Wedge Wire Screen, Run Down Screens, V Wire Screen Pipe, Vessel Internals, Cylindrical Screen, Vadodara, Gujarat, India

WHAT IS A WEDGE WIRE SCREEN ?

home WHAT IS A WEDGE WIRE SCREEN ?

WHAT IS A WEDGE WIRE SCREEN ?

It is a sieve made from looped wires formed into a deep wedge-shaped section.

Individual wedge wires are built into "Panels" by threading cross rods of suitable diameter through the loops. The whole is then clamped and made secure usually by riveting or putting ring nuts over the cross rod ends or by welding.

The Wedge Wire Screens can be supplied in various shapes and forms as per the requirements such as FLAT PANELS, CURVED SIEVE BENDS, CONICAL BASKETS, CYLINDERS, TROUGHS DISCS either in one piece or in segments. For curved, cylindrical and conical screens in most cases the cross rods lie along the circumfrance and profile wires run parallel to the axis.

Ocassionally this arrangement is reversed.

ADVANTAGES

Wedge Wire Screens provide a unique combination of the most important features required for maximum screening efficiency.

A. Free Clearance

The wedge-shaped sections of the wire form aperatures that become progressively wider in a downward direction, thus ensuring rapid flow of material through them. Clogged and blinded aperatures are reduced to an absolute minimum.

B. Lateral Strength

In our opinion no form of screening surface with apertures as fine as those of wedge wire screens, can compare with the mechanical strength and working efficiency of wedge wire.

C. Percentage Open Area

For a given aperature size, wedge wire screens have a much larger percentage of open area than conventinal sieves.

D. Wearing Life

Owing to a greater wearing area being provided by flat top surfaces, wedge wire screens retain their aperature for a longer duration than round wire screens.

* Some other advantages of Looped type of wedge wire screens over other type of screens and also other type of wedge wires are -

  • Self Supporting
  • High Abrasition resistance
  • Low pressure drop
  • High resistance to Vibration

Looped Wedge Wire Screen construction is particularly recommended when high Vibration resistance and fine accurate aperture are needed.

FRAMING AND REINFORCEMENT

Wedge wire easily lends itself to a variety of Screen Panel Constructions. Many different side finishes are available, some of which are given below :

  1. Cross rods riveted at both ends.
  2. Side angle.
  3. Single side flat.
  4. Spaced double side flats.
  5. Side rubber with ferrules.

The screens are reinforced with single reinforcing flat, double reinforcing flat and combination of single and double reinforcing flats welded to end flats. However framings should be as per fitment design in the deck. Customers are required to specify framing pattern h the order.

Special screens can be developed for customised applications not covered by metheods mentioned above.

WELDING :

A further method of strengthening a wedge wire screen panels, in addition to framing and reinforcements, against transverse bending is to put a run of weld along the bottom side of the loops. The weld run may be continuous along the whole length of the cross rod or skip or staggared welding may be employed.

SPACING LUGS :

In special cases involving side loading (Cross feed) on fine aperture wedge wire, specing lugs are introduced to give lateral support at points between the loops and shorten the unsupported span to maintain accuracy of the aperture.

MOUNTING OF WEDGE WIRE PANELS ON VIBRATING DECK FRAME :

While mounting of Wedge Wire Screen Panels, utmost care should be taken that all screen panels are rigidly fixed on the deck frame. The cover rail of Flats used for bolting the panels on the deck frame must not be put directly on the panel surface. Rubber packing in between must be provided.

Sufficiant rigid fixing is necessary so as not to develop any secondary vibration (flexing) under operation as this will result in premature failure of screen panels. To ensure the rigid fixing during opeartion periodical check of tightining bolts is recommended.

WEDGE WIRE GENERAL DATA ON APERTURES AND SECTIONS

APERTURE SECTION NUMBER APPROX. OPEN AREA %
0.10 mm 20 5.5
23 5.0
28 3.6
32 3.1
0.125 mm 20 6.7
23 6.0
28 4.8
32 4.4
0.25 mm 20 12.5
23 11.1
28 9.2
32 8.2
0.375 mm 20 16.5
23 15.0
28 12.7
32 11.3
0.40 mm 20 20.7
23 18.8
28 16.1
32 14.4
0.75 mm 23 25.2
28 21.9
32 19.8
1.0 mm 23 30.9
28 27.2
32 24.7
48 17.5
1.25 mm 35 26.9
1.3 mm 33 28.4
41 22.1
1.50 mm 23 38.8
28 34.7
35 30.2
49 23.4
1.75 mm 28 37.0 i
35 32.61
2.0 mm 39 32.81
49 27.41
63 24.81
2.5 mm 42 36.01
49 32.11
3.0 mm 44 38.5
51 35.9
54 34.9
4.0 mm 51 42.0
54 41.0
Over 4.0 mm Details on request

* Any aperture can be obtained on most of the profiles.

WEDGE WIRE - PROFILE DIMENSIONS

SECTION NUMBER PROFILE WIDTH mm PROFILE DEPTH mm
20 1.70 2.74
23 1.93 3.07
28 2.33 3.83
32 2.66 4.32
33 2.77 4.50
35 2.90 4.70
39 3.28 5.31
42 3.50 5.72
44 3.66 5.90
41 3.91 4.87
49 4.08 - j JS. 6.63
51 4.32 6.98
54 4.52 7.34

N.B.: Special profiles of wedge wire with slight variations in the profile depth and width can also be made.

MINI - WEDGE WIRE SCREENS :

Mini Wedge Wire is a development of standard Wedge Wire, complementing the micro fine range of apetrure. It is virtually the same in constructional details, each individual panel is built from looped and pressed wires assembled on threaded rods.

Mini Wedge Wire can be supplied with the following combination of aperture and cross rod.

APERTURE CROSS ROD DIA PITCH NO. OF LUGS WITHIN ONE PITCH
0.05mm (50 Micron) 5 dia 70/66mm 2
0.075 mm (75 Micron) 5 dia 70/66mm 2
0.10 mm (100 Micron) 5 dia 70/66mm 2

APERTURE CROSS ROD DIA PITCH
0.05mm (50 Micron) 3.2 dia 25.4mm
0.075 mm (75 Micron) 3.2 dia 25.4mm
0.10 mm (100 Micron) 3.2 dia 25.4mm

APERTURE CROSS ROD DIA PITCH
0.05mm (50 Micron) 4.80 dia 38.1mm
0.075 mm (75 Micron) 4.80 dia 38.1mm
0.10 mm (100 Micron) 4.80 dia 38.1mm

HOW TO ORDER WEDGE WIRE SCREENS

While sending your enquiry or order for wedge wire screens, it is most important to give information in full detail.

Not only does this ensure that the screens exactly correspond to the specifications laid down, but should there be an alternative make-up using perhaps a different profile, section size or method reinforcement, it can be put forward for consideration. The following information is essential :

Wedge Wire Details:

  • Aperture
  • Section Number
  • Profile
  • Metal

Screen Details:

Number needed

Overall length - parallel to wedge wires

Overall width - parallel to cross rods

Are cross rods to be secured by riveting, screwing or clamping?

Is there any reason for wedge wires to extend more than half a pitch beyond the end cross rods?

Side Frame Details:

Material

Dimensions of cross sections:

Sketches - Show details of the frame and relative position of wedge wires.

Sketches - Show location and size of bolt holes in wedge wires, bolt holes in notches side or rubber frame.

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