Flow vs. Pressure Drop Data

Flow specifications can be set by measuring the flow rate at a fixed pressure differential across a porous material for a specific gas or liquid and for a specified porous surface area. A flow typical specification is shown below:

Air Flow for Filter Disc =0.5 +/- 25% SCFM (standard cubic feet per minute) per square inch of porous material at 30 PSIG vented to atmosphere.

Air Flow for Precision Flow Restrictor = 200 +/- 7.5% SCCM (standard cubic centimeters per minute) at 30 PSIG vented to atmosphere.

Flow measurement methods for porous materials are described by International Organization for Standardization (ISO) Document 4022. Flow Tolerances need to be determined per application, but the porosity of porous metals can adjusted by secondary operations to precisely control the permeability for specialized applications such as controlled leaks or to act as calibration standards.

Typical Air Permeability for Standard 316LSS Discs- 0.5" OD x 1/16" thick
	Disc Flow in SCFM/Ft2 @ Pressure Drop to atmosphere
Micron Grade	2 PSID	4 PSID	6PSID	8PSID	10PSID
0.05	0.1	0.2	0.3	0.4	0.6
0.1	0.4	0.7	1.1	1.4	1.8
0.2	1.4	2.8	4.2	5.6	7
0.5	7.2	13.6	20	27.2	34.4
1	21	38	57	77	99
2	41	73	110	148	188
5	124	202	328	438	566
10	243	388	624	856	1100
20	340	531	866	1181	1520
40	406	618	1008	1380	1776
60	564	856	1404	1932	2472
100	808	1176	1970	2724	3520

	Disc Flow in SLPM/in² at Pressure Drop to atmosphere
Micron Grade	2 PSID	4 PSID	6PSID	8PSID	10PSID
0.05	0.02	0.04	0.06	0.08	0.12
0.1	0.1	0.1	0.2	0.3	0.4
0.2	0.3	0.6	0.8	1.1	1.4
0.5	1.4	2.7	3.9	5.3	6.8
1	4	7	11	15	19
2	8	14	22	29	37
5	24	40	64	86	111
10	48	76	123	168	216
20	67	104	170	232	299
40	80	122	198	271	349
60	111	168	276	380	486
100	159	231	387	536	692

	Disc Flow in SLPM/cm² at Pressure Drop to atmosphere
Micron Grade	2 PSID	4 PSID	6PSID	8PSID	10PSID
0.05	0.003	0.006	0.009	0.012	0.018
0.1	0.01	0.02	0.03	0.04	0.05
0.2	0.04	0.09	0.13	0.17	0.21
0.5	0.22	0.41	0.61	0.83	1.05
1	0.6	1.2	1.7	2.3	3.0
2	1.2	2.2	3.4	4.5	5.7
5	3.8	6.2	10.0	13.4	17.3
10	7.4	11.8	19.0	26.1	33.5
20	10.4	16.2	26.4	36.0	46.3
40	12.4	18.8	30.7	42.1	54.1
60	17.2	26.1	42.8	58.9	75.3
100	24.6	35.8	60.0	83.0	107.3

Typical Permeability for Standard 316LSS Cups- 0.5" OD x 0.375" ID x 1" Long (Area = 1.76 in²)
	Cup Flow in SCFM @ Pressure Drop to atmosphere
Micron Grade	2 PSID	4 PSID	6PSID	8PSID	10PSID
0.1	0.06	0.11	0.17	0.22	0.28
0.2	0.2	0.4	0.6	0.9	1.1
0.5	1.1	2.1	3.1	4.2	5.3
1	3	6	9	12	15
2	6	11	17	23	29
5	19	31	50	67	87
10	37	60	96	132	169
20	52	82	133	182	234
40	62	95	155	212	273
60	87	132	216	297	380
100	124	181	303	419	541

	Cup Flow in SLPM at Pressure Drop to atmosphere
Micron Grade	2 PSID	4 PSID	6PSID	8PSID	10PSID
0.1	1.6	3.1	4.7	6.3	7.8
0.2	6	12	18	24	30
0.5	31	59	87	118	150
1	91	167	247	334	432
2	178	317	481	644	819
5	540	881	1428	1909	2466
10	1059	1689	2717	3727	4789
20	1480	2313	3769	5141	6618
40	1766	2689	4389	6008	7732
60	2456	3727	6113	8411	10762
100	3518	5120	8575	11860	15325

	Cup Flow in SCFM/Ft² @ Pressure Drop to atmosphere
Micron Grade	2 PSID	4 PSID	6PSID	8PSID	10PSID
0.1	0.5	0.9	1.4	1.8	2.3
0.2	1.8	3.5	5.2	7.0	8.7
0.5	9	17	25	34	43
1	26	48	71	96	124
2	51	91	138	185	235
5	155	253	410	548	708
10	304	485	780	1070	1375
20	425	664	1082	1476	1900
40	507	772	1260	1725	2220
60	705	1070	1755	2415	3090
100	1010	1470	2462	3405	4400

Porous Tube Air Flow in SCFM/Ft2 @ Pressure Drop to atmosphere Æ 1/8î Thick Wall
	Pressure Differential and Air Flow in SCFM/Ft²
Micron Grade	2 PSID	4 PSID	6PSID	8PSID	10PSID
0.1	0.46	0.9	1.35	1.8	2.25
0.2	1.8	3.5	5.2	7	8.7
0.5	9	17	25	34	43
1	26	48	71	96	124
2	51	91	138	185	235
5	155	253	410	548	708
10	304	485	780	1070	1375
20	425	664	1082	1476	1900
40	507	772	1260	1725	2220
60	705	1070	1755	2415	3090
100	1010	1470	2462	3405	4400

Porous Tube Air Flow in SLPM/in² at Pressure Drop to atmosphere - 1/8î Thick Wall
	Pressure Differential and Air Flow in SLPM/in²
Micron Grade	2 PSID	4 PSID	6PSID	8PSID	10PSID
0.1	0.09	0.18	0.27	0.35	0.44
0.2	0.4	0.7	1.0	1.4	1.7
0.5	1.8	3.3	4.9	6.7	8.5
1	5	9	14	19	24
2	10	18	27	36	46
5	30	50	81	108	139
10	60	95	153	210	270
20	84	131	213	290	374
40	100	152	248	339	437
60	139	210	345	475	608
100	199	289	484	670	865

Porous Tube Air Flow in SLPM/cm² at Pressure Drop to atmosphere - 1/8î Thick Wall
	Pressure Differential and Air Flow in SLPM/cm²
Micron Grade	2 PSID	4 PSID	6PSID	8PSID	10PSID
0.1	0.01	0.03	0.04	0.05	0.07
0.2	0.05	0.11	0.16	0.21	0.27
0.5	0.27	0.52	0.76	1.04	1.31
1	0.79	1.46	2.16	2.93	3.78
2	1.55	2.77	4.21	5.64	7.16
5	4.72	7.71	12.50	16.70	21.58
10	9.27	14.78	23.77	32.61	41.91
20	12.95	20.24	32.98	44.99	57.91
40	15.45	23.53	38.41	52.58	67.67
60	21.49	32.61	53.49	73.61	94.18
100	30.78	44.81	75.04	103.78	134.11

Flow vs. Pressure Drop Data

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