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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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Derricks and Portable Masts 509<br />

c. Horizontal load at racking platform, derived from maximum rated wind<br />

velocity with setback of not less than 93 knots acting on full pipe<br />

setback.<br />

d. Horizontal load at racking platform from pipe lean.<br />

Mast with Guy Lines<br />

1. Operating loads (no wind load) composed of the following loads in<br />

combination:<br />

a. Maximum rated static hook load for each applicable string up condition.<br />

b. Dead load of mast assembly.<br />

c. Horizontal and vertical components of guy line loading.<br />

2. Wind loads composed of the following loads in combination:<br />

a. Wind load on mast, derived from a maximum rated wind velocity with<br />

setback of not less than 60 knots.<br />

b. Dead load of mast assembly.<br />

c. Horizontal loading at racking board, derived from a maximum rated<br />

wind velocity with setback of not less than 60 knots, acting on full pipe<br />

setback.<br />

d. Horizontal and vertical components of guy line loading.<br />

e. Horizontal and vertical loading at rod board, derived from a maximum<br />

rated wind velocity with setback of not less than 60 knots, acting on<br />

rods in conjunction with dead weight of rods.<br />

3. Wind loads composed of the following loads in combination:<br />

a. Wind load on mast, derived from a maximum rated wind velocity with<br />

setback of not less than 60 knots.<br />

b. Dead load of mast assembly.<br />

c. Horizontal loading at racking platform, derived from a maximum rated<br />

wind velocity with setback of not less than 60 knots, acting on full pipe<br />

setback.<br />

d. Horizontal and vertical components of guy line loading.<br />

4. Wind loads composed of the following loads in combination:<br />

a. Wind load on mast derived from a maximum rated wind velocity without<br />

setback of not less than 60 knots.<br />

b. Dead load of mast assembly.<br />

c. Horizontal and vertical components of guy line loading.<br />

5. Erection loads (zero wind load) composed of the following loads in<br />

combination:<br />

a. Forces applied to mast and supporting structure created by raising or<br />

lowering mast.<br />

b. Dead load of mast assembly.<br />

6. Guy line loading (assume ground anchor pattern consistent with manufacturer’s<br />

guying diagram shown on the nameplate).<br />

a. Maximum horizontal and vertical reactions from conditions of loading<br />

applied to guy line.<br />

b. Dead load of guy line.<br />

c. Initial tension in guy line specified by mast manufacturer.<br />

Mast without Guy Lines<br />

1. Operating loads composed of the following loads in combination:<br />

a. Maximum rated static hook load for each applicable string up condition.<br />

b. Dead load of mast assembly.

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