 About Us Tianjin Dalipu Oil Country Tubular Goods Co., Ltd is currently an emerging production and marketing enterprise based production Casing and Tubing. Main products： ①Tubing（1.9"-4-1/2"）；②Casing（4-1/2"-20"）③Pup Joint ④Coupling ⑤Crossover ⑥Thread processing Material:J55/K55/N80-1/N80Q/L80/P110/C90/T95/Q125/80S/80SS/90S/90SS/L80-3Cr/L80-9Cr/L80-13Cr Thread Type:EUE,NUE,LTC,STC,BTC,IF,REG,High gas seal processing. |
 Introduction Long Thread Connection Couplings are short lengths of pipe used to connect 2 joints of casing.They come with painted colour codes on their external surface to indicate their grades.Couplings are manufactured according to API 5CT and 5B specifications. |
Size | 4-1/2”~20” |
Material Grade | J55\K55\N80\L80\P110\Q125\L80-3Cr\L80-9Cr\L80-13Cr |
Thread Type | STC\LTC\BTC\Premium Connection |
Size | Outside Diameter(mm) | Weight(kg) | |
STC | LTC | ||
4-1/2” | 127.00 | 3.62 | 4.15 |
5” | 141.30 | 4.66 | 5.75 |
5-1/2” | 153.67 | 5.23 | 6.42 |
6-5/8” | 187.71 | 9.12 | 11.34 |
7” | 194.46 | 8.39 | 10.83 |
7-5/8” | 215.90 | 12.30 | 15.63 |
8-5/8” | 244.48 | 16.23 | 21.67 |
9-5/8” | 269.88 | 18.03 | 25.45 |
10-3/4” | 298.45 | 20.78 | - |
11-3/4” | 323.85 | 22.64 | - |
13-3/8” | 365.12 | 25.66 | - |
16” | 431.80 | 34.91 | - |
18-5/8” | 508.00 | 54.01 | - |
20” | 533.40 | 43.42 | 57.04 |
 N80 Coupling |  L80 Coupling |  J55/K55 Coupling |
 L80-13Cr |  L80-13Cr |  L80-13Cr |
 K55 Special Clearance |  L80 Special Clearance |  J55 Special Clearance |
 Main Feature1.High Precision in Size and shape 2.Good corrosion resistance 3.High collapse strength 4.Excellent comprehensive mechanical properties 5.High connection strength and salability 6.Constant mechanical properties at high temperature |
 Advantage 1.Full-set quality control 2.Strict quality inspection 3.Tight Tolerances 4.Technology Support 5.As international standard 6.Good quality and prompt delivery |
 Processing flow chart |  Testing equipment ①Raw Material Inspectioon Device:Ultrasonic Detector;②Hydraulic Tester:PPT-80; ③Ultrasonic Pachometer:HCH-2000C ④Magnetic Detector:EMW-4000;⑤Coating Pachometer:TT-26 |
 Processing Lathe |  Processing Thread |  Pneumatic Marking Machine |
| Packade | In Fumigation-free wooden cases,Wooden pallet packaging |
| Delivery | Within 15-75 days(Based on actual quantity) |
| Shippment | By sea,By air |
 Carton packaging |  Steel strapping |  Wooden Pallet Package |
Q: How many days of your delivery?
A: According to your quantity.
Q: What is your main payment itme?
A: 30% down payment,70% paid before delivery.
Q: Surface coating?
A: Anti-rusted painting, varnish painting, galvanized, and as per customers' request.
Q: Packing?
A: In bundles or in loose, plastic pipe cap or pipe end protector, or as per customers' request.
Q: Shipment terms?
A: Container vessel, bulk cargo ship, train, land transportation.
We would like to establish long term business with any reliable partner in the world . Any interesting or questions, pls don't hesitate to contace us . Waiting for your kindly reply . Thanks
