4.1.26
lot
pieces of steel, with the same nominal dimensions and from a single heat, which are subsequently heat-treated as part of the same continuous operation (or batch)
4.1.27
low-stress steel stamps
steel stamps that do not contain any sharp protrusions on the marking face
4.1.28
lower kelly valve
kelly cock
essentially full-opening valve installed immediately below the kelly, with outside diameter equal to the tool joint outside diameter, that can be closed to remove the kelly under pressure and can be stripped in the hole for snubbing operations
4.1.29
make-up shoulder
sealing shoulder on a rotary shouldered connection
4.1.30
non-pressure flank - box
thread flank closest to the make-up shoulder where no axial load is induced from make-up of the connection or from tensile load on the drill stem member
4.1.31
non-pressure flank - pin
thread flank farthest from the make-up shoulder where no axial load is induced from make-up of the connection or from tensile load on the drill stem member
4.1.32
out-of-roundness
difference between the maximum and minimum diameters of the bar or tube, measured in the same cross-section, and not including surface finish tolerances outlined in 8.1.4
4.1.33
pin end
external (male) threads of a threaded connection
4.1.34
process of quenching
hardening of a ferrous alloy by austenitizing and then cooling rapidly enough so that some or all of the austenite transforms to martensite
4.1.35
process of tempering
reheating a quench-hardened or normalized ferrous alloy to a temperature below the transformation range and then cooling to soften and remove stress
4.1.36
reference dimension
dimension that is a result of two or m。re other dimensions
4.1.37
rotary shouldered connection
connection used on drill stem elements, which has coarse, tapered threads and sealing shoulders
4.1.38
stress-relief features
modification performed on rotary shouldered connections by removing the unengaged threads on the pin or box to make the joint more flexible and to reduce the likelihood of fatigue-cracking in highly stressed areas
4.1.39
sub
short drill stem members with different rotary shouldered connections at each end for the purposes of joining unlike members of the drill stem
4.1.40
swivel
device at the top of the drill stem that permits simultaneous circulation and rotation
4.1.41
tensile strength
maximum tensile stress that a material is capable of sustaining that is calculated from the maximum load during a tensile test carried to rupture and the original cross-sectional area of the specimen
4.1.42
tensile test
mechanical test used to determine the behavior of material under axial loading
4.1.43
test pressure
pressure above working pressure used to demonstrate structural integrity of a pressure vessel
4.1.44
thread form
thread profile in an axial plane for a length of one pitch
4.1.45
tolerance
amount of variation permitted
4.1.46
tool joint
heavy coupling element for drill pipe having coarse, tapered threads and sealing shoulders
4.1.47
upper kelly valve
kelly cock
valve immediately above the kelly that can be closed to confine pressures inside the drill stem
4.1.48
working pressure
pressure to which a particular piece of equipment is subjected during normal operation
4.1.49
working temperature
temperature to which a particular piece of equipment is subjected during normal operation
Abstract from Specification for Rotary Drill Stem Elements API 7-1 / ISO 10424
