End-Suction Centrifugal Fire Pumps YNM UL FM

  • YNM series UL Listed/FM Approved pumps are single-stage, non-self-suction, end-suction centrifugal pumps.
  • With 3 pumps as YNM 525, YNM 825 and YNM 1531, meets the flow range between 50 gpm and 1250 gpm.
  • Pump flanges are designed according to ANSI/ASME B16.1 Class 250 norm.
  • Pump performance tests meet the requirements of UL and FM standards.
  • The single suction, shut-off ımpeller has been balanced with wear rings at axial load and has been dynamically balanced.
  • Shaft sealing is provided with gland gaskets.
  • Elements such as bolts, setscrew, etc. in contact with water in the pump are made of corrosion resistant material.

TECHNICAL specifications pump YNM UL FM

Flow Range 50 – 1250 gpm (10 – 280 m³/h)
Head Range 80 – 155 psi (55 – 110 m)
Operating Pressure 14 bar
Working Temperature 0 – 60°C
Speed 2900 rpm
Suction Flange 3” – 8”
Discharge Flange 2” – 6”


In fire extinguishing systems;

  1.  Hospitals
  2. Offices
  3. Airports
  4. Factories
  5. Schools
  6. Pharmaceutical Plants
  7. Warehouses
  8. Industrial Plants

Bearings pump YNM UL FM

Maintenance-free self-lubricating bearings have been used as pump bear- ing elements

Pumped Liquids YNM UL FM

It is used in pumping clean and sea water that do not contain solid particles

Sealing Pump YNM UL FM

Gland packing is preferred in fire groups with shaft sealing certificate.

Specifications of fire pumps -YNM UL FM

What are the specifications of fire
pumps per NFPA 20?

NFPA; due to the special importance of fire pumps, has set a standard for both material specifications and performance specifications. The compliance of a fire pump with NFPA 20 requires the fulfilment of these requirements. When these specifications are examined, it is seen that there is a very serious difference between general purpose pumps and fire pumps. The fire pumps; throughout their operating life; are designed to provide maximum reliability and net outlet pressure value. The design criterion in general purpose pumps is the maximum efficiency and economic operation feature.

Listed fire pumps; are available for rated flow rates between 100-8000 gpm. The nominal pressure values are given as 30-262 psi (20 mss-185 mss) for horizontal shaft pumps, 26-510 psi (18m55-358m55) for vertical shaft pumps.Listed centrifugal pumps; are classified as horizontal shaft end suction, In-line type, horizontally separable casing and vertical shaft turbine type.

Material specifications of fire -YNM UL FM

pumps per NFPA 20

Pump Casing: Pump casing material must be GG 25 grey cast iron or GGG40 nodular cast iron according to the pressure class.Pump Impeller: According to NFPA 20, UL 448, FM, the fire pump ımpeller must be made of Bronze or stainless steel cast material. As in general purpose pumps, the ımpeller made of grey cast iron material is never used.
Pump Shaft: The pump shaft must be made of AISI316 stainless steel material. Furthermore, FM and UL 448 standards brought strict design rules for the shafts to be used in fire pumps.
Sealing: It must be provided with a gland packing and the packing bearing must be designed to receive at least five lines of packing. Bearing housing: The bearings must be grease lubricated roller bearings. The bearings used must be selected to operate at least 5000 hours smoothly at maximum load.