SNT End Suction

Technical Data: 

NFPA 20 standard deals with the selection and installation of pumps supplying liquid for private fire protection.

  • The scope of NFPA 20 document include liquid supplies; suction, discharge, and auxiliary equipment; power supplies, including power supply arrangements; electric drive and control; diesel engine drive and control; steam turbine drive and control; and acceptance tests and operation.
  • The purpose of this standard is to provide a reasonable degree of protection for life and property from fire through installation requirements for stationary pumps for fire protection based upon sound engineering principles, test data, and field experience.
  • Design Features: 
    • Applicable Capacity and Head range for SNT pumps are listed below;
    Rated Capacity(GPM) Rated Head(m)
    25 300 1250 4000 30 90
    50 400 1500 4500 40 100
    100 450 2000 50
    150 500 2500 60
    200 750 3000 70
    250 1000 3500 80
    • All interior bolt or screw that are exposed to pumped liquid shall be of rolled bronze or corrosion resistant material.
    • The pump shall be provided with automatic air-release valve, circulation relief valve and pressure gauges.
    • Bearings shall have an L-10 rating of not less than 5000 hours at maximum load.
    • The pumps shall be provided with at least four packing rings plus a lantern ring. The lantern ring may be permitted to replace one ring of packing.
    • Impellers, wear rings, shafts, lantern rings, glands shall be made of corrosion resistant material.
    • Following material specifications are applied to STANDART NFPA fire pumps:
    Part Definition DIN 17007 EN-DIN ASTM
    Casing Cast Iron 0.6025 GG 25 (GJL-250) A48 Gr. 40B
    Ductile Iron 0.7040 GGG 40 (GJS-400-15) A536 Gr. 60-40-18
    Impeller Cast Bronze 2.1050.01 G-CuSn 10 B584 C90700
    Shaft Stainless Steel 1.4021 X20 Cr13 A276 Type420
    Stainless Steel 1.4401 X5 Cr Ni Mo 17-12-2 A276 Type316
    Shaft Sleeve Stainless Steel 1.4401 X5 Cr Ni Mo 17-12-2 A276 Type316
    Technical Drawings: 
    Fire Fighting