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).
Preliminary test report on the water circulation restriction of a Marine BO Serck Oil Cooler.
| Identifier | ExFiles\Box 133\3\ scan0178 | |
| Date | 19th April 1940 | |
| 1128 To Jmr. c. to Rm{William Robotham - Chief Engineer}/AA.{D. Abbot-Anderson} Rm{William Robotham - Chief Engineer}/OTS.7/JH.19.4.40. Marine BO, Serck Oil Cooler. No.D.34906. We have carried out a preliminary test to determine the amount of restriction to the normal water circulation caused by placing the above cooler on the suction side of the water pump. Test No.1. When suitable unions are fitted, for connection to nuts and nipples (water conns) the inlet and outlet tested is .500 ins. At 2500 r.p.m. :- Flow into header tank = 12.7 gals/min. Test No.2. With unions removed, and rubber connections used, the inlet and outlet is .750". At 2500 r.p.m. :- Flow into header tank = 18.7 gals/min. Test No.3. Without cooler in circuit. At 2500 r.p.m. :- Flow into header tank = 38 gals/min. Conclusion. It should be noted that this unit has not been tested for efficiency as an oil cooler, the first requirement being to eliminate unnecessary restriction to the water circulation. In this respect, we would say that the unit is of poor design, as the restriction to water flow should be the cooler element and not in the connection. Rm{William Robotham - Chief Engineer}/OTS. | ||