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Open-End Discharge
The term "open-end discharge" refers to a hose which empties a fluid into the atmosphere. Even though one end is open, the pressure is not low throughout the hose. The inlet end pressure is equal to that in the line to which the hose is connected unless the flow rate is so low that the hose is not completely filled.
The pressure along the hose length drops from a maximum at the inlet to zero at the outlet and the pressure at any given point along the length is nearly proportional to the distance from the hose inlet. The following table shows the flow in gallons per minute in open-end discharge service.
| Open-End Flow (GPM) | |||||||||||
| Pressure at inlet, psi | Hose Length, Feet | ||||||||||
| 25 | 50 | 75 | 100 | 125 | 150 | 200 | 300 | ||||
| 1/2" hose | 30 40 50 60 70 80 90 100 125 | 10.4 12.1 13.8 15.2 16.6 18.0 19.0 20.1 22.8 | 6.2 8.5 9.4 10.4 11.2 12.1 13.0 13.8 15.5 | 5.6 6.2 7.5 8.5 9.0 9.8 10.4 11.0 12.5 | 4.8 5.6 6.4 7.1 7.8 8.5 8.8 9.4 10.5 | 4.3 5.0 5.6 6.2 6.8 7.3 7.7 8.5 9.4 | 3.8 4.5 5.1 5.6 6.2 6.6 7.1 7.5 8.5 | 3.3 3.8 4.0 4.9 5.3 5.6 6.0 6.4 7.2 | 2.6 3.2 3.5 3.8 4.2 4.5 4.8 4.9 5.8 | ||
| 5/8" hose | 30 40 50 60 70 80 90 100 125 | 18.1 21.4 23.9 26.5 27.5 30.6 32.5 34.5 39.0 | 12.5 14.8 16.5 18.1 20.0 21.4 22.5 23.9 27.0 | 10.3 12.5 13.2 14.8 16.0 16.8 18.1 19.0 21.5 | 8.7 10.3 11.4 12.5 13.7 14.8 15.5 16.6 18.5 | 7.7 9.0 10.3 11.2 12.0 13.0 14.0 14.8 16.6 | 7.0 8.3 9.2 10.3 11.0 11.8 12.5 13.2 15.0 | 6.0 7.0 7.9 8.7 10.0 10.3 10.5 11.4 12.9 | 4.9 5.7 6.3 7.0 7.6 8.3 8.7 9.2 10.5 | ||
| 3/4" hose | 30 40 50 60 70 80 90 100 125 | 31.0 36.0 41.0 45.5 49.5 53.0 56.2 60.0 68.0 | 21.3 25.0 28.0 31.0 34.0 36.0 39.0 41.0 46.0 | 17.2 20.0 22.5 25.0 27.2 29.1 31.0 33.0 37.5 | 14.8 17.2 19.2 21.3 23.5 25.0 27.0 28.0 32.0 | 13.0 15.2 17.2 19.0 21.0 22.0 23.8 25.0 23.0 | 11.8 13.8 15.5 17.2 18.8 20.0 21.3 22.6 25.8 | 10.2 11.8 13.2 14.8 17.1 17.2 18.2 19.2 21.8 | 8.2 9.4 10.7 11.8 12.8 13.8 14.8 15.5 17.5 | ||
| 1" hose | 30 40 50 60 70 80 90 100 125 | 68.0 79.0 89.0 100.0 - - - - - | 46.2 54.4 62.0 68.0 74.0 79.0 84.0 89.0 101.0 | 37.5 44.0 49.0 54.4 59.0 63.0 68.0 71.0 80.0 | 32.0 37.5 42.0 46.2 51.0 54.4 58.0 62.0 68.0 | 28.5 33.0 37.5 41.8 45.0 48.0 51.8 54.4 62.0 | 25.8 30.0 34.0 37.5 40.8 43.0 46.2 49.0 55.8 | 22.0 25.8 29.0 32.0 37.3 37.5 40.0 42.0 47.8 | 17.8 20.8 23.3 25.8 28.0 30.0 32.0 34.0 38.0 | ||
| 1 1/4" hose | 50 75 100 150 | - - - - | 110.0 130.0 150.0 - | 85.0 110.0 125.0 150.0 | 72.0 90.0 110.0 130.0 | 56.0 80.0 92.0 120.0 | 58.0 73.0 85.0 110.0 | 50.0 64.0 73.0 90.0 | 42.0 52.0 58.0 67.0 | ||
| 13/8" hose | 50 75 100 150 | - - - - | 140.0 170.0 205.0 - | 115.0 140.0 160.0 205.0 | 96.0 125.0 140.0 170.0 | 85.0 110.0 125.0 155.0 | 75.0 96.0 110.0 140.0 | 65.0 84.0 96.0 125.0 | 54.0 67.0 75.0 97.0 | ||
| 11/2" hose | 50 75 100 150 | - - - - | 180.0 230.0 260.0 - | 150.0 180.0 220.0 260.0 | 130.0 160.0 180.0 230.0 | 120.0 145.0 170.0 205.00 | 105.0 130.0 150.0 180.0 | 90.0 120.0 130.0 160.0 | 74.0 90.0 105.0 130 | ||
| 2" hose | 50 75 100 150 | - - - - | 380.0 480.0 550.0 - | 310.0 380.0 450.0 550.0 | 270.0 330.0 380.0 480.0 | 240.0 290.0 350.0 425.0 | 210.0 270.0 310.0 380.0 | 180.0 230.0 260.0 330.0 | 150.0 180.0 215.0 265.0 | ||
Thank you to Goodyear Tire & Rubber company. Source material Goodyear Catalog #99-130. Any errors in the transcription of this data are solely the responsibility of JGB Enterprises, Inc. No warranty, including implied warranty of merchantablility, fitness for a particular purpose, or other warranty of quality is either expressed or implied of this product.