Bell and Gossett NBF-36

Other manuals for Bell and Gossett NBF-36

Installation, Operation & Service Instructions4 pages

Questions and Answers

B
Brittany MacdonaldAug 7, 2025
What to do if my Bell and Gossett NBF-36 has inadequate circulation?
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  Mariah HughesAug 7, 2025
  If your Bell and Gossett Water Pump has inadequate circulation, consider these steps: First, vent the system if it is air-bound. Second, check for any clogs in the impeller or piping and remove any obstructions. Third, if the impeller is damaged, replace the pump. Fourth, if the pump is too small, replace it if it is single speed, or switch to a higher setting if it is a three-speed pump. Fifth, vent the pump casing if the pump is partially air-bound. Finally, check the wiring and voltage if the motor speed is improper.
O
Olivia MannAug 12, 2025
What to do if my Bell and Gossett Water Pump has no circulation?
- D
  Donald SmithAug 12, 2025
  If your Bell and Gossett Water Pump has no circulation, here's what you can do: First, vent the system if it's air-bound. Second, check for any obstructions in the impeller or piping and remove them. Third, ensure the system valve is open. Finally, inspect the electrical circuit to make sure it is working properly.
J
Jeremy BrooksAug 17, 2025
Why is my Bell and Gossett NBF-36 Water Pump making noise?
- P
  Philip ShawAug 17, 2025
  Pump or system noise in your Bell and Gossett Water Pump can stem from a few issues. It could be due to entrained air, in which case you should vent the system. Pump cavitation might be the problem, requiring you to lower the pump, raise pressure, or relocate it. Excessive water velocity can also cause noise; consider installing balancing cocks or parallel piping. Lastly, pipe vibration can be a factor, so ensure adequate pipe support.
A
Austin OrtizAug 21, 2025
What causes premature failure of Bell and Gossett NBF-36 components?
- M
  Michael MartinAug 21, 2025
  Premature failure of components in your Bell and Gossett Water Pump can be caused by several factors. These include using an improper pump size or type (in which case you should replace it), an improper pump location (relocate the pump), excessive water treatment (check the manufacturer’s instructions), the pump operating close to or beyond the end point of curve (balance the system), or excessive piping load (provide proper pipe support).
T
tristan88Aug 27, 2025
What causes seal failures in Bell and Gossett NBF-36 Water Pump?
- M
  mhendersonAug 27, 2025
  Seal failures within a year in your Bell and Gossett Water Pump's closed system can be attributed to several causes: excessive dirt, sand, and oxides (clean the system); excessive or improper water treatment (check for proper water treatment recommendations from the pump manufacturer); pump cavitation due to improper selection or compression tank location (check pump operation on its curve, ensuring it's not overloading, and ensure a high head pump has a compression tank on the suction side); excessive temperatures (check the seal type and maximum operating temperature from the manufacturer); or running the pumps without fluid (pumps must be primed before operation).
A
Angela MooreSep 1, 2025
What causes seal pitting in Bell and Gossett NBF-36 Water Pump?
- B
  Brittney BlackSep 1, 2025
  Seal pitting, oxygen corrosion, and magnetic iron oxide in your Bell and Gossett Water Pump can be caused by wear and excessive amounts of free oxygen. Check if the system has a constant leak.

Summary

Product Description

Operational Specifications

Key operational limits including maximum pressure, temperature, and electrical ratings for the circulator.

Installation

Pump Location and Orientation

Flange Connection and Piping

Instructions for installing flange connectors, gaskets, and connecting suction/discharge piping securely.

Electrical Wiring and Grounding

Steps for safely wiring the pump motor, including grounding requirements and conduit box details.

Commissioning, Startup, Operation, and Shutdown

Operation Precautions and System Prep

Essential safety warnings for operation, including pressure limits, and steps to prepare the system.

Pump Startup and Speed Selection

Performance Characteristic Curves

Maintenance

Removing the Pump from Service

Detailed safety procedures and steps for safely disconnecting and removing the pump from an existing system.

Troubleshooting

Pumping System Troubleshooting Guide

A comprehensive table detailing common symptoms, their causes, and recommended remedies for system issues.

Troubleshooting Seal Failures and Cavitation

Bell and Gossett NBF-36 Specifications

General

Model	NBF-36
Series	NBF
Category	Water Pump
Manufacturer	Bell and Gossett
Maximum Working Pressure	175 psi
Maximum Operating Pressure	175 psi
Maximum Operating Temperature	250°F
Casing Material	Cast Iron
Seal Type	Mechanical Seal
Impeller Material	Bronze
Material	Cast Iron
Flange Drilling	ANSI 125