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Sizing And Calculations

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Sizing And Calculations

GOLDEN RULES OF SIZING AND CALCULATIONS IN PNEUMATICS

Calculations for Air consumption

QA= (A1+A2) x L x P + 1.033 x 10 1.033
QA= 2 x A3x LH x P x 1.033 -3 10
Qn= (QA + QB) x n

Qn : Air consumption of Cylinder actuating/ each time (L/min)
QA : Air volume for Cylinder actuating to back/ each time (L/min)
QB : Air Consumption Volume of Accessaries (Valve the Cylinder) (L/min)
A1 : Push Side Pressured Area (cm )
A2 : Pull Side Pressured Area (cm )

A3 : ID of Connecting tube (cm )
L : Stroke of cylinder (cm)
LH : Lenth of tube (cm)
P : Operating Pressure (kgf/ cm )
n : Operating Frequancy

PNU AIR^TM CYLINDER’S THEORETIC FORCE IN KG/CM²

Cylinder Inside Diameter		25		40		50		65		80		100		125		150		200		250		300
External Diameter Piston Rod		10		16		16		25		25		25		35		35		35		50		50
Operation		Double Acting		Double Acting		Double Acting		Double Acting		Double Acting		Double Acting		Double Acting		Double Acting		Double Acting		Double Acting		Double Acting
Operation		A	B	A	B	A	B	A	B	A	B	A	B	A	B	A	B	A	B	A	B	A	B
Air Pressure (kg/cm2)	2	9	6	20	17	40	37	59	50	88	80	153	144	235	218	343	328	598	578	931	892	1333	1294
	3	13	12	30	25	60	55	88	75	132	121	230	218	353	329	519	490	897	867	1392	1338	1994	1940
	4	18	15	40	33	80	74	118	100	176	161	306	289	470	436	686	651	1196	1156	1852	1784	2656	2587
	5	22	19	50	41	101	92	147	125	225	201	392	363	598	544	862	813	1519	1440	2328	2230	3391	3234
	6	27	23	61	50	121	111	176	149	267	240	461	433	706	655	1029	976	1793	1733	2783	2675	3989	3881
	7	31	27	71	58	141	129	204	174	310	279	536	505	823	764	1200	1137	2092	2019	3242	3121	4743	4228
	8	36	31	80	67	161	147	233	199	355	321	613	578	937	872	1372	1299	2391	2308	3704	3567	5312	5169
	9	40	34	90	75	181	166	263	223	398	361	691	652	1053	980	1544	1460	2685	2598	4165	4013	5973	5821
	10	45	37	100	82	202	184	292	250	443	400	764	725	1170	1088	1715	1627	2989	2881	4635	4460	6635	6463

Pressure Conversion Chart

Unit	Pa	KPa	MPa	bar	mbar	kgf/cm2	cmH2O	mmH2O	mmHg	p.s.i.
Pa	1	10-3	10-6	10-5	10-2	10.2 x 10-6	1.02 x 10-3	101.97 x 10-3	7.5 x 10-3	0.15 x 10-3
KPa	103	1	10-3	10-2	10	10.2 x 10-3	10.2	101.97	7.5	0.15
MPa	106	103	1	10	104	10.2	1.02 x 103	101.97 x 103	7.5 x 103	0.15 x 103
bar	105	102	10-1	1	103	1.02	1.02 x 103	102 x 103	750.06	14.5
mbar	102	10-1	10-4	10	1	1.02 x 10-3	1.02	10.2	0.75	14.5 x 10-3
kgf/cm2	98066.5	98.07	98.07 x 10-3	0.98	980.67	1	1000	10,000	735.56	14.22
cmH2O	98.06	98.07 x 10-3	98.07 x 10-6	0.98 x 10-3	0.98	10.3	1	10	0.74	14.22 x 103
mmH2O	9.806	9.807 x 10-3	9.807 x 10-6	98.07 x 10-6	98.07 x 10-3	10-4	0.1	1	73.56 x 10-3	1.42 x 10-3
mmHg	133.32	133.32 x 10-3	133.32 x 10-6	1.33 x 10-3	1.33	1.36 x 10-3	1.36	13.6	1	19.34 x 10-3
p.s.i.	6894.76	6.89	6.89 x 10-3	68.95 x 10-3	68.95	70.31 x 10-3	70.31	703.07	51.71	1

Cylinder with piston dia mm	Valve Connection Size	Nominal Size mm Approx	Standard Nominal Flowrate ltr/min Appox
Up to 25	M5	2.5	105
> 25 – 50	G 1/8	3.5	Up to 180
> 50 – 100	G ¼	7.0	Up to 1140
> 100 – 200	G ½	12.0	Up to 3000
> 200 – 300	G ¾ G 1	18.0	Up to 6000

* Above all dimension in mm