Pajari Instruments Ltd., since 1945




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   Rod Insertion Surveying

Diagram - not to scale


This method is used for a wide range of applications when cable lowering is not an option because the holes are in shallow, horizontal or upward directions and for other applications such as conventional drilling. It can be used for either cased or uncased holes that are larger than 35.6mm (1.4).

The survey train includes a connector which attaches the instrument to the insertion rods or drill rods. These rods are used to move the instrument to the survey location and then retrieve the instrument after the survey has been recorded.

Centralizers are used to improve parallelism between the axes of the instrument and the borehole. They are not required for holes which are close to the diameter of the instrument. Aluminum rods between the centralizers can be used to increase surveying accuracy. Sinker rods can also be used to increase the survey trains weight which results in faster lowering speeds in water filled holes.

Other arrangements of the survey train are possible to reduce weight which can be helpful in many applications such as inserting  the survey train into short holes by hand. Rod insertion surveying is typically used when the drill is no longer on the site or for other applications such as conventional drilling.

Information to provide when requesting a quotation:

If available, please includes details about your surveying application so we can provide a detailed quotation and/or additional information. Common details to include are:

  • What is the diameter of the hole?

  • What is the direction (upward, downward, horizontal, etc) of the hole?

  • What is the length of the hole?

  • Is the hole water filled?

  • Is the hole cased?

  • If the hole is cased, what material (steel, plastic, etc) is it cased with?

  • If the hole is cased, what is the inside diameter of the casing?


Tropari SDP applications with magnetic azimuth measurements:

Please note that the Tropari SDP is a magnetic azimuth instrument. It does not measure azimuth direction while inside holes that are cased in steel or while inside steel drill rods. Azimuth measurements can be performed in uncased holes and holes that are cased in non-magnetic materials such as plastic. The survey train for this surveying method includes non-magnetic rods which extend the instrument beyond the magnetic influence of the cable and cable swivel.


Pajari Instruments Ltd. 2015

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