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System operating Pressure

Carl J. Cannizzaro
Carl J. Cannizzaro Member Posts: 3
in Strictly Steam
Two Pipe steam system client engineering staff has specified 5 psig at inlet of radiator control valve with 1psi pressure drop across control valve. Boiler are operating at 7psig. At last night AEE meeting Dan was emphatic that max pressure should be about 2.5psig. This is 1967 bldg. with years of hot and cold areas. are we setting up future problems with hot flashing condensate in returns?

Comments

  • nicholas bonham-carter
    nicholas bonham-carter Member Posts: 8,578
    yes
    this system will operate best under 16 ounces of pressure [one ounce per floor, plus two ounces for the house].
    whoever set it up that high was probably compensating for deferred maintenance/bad main venting.--NBC
  • JStar
    JStar Member Posts: 2,752
    Most two pipe steam systems will operate at 0.25psi. That's 4 ounces. Ask the engineer where he got his ratings from. Does he have all of the piping sizes and lengths?

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