SUB INSPECTION
Réf doc LS.PRT.TUB.068 Type doc Procédure Technique Nombre de page
Date création Emis pour Rédiger par Vérifier par Approuver par
25.10.2021 Approbation NKOLO ALAIN NKOLO ALAIN DIALLO O TANOU Rev : 00
Signature
Réf.: LS.PRT.TUB.068 Date création: 25.10.2021
Type Doc. : Procédure Technique Discipline : QUA Revision: 000
SUB INSPECTION Page : 1 / 5
SOMMAIRE
1 Scope :.................................................................................................................................................2
2 Préparation :........................................................................................................................................2
3 Equipment Required :..........................................................................................................................2
4 Stress Relief Features Required on BHA Subs:....................................................................................2
5 Visual Connection Inspection :............................................................................................................2
6 Dimensional Inspection :...................................................................................................................2
7 Blacklight Connection Inspection :.......................................................................................................4
8 Visual body inspection :...................................................................................................................4
9 Magnetic Particle Body Inspection :....................................................................................................4
10 Post-inspection Requirements :.........................................................................................................4
LEIF SHERIF BP : 2267 Port-Gentil
Tél : 077.29.61.61/062.01.37.43/077.31.29.66
E-mail: liftingleifsherif2@mail.com/sherifleif@gmail.com
Réf.: LS.PRT.TUB.068 Date création: 25.10.2021
Type Doc. : Procédure Technique Discipline : QUA Revision: 000
SUB INSPECTION Page : 2 / 5
1 Scope :
This procedure covers the inspection requirements and acceptance criteria for rotary
drilling subs. Included are both ferromagnetic and nonmagnetic components.
2 Préparation :
Record the tool serial number and description. Reject the tool if no serial number can
be located unless the customer waives this requirement.
3 Equipment Required :
The following equipment must be available for inspection: Paint marker, pit gage, a light
capable of illuminating the entire inter nal surface, metal scale, tape measure, flat file or
disk grinder
4 Stress Relief Features Required on BHA Subs:
Bit subs and subs joining other BHA connections, with connections NC38 and larger, shall
have pin stress relief grooves and boreback boxes or they shall be rejected. (Note: Special
purpose subs may require inside diameters that do not accommodate a boreback box. When
this occurs, specific dimensional acceptance criteria from the special sub manufacturer
shall apply.)
5 Visual Connection Inspection :
Inspect the connections in accordance with procedure 3.11, omitting sections 3.11.3a and
3.11.4a.
6 Dimensional Inspection :
a. Inspect the connections of bit subs and subs that will join other BHA connections in
accordance with procedure 3.14, Dimensional 3 Inspection, except that bevel diameter
shall meet the requirements in steps b-d below, whichever applies.
b. Bit subs and other sub connections that will join BHA components, except HWDP:
Use bevel diameter from table 3.8.
c. Sub connections joining HWDP: Use bevel diameters from table 3.9.1 3.9.6, as
applicable.
d. For bit sub connections joining bits: Use the following bevel diameter ranges.
Bevel Diameter (in)
LEIF SHERIF BP : 2267 Port-Gentil
Tél : 077.29.61.61/062.01.37.43/077.31.29.66
E-mail: liftingleifsherif2@mail.com/sherifleif@gmail.com
Réf.: LS.PRT.TUB.068 Date création: 25.10.2021
Type Doc. : Procédure Technique Discipline : QUA Revision: 000
SUB INSPECTION Page : 3 / 5
Connection Minimum Maximum
2-3/8 Reg 3 1/32 3-1/16
2-7/8 Reg 3-19/32 3-5/8
3-1/2 Reg 4-3/32 4-1/8
4-1/2 Reg 5-5/16 5 11/32
6-5/8 Reg 7-11/32 7-3/8
7-5/8 Reg 8-29/64 8-31/64
8-5/8 Reg 9-17/32 9-9/16
e. Inspect the connections of subs that will join drill pipe connections or
lower kelly connections in accordance with procedure 3.13, Dimensional
2 Inspection.
f. Tong space: Minimum tong space shall be 7 inches.
g. Inside Diameter: Subs with the same connection top and bottom shall have straight
bores with inside diameter (ID) not greater than the ID of the largest pin to which the
sub will be joined. Subs with different connections top and bottom may be equipped
with step bores. In these subs, the torsional capacity of the pin with the larger ID
may not be less than the torsional capacity of the connection on the other end of the
sub.
h. Corner radius: The corner radius on type B subs shall be between 1.5 and 2 inches
for subs manufactured in accordance with the 39th edition of API Specification 7.
Tools manufactured to earlier editions shall be acceptable with the 1-inch radius.
i. Length: Measure overall length shoulder to shoulder. Measure neck length on type
B Subs. Subs shall meet the length requirements below or shall be rejected.
For type B subs only. Minimum overall length requirement does not apply. The
minimum fishing neck length is 18 inches and the minimum tong space is 7 inches.
The maximum OD taper angle shall not exceed 45 degrees.
j. Float bore dimensions: On bit subs equipped with float bores, the ID shall be free of
flaws or pitting that will interfere with the valves ability to seal. Float bore dimensions
shall meet the float bore dimensions in figure 3.25.2 and the following: In cases
where two or more float valves are recognized, the inspector shall consult with the
customer to determine which size will be used prior to proceeding with the
inspection.
7 Blacklight Connection Inspection :
Inspect the end connections in accordance with procedure 3.15, Blacklight Connection Inspection. If
the sub is non- magnetic, substitute procedure 3.17, Liquid Penetrant Inspection, instead of
Blacklight Connection Inspection.
LEIF SHERIF BP : 2267 Port-Gentil
Tél : 077.29.61.61/062.01.37.43/077.31.29.66
E-mail: liftingleifsherif2@mail.com/sherifleif@gmail.com
Réf.: LS.PRT.TUB.068 Date création: 25.10.2021
Type Doc. : Procédure Technique Discipline : QUA Revision: 000
SUB INSPECTION Page : 4 / 5
8 Visual body inspection :
a. Surface Condition: Visually examine the outside surface of the sub from
shoulder to shoulder for mechanical damages. Any cut, gouge or similar
imperfection deeper than 10% of the adjacent wall shall be rejected.
b. Markings: The sub shall have a marking recess which shall show the
manufacturer’s name or mark, the words "SPEC 7," the upper and lower sub
connections and the inside diameter(s) of the sub. Information listed on the
markings shall conform to the actual ID(s) and connections on the sub. (Subs
which do not show these marks do not comply with API Specification 7).
9 Magnetic Particle Body Inspection :
Inspect the outside diameter from shoulder to shoulder in accordance with procedure 3.9, MPI
Slip/Upset Inspec- tion. Any crack indication, regardless of orientation, shall be rejected. If the sub is
manufactured from non-magnetic materials, procedure 3.17, Liquid Penetrant Inspection, shall be
substituted for Magnetic Particle Inspection.
10 Post-inspection Requirements :
Clean and dry the connections and thread protectors. Apply thread compound and apply thread
protectors. Place a 2-inch wide white paint band around an acceptable tool. The paint band
should be 6 inches + 2 inches from the box end. Using a permanent paint marker on the outer
surface of the tool, write or stencil the words "DS-1T" Sub Inspection,” the date, and the
name of the company performing the inspection.
LEIF SHERIF BP : 2267 Port-Gentil
Tél : 077.29.61.61/062.01.37.43/077.31.29.66
E-mail: liftingleifsherif2@mail.com/sherifleif@gmail.com
