RIGBOOK

1 CONCEPTUAL DESIGN
- Derricks
Derricks and Masts consist of a steel framework with a square or rectangular cross-section.
Their purpose is to support the hoisting equipment and rack the tubulars while tripping.
The number of joints in a stand (single-double-triple) that the rig can pull is dependent on the height of the derrick.
- Manufacturer Specifications
Derricks are manufactured in accordance with API 4F or related ISO (International Organization for Standardization) 13626 draft.

This specifications covers the design, manufacture, and use of derricks, portable masts, crown block assemblies and substructures.

- Nameplate Information
Derricks built within API/ISO specs must have a specification nameplate attached in a visible place containing the following information:
a. MANUFACTURER’S NAME.
b. PLACE OF CONSTRUCTION.
c. STANDARD ADOPTED (ex. API 4F). d. SERIAL NUMBER.
e. HEIGHT ( ft ).
f. MAXIMUM STATIC HOOK LOAD ( lbs) FOR STATED NUMBER OF LINES TO TRAVELLING BLOCKS. g. MAX. RATED WIND VELOCITY (Knots) WITH RATED CAPACITY OF PIPE RACKED.
h. EDITION OF THE API  SPEC. USED
I.  GUYING DIAGRAM (when applicable)
j. The following note: “CAUTION: ACCELERATION OR IMPACT, ALSO SETBACK AND WIND LOADS WILL REDUCE THE MAXIMUM RATED STATIC HOOK LOAD CAPACITY.”k. LOAD DISTRIBUTION DIAGRAM.
l.  GRAPH PLOTTING MAX. ALLOWABLE STATIC HOOK LOAD VERSUS WIND VELOCITY. m. MAST SETUP DISTANCE FOR MAST WITH GUY LINES.

2 TYPES AND CHARACTERISTICS
There are 3 different types of derricks:
- DERRICK
- MAST
- RAM RIG

- DERRICK
Pyramidal steel framework with square or rectangular cross section assembled as fixed structure.
- API Definition
A semipermanent structure of square or rectangular cross-section having members that are latticed or trussed on all four sides.
This unit must be assembled in the vertical or operation position, as it includes no erection mechanism. It may or may not be guyed.

- Derrick dimensions
Table 1 - Derrick Sizes and General Dimensions

A - The vertical distance from the top of the base plate to the bottom of the Crown Block support
Beam.
B - The distance between heel to heel of adjacent legs.
C - The window opening measured in the clear and parallel to the center line of the derrick side from top of base plate.
D - The smallest clear dimension at the top of the derrick that would restrict passage of crown block.
E - The clearance between the horizontal header of the gin pole and the top of the crown support beam.

Derrick Types
Derrick are normally used on Offshore rigs and can be divided into categories:
- Stationary Derrick
Derrick used on offshore fixed structures
- Dynamic Derrick
Heavyweight derrick used on floating rigs subjected to marine stress.

Installation on offshore floating unit