GB339972A - Improvements in or relating to furnace cooling systems - Google Patents

Abstract

339,972. Mullen, B. J. Dec. 19, 1928, [Convention date]. indicators and alarms; leakage in water jackets, detecting.-In a blast furnace or similar cooling system in which water is circulated at a pressure lower than that in the furnace, floatoperated signal means are provided for indicating abnormal conditions in the system. The apparatus shown comprises a gas tight float chamber 28 connected through valves 21, 19 with a pipe 14 which conveys exhaust water from the cooling- system to the waste main 15. The float is carried by an arm 34 fixed to a shaft 35 mounted in bearings 36, 37, and coupled at its free end to the operating member 47 of a double pole switch. Both terminals on one side of the switch are connected to a power main by a lead 50, while the terminals 51, 52 on the other side are connected respectively to a horn alarm 55, and a lump panel 56. A signal lamp 59 on the float chamber is in parallel with the corresponding lamp on the panels. To prevent escape of gas at the bearings the shaft 35 is forced into the coned seating 41 by a spring-pressed block 41<a>. Au indicator arm 46 extends through a slot 46<a> in the casing. In operation any gas which has leaked from the furnace into the cooling-system is separated from the water by the pivoted baffle 18 and collects in the float chamber. The liquid level in the chamber is thus depressed, and when it reaches a certain point the switch is operated to complete the circuits through the alarm and the lamps. A glass sight tube 23 is fitted so that the rise of bubbles can be seen, and the inlet to the float chamber is covered by a cap 26 to prevent the rising stream from disturbing the float. In starting the apparatus the liquid level is so adjusted that the switch is in the off position when the chamber 28 is put into communication with the pipe 14, and this can be effected by vertical adjustment of the overflow pipe 62<a> and by pouring liquid or shot into the channel 64, Samples of gas entrapped in the chamber can be taken through the cock 75. The apparatus may be fitted in the inlet pipe of the cooling system, and in this case the operation depends solely on the pressure of the water supply. Where the alarm device is used for a number of cooling units, e.g. bosh plates, connected in series, each unit can be tested separately by closing the valve 19, and putting the chamber 28 in communication with the unit through the valve 21, branch 22 and a temporary connection to a fitting similar to the part 17. The Specification as open to inspection under Sect. 91 (3) (a) describes the portable testing device shown in Fig. 6, (Cancelled). This comprises a glass walled chamber 80 which can be screwed on to a fitting 17<a> having a valve 19<a> and a gas separating plate. 18a adapted to be moved out of operative position when the tester is not in use. Gas samples can be taken through the branch 88 and water may be taken to waste through the connection 90. This subject-matter does not appear in the Specification as accepted.