Service P&ID No. Line No. / Vessel No. Full Nozzle / Semi Nozzle Safety or Relief Conv. , Bellows , Pilot Op. Bonnet Type Size: Inlet Outlet Flange Rating or Screwed Type of Facing Body and Bonnet Seat and Disk Resilient Seat Seal Guide and Rings Spring Bellows Inlet/Outlet PIPING ANSI CLASS Cap : Screwed or Bolted Lever : Plain or Packed Test Gag Code Fire Block outlet Thermal expantion Fluid and State Required Capacity Liq//Gas % Allowable Overpressure Overpressure Factor Compressibility Factor Latent Heat of Vaporization (Btu/Lb) Ratio of Specific Heats Operating Viscosity Barometric Pressure Steam cond.(super heat/saturated) Calc. Area sq. in. Selected Area Orifice Designation Manufacturer Model No.