Phone: +61 (0) 7 3889 9949Email: sales@monarchindustrial.com.au

Velocity in Schedule 80 Plastic Pipe for Water - Safe Flow Velocity

Hayward establishes a generally accepted safe flow velocity for plastic piping systems. For systems without fast opening or closing valves, a maximum velocity of 8 feet per second is recommended. However, for systems equipped with such valves (like solenoid or pneumatically actuated valves lacking speed controls), the maximum velocity is typically limited to 5 feet per second. In contrast, metal piping systems are often designed to accommodate flow rates of up to 15 feet per second, significantly higher than those acceptable for plastic systems. This distinction is crucial when considering the installation of plastic components such as valves, strainers, or filters within a metal system.

Discharge				Velocity in Schedule 80 Plastic Pipe for Water @ 15.5°C (60°F)
Lt/Hour	Lt/Min	GPM (US)	Cubic Feet / Sec	Feet / Sec	Feet / Sec	Feet / Sec	Feet / Sec	Feet / Sec	Feet / Sec	Feet / Sec	Feet / Sec
					1/4"	3/8"	1/2"	3/4"	1"	1-1/4"	1-1/2"
45	0.8	0.2	0.000446	—	0.824	—	—	—	—	—	—
68	1.1	0.3	0.000668	—	1.237	0.651	0.392	—	—	—	—
91	1.5	0.4	0.000891	—	1.646	0.867	0.529	—	—	—	—
114	1.9	0.5	0.00111	—	2.061	1.083	0.653	0.359	—	—	—
136	2.3	0.6	0.00134	—	2.476	1.303	0.782	0.431	—	—	—
182	3.0	0.8	0.00178	—	3.295	1.728	1.043	0.574	—	—	—
227	3.8	1	0.00223	—	4.122	2.167	1.311	0.718	0.435	—	—
454	7.6	2	0.00446	—	8.245	4.335	2.609	1.432	0.871	0.525	—
681	11.4	3	0.00668	—	12.38	6.502	3.919	2.161	1.306	0.788	0.538
908	15.1	4	0.00891	2"	16.50	8.67	5.218	2.876	1.747	1.051	0.717
1136	18.9	5	0.01114	—	—	10.837	6.528	3.592	2.181	1.313	0.896
1363	22.7	6	0.01337	0.65	2-1/2"	13.01	7.827	4.308	2.614	1.579	1.076
1817	30.3	8	0.01782	0.86	—	—	10.448	5.741	3.482	2.105	1.434
2271	37.9	10	0.02228	1.08	0.752	3"	13.057	7.185	4.351	2.632	1.798
3407	56.8	15	0.03342	1.61	1.134	—	—	10.778	6.531	3.941	2.697
4542	75.7	20	0.04456	2.15	1.505	0.986	—	—	8.712	5.252	3.596
5678	94.6	25	0.0557	2.69	1.886	1.238	—	4"	10.881	6.574	4.484
6814	113.6	30	0.06684	3.23	2.256	1.476	—	—	13.062	7.884	5.383
7949	132.5	35	0.07798	3.78	2.638	1.726	—	0.973	15.232	9.193	6.282
9085	151.4	40	0.08912	4.32	3.009	1.976	—	1.114	17.413	10.515	7.171
10221	170.3	45	0.1003	4.84	3.391	2.215	—	1.247	—	11.838	8.069
11356	189.3	50	0.1114	5.39	3.761	2.465	—	1.391	—	13.147	8.969
13627	227.1	60	0.1337	6.47	4.513	2.953	—	1.665	—	15.779	10.778
15899	265.0	70	0.156	7.55	5.266	3.453	—	1.942	—	—	12.577
18170	302.8	80	0.1782	8.62	6.018	3.942	—	2.228	—	6"	14.360
20441	340.7	90	0.2005	9.69	6.771	4.442	—	2.504	—	—	16.162
22712	378.5	100	0.2228	10.77	7.523	4.931	—	2.781	—	1.225	17.960
28391	473.2	125	0.2785	13.48	9.409	6.168	—	3.475	—	1.534	22.445
34069	567.8	150	0.3342	16.18	11.28	7.395	—	4.171	—	1.893	—
39747	662.4	175	0.3899	18.87	13.17	8.63	—	4.865	—	2.141	8"
45425	757.1	200	0.4456	21.56	15.07	9.86	—	5.561	—	2.451	—
51103	851.7	225	0.5013	—	16.94	11.10	—	6.255	—	2.759	1.577
56781	946.4	250	0.557	—	—	12.325	—	6.951	—	3.069	1.752
62459	1041.0	275	0.6127	—	—	13.563	—	7.645	—	3.367	1.927
68137	1135.6	300	0.6684	—	—	14.768	—	8.341	—	3.675	2.102
73815	1230.3	325	0.7241	—	—	16.041	—	9.035	—	3.985	2.277
79494	1324.9	350	0.7798	—	—	—	—	9.731	—	4.294	2.453
85172	1419.5	375	0.8355	—	—	—	—	10.425	—	4.592	2.628
90850	1514.2	400	0.8912	—	—	—	—	11.121	—	4.901	2.803
96528	1608.8	425	0.9469	10"	—	—	—	11.815	—	5.211	2.989
102206	1703.4	450	1.003	—	—	—	—	12.511	—	5.519	3.164
107884	1798.1	475	1.059	2.199	—	—	—	13.205	—	5.817	3.329
113562	1892.7	500	1.114	2.229	—	—	—	13.901	—	6.126	3.515
124919	2082.0	550	1.225	2.459	—	—	—	15.279	—	6.744	3.865
136275	2271.2	600	1.337	2.679	12"	—	—	16.681	—	7.352	4.215
147631	2460.5	650	1.225	2.899	—	—	—	—	—	7.971	4.566
158987	2649.8	700	1.56	3.129	2.205	—	—	—	—	8.588	4.916
170343	2839.1	750	1.671	3.349	2.359	—	—	—	—	9.195	5.267
181700	3028.3	800	1.56	3.569	2.513	—	—	—	—	9.802	5.617
193056	3217.6	850	1.782	3.799	2.677	—	—	—	—	10.421	5.968
204412	3406.9	900	2.005	4.019	2.831	—	—	—	—	11.028	6.318
215768	3596.1	950	2.117	4.239	2.984	—	—	—	—	11.646	6.668
227125	3785.4	1000	2.228	4.469	3.149	—	—	—	—	12.253	7.019
249837	4164.0	1100	2.451	4.919	3.458	—	—	—	—	13.489	7.719
272550	4542.5	1200	2.674	5.359	3.775	—	—	—	—	14.715	8.431
295262	4921.0	1300	2.896	5.809	4.093	—	—	—	—	15.929	9.121
317974	5299.6	1400	3.119	6.259	4.401	—	—	—	—	17.165	9.833
340687	5678.1	1500	3.342	6.698	4.718	—	—	—	—	18.391	10.534
363399	6056.7	1600	3.565	7.148	5.037	—	—	—	—	19.611	11.235
408824	6813.7	1800	4.01	8.038	5.662	—	—	—	—	22.067	12.636
454249	7570.8	2000	4.456	8.938	6.228	—	—	—	—	24.517	14.038
567812	9463.5	2500	5.57	11.168	7.868	—	—	—	—	—	17.552
681374	11356.2	3000	6.684	13.396	9.437	—	—	—	—	—	21.068
794936	13248.9	3500	7.798	15.637	11.006	—	—	—	—	—	24.572
908498	15141.6	4000	8.912	17.866	12.587	—	—	—	—	—	28.080
1022061	17034.3	4500	10.13	20.106	14.156	—	—	—	—	—	31.613
1135623	18927.1	5000	11.14	—	—	—	—	—	—	—
1362748	22712.5	6000	13.37	—	—	—	—	—	—	—	—
1589872	26497.9	7000	15.6	—	—	—	—	—	—	—	—
1816997	30283.3	8000	17.82	—	—	—	—	—	—	—	—
2044121	34068.7	9000	20.05	—	—	—	—	—	—	—	—
2271246	37854.1	10000	22.28	—	—	—	—	—	—	—	—
2725495	45424.9	12000	26.74	—	—	—	—	—	—	—	—

"Liquid Filtration Equipment, Bag Filters, Filter Bags and Manufacturing Strainer Screens for Australia, Pacific and South East Asia for over 25 years"

Monarch Asia Pacific Pty Ltd
Trading as Monarch Industrial Products
ABN 60 141 555 688
Unit 3, 8 Bult Drive, Brendale, QLD 4500
AUSTRALIA
Phone: +61 (0) 7 3889 9949

Alternate Site: www.monarchasiapacific.com.au

Menu

Velocity in Schedule 80 Plastic Pipe for Water - Safe Flow Velocity