. Canadian forest industries 1897-1899. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. April, 1899 THE CANADA IvUIwIBEHIwIAII '3 WOOD PULP ~® ®~ DEPARTMENT THE PROCESS OF MANUFACTURING MECHANICAL WOOD PULP.* By W. A. Hare. (Continued from March issue.) PUMPS.âThe hydraulic pulp grinder is supplied with water under two different pressures. The high pressure is used for pressing the wood against the stone, and varies about 100 pounds per square inch, according to the size of the grinder cylinder and the general practice of the operator. The low pre
. Canadian forest industries 1897-1899. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. April, 1899 THE CANADA IvUIwIBEHIwIAII '3 WOOD PULP ~® ®~ DEPARTMENT THE PROCESS OF MANUFACTURING MECHANICAL WOOD PULP.* By W. A. Hare. (Continued from March issue.) PUMPS.âThe hydraulic pulp grinder is supplied with water under two different pressures. The high pressure is used for pressing the wood against the stone, and varies about 100 pounds per square inch, according to the size of the grinder cylinder and the general practice of the operator. The low pressure is used for backing the pis- ton and follower off the wood, and is only a few pounds per square inch. The high pressure system is supplied by a back-geared triplex pump, such as is shown in Fig. 8. This style of pump is manufactured by the Northey Manufacturing Company, Limited, of Toronto. It is de- signed for high pressures and heavy service, is well made, and reliable. A centrifugal pump supplies the low pres- sure service, to which are connected fire-hoses, cleaning- hoses, wet machine sprays, and the low pressure piping in the grinders. In large mills, it is better to install a special fire pump ; but for small ones it is more economi- cal to pipe direct to the low pressure system, and use a slightly larger pump than is required for ordinary pur- poses. Fig. 9 is a very good type of a centrifugal pump. It is made especially for this service by the Northey Manufacturing Company. A good feature about this par- ticular style is its reversability, which greatly simplifies its installation. Stuff pumps are used to handle the mixed pulp and water, and for mechanical pulp the centrifugal pump is very satisfactory. A pump as is shown in Fig. 9 is suitable for this purpose. Stuff pumps handle the pulp in a large amount of water; generally the water con- tains 1 per cent, of dry pulp by weight. The speed and hose power required for these pumps depends on the ele- vation o
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