A flange affixed at the top of the casing string used to attach the production equipment; this surface can be used as a log-zero reference point
CT
Center
DO
Double End Overhang
DT
Downstream Tap
The tap source or location for the static pressure being measured is from the downstream port of the flange or pipe tap; "Downstream Tap" terminology is used to indicate the source of the static pressure being measured and/or the application in the volume calculation
DU
Dual Fuel Tank Position
EX
Exterior
FR
Front
FS
Front Spare
GF
Rig Floor
The platform of a drilling rig or derrick on which drilling operations are carried out; this surface can be used as a log-zero reference point
IN
Inside
IT
Interior
KB
Kelly Bushing
A device fitted to the rotary table through which the kelly passes and by means of which the torque of the rotary table is transmitted to the kelly and to the drillstem; this surface can be used as a log-zero reference point
LC
Less Critical Surface
LO
Lower
LT
Left
M1
Multiple
MC
More Critical Surface
MD
Middle
NS
Not Specified
NT
Next Relative Position
OA
Overall
OS
One Side
OT
Outside
R0
Relative Position 10
R1
Relative Position 1
R2
Relative Position 2
R3
Relative Position 3
R4
Relative Position 4
R5
Relative Position 5
R6
Relative Position 6
R7
Relative Position 7
R8
Relative Position 8
R9
Relative Position 9
RA
Relative Position 11
RB
Relative Position 12
RC
Relative Position 13
RD
Relative Position 14
RE
Relative Position 15
RF
Relative Position 16
RG
Relative Position 17
RH
Relative Position 18
RI
Relative Position 19
RJ
Relative Position 20
RK
Relative Position 21
RL
Relative Position 22
RM
Relative Position 23
RN
Relative Position 24
RO
Relative Position 25
RP
Relative Position 26
RQ
Relative Position 27
RR
Relative Position 28
RS
Relative Position 29
RT
Relative Position 30
RU
Relative Position 31
RV
Relative Position 32
RW
Relative Position 33
RX
Relative Position 34
RY
Relative Position 35
RZ
Relative Position 36
S1
Relative Position 37
S2
Relative Position 38
S3
Relative Position 39
S4
Relative Position 40
S5
Relative Position 41
S6
Relative Position 42
S7
Relative Position 43
S8
Relative Position 44
S9
Relative Position 45
SA
Relative Position 46
SB
Right
SC
Relative Position 47
SD
Relative Position 48
SE
Relative Position 49
SF
Relative Position 50
SL
Schnabel
Used to describe position of a transportation load located between two ends of wheelsets in such a way that the load itself makes up part of the equipment
SN
Stone
SP
Spare Tire Position
SS
Rear Spare
ST
Stucco
SU
Sub-sea
Depth measured below sea level; this surface can be used as a log-zero reference point
TB
Tank Bottom
TP
Top
TS
Two Sides
UC
Under Cab
UN
Unilateral
UP
Upper
UT
Upstream Tap
The tap source or location for the static pressure being measured is from the upstream port of the flange or pipe tap; "Upstream Tap" terminology is used to indicate the source of the static pressure being measured and/or the application in the volume calculation