BRL P3486 Farris GEC-Elliott Safety Relief Valve Sizing Rule

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Country of manufacture: England,            Date of manufacture: ____
Overall length: 26.7 cm,          Width: 4.9 cm,           Weight: 53.5 gms.
Materials: All plastic
Cursor: none
Scales: 14
Front: Side A: Pd (Differential Set Pressure) [ G (Specific Gravity), Q (LIquid Capacity (flow rate)) ] A (Orifice Area)
Back: Side B: P (20% Overpressure), P (10% Overpressure ASME-UFPV Code), P (Power/Boiler Code) [ M (MolecularWt.), K_sh, T °F, K_c, K_b or K_v, W (Vapor Capacity (flow rate)) ] A (Orifice Area)
Gauge Marks: [       ]
Condition: C3 (Very minimal signs of use)
Came with: Original leather case, marked 'Farris'

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