From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Brochure from Nash Engineering Co. detailing the simplicity and performance of Nash Hytor pumps and compressors.
| Identifier | ExFiles\Box 122\4\ scan0141 | |
| Date | 13th May 1938 guessed | |
| NASH ENGINEERING CO., (Great Britain) Ltd. NASH PUMPS ARE SIM [Left Page Content] SIMPLICITY Here are shown all the essential parts of the Cone Hytor. Such simplicity indicates a product which has been engineered to the highest possible perfection. THE CONE Note port construction responsible for remarkable efficiency of the Cone Type Hytor. RIGID BEARING BRACKET Housing for bearing is dust proof, and located outside of pump casing. PUMP HEAD Accurately cast and machined and containing air passages which form an efficient unit in the new assembly. NOTHING TO WEAR No valves, sliding vanes, pistons, cams, gears, or rubbing surfaces in this pump. No metal to metal contact excepting in the heavy ball bearings. This is made possible by the unique Hytor liquid seal, which makes large clearances possible. 2 [Right Page Content] NASH ENGINEERING CO., (Great Britain) Ltd. PERFORMANCE NASH HYTOR COMPRESSORS are available in seven sizes, in capacities from 50 to 2,700 cubic feet of free air for pressure up to 45 lbs. per square inch. Recommendations for specific conditions will be made promptly. NASH HYTOR VACUUM PUMPS. The table below gives capacities and horse power requirements at normal speed for Type L Hytor. Type L Hytor is recommended for vacuums up to 18" and shows a maximum vacuum of about 26 inches of mercury. By staging two pumps a vacuum within 0.5 inch mercury of the barometer can be handled. VACUUM PUMPS "L" SERIES PUMP SIZE & SPEED | VACUUM—IN. OF MERCURY | 5 | 10 | 15 | 20 | 25 --- L3 1150 | Capacity 98 | 102 | 100 | 88 | | Motor Size 3.7 | 4.2 | 4.7 | 5.1 | --- L4 1150 | Capacity 215 | 220 | 210 | 196 | 100 | Motor Size 10 | 10 | 10 | 15 | 15 --- L5 870 | Capacity 346 | 352 | 336 | 316 | 176 | Motor Size 15 | 15 | 20 | 20 | 20 --- L6 570 | Capacity 500 | 510 | 500 | 465 | | Motor Size 15 | 20 | 20 | 20 | --- L7 430 | Capacity 770 | 794 | 755 | 676 | | Motor Size 25 | 30 | 30 | 30 | --- L8 340 | Capacity 1480 | 1495 | 1420 | 1250 | | Motor Size 50 | 50 | 60 | 75 | --- L9 273 | Capacity 2110 | 2120 | 2060 | 1900 | | Motor Size 75 | 75 | 75 | 100 | COMPRESSORS "L" SERIES PUMP SIZE & SPEED | PRESSURE—POUNDS PER SQ. IN. | 5 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 --- L3 1150 | Capacity 166 | 157 | 147 | 132 | 105 | 76 | | | | Motor Size 10 | 15 | 15 | 20 | 20 | 20 | | | --- L4 1150 | Capacity 225 | 220 | 206 | 166 | 106 | | | | | Motor Size 15 | 15 | 20 | 20 | 25 | | | | --- L5 870 | Capacity 455 | 450 | 445 | 440 | 410 | | | | | Motor Size 30 | 30 | 40 | 50 | 60 | | | | --- L6 570 | Capacity 794 | 755 | 725 | 710 | | | | | | Motor Size 40 | 50 | 60 | 75 | | | | | --- L7 430 | Capacity 1110 | 1015 | 950 | 760 | | | | | | Motor Size 50 | 60 | 75 | 100 | | | | | --- L8 450 | Capacity 2060 | 1870 | 1690 | 1370 | | | | | | Motor Size 100 | 125 | 150 | 200 | | | | | --- L9 327 | Capacity 2640 | 2430 | 2010 | 1370 | | | | | | Motor Size 125 | 150 | 200 | 250 | | | | | SPEED: The R.P.M. shown for the smaller pumps is the full load 60 cycle induction motor speed which shows best efficiency for each size. For the L8 and L9 the most efficient speeds are shown. For performance at speeds other than those given above refer to our offices; a variation in speed of at least 10% above or below normal is permissible to meet requirements exactly. Nash Hytor cone type vacuum pumps are especially well suited to all applications on paper machines. Their steady suction and their ability to handle some water with the air make them ideal as suction roll pumps. Available with high efficiency at normal or high vacuums, according to requirements, they fit every need in this field. For suction boxes on the wire of a Fourdrinier paper machine we recommend the Jennings Flat Box Unit. It is a combination air and water pumping unit consisting of a Nash Hytor Cone Type Vacuum Pump and a suitable Centrifugal Pump connected to a separating tank. This arrangement permits delivery of the white water to the desired point with high efficiency and relieves the vacuum pump of excess water which would reduce its efficiency as an air pump. Flat Box Units can be manufactured to meet individual requirements using all sizes of Vacuum Pumps to the L6 by the addition of the proper centrifugal pump and tank. In cases where there is a sufficiently deep basement a barometric system of piping may be used to accomplish separation. Such a system is important mainly in connection with flat boxes on cylinder machines when the water is run to waste. Aside from the paper machine itself, Nash Vacuum Pumps and Jennings Flat Box Units find many applications in paper and pulp mills. They are used on pneumatic conveyors, vacuum cleaning systems, multiple effect evaporators, savealls, vacuum filters and continuous pulp washers. Our engineers are conversant with all standard and special paper machine problems and have at their command complete information on existing installations with full operating data. Because of their wide experience, our engineers are well fitted to recommend the type and size of pumps best suited to give given conditions and their services in analyzing these problems are at your command. 7 | ||