Rathole

Rathole

Definition(s)

Rathole

A hole in the rig floor lined with a casing that projects above the floor into which the kelly and swivel are placed when hoisting operations are in progress.1    

Source(s)

1. Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations
Prime Mover

Prime Mover

Definition(s)

Prime Mover

An engine or motor whose main function is to drive or operate other mechanical equipment. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations  
Owner-user Inspection Agency

Owner-user Inspection Agency

Definition(s)

Owner-user Inspection Agency

An owner or user of pressure vessels who maintains a regularly established inspection department whose organization and inspection procedures have been accepted by the Division. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations    
Open Well Bore

Open Well Bore

Definition(s)

Open Well Bore

A well open to the atmosphere during well drilling, work-over, maintenance, repair or abandonment operations. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations
Oil Saver

Oil Saver

Definition(s)

Oil Saver

“Oil saver” means a pressure-sealing gland arrangement which is used to prevent the leakage and waste of gas, oil, or water around a wire line when servicing a well. It may be operated by mechanical or hydraulic means. [Mich. Admin. Code R 408 (2013)]. Source: Oil and Gas Drilling and Servicing Operations, Michigan Administrative Code R 408, February 8, 2013. Regulations

Oil Saver

A device used in conjunction with a wire line in an oil or gas well to direct liquids and gases from such wells into desirable outlets. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations  
Mousehole

Mousehole

Definition(s)

Mousehole

“Rathole” or “mousehole” means the temporary storage space that is used to store the kelly or drill pipe while adding a new section of pipe to the drill string at some rotary drilling rigs. Source: Division of Mineral Resources Management - Oil and Gas, Ohio Administrative Code, Chapter 1501:9, January 2012. Regulations

Mousehole

An opening through the rig floor, usually lined with pipe, into which a length of drill pipe is placed temporarily for later connection to the drill string. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations  
Monkey Board (Tubing Board or Racking Board)

Monkey Board (Tubing Board or Racking Board)

Definition(s)

Monkey Board (Tubing Board or Racking Board)

The derrickman's working platform. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations
Loading and Unloading Platform

Loading and Unloading Platform

Definition(s)

Loading and Unloading Platform

A platform giving access to the tops of tank cars, tank trucks and trailers and to overhead valves and pipes. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations
Ladder Offset Platform

Ladder Offset Platform

Definition(s)

Ladder Offset Platform

A platform installed on the derrick or mast at points where the ladder is offset to provide access from one ladder section to an adjacent offset section. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations
Ladder Climbing Assist Device (Angel Lift)

Ladder Climbing Assist Device (Angel Lift)

Definition(s)

Ladder Climbing Assist Device (Angel Lift)

A device consisting of a length of wire rope reeved over a sheave, with one end attached to a counterweight and the other end attached to a belt that passes under a person's buttocks. As a person ascends or descends the mast ladder, the device acts as an assist by lightening the person's weight. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations
Inside Derrick Platform

Inside Derrick Platform

Definition(s)

Inside Derrick Platform

A fixed platform for workers inside the derrick. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations
High Line

High Line

Definition(s)

High Line

A specially rigged rope used to convey pipe, drilling tools or other equipment from a derrick or mast to the derrick, catwalk or other location outside the derrick or mast. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations
Good Engineering Practice

Good Engineering Practice

Definition(s)

Good Engineering Practice

The use of mathematics, scientific formulae, manufacturer's data and/or experience by a qualified person to determine the elements of safety, such as stress values, strength of materials, overturning moments and factors of safety, of equipment and component parts. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations
Girt

Girt

Definition(s)

Girt

A cross-brace between the legs of a mast or derrick. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations
Gin Pole Mast

Gin Pole Mast

Definition(s)

Gin Pole Mast

A single or double leg type mast supported in working position by either guys or one or more auxiliary legs, normally used for supporting crown block and traveling block. This definition includes tripods. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations
Gas Free or Free of Gas

Gas Free or Free of Gas

Definition(s)

Gas Free or Free of Gas

Free from harmful or hazardous concentrations of vapors, fumes and gases. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations
Finger Brace

Finger Brace

Definition(s)

Finger Brace

A bar or structural steel shape secured to the finger board or to the derrick or mast members to resist horizontal movement of the finger. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations
Finger Board

Finger Board

Definition(s)

Finger Board

A support for the finger. It may be a timber, metal bar, structural steel shape, or inside derrick platform secured in the derrick or mast. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations  

Finger Board

"Finger board" means a support for the finger. It may be a metal bar, structural steel shape, or an inside derrick platform secured in the derrick tower. Source: State of Wyoming Occupational Safety and Health Rules and Regulations for Oil and Gas Well Drilling, Revised January 8, 2013. Regulations
Finger

Finger

Definition(s)

Finger

A bar or structural steel shape which serves as a restraining support for pipe or other equipment racked in a derrick or mast. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations  

Finger

"Finger" means a metal bar or structural steel shape which serves as a restraining support for pipe or other equipment racked in a derrick tower or mast. Source: State of Wyoming Occupational Safety and Health Rules and Regulations for Oil and Gas Well Drilling, Revised January 8, 2013. Regulations
Enclosed

Enclosed

Definition(s)

Enclosed

As applied to mechanical guarding means that the moving parts are so guarded that physical contact by parts of the body is precluded as long as the guard remains in place. This does not prohibit the use of hinged, sliding, or otherwise removable doors or sections to permit inspection or lubrication. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations
Effective

Effective

Definition(s)

Effective

Capable of performing with safety the particular function specified in the order. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations
Drilling (Hoisting) Line

Drilling (Hoisting) Line

Definition(s)

Drilling (Hoisting) Line

A wire line used in the main rig hoisting system. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations
Division

Division

Definition(s)

Division

“Division” means the division of oil and gas resources management, department of natural resources. Source: Division of Mineral Resources Management - Oil and Gas, Ohio Administrative Code, Chapter 1501:9, January 2012. Regulations  

Division

“Division” means division of oil and gas, Ohio department of natural resources. Source: Division of Mineral Resources Management - Oil and Gas, Ohio Administrative Code, Chapter 1501:9, January 2012. Regulations  

Division

“Division” means Division of Mineral Resources Management, Ohio department of natural resources. Source: Division of Mineral Resources Management - Oil and Gas, Ohio Administrative Code, Chapter 1501:9, January 2012. Regulations  

Division

“Division” means Division of Mineral Resources Management, department of natural resources. Source: Division of Mineral Resources Management - Oil and Gas, Ohio Administrative Code, Chapter 1501:9, January 2012. Regulations  

Division

“Division” means the New Mexico Energy, Minerals and Natural Resources Department, Oil Conservation Division. Source: Oil and Gas, New Mexico Administrative Code Title 19, Chapter 15, January 2013. Regulations  

Division

The Division of Occupational Safety and Health. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations      
Derrick Ladder or Mast Ladder

Derrick Ladder or Mast Ladder

Definition(s)

Derrick Ladder or Mast Ladder

Any fixed ladder providing access to any location in or on the derrick or mast. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations
Derrick Crown Platform (Runaround, Water Table)

Derrick Crown Platform (Runaround, Water Table)

Definition(s)

Derrick Crown Platform (Runaround, Water Table)

A continuous platform that provides access to the crown block assembly and warning lights. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations
Dead Line Stabilizer

Dead Line Stabilizer

Definition(s)

Dead Line Stabilizer

A device attached to the mast or derrick for restricting lateral movement of the dead line. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations
Dead Line

Dead Line

Definition(s)

Dead Line

The line (which does not travel) from the crown block sheave to the anchor. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations
DBBS

DBBS

Definition(s)

DBBS

Double block and bleeder system. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations
Crown Block Assembly

Crown Block Assembly

Definition(s)

Crown Block Assembly

An assembly of mechanical parts mounted on top of a derrick tower or mast, consisting of a framework to which a number of sheaves are fastened over which hoisting lines are reeved. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations
Corrosive

Corrosive

Definition(s)

Corrosive

A substance that causes visible destruction of, or irreversible alterations in, living tissue by chemical action at the site of contact. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations