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Rig Safety
Randy A. McClay, P.E., CSP
Exran Consulting
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What is a Rig Derrick?
Derricks get their name from a hangman who
plied his trade in Tyburn, England (today a
suburb of London), in the 1600s. Even though
Dericks first name is unknown, his gallows
were so distinctive that everyone began
calling any towerlike structure with cross
braces and girders a Derick. BY the 19thcentury, scholars had added a the extra r.
A Primer of Oilwell Drilling - PETEX
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The Hoisting System
To do the job of drilling
a well equipment must
include a hoisting
system, such as shownto the left.
A Primer of Oilwell Drilling - PETEX
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Rig Safety Includes
Operations
A topic for another day
Maintenance
Inspection
Repair
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API 4G 4.2.1 General
Inspection, maintenance and repairprocedures should be carried out by a personwho, by possession of a recognized degree,
certificate, or professional standing, or who byknowledge, training, or experience, hassuccessfully demonstrated the ability to solveor resolve problems relating to the subject
matter, the work, or the subject. Inspectorsshould be familiar with the type of equipmentto be evaluated.
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9.2.1 Name Plate
Masts and derricks should have a permanent
nameplate attached to the structure indicating
the following:
Name of manufacturer.
Model number and serial number.
Rating including static hook load capacity with
number of lines strung to the traveling block.
If guying is applicable, denote the recommended
guying patterns.
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OSHA 1910.181(b)(2)
"New and existing equipment." All new
derricks constructed and installed on or after
August 31, 1971, shall meet the design
specifications of the American National
Standard Safety Code for Derricks, ANSI B30.6-
1969, which is incorporated by reference as
specified in Sec. 1910.6.
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ANSI B30.6 Derricks 1969
6-1.2.1 General
Derricks shall be constructed to adequately
meet all stresses imposed on main members
and components under normal operating
conditions when properly installed and
handling loads not exceeding manufacturer's
load ratings with recommended reeving.
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Collapsed Hydraulic Ram
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API RP 4G - Inspection
The objective of these inspections is to detectdefects.
Prompt attention may be required to
determine if it is necessary to remove theequipment from service immediately or toconduct the appropriate repair.
Any significant manufacturing defectsdiscovered should be repaired or replaced,and reported to the manufacturer.
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API 4G Frequency of Inspection
The following inspection types and frequency
are recommended.
Category Daily Rig Up 2-Year 10-Year Documentation
I X Optional
II X Optional
III X Equipment File
IV X Equipment File
Inspection Types and Frequency
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Cross Brace Failure
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6.2.1 Category I
Visual observation of the mast/derrick and
substructure by rig personnel during
operations for indications of inadequate
performance.
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6.2.2 Category II
Category I inspection plus a more thorough
inspection of, but not limited to, load bearing
areas and sheaves for cracks, damage,
corrosion, loose or missing components andpremature wear. This more detailed
inspection should be performed during rig up
operations.
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6.2.3 Category III
A thorough visual inspection of all load bearing
components and members should be conducted to
determine the condition of the mast/derrick and
substructure and documented on the checklist inAppendix A, B, C, or D as applicable. The completed
(and signed) checklist, as well as any major repairs
completed, are to be documented in the permanent
rig file. Inspections on well servicing, truck or trailermounted masts should include observation of rig
up/rig down operations.
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6.2.4 Category IV
A Category III inspection, plus the equipment
is to be disassembled and cleaned to the
extent necessary to conduct NDT of all defined
critical areas. An ultrasonic thickness test isrecommended on all tubular style (or closed
style) members to test for internal corrosion.
Internal cameras, usually run on cable, mayalso be used to visually inspect for internal
corrosion.
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8.2 Design & Modification
The designer of modifications to drillingstructures should take into account the impact ofsuch modifications on operating capacities,environmental loads, erection loads,
transportation loads, lifting load, structuraloverturning and foundation requirements, andother conditions as may be applicable.Fabrication associated with such modifications
should be done under the governance of aqualified quality assurance program inaccordance with the instructions of theprofessional engineer.
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Modified
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4.1.2 User/Owner Procedure
Development
If the manufacturer of the equipment no
longer exists or is unable for any reason to
provide suitable recommendations, the
user/owner should develop inspection,maintenance and repair procedures including
utilizing applicable API recommended
practices and specifications.
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THANK YOU
QUESTIONS?