If desired, a gauge indicating both pressure and vacuum (a compound gauge) can be furnished with exhaust steam injectors.
Table of Sizes.—Pipe Connections.
| Size of Injector | Delivery in Gallons per Hour | Inside Diameter of Pipes. | |||
|---|---|---|---|---|---|
| Branch for Exhaust | Water Supply Pipe | Feed-Water Pipe | Live Steam | ||
| No. 2 | 60 | 11⁄4 inch | 1⁄2 inch | 3⁄4 inch | 1⁄4 inch |
| „ 21⁄2 | 120 | 11⁄2 „ | 3⁄4 „ | 1 „ | 1⁄4 „ |
| „ 3 | 175 | 11⁄2 „ | 3⁄4 „ | 1 „ | 1⁄4 „ |
| „ 4 | 300 | 2 „ | 1 „ | 11⁄4 „ | 3⁄8 „ |
| „ 5 | 480 | 21⁄2 „ | 1 „ | 11⁄4 „ | 3⁄8 „ |
| „ 6 | 680 | 21⁄2 „ | 11⁄4 „ | 11⁄2 „ | 3⁄8 „ |
| „ 7 | 920 | 3 „ | 11⁄4 „ | 11⁄2 „ | 1⁄2 „ |
| „ 8 | 1200 | 31⁄2 „ | 11⁄2 „ | 2 „ | 1⁄2 „ |
| „ 9 | 1550 | 4 „ | 2 „ | 21⁄2 „ | 1⁄2 „ |
| „ 10 | 1920 | 41⁄2 „ | 2 „ | 21⁄2 „ | 3⁄4 „ |
| „ 12 | 2800 | 6 „ | 21⁄2 „ | 3 „ | 3⁄4 „ |
| „ 20 | 10000 | 10 „ | 4 „ | 41⁄2 „ | 11⁄4 „ |
| (OR LARGER) | |||||
The ejector is a low lift pump; it works on the same principle as that of an injector. It has less parts than the latter and is less expensive. The following table applies to ejectors.
Table.
| Size | Discharge Pipe | Suction Pipe | Steam Pipe | Steam jet Diameter | Capacity per Hour, in Gallons |
|---|---|---|---|---|---|
| No. 1 | 1⁄2 in. | 3⁄4 in. | 3⁄8 in. | 11⁄100 in. | 300 |
| „ 2 | 3⁄4 „ | 1 „ | 3⁄8 „ | 15⁄100 „ | 500 |
| „ 3 | 1 „ | 11⁄4 „ | 1⁄2 „ | 20⁄100 „ | 750 |
| „ 4 | 11⁄4 „ | 11⁄2 „ | 1⁄2 „ | 25⁄100 „ | 1,200 |
| „ 5 | 11⁄2 „ | 2 „ | 3⁄4 „ | 30⁄100 „ | 1,700 |
| „ 6 | 2 „ | 21⁄2 „ | 3⁄4 „ | 40⁄100 „ | 3,000 |
| „ 7 | 21⁄2 „ | 3 „ | 1 „ | 50⁄100 „ | 5,000 |
| „ 8 | 3 „ | 4 „ | 1 „ | 60⁄100 „ | 7,500 |
| „ 9 | 4 „ | 5 „ | 11⁄4 „ | 80⁄100 „ | 10,000 |
| „ 10 | 5 „ | 6 „ | 11⁄2 „ | 1 „ | 14,000 |
Figs. 540 and 541.
The accompanying Figs. [540] and [541] represent an ejector with a foot strainer. The table, page [259], gives an idea of its pipe sizes and capacities.