7.8104.5 Gauges

Topic: 
Water Heating
Subtopic: 
Distribution
Desired Outcome: 
Gauges will provide accurate information to allow for safe and reliable operation of water heating system
TitleSpecification(s)Objective(s)
7.8104.5a
System analysis

System design specifications will be reviewed and understood

Properly install the correct gauges in the correct location

7.8104.5b
Calibration

Calibration for analog gauges will be verified

Digital gauges will be calibrated

Provide accurate measurements

7.8104.5c
Range

A gauge will be selected with an appropriate range for the design specifications

Provide accurate measurement

7.8104.5d
Dissimilar metals

When connecting a nonferrous metal pump to existing ferrous piping, a plastic-lined steel nipple a minimum of one pipe diameter in length will be installed to connect the two pipes

Minimize corrosion between dissimilar metals

7.8104.5e
Accessibility

Gauges will be selected that can be easily read for light conditions

Gauges will be installed so they can be easily read (e.g., not facing the wall)

Allow for easy reading

7.8104.5f
Location

Temperature gauges will be installed so they are not adversely affected by other equipment through heat conduction

Pressure gauges will be installed so they are not adversely affected by turbulent flow and vibration

Provide accurate measurements

7.8104.5g
Placement: surface-mount thermometer

Thermocouple for digital gauges will be installed tightly to the pipe

Thermocouple for digital gauges will be wrapped with insulation to exclude ambient temperature

Provide accurate measurements

7.8104.5h
Placement: wet-mount thermometer

Gauges will be installed so they are not in an air pocket (e.g., install on side of pipe, not on top of side-plumbed tanks)

Measure fluid temperature, not air temperature

7.8104.5i
Installation

Gauges will be installed in accordance with manufacturer specifications

An isolation valve will be installed to allow pressure gauges to be replaced

Gauges will be installed in a location (where possible) that allows instructions to be easily read without the need of a ladder or step stool

Provide accurate measurements