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BLACKMER NP1.5B - User Manual

BLACKMER NP1.5B
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BLACKMER POWER PUMPS
960052
INSTRUCTIONS 103-A00
INSTALLATION OPERATION AND MAINTENANCE INSTRUCTIONS
Section
Effective
Replaces
103
Oct 2012
Oct 2011
MODELS: NP1.5B, NP2F, NP2.5F, NP3F, NP4F, NPH4F
TABLE OF CONTENTS Page
PUMP DATA
Safety Data 1 - 2
Technical Data 2
Initial Pump Start Up Information 2
INSTALLATION
Pre-Installation Cleaning 3
Location and Piping 3
Mounting 3
Coupling Alignment 4
Pump Rotation 4
Heating Heads / Jackets 4
Heating Heads / Electric 4
Check Valves 4
OPERATION
Pre-Start Up Check List 5
Start Up Procedures 5
Running the Pump in Reverse Rotation 5
Flushing the Pump 6
Pump Relief Valve 6
Relief Valve Setting and Adjustment 6
MAINTENANCE
Strainers 7
Lubrication 7
Vane Replacement 7
Pump Disassembly 8
Pump Assembly 8
TROUBLE SHOOTING 10
AFFF PUMPS 11
NOTE: Numbers in parentheses following individual parts
indicate reference numbers on Blackmer Parts Lists.
Blackmer pump manuals and parts lists may be obtained
from Blackmer's website (www.blackmer.com) or by
contacting Blackmer Customer Service.
NP1.5 NP2 NP2.5
103-A01 103-A02 103-A03
NP3 NP4 NPH4
103-A04 103-A05 103-A06
SAFETY DATA
This is a SAFETY ALERT SYMBOL.
When you see this symbol on the product, or in the
manual, look for one of the following signal words and be
alert to the potential for personal injury, death or major
property damage
Warns of hazards that WILL cause serious personal injury,
death or major property damage.
Warns of hazards that CAN cause serious personal injury,
death or major property damage.
Warns of hazards that CAN cause personal injury
or property damage.
NOTICE:
Indicates special instructions which are very
important and must be followed.
NOTICE:
Blackmer Pumps MUST only be installed in systems,
which have been designed by qualified engineering
personnel. The system MUST conform to all applicable
local and national regulations and safety standards.
This manual is intended to assist in the installation and
operation of the Blackmer NP Series pumps, and MUST
be kept with the pump.
Pump service shall be performed by qualified technicians
ONLY. Service shall conform to all applicable local and
national regulations and safety standards.
Thoroughly review this manual, all instructions and hazard
warnings, BEFORE performing any work on the pump.
Maintain ALL system and pump operation and hazard
warning decals.

Table of Contents

Questions and Answers

  • R
    Richard VelezAug 12, 2025
    Why is my BLACKMER NP1.5B motor overloaded?
    • J
      Jennifer RojasAug 12, 2025
      The BLACKMER Power Pump motor might be overloaded due to several reasons: the motor's horsepower may be insufficient for the application, there could be improper wiring, misalignment, or excessive viscosity, pressure, or speed. Other potential causes include faulty or worn sleeve bearings, the rotor rubbing against the head, excessively tight packing, or unevenly tightened stud nuts interfering with the packing follower.
  • M
    Matthew TorresAug 16, 2025
    Why is my BLACKMER NP1.5B Power Pump so noisy?
    • J
      Joyce WilsonAug 16, 2025
      There are several potential causes for a noisy BLACKMER Power Pump. These include excessive vacuum due to undersized fittings, pump speed being too fast for the liquid's viscosity, or the pump being too far from the fluid source. Running the pump with a closed discharge line, pump misalignment, an unsecured baseplate, worn sleeve bearings, vibration from piping, a bent shaft, a misaligned drive coupling, a worn rotor, a malfunctioning valve, insufficient oil in the gear reducer or damaged vanes can also cause noise.
  • S
    Steve WilliamsAug 20, 2025
    What causes a broken shaft in BLACKMER NP1.5B Power Pump?
    • V
      Victoria ChanAug 20, 2025
      A broken shaft in your BLACKMER Power Pump can be attributed to foreign objects entering the pump, viscosity being too high for the pump speed, the relief valve not opening, hydraulic hammer, pump/driver misalignment, overtightened V-belts (if equipped), excessively worn vanes or vane slots, or settled/solidified material in the pump at start-up.
  • T
    Thomas RichardsonAug 23, 2025
    Why is my BLACKMER NP1.5B Power Pump mechanical seal leaking?
    • S
      Stephanie VelasquezAug 25, 2025
      Mechanical seal leakage in a BLACKMER Power Pump can occur if the seal rings/O-rings are not compatible with the liquids pumped, or if they are nicked, cut, or twisted. Other potential causes include a damaged, worn, or dirty shaft at the seal area, excessive cavitation, cracked, scratched, pitted, or dirty mechanical seal faces, or excessively worn pump sleeve bearings.
  • M
    Monica CollinsAug 27, 2025
    What causes damaged vanes in BLACKMER Power Pump?
    • J
      Jessica AlexanderAug 27, 2025
      Damaged vanes in a BLACKMER Power Pump can result from foreign objects entering the pump, running the pump dry for extended periods, cavitation, viscosity being too high for the vanes or pump speed, incompatibility with the liquids pumped, excessive heat, worn or bent push rods, settled or solidified material in the pump at start-up, hydraulic hammer, or incorrectly installed vanes.
  • G
    Gregory WilliamsAug 31, 2025
    Why is my BLACKMER NP1.5B Power Pump not priming?
    • S
      Sean MartinezAug 31, 2025
      If your BLACKMER Power Pump is not priming, several factors could be at play. It might be due to the pump not being wetted initially, a closed suction valve, or air leaks in the suction line. Other potential causes include a clogged strainer, obstructions in the suction line or valves, incorrect motor rotation, a broken drive train, the pump being vapor-locked, insufficient pump speed for priming, or worn vanes.
  • P
    Philip LynchSep 3, 2025
    Why is my BLACKMER NP1.5B making so much noise?
    • C
      Christopher MooreSep 4, 2025
      If your BLACKMER Power Pump exhibits noise, several factors may be responsible. These include excessive vacuum due to undersized fittings, high pump speed for the liquid's viscosity, or the pump being too far from the fluid source. Other causes may be running the pump with a closed discharge line, pump misalignment, an unsecured baseplate, worn sleeve bearings, vibration from piping, a bent shaft, a worn rotor, a malfunctioning valve, insufficient oil in the gear reducer, or damaged vanes.
  • D
    Devin CarterSep 8, 2025
    Why is the BLACKMER NP1.5B capacity reduced?
    • M
      Morgan ChenSep 8, 2025
      Reduced capacity in your BLACKMER Power Pump can stem from several issues. Check if the suction valves are fully open and inspect for air leaks in the suction line. Also, examine the suction line for excessive restrictions due to undersized piping, too many elbows, clogged strainers, etc. Damaged or worn parts, excessive discharge line restriction causing flow through the relief valve, or a faulty relief valve could also be the cause. Finally, ensure the vanes are correctly installed.

BLACKMER NP1.5B Specifications

General IconGeneral
ModelNP1.5B
CategoryPower Pump
Temperature Range-25°F to 225°F (-32°C to 107°C)
Seal TypeMechanical Seal
Port Size1.5 inch
Materials of ConstructionCast Iron
Inlet Size1.5 inch
Outlet Size1.5 inch

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