OHS Code Explanation Guide

Published Date: July 01, 2009
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Part 37 Oil and Gas Wells

Section 763 Guy lines

Subsection 763(1)

All guy lines, as indicated by the manufacturer’s diagram, must be in position and properly tensioned prior to commencing any work. In the absence of manufacturer’s recommendations, or where the manufacturer’s recommendations cannot be implemented, the diagram shown in Figure 37.2 may be used.

Figure 37.2 Example of anchor location diagram

Other guying patterns may be used if certified by a professional engineer. Guy lines should be 6 x 19 or 6 x 37 class, regular lay, made of improved plow steel (IPS), or better, with independent wire-rope core (IWRC) and not previously used for any other application. Double saddle clips should be used and wire rope should be installed in accordance with the manufacturer’s recommendations.

Table 37.1 may be used as a guide to the pre-tensioning of guy lines. This method is commonly referred to as the Catenary Method or guy line sag method (see Figure 37.3).

Figure 37.3 Example of the Catenary Method

Table 37.1 Guide to pre-tensioning of guy wires

Guywire Sag (millimetres)

Distance Well to Anchor
(metres)

Pole Mast

Single Mast

Double Mast

Tubing Board Guy

Crown-
ground Guy

Tubing Board Guy

Crown-
ground Guy

Tubing Board Guy

Crown-
ground Guy

12

100

100

100

150

127

18

150

203

150

305

203

24

 

254

380

254

432

280

30

356

558

356

660

380

36

457

560

457

813

833

 

Pre-tension
(kilonewtons)

2225
(500 lbs force)

4450
(1000 lbs force)

2225
(500 lbs force)

4450
(1000 lbs force)

2225
(500 lbs force)

4450
(1000 lbs force)