Cyclopedia of heating, plumbing and sanitation; a complete reference work . 262 STEAM AND 11T WATER FITTING 39 CZD raising the steam pressure. In another mercury seal system, air-valves are omitted and retarders—so called—are placed at thereturn ends of radiators. With a tight job of piping when the air in the system has oncebeen got rid of, the plant may be runfor some time—or until air leaks inagain—at a pressure less than the at-mosphere and with radiators at tem-peratures corresponding to thos<hot-water radiator-. Among the claims made for thissystem are:—Wide range of tempera-ture in t
Cyclopedia of heating, plumbing and sanitation; a complete reference work . 262 STEAM AND 11T WATER FITTING 39 CZD raising the steam pressure. In another mercury seal system, air-valves are omitted and retarders—so called—are placed at thereturn ends of radiators. With a tight job of piping when the air in the system has oncebeen got rid of, the plant may be runfor some time—or until air leaks inagain—at a pressure less than the at-mosphere and with radiators at tem-peratures corresponding to thos<hot-water radiator-. Among the claims made for thissystem are:—Wide range of tempera-ture in the radiators, secured by vary-.
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