Industrial Perforated Plate Screens - Holes Size and Nominal Pitch Size

Arrangement of holes of industrial perforated plate screens

Three permissible arrangements of holes are illustrated in figures 1 to 3;
Figure 1 for round holes in an equilateral triangle 60° staggered T-arrangement;
Figures 2 for square holes in line U-arrangement;
Figures 3 for square holes in half pitch staggered Z-arrangement.

Industrial perforated plate screen with round holes staggered T-arrangement.

Figure 1: Round holes 60° staggered arrangement
(T-arrangement)
Open area = 0.9(w/p)²

Industrial perforated plate screen with square holes U-arrangement.

Figure 2: Square holes in-line arrangement
(U-arrangement)
Open area = (w/p)²

Industrial perforated plate screen with square holes staggered Z-arrangement.

Figure 3: Square holes half-pitch staggered arrangement
(Z-arrangement)
Open area = (w/p)²

Size of holes and nominal pitch

The preferred size of round or square holes in industrial plate screens is the R 10 series as tables below. The supplementary sizes of R 20 or R 40 in the perforated plate nominal sizes of openings. Table 1 is the pitch/hole ratios and related open areas. Table 2 and 3 are examples which list sizes of holes, and nominal pitch for different open area in the R 10 series.

Table 1 - Pitch/hole ratios and related open areas
Pitch/hole ratio p/w	Approximate open area (%)
Pitch/hole ratio p/w	Round holes	Square holes
1.25	58	64
1.4	46	51
1.6	28	39
1.8	25	31
2	23	25

Table 2 - Examples of round hole perforations in industrial plate screens
Values in millimetres
Hole		Nominal pitch P for an approximate open area of
nominal size w	tolerance on average size △w	58%	46%	35%	28%	23%
Perforated plate thickness of 3 mm and above
125	±3	160
100	±2.5	125
80	±2.1	100
63	±1.7	80	90	100
50	±1.4	63	71	80
40	±1.2	50	56	63
31.5	±1	40	45	50
25	±0.8	31.5	35.5	40
20	±0.6	25	28	31.5
16	±0.5	20	22.4	25
12.5	±0.4	16	18	20	22.4
10	±0.35		14	16	18
8	±0.3		11.2	12.5	14	16
6.3	±0.25			10	11.2	12.5
5	±0.2			8	9	10
4	±0.15				7.1	8
3.15	±0.15					6.3
Perforated plate thickness below 3 mm
10	±0.35	12.5	14	16	18
8	±0.3	10	11.2	12.5	14	16
6.3	±0.25	8	9	10	11.2	12.5
5	±0.25	6.3	7.1	8	9	10
4	±0.25	5	5.6	6.3	7.1	8
3.15	±0.25	4	4.5	5	5.6	6.3
2.5	±0.25		3.55	4	4.5	5
2	±0.2			3.15	3.55	4
1.6	±0.2			2.5	2.8	3.15
1.25	±0.15			2	2.24	2.5
1	±0.15			1.6	1.8	2
0.8	±0.1			1.25	1.4	1.6
0.63	±0.1					1.25
0.5	±0.1					1

Table 3 - Examples of square hole perforations in industrial plate screens Values in millimetres
Hole		Nominal pitch P for an approximate open area of
nominal size w	tolerance on average size △w	64%	51%	39%	31%	25%
Perforated plate thickness of 3 mm and above
125	±3	160
100	±2.5	125
80	±2.1	100
63	±1.7	80	90	100
50	±1.4	63	71	80
40	±1.2	50	56	63
31.5	±1	40	45	50
25	±0.8	31.5	35.5	40
20	±0.6	25	28	31.5
16	±0.5	20	22.4	25
12.5	±0.4	16	18	20
10	±0.35		14	16	18
8	±0.3		11.2	12.5	14
6.3	±0.25			10	11.2
5	±0.2				9	10
4	±0.15				7.1	8
3.15	±0.15					6.3
Perforated plate thickness below 3 mm
10	±0.35	12.5	14	16	18
8	±0.3	10	11.2	12.5	14
6.3	±0.25	8	9	10	11.2	12.5
5	±0.25		7.1	8	9	10
4	±0.25			6.3	7.1	8
3.15	±0.25			5		6.3
2.5	±0.25			4		5
2	±0.2					4

Designation

Industrial plate screens shall be designated by

Material (may be low carbon steel, stainless steel, copper, or other steels and non-ferrous metals);
Shape and size of plate;
Plate thickness;
Shape of holes;
Size of holes;
Arrangement and orientation of holes;
Pitch of holes.

The above items describe code refer to designation perforations in industrial plate screens.

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