, CF8M, CF3M, Duplex SS, NAB
Trim Materials	SS304, SS316, SS316L, Stellite, Inconel
End Connections	Flanged RF/FF/RTJ, Threaded, SW, BW
Standards	API 600/602/603/608/609, ASME B16.34, BS 1873
Temperature Range	-196°C to +550°C
Face to Face	ASME B16.10, EN 558, API 609

Vizag Trading Mfg Co Vtmc Bucket Type Strainer

Detailed Specifications

General Specifications - All Items

Item-wise Technical Summary

Technical Specifications

Materials of Construction

Carbon Steel

Stainless Steel

Alloy Steel

Request a Quote

Features & Benefits

Feature 1

Feature 2

Request Detailed Enquiry

Technical Specifications

Industries & Applications

Why Source from Supreme Valves India?

Installation & Maintenance