Body and Code
Fabricated bodies designed to ASME B31.1 and/or ASME VIII Div. 1, 150 psig at 150 °F (10.3 barg at 65.6 °C) for the standard range, and pressure tested before dispatch. Higher pressures and temperatures are designed to order.
Pipeline strainers
LEAKPROOF Simplex Basket Strainer
A basket strainer keeps solids out of the pumps, meters, valves and heat exchangers downstream: weld slag, scale, stones, fibres or anything else the pipeline carries. The liquid flows into a removable basket and out through its perforated wall, so the debris stays in the basket until it is lifted out and emptied. LEAKPROOF simplex basket strainers are fabricated in Malaysia in carbon or stainless steel, with a basket that seats on a machined seat so nothing flows around it, for water, oil, process liquids and gas.
2 to 12 instandard sizes; larger built to order
150 to 600 lbANSI B16.5 flanged or butt-weld
3 mm holesstandard perforated basket; mesh linings on request
CS, SS304, SS316and other alloys on request
Inside the strainer
What Is Inside a LEAKPROOF Basket Strainer
Loading the 3D model…
1
Bolted Cover
A flat cover on studs and nuts, with a lifting lug. Quick-opening covers with hinged eye bolts are available for baskets that are cleaned often.
2
Inlet Nozzle
Flanged to ANSI B16.5, in line with the outlet, so the strainer fits straight into the pipe run. Butt-weld ends on request.
3
Cover Gasket
A gasket or O-ring in EPDM or Viton seals the cover on the body flange.
4
Basket
A perforated stainless steel basket, 3 mm holes as standard, with a slanted top that faces the inlet. It holds the debris and comes out by its handle.
5
Mesh Lining
A woven mesh inside the perforated basket, from 20 to 200 mesh, for a finer cut. The perforated plate carries it and it can be replaced on its own.
6
Basket Seat
A machined seat between the inlet and the outlet. The rim of the basket lands on it, so all the liquid has to pass through the basket and none can bypass it.
7
Strainer Body
A fabricated shell in carbon steel, SS304 or SS316, designed to ASME B31.1 or ASME VIII Div. 1 and pressure tested.
8
Outlet Nozzle
The strained liquid leaves below the seat, through a flanged outlet on the same centre line as the inlet.
9
Vent
A plugged port on the cover lets the air out when the strainer fills, and can take a pressure gauge.
10
Drain
A threaded drain at the bottom, from 1/4 to 3/4 inch, empties the body before the cover is opened. Flanged drains on request.
How it works
Six Steps from Inlet to Clean Basket
A basket strainer works on a simple principle: the liquid enters the basket from above and leaves through its wall, from the inside out. Anything larger than the holes stays in the basket, and because the basket is closed at the bottom, the debris goes out with it when it is cleaned and never falls back into the clean side. The diagram and the six steps below follow the liquid through a simplex strainer.
Step 1 of 6: Into the BasketThe liquid enters through the inlet, above the seat, and flows down into the open top of the basket.
Liquid with debrisStrained liquidDebris held in the basketAir
1
Into the Basket
The liquid enters through the inlet, above the seat, and flows down into the open top of the basket.
2
Out Through the Wall
It passes through the perforated wall and the mesh lining, from the inside out, and leaves through the outlet below the seat.
3
Debris Stays Inside
Particles larger than the openings are held in the basket and settle at its bottom.
4
Watch the Pressure Difference
As the basket fills, the pressure difference between the inlet and the outlet rises: a gauge on each side, or a differential gauge, shows when the basket is due for cleaning.
5
Isolate and Drain
The line is stopped and the valves on each side are closed; the body is vented and drained.
6
Clean the Basket
The cover comes off, the basket is lifted out by its handle, emptied and put back on its seat, and the line starts again.
Perforation or mesh. For protecting a pump, the standard 3 mm perforated basket is usually enough. A mesh lining gives a finer cut, but a finer screen than the duty needs only fills sooner, so choose the opening by what the equipment downstream has to be protected from.
Why the seat matters. A strainer is only as good as its seal: if the basket does not seat, liquid flows around it and even the finest mesh gives no protection. That is why the basket of a LEAKPROOF strainer lands on a machined seat.
A line that must not stop? A simplex strainer is cleaned with the line shut down. Where the flow has to continue, a duplex strainer switches to its second basket while the first one is cleaned.
Design and construction
Built in Malaysia to ASME Standards
Leakproof Seat
The basket rim lands on a machined seat between the inlet and the outlet, so nothing can flow past the basket.
Covers
A bolted flat cover with a lifting lug as standard; quick-opening covers with hinged eye bolts, and a swing-arm davit for heavy covers, on request.
Baskets
Heavy-duty perforated stainless steel baskets with a slanted top and a lifting handle: 3 mm holes as standard, or 1/32, 1/16 and 1/8 inch, plain or lined with 20 to 200 mesh.
Connections
ANSI B16.5 flanges, RF, FF or RTJ, or butt-weld ends; ANSI 150, 300 and 600 lb. JIS and DIN flanges on request.
Materials
Carbon steel, SS304 or SS316 bodies; duplex stainless steel, Alloy 20, Hastelloy C276 and Monel on request. Internal coatings and linings available.
Drain and Vent
A threaded or flanged drain at the bottom and a vent on the cover. Blowdown connections and extra vents where the duty needs them.
Options
Differential pressure gauges, custom nozzle positions, oversized bodies for a larger screen area, floor stands and special coatings or galvanizing.
Testing and Documents
Hydrostatic test on every strainer, a fixed part of our QC; dye penetrant, radiographic, ultrasonic wall thickness, magnetic particle and positive material identification, EN 10204 3.1 material certificates, a certificate of conformance and pickling and passivation of stainless steel when the specification asks for them.
Applications
What Simplex Basket Strainers Are Used For
A simplex basket strainer protects equipment on lines that can be stopped for a short time to clean the basket. Plants choose a basket strainer rather than a Y-strainer when the line is larger or carries more debris, because the basket holds much more and is easy to lift out. These are the usual duties.
Pump Protection
Suction and discharge lines
On the suction side of a pump, a basket strainer stops stones, weld slag and scale before they reach the impeller and the seals.
Meters and Control Valves
Custody transfer and dosing
Flow meters, control valves and spray nozzles need clean liquid to stay accurate and to seal; the strainer catches what would wear or block them.
Heat Exchangers
Plate and shell-and-tube
A strainer in front of a heat exchanger keeps debris out of the narrow channels and tubes, where it would block the flow.
Edible Oil and Palm Oil
Refineries, mills and tank farms
Crude and refined oil lines, transfer and loading pumps, and the lines into storage tanks.
Oil, Fuel and Chemicals
Process plants and terminals
Fuel oil, diesel, solvents and process liquids, in carbon or stainless steel to suit the liquid.
Water Systems
Cooling, sea and fire water
Cooling-water, sea-water, process-water and fire-water lines, where sand, shells and scale would damage pumps and nozzles.
Where It Sits in a Line
Tank or line
liquid with some debris
Isolation valve
closed to clean the basket
Basket strainer
catches the debris
Isolation valve
closed to clean the basket
Pump
protected from stones and slag
Meter, valve or exchanger
clean liquid downstream
Valves on both sides let the strainer be isolated and drained for cleaning; a pressure gauge on each side, or a differential gauge, shows when the basket is due.
When a Simplex Basket Strainer Is the Right Choice
- Larger lines, from 2 inches up, or lines that carry a fair amount of debris.
- Protection of pumps, meters, valves and heat exchangers from particles they cannot pass.
- A line that can be stopped for a few minutes to lift out and empty the basket.
- Liquids that need a basket in stainless steel, or a body in carbon or stainless steel to match the pipe.
When Another Strainer Is Better
- A line that must not stop: a duplex basket strainer.
- Small lines, steam or gas, or a strainer in a vertical or tight run: a Y-strainer.
- Debris that comes only once, at commissioning: a temporary cone, basket or plate strainer between flanges.
- Fine particles that must be filtered out, not just kept away from the pump: a bag or cartridge filter.
For a line that must keep running see the LEAKPROOF duplex basket strainer; for small lines, steam and gas, the LEAKPROOF Y-strainer; for commissioning, temporary cone, basket and plate strainers; for fine particles, the LEAKPROOF polishing filter.
LEAKPROOF basket strainers are fabricated and tested in our works in Malaysia for edible oil and oleochemical plants, refineries, LNG and petrochemical plants, tank terminals, power and water plants and shipyards, mostly through the contractors who build them, in Malaysia, Singapore and Indonesia, from small batches to large strainers built to a project specification.
Models and dimensions
Sizes, Types and Dimensional Data
The standard range covers 2 to 12 inches with ANSI 150 lb flanges; larger sizes, 300 and 600 lb ratings, butt-weld ends and other layouts are built to order. We size each strainer for the flow, the liquid and the debris it has to hold.
In-Line Simplex Strainer, LPFSB
Inlet and outlet on one centre line, a slant-top basket under a bolted cover: the standard design in the table below.
Quick-Opening Cover
Hinged eye bolts that swing out, for baskets that are cleaned often; a davit carries heavy covers.
Tee and Special Strainers
Tee, angle and long in-line bodies built to a project drawing, up to 24 inches and larger.
Dimensional Data, LPFSB
| Size (in) | A (mm) | B (mm) | C (mm) | D* (mm) | Drain (NPT) |
|---|---|---|---|---|---|
| 2 | 299 | 305 | 203 | 476 | 1/4 in |
| 3 | 330 | 352 | 216 | 686 | 1/2 in |
| 4 | 406 | 352 | 216 | 686 | 1/2 in |
| 5 | 406 | 381 | 238 | 762 | 1/2 in |
| 6 | 508 | 422 | 260 | 812 | 1/2 in |
| 8 | 558 | 530 | 336 | 1042 | 3/4 in |
| 10 | 660 | 654 | 431 | 1270 | 3/4 in |
| 12 | 762 | 759 | 501 | 1473 | 3/4 in |
A: face to face of the flanges. B: height of the strainer. C: base to the centre line of the nozzles. D*: height needed to lift the basket out. The 3 and 4 inch strainers share the 6-inch body, so B, C and D* are the same. ANSI B16.5 flanges, bolt holes straddling the centre lines; all dimensions in mm.
Standard Specification
| Body | Carbon steel, SS304 or SS316 (other alloys on request) |
| Design code | ASME B31.1 and/or ASME VIII Div. 1 |
| Design pressure and temperature | 150 psig at 150 °F (10.3 barg at 65.6 °C); higher on request |
| Connections | ANSI B16.5 flanged, RF, FF or RTJ, 150, 300 or 600 lb; butt-weld on request |
| Basket | Perforated stainless steel, 3 mm holes standard; 1/32, 1/16 or 1/8 inch |
| Mesh lining | 20 to 200 mesh |
| Gasket or O-ring | EPDM or Viton |
| Drain | Threaded NPT, 1/4 to 3/4 inch; flanged on request |
| Tests | Hydrostatic on every strainer; DP, RT, UT, MPI and PMI on request |
Dimensions are for the standard strainers and may change; the general arrangement drawing sent with each quotation gives the certified dimensions and weights.
Spares and re-meshing
Baskets, Mesh Linings and Spares
Baskets and their mesh linings are the parts a strainer uses up. We make them in our own works for our strainers and for other makes, to a drawing or a sample, and re-mesh worn baskets.
Replacement Baskets
Perforated baskets with slanted or flat tops and lifting handles, made to fit your strainer body.
Mesh Baskets and Linings
Woven mesh baskets and linings from 20 to 200 mesh, made to size and wrapped for dispatch.
Spare Baskets
A second basket on the shelf means the strainer is back in service as soon as the cover is on.
Elements for Other Makes
Cone, basket and special elements for strainers of other makes, from a sample or drawing.
FAQ
Frequently Asked Questions
What does a basket strainer do?
It keeps solids such as weld slag, scale, stones and fibres out of pumps, meters, valves and heat exchangers. The liquid flows into a removable basket and out through its perforated wall, and the debris stays in the basket until it is emptied.
Basket strainer or Y-strainer: which do I need?
A basket strainer holds far more debris and is easier to clean, so it suits larger lines and dirtier liquids. A Y-strainer is more compact and suits small lines, steam and gas, and pipes in any position. Tell us the line size, the liquid and the debris, and we will recommend one.
How do I choose the perforation or mesh?
By what the equipment downstream must be protected from. The standard 3 mm perforated basket protects most pumps; a mesh lining gives a finer cut for meters, nozzles or close-clearance pumps. A finer screen than needed only makes the basket fill sooner.
When should the basket be cleaned?
When the pressure difference between the inlet and the outlet reaches the value set for your line, read on a gauge on each side or on a differential gauge. If the difference drops suddenly, check the basket: a damaged screen or a basket that is not seated lets debris through.
Can a simplex strainer be cleaned without stopping the line?
No. The strainer is isolated by the valves on each side, vented and drained before the cover is opened. For a line that has to keep running, choose a duplex strainer, which changes over to a clean basket while the other is cleaned.
What makes a LEAKPROOF strainer leakproof?
The basket rim lands on a machined seat, so no liquid can flow past the basket, and the cover seals on a gasket or O-ring. Every strainer is pressure tested before it leaves our works.
Which materials and pressure ratings are available?
Carbon steel, SS304 and SS316 as standard, and duplex stainless steel, Alloy 20, Hastelloy and Monel on request. ANSI 150, 300 and 600 lb flanges; higher ratings and butt-weld ends are designed to order.
Do you make baskets for other makes of strainer?
Yes. Send a drawing, a sample or the main dimensions, the perforation or mesh you need and the material, and we will make new baskets or re-mesh your old ones.
Need a Quote or a Sizing Check?
Send us your duty, a drawing or a photo of your existing unit. A Peltech engineer will reply with options and a quotation.