National boilers, radiators, and specialties: catalog no. 26 (1920)
National Radiator Company · National Radiator Company · leaf 75
tingany possibility of becoming unseated. Rules for Setting and Operating After trap is set in level position, remove long JHl-inch plugfrom top, and replace plug by a long automatic air valve, andtrap is ready for operation. Where trap is used in connection with economizing coil, placetrap above… … These tanks are made of refined boiler steel, double-rivetedcaulked and galvanized, and tested to 150 pounds pressure. They are tapped top and bottom for 1-inch overflow andexpansion pipe, and on the side near the top; 1 inch for fillingattachment. They are also tapped on side for ^-inch water…
