PUP JOINT

A pup joint is a casing or tubing of length shorter than Range 1 with the same thread connection, used to adjust the length of tubular strings to its exact requirement.
Pup Joints are manufactured from AISI 4145H or 4140H-modified alloy, heat-treated to a Brinell Hardness range of 285-341 with a Charpy “V” notch minimum impact strength of 40 ft/lb at 70° F and one inch below the surface. Pup Joints are heat-treated to 110,000 PSI minimum yield. All connections are phosphate coated to impede galling during initial make-up.
They are available in standard lengths of 5’, 10’, 15’ and 20’ with other configurations upon request.
Integral Pup Joints dedicated to Sour Service applications are available. PJ -110 PUP S are Sour Service Pup Joint using ASCOWELL C material providing improved resistance to Sulfide Stress Cracking with high yield strength.
We can offers a wide range drill string products and accessories with standard API or proprietary high performance
connections to meet the most demanding drilling requirements.
 

Tubing Pup Joint Specifications
Outside Diameter	1.05 ~ 4-1/2 in (26.67 ~ 114.3 mm) nominal size OD
Weight	Standard or Heavy Wall
Length	2, 3, 4, 5, 6, 8, 10, 12 ft (with other lengths available upon request)
Grade	H40, J55, L80, N80/Q, C90, T95, P110
Connection	EUE, NUE
Standard	API 5CT, API 5B

 

Casing Pup Joint Specifications
Outside Diameter	4-1/2 ~ 20 in (114.3 ~ 508 mm) nominal size OD
Weight	Standard or Heavy Wall
Length	2, 3, 4, 5, 6, 8, 10, 12, 14, 16, 18, 20 ft (with other lengths available upon request)
Grade	H40, J55, K55, L80, N80/Q, C90, T95, P110, Q125
Connection	BTC, STC, LTC
Standard	API 5CT, API 5B

API Spec 5CT – This Standard specifies the technical delivery conditions for steel pipes (casing, tubing and pup joints), coupling stock, coupling material and accessory material and establishes requirements for three Product Specification Levels (PSL-1, PSL-2, PSL-3). The requirements for PSL-1 are the basis of this Standard. The requirements that define different levels of standard technical requirements for PSL-2 and PSL-3, for all Grades except H-40, L-80 9Cr and C110, are contained in Annex H.

Chemical Composition

Standard	Grade	Chemical compositions（％）
API SPEC 5CT	J55	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	V
	K55	0.34～0.39	0.20～0.35	1.25～1.50	≤0.020	≤0.015	≤0.15	≤0.20	≤0.20	/	/
	N80	0.34～0.38	0.20～0.35	1.45～1.70	≤0.020	≤0.015	≤0.15	/	/	/	0.11～0.16
	L80	0.15～0.22	≤1.00	0.25～1.00	≤0.020	≤0.010	12.0～14.0	≤0.20	≤0.20	/	/
	P110	0.26～0.395	0.17～0.37	0.40～0.70	≤0.020	≤0.010	0.80～1.10	≤0.20	≤0.20	0.15～0.25	≤0.08

Mechanical properties

Grade	Type	Total elongation under load (%)	Yield strength (min)	Yield strength (max)	Tensile strength min Mpa	Hardness Max (HRC)	Hardness Max (HBW)
J55	-	0.5	379	552	517	-	-
K55	-	0.5	379	552	655	-	-
N80	1	0.5	552	758	689	-	-
N80	Q	0.5	552	758	689	-	-
L80	1	0.5	552	655	655	23	241
L80	9Cr	0.5	552	655	655	23	241
L80	13Cr	0.5	552	655	655	23	241
C90	-	0.5	621	724	689	25.4	255
C95	-	0.5	655	758	724	-	-
T95	-	0.5	655	758	724	25.4	255
P110	-	0.6	758	965	862	-	-
Q125	All	0.65	862	1034	931	-	-

Painting&coating
The anti-corrosion of petroleum casing is mainly divided into three types:
Brush the anti-corrosive coating on the outer wall.
Brush anti-corrosion coating on the inner wall.
Brush the anti-corrosive and cooling coating.
With the use of oil casings and pup joint in harsh oil extraction industries such as the polar and marine. It requires the material and structure of petroleum pup joint, and it must have good nodality, excellent physical properties, stable chemical properties, and a wide range of temperature adaptation. If the oil casing cannot be made, it should be coated with an anti-corrosive coating to help him cope with the harsh environment. The coating on the outer wall is used to reduce external corrosion, and the anti-corrosion coating on the inner wall is to reduce friction, reduce corrosion in the pipe, and increase the amount of oil transported. Anti-corrosive insulation coating is used to transport crude oil and fuel oil, and reduce the heat emitted from the pipeline to the soil.