Rig Safety

8/13/2019 Rig Safety

1/20

Rig Safety

Randy A. McClay, P.E., CSP

Exran Consulting


2/20

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


3/20

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


4/20

Rig Safety Includes

Operations

A topic for another day

Maintenance

Inspection

Repair


5/20

API 4G4.2.1 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.


6/20

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.


7/20

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.


8/20

ANSI B30.6 Derricks1969

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.


9/20

Collapsed Hydraulic Ram


10/20

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.


11/20

API 4GFrequency 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


12/20

Cross Brace Failure


13/20

6.2.1 Category I

Visual observation of the mast/derrick and

substructure by rig personnel during

operations for indications of inadequate

performance.


14/20

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.


15/20

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.


16/20

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.


17/20

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.


18/20

Modified


19/20

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.


20/20

THANK YOU

QUESTIONS?

Rig Safety

Documents