Description
EUE, NUE, STC, LTC and BTC Couplings in J55, N80, L80, P110 and Project-Specified Grades
RIGRS supplies API 5CT tubing couplings and casing couplings for production, completion, workover and casing-string applications.
Available connection types include:
EUE Tubing Coupling
NUE Tubing Coupling
STC Casing Coupling
LTC Casing Coupling
BTC Casing Coupling
Special Clearance Coupling
Special Bevel Coupling
Reducing / Combination Coupling
Project-Specified Premium Coupling
Couplings are selected by pipe OD, wall thickness, steel grade, thread typy and service condition.
For Fast Quotation, Please Send:
Tubing or casing size
Pipe weight / wall thickness
Steel grade
Thread type
Coupling type
Quantity
Sour-service requirement
Destination country or port
Send Size + Grade + Thread
Get Coupling Price & Delivery
Email: info@apidrillpipe.com
WhatsApp: +8618615995257
ELITE tubing coupling & casing coupling
1.Standard coupling
2.Special clearance coupling
3.Special bevel coupling
4.API Modified Seal-Ring Coupling (Sr13)
5.Combination coupling or Reducing coupling
6.Premium Coupling
Tubing Coupling vs Casing Coupling
| Feature | Tubing Coupling | Casing Coupling |
|---|---|---|
| Main Use | Production / injection / workover tubing | Surface / intermediate / production casing |
| Common Threads | EUE, NUE | STC, LTC, BTC |
| Typical Size Range | Smaller OD | Larger OD |
| Primary Selection | OD, weight, grade, EUE/NUE | OD, weight, grade, STC/LTC/BTC |
| Well Function | Fluid production / injection | Wellbore structural support |
LTC / LC Casing Couplings
LTC casing couplings are used with API long round-thread casing connections and are available for multiple casing sizes and steel grades.
RIGRS can supply 8-5/8 in casing couplings with LTC connections according to the specified casing grade, weight and service condition.
Modified Seal-Ring Coupling
Modified seal-ring couplings can be supplied for project-specific tubing or casing connection requirements where an additional sealing arrangement is specified.
Special Clearance Coupling
Special-clearance couplings are used where reduced coupling OD is required for restricted annular or wellbore clearance.
Customer-Specified Premium Couplings
Premium-connection couplings can be reviewed according to customer-approved drawings, licensed specifications or other authorized connection requirements. Connection compatibility should not be assuming from trade names alone.
Couplings for Sour Service
For H2S-containing service, coupling material, hardness and heat treatment should be specified according to the approved project requirement. Where NACE / ISO 15156 requirements apply, the requested material condition and documentation should be stating in the RFQ.
Pipe grade
H2S / sour-service requirement
Operating temperature
Required hardness limit
NACE / ISO 15156 requirement, if specified
Required inspection documentation
Material and Heat Treatment
Coupling material and heat treatment should match the required tubing or casing grade and service condition. Buyers should confirm the pipe grade, coupling grade, heat-treatment requirement, hardness limit, sour-service requirement and material-certificate requirement.
What are the main purposes of the pipe and casing joint?
Main uses of tubing and casing couplings.
Connect tubing joints in production strings.
Connect casing joints in surface, intermediate and production casing.
Provide leak-tight threaded connections under high pressure.
Enable easy replacement of damaged tubing or casing sections.
API coupling technical parameters
The table below shows typical dimensions of API 5CT tubing coupling,line pipe coupling and casing couplings, including outside diameter, inside diameter and critical thread and shoulder dimensions for grades such as J55, N80, G105 and S135.
ELITE tubing coupling
| Size | Thread | Grade | PSL |
| 2-3/8″ | NU/EU SCC/S13 |
C110 C90 H40 J55 K55 N80Q N801 R95 L80-1 P110 Q125 |
PSL-1 PSL-2 PSL-3 |
| 2-7/8″ | NU/EU SCC/S13 |
||
| 3-1/2″ | NU/EU SCC/S13 |
||
| 4″ | NU/EU S13 |
||
| 4-1/2″ | NU/EU S13 |
Casing coupling
| Size | Thread | Grade | PSL |
| 4-1/2″ | SC/LC/BC | C110 C90 H40 J55 K55 N80Q N801 R95 L80-1 P110 Q125 |
PSL-1 PSL-2 PSL-3 |
| 5″ | SC/LC/BC | ||
| 5-1/2″ | SC/LC/BC | ||
| 6-5/8″ | SC/LC/BC | ||
| 7″ | SC/LC/BC | ||
| 7-5/8″ | SC/LC/BC | ||
| 8-5/8″ | SC/LC/BC | ||
| 9-5/8″ | SC/LC/BC | ||
| 10-3/4″ | SC/BC | ||
| 11-3/4″ | SC/BC | ||
| 13-3/8″ | SC/BC | ||
| 16″ | SC/BC | ||
| 18-5/8″ | SC/BC | ||
| 20″ | SC/LC/BC |
ELITE line pipe coupling
| Size | Coupling | Grade |
| 2″ | LP | L175 or A25 L210 or A L245 or B |
| 2-1/2″ | LP | |
| 3″ | LP | |
| 3-1/2″ | LP | |
| 4″ | LP | |
| 5″ | LP | |
| 6″ | LP | |
| 8″ | LP | |
| 10″ | LP | |
| 12″ | LP | |
| 14D” | LP | |
| 16D” | LP | |
| 18D” | LP | |
| 20D” | LP |
FAQ about API tubing and casing couplings
Tubing coupling are used to connect tubing joints in the production string, while casing couplings connect casing joints that support the wellbore. Tubing couplings are typically EUE or NUE, and casing couplings are usually BTC, LTC or STC.
We can supply couplings in J55, K55, N80, L80, P110 and other API 5CT grades, matching your tubing or casing string design.
Standard API 5CT sizes from 2 3/8″ to 4 1/2″ for tubing and from 4 1/2″ to 13 3/8″ for casing. Special sizes can be produced on request.
Yes. All couplings are 100% thread inspected. Mill test certificates and third-party inspection reports (such as SGS, BV, etc.) can be provided according to project requirements.
Q5:Can EUE and NUE couplings be interchanged?
No. The coupling must match the tubing end connection.
Q6:Can STC and LTC couplings be interchanged?
No. The ordered coupling should match the exact casing thread requirement.
Q7:What is an 8-5/8 in LTC casing coupling?
It is a casing coupling for an 8-5/8 in casing string using an LTC connection. Weight or wall thickness, grade and service condition are also required for a complete order description.
Q8:Can you supply reducing or combination couplings?
Yes, project-specific reducing or combination couplings can be reviewed when the upper and lower size/thread requirements are provided.
Stock List and Quotation
Contact ELITE engineers to obtain the stock list and product pricing.
Email: info@apidrillpipe.com
WhatsApp: +8618615995257
