Import 5-1/2 Ltc Pup Joint — Buy in wholesale FOB from Supplier in China

The 5-1/2 LTC pup joint from Tianjin Dalipu Oil Country Tubular Goods Co., Ltd is a short-length tubular accessory with Long Threaded Connection (LTC) ends on both sides, manufactured to API 5CT specification for adjusting spacing in casing strings during oil and gas well construction. The nominal 5-1/2 inch outside diameter corresponds to 139.7 mm, with the LTC thread form providing eight round threads per inch for reliable pressure sealing in moderate-depth applications. Material specification covers API 5CT carbon steel grades J55 or L80, with the specific grade selection determining yield strength, tensile properties, and suitability for sour service conditions. Wall thickness and inside diameter vary by weight designation, which buyers must confirm with the supplier to match existing casing string specifications.

The J55 grade offers a minimum yield strength of 55 ksi (379 MPa) with controlled hardness for general service, while L80 provides 80 ksi (552 MPa) minimum yield with restricted hardness for higher pressure or more corrosive environments. Heat treatment protocols differ between grades, with L80 requiring quenching and tempering to achieve specified mechanical properties and HRC hardness limits. Thread inspection includes API ring and plug gauge verification, with thread compound application critical to galling prevention and seal pressure achievement. The short length of a pup joint, typically 0.61 to 1.52 metres depending on specification, allows precise adjustment of casing shoe depth or hanger placement without standard joint length constraints.

Primary applications include casing string spacing correction, landing nipple positioning, and temporary barrier installation during drilling and completion operations in onshore and offshore oilfield developments. Buyers range from national oil companies and independent operators to drilling contractors and OCTG distributors serving secondary workover markets. The API 5CT certification ensures interchangeability with casing from other licensed manufacturers, though traceability documentation and mill test certificates remain essential for project quality records. Tianjin Dalipu's location in Jinghai District positions the facility within China's northern steel and pipe manufacturing corridor, with Tianjin Port providing export logistics infrastructure.

Tianjin Dalipu Oil Country Tubular Goods Co., Ltd operates from Jinghai District in Tianjin Municipality, 301600, placing the facility within one of China's principal clusters for oilfield tubular manufacturing and steel processing. The supplier's trust tier registers as harbor, indicating baseline marketplace standing without premium verification enhancement. The response rate of 0.00 percent and zero recorded average response hours suggest limited recent buyer interaction through the platform channel, though this does not necessarily reflect general commercial responsiveness through direct sales channels. The company name explicitly identifies oil country tubular goods as its specialisation, indicating focused competence rather than general steel trading diversification.

The listing positions Tianjin Dalipu as a manufacturer of API 5CT certified pup joints for drilling and production applications, with the 5-1/2 inch LTC variant representing a standard OCTG catalog item. No employee count, annual revenue, year of establishment, named client list, or specific production capacity figures appear in the source material. The Jinghai location offers proximity to Tianjin Port for seaborne export, with the Beijing-Tianjin-Hebei industrial base providing raw material and machining support. Buyers should verify current API monogram licence status, quality management system certification, and recent mill test certificate examples before committing to specification or volume orders, as these foundational credentials determine fitness for oilfield service.