Hole Temperature Trends

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SHOTPlus™ Variant:
Surface
Version:
> 6.21.4
KBA Summary:
This article describes how to view holes using the "Temperature Trend" view in Analytics view.

Introduction

An important aspect of managing hot and reactive ground is identifying holes where hole temperature is above ambient ground temperature or is increasing rapidly. This allows the engineer to identify where to apply controls to the blast to manage the hazard.

Users should exercise caution and ensure a thorough risk assessment is completed when using the Temperature Trends view as part of hot ground management procedures.

Important

The following information is currently only applicable to temperature measurements captured in BlastIQ™.

Definitions

Ambient ground temperature:
is the minimum recorded temperature in the blast.
Heat effected ground:
is ground that has a recorded temperature above ambient temperature and it can either be stable or unstable.
Stable:
is a hole that has a measured temperature increase over time, and this temperature change is within acceptable limits.
Unstable:
is a hole that has a measured temperature increase over time, and the change is not within acceptable limits.
Temperature trend:
is used to determine the temperature stability of a hole and usually consists of a series of at least three temperature measurements, normally taken at least a day apart.

Using the Temperature Trends view

  1. Open Analytics View in the View menu or by pressing Ctrl+Shift+E.
  2. Select Hole properties from the options on the right hand side, then select Temperature trend.
  3. Define the Temperature trigger by selecting either Absolute temperature or Range above ambient to classify holes as heat effected:
    1. Absolute temperature: Users define a temperature at which holes will be classed as heat effected if the last temperature recording is greater than or equal to the specified temperature. Holes with a recorded temperature less than the specified temperature will be classified as ambient.
      Use this trigger if you are interested in identifying heat effected holes without referring to ambient temperature, or have a site-specific definition of ambient temperature. 
    2. Range above ambient: Users define a temperature range at which holes will be classed as heat effected if the last temperature recording is greater than or equal to the ambient temperature plus the temperature range.  Holes that are less than the ambient temperature plus the temperature range are considered ambient.
      Use this trigger if you are identifying heat effected holes using ambient temperature.
  4. Define the temperature stability parameters to classify holes as stable or unstable:
    1. Time period, in days, over which the trend should be calculated (minimum 1 days).
    2. Temperature change, in degrees, which triggers an unstable hole (minimum 1°C).
    3. Minimum number of measurements against a hole for a valid trend (minimum 2).
    4. Colours for displaying ambient holes, heat effected (stable) holes and heat effected (unstable) holes.
  5. A summary of holes states can be found here.
  6. Hovering over a hole collar will show a graph of the recorded temperatures for that hole.

Information

Holes without a temperature reading will have a transparent display.

 

Example using "Absolute temperature"

In the image below, there are some examples of the three hole temperature states, which are:

  1. Ambient,
  2. Heat effected (stable)
  3. Heat effected (unstable)

  • Hole C2 does not have a measurement, so it does not have a temperature state.
  • Holes B1, B2, B3, C1 and C3 are classified as Ambient, as their last recorded temperatures (35°) are less than the absolute temperature (40°).
  • Hole A1 is classified as Heat effected (stable), as:
    • the last recorded hole temperature (40°C) is greater than or equal to the absolute temperature (40°C), and
    • the difference between the last two temperature measurements (40°C - 35°C =5°C) is less than or equal to the temperature change (5°C)

  • Hole A2 is classified as Heat effected (unstable), as:
      • the last recorded hole temperature (45°C) is greater than or equal to the absolute temperature (40°C), and
      • the difference between the last two temperature measurements (45°C - 35°C =10°C) is greater than the temperature change (5°C)

  • Hole A3 is classified as Heat effected (unstable), as:
    • the last recorded temperature (55°C) s greater than or equal to the absolute temperature (40°C), and
    • the difference between the last two temperature measurements (50°C - 35°C =15°C) is greater than or equal to the temperature change (5°C)
Example using "Range above ambient"

In the image below, there are some examples of the three hole temperature states, which are:

  1. Ambient,
  2. Heat effected (stable)
  3. Heat effected (unstable)

  • Hole C2 does not have a measurement, so it does not have a temperature state.
  • Holes B1, B2, B3, C1 and C3 are classified as Ambient, as their last recorded temperatures are equivalent to the minimum recorded temperature (35°)
  • Hole A1 is classified as Ambient, as the last recorded hole temperature (40°C) is less than the ambient temperature + the range above ambient temperature range (35°C + 8°C = 43°C).
  • Hole A2 is classified as Heat effected (stable), as:
    • the last recorded temperature (45°C) is greater than or equal to the ambient temperature + the range above ambient temperature range (35°C + 18°C = 43°C), and
    • the difference between the last two temperature measurements (45°C - 35°C =10°C) is less than or equal to the temperature change (10°C)

  • Hole A3 is classified as Heat effected (unstable), as:
    • the last recorded temperature (50°C) is greater than or equal to the ambient temperature + the range above ambient temperature range (35°C + 8°C = 43°C), and
    • the difference between the last two temperature measurements (50°C - 35°C =15°C) is greater than or equal to the temperature change (10°C)

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