A plan of installation showing position of curtains is given in [Fig. 29], and [Fig. 30] shows a cross section of a bunker room with the arrangement and insulation in a wood constructed building.
Direct Expansion Piping.
—There is a decided opinion among many operators that direct expansion ammonia system piping, is preferable over any brine circulation system, owing to the non-requirement of pumps for circulating purposes. Caution is necessary in erecting all direct expansion piping. It must be amply and securely erected, avoiding the use of coach-screws or lag-bolts, owing to the danger of rotting and giving away, thus causing perhaps fatal injuries. Room piping will appear best situated when grouped over alleys and arranged with drip pans so located as to avoid drip onto meats or packages. The ratio of piping given for brine pipe will hold as to lineal feet, substituting foot for foot of two-inch instead of three-inch pipe.
FIG. 29.—PLAN OF GARDNER “CURTAIN” SYSTEM OF REFRIGERATION.
Chill-Room Bunkers.
—In chill-room bunkers there should be a brine system arranged to drip the brine over the pipes for use during the early hours of filling, since a double advantage can be gained by so doing. This is quite effective when intelligently operated.
Freezer and Storage Buildings.
—The use of freezer buildings have become of such consequence in larger packing plants for the storage of meats that it would seem opportune to introduce a description of a freezer storage building and to discuss the requirements necessary for it.
