Справочник Пользователя для ITT BPHV

The starting and stopping of the pumps are determined based on the pressure values set on the controller.
Each frequency converter is connected to a pressure transducer.
The controllers exchange information with each other and provide for cyclic changeover.

The figure shows the operating mode of a two-pump booster set 
(Typical Field Set).
•  On demand, water is drawn from the tank.

•  When the pressure drops belows the PS setting the first pump 

starts and the speed is adjusted to maintain a costant pressure as 
demand increases.

•  If the water consumption increases and the pump reaches 

maximum speed, the second pump starts and the speed is adjusted 
to maintain constant pressure.

•  When demand decreases, the speed is reduced until minimum 

speed is reached and one of the pumps are switched off.

•  If consumption keeps decreasing the pump slows down, fills the 

tank and stops at the pressure setting.

PS

Pressure

Flow

Pmax

Duplex

  Type of pumped liquids 

Water containing no gas or corrosive and/or aggressive substances

  Fluid temperature 

Above 0° F to 180° F, Pressure transducer limited

  Ambient temperature 

Above 0° F to 104° F, VFD/Display, keep away from direct sun

  Maximum operating pressure 

360 PSI (Pump without transducer)

  Minimum inlet pressure 

According to NPSH curve and losses, with a minimum margin of 0.5 m

 

Maximum inlet pressure

 

The inlet pressure added to the pressure of the pump at zero flow must be lower

   

than the maximum operating pressure of the set (suction and discharge).

 

Installation

 

Indoors/outdoors, protected from the direct sun. Away from heat sources. Maximum

   

elevation 3300 feet ASL. Maximum humidity 50% without condensation.

 

Hourly starts

 

Maximum 60 up to 10 HP. Above 10 HP and up to 50 HP, maximum 40 starts per

   

hour. Variable speed drive starts.

  Sound emission 

See table

* Note: For higher temperature it is necessary to use special materials (only on request).

 

1 

56 

< 70

 

2 

56 

< 70

 

3 

56 

< 70

 

5 

145 

< 70

 

7½ 

182-184 

< 70

 

10 

215 

< 70

 

15 

254 

73

 

20 

256 

75

 

25 

284 

75

 

30 

284 

75

* Note: Adjusted from 50 Hz data, may vary.