Gear pumps of SH, NMSH, NMSHF type and electric pump units on their base are intended for pumping petroleum products (oil, diesel fuel, petroleum, fuel oil) and other liquids possessing lubricating properties, containing no mechanical particles and non-corrosive to pump parts.
The viscosity of the pumped liquids is from 0,018*10-4 up to 22,00*10-4 m2/s (1,08…300°E), temperature –up to +70°С. The lower limit of viscosity is restricted by lubricating power of the pumped liquid, the upper limit – by power of the electric motor and suction capacity of the pump. While placing purchase order do not fail to agree viscosity limits and working temperature of the pumped liquid.
Pumps and units are related to the items of aspect 1 (repairable) as per GOST 27.003-9.
Pumps and units are fabricated in climatic version U, location category 2, 3 or Т2, Т5 as per GOST 15150-69. For the orders of Russian Maritime Register of Shipping (RMRS), the pumps (units) are produced in climatic version OM, location category 2, 5 GOST 15150-69, and may be installed on the marine ships with unlimited region of navigation, as well as in the boiler and engine rooms of the ships having the following automation mark A1 and A2 within the RMRS classification of ships.
By the Client’s request, special pump embodiments for servicing in explosion-and-fire hazard productions of classes V-1а, V-1b, V-1g, V-II as per Electric Installation Code may be delivered.
Electric pump unit consists of gear pump end electric motor which are mounted:
- for SH, NMSH pumps – on common plate (frame) and the coupling protected by housing;
- for NMSHF pumps – with the help of the connecting pieces (welded or cast one) and the coupling.
At the Client's request the pump may be delivered in a complex with the coupling or without the coupling, less the electric motor and plate (frame) or with no connecting piece.
Gear pump is designed as positive-displacement type pumps. As soon as the driving and driven rotors are set in rotation, a vacuum is created on the suction side; as a result, the liquid under the action of atmospheric pressure fills the cavities between gear teeth and moves in them from the inlet port to the outlet port. At the outlet while the teeth are in engagement the liquid is extruded into the system.
The pump consists of the following main parts and subassemblies: working mechanism, casing with rear cover and upright, safety and relief valves, end-face seal.
End-face seals may be of both productions: imported seals and own-produced seals. At the Client's request the stuffing box is possible (maximum allowable pressure of the medium of 2,0 МPа (20 kgf/сm²), for OMTI oil - is not supplied).
Working mechanism consists of two rotors – the driving and driven rotors and the bushings (plain bearings).
|Series||SH, NMSH, NMSHF (for ships)|
|Flow, m³/h, least||18|
|Pump power input (max.), kW||4.5|
|Rotation speed, rpm||980|
|Rotation speed, c˜¹||16.3|
|Pump outlet pressure, kgf/sm², max||4|
|Full overflow pressure, MPa||0.6|
|Kinematic viscosity of pumped liquid (calculated), ° VU||10|
|Kinematic viscosity of pumped liquid (rang), ° VU||1,08...250|
|Allowable vacuum suction, m||5|
For example NMSHF5-25-4,0/4B-3 ОМ5 TU26-06-1558-89, where: