φ57 Welded Type Sonic Logging Pipe (57mm Sleeve Welded CSL Pipe)

The φ57 (57mm OD) Welded Type CSL Pipe is a heavy-duty, large-diameter solution designed for deep foundation piles, super-high-depth pilings, and critical infrastructure projects (such as marine bridges, high-speed railway piers, and high-rise structures). This 57mm configuration utilizes a thick-walled steel sleeve coupling and permanent on-site welding to deliver maximum bending and torsional resistance, keeping the acoustic testing channel perfectly straight under severe rebar cage stresses.

φ50 welded type sonic logging pipe (50mm sleeve welded csl pipe)

Key Features & Advantages

Unmatched Joint Rigidity: The heavy steel sleeve joint offers superior structural strength, maintaining the verticality of the CSL channel during deep borehole lowering.

100% Slurry-Proof Barrier: Continuous on-site fillet welding creates an absolute steel-to-steel fusion seal, eliminating any risk of slurry ingress under extreme hydrostatic pressures.

Spacious Probe Clearance: The 57mm outer diameter comfortably accommodates standard, heavy-duty, or dual ultrasonic testing probes, preventing blockages.

High Cost-Efficiency: Despite its heavy structural strength, the sleeve weld-on design remains highly cost-effective for large-volume procurement compared to mechanical fittings.

Technical Specifications

The φ57 sleeve welded sonic logging pipe is manufactured to heavy-duty engineering tolerances:

Parameter	Specification Details
Outer Diameter (OD)	57 mm
Wall Thickness (WT)	1.0 mm to 3.5 mm
Material Grade	High-Quality Carbon Steel (Q235 / Q345 / ASTM A53)
Connection Method	Sleeve Overlap + Fillet Welding
Sleeve Length	80 mm to 150 mm (Customizable)
Surface Treatment	Bare (uncoated) / Black Varnished

Quality Control & Structural Compliance

CNC Controlled Sleeve Tolerances

We utilize advanced CNC machinery to expand the sleeve couplings, ensuring precise socket matching. This snug fit ensures structural stability across the entire pipe string and simplifies on-site welding.

Burr-Free End Finish

Both ends of the φ57 pipes are thoroughly smoothed and deburred. This prevents internal weld melt-through and ensures a smooth internal path for heavy-duty geotechnical testing probes.

Installation Instructions

Slide: Slide the enlarged φ57 sleeve coupling onto the plain end of the first pipe.

Align: Insert the plain end of the second φ57 pipe into the other end of the sleeve until they meet in the middle.

Weld: Execute a full-circle fillet weld at both ends of the sleeve coupling to ensure a watertight, high-strength permanent seal.

Frequently Asked Questions (FAQ)

Q: Why is φ57 Welded pipe preferred for marine piling and bridge foundations?

A: Marine piling and bridge foundations involve extreme pile depths and massive rebar cages. The φ57 Welded pipe is preferred because it delivers identical structural strength and seamless bending resistance as the parent pipe body. It eliminates any reliance on rubber seals or mechanical threads, providing maximum structural reliability under extreme geological loads.

Q: What end prep options do you offer for φ57 welded CSL pipes?

A: We offer Enlarged Socket Sleeves (bell ends) pre-welded to the pipe end, as well as Beveled Ends. The pre-welded socket-sleeve option allows the next pipe to slide easily into the pre-expanded end, maintaining axial alignment and creating a natural lap joint that welders can fuse quickly.

Q: What steel grades do you use to ensure weldability of the φ57 pipe?

A: We utilize premium carbon steel (such as Q235B, ASTM A53, or EN 10219 S235) with a low carbon equivalent (CEV). This chemistry ensures outstanding weldability under standard field conditions, minimizing the risk of weld cracking or embrittlement during rapid on-site cooling. All properties are traceable via our EN 10204 3.1 MTC.

Q: Does the high heat of welding cause internal slag that could block the φ57 CSL probe?

A: No, when standard welding practices are followed. For our socket-welded (sleeve) configurations, the fillet weld is executed entirely on the outside lip of the expanded sleeve. The inner channel remains perfectly smooth and uncompromised by heat or slag, guaranteeing an unobstructed path for the CSL ultrasonic probes.

Q: Do you provide heavy-duty bottom caps and temporary top plugs for φ57 welded systems?

A: Yes. We provide heavy-duty, pre-welded watertight steel bottom plates to completely seal the base of the first tube string. For the top of the tubes, we supply temporary, tightly fitting plastic or steel caps to prevent concrete splashes, mud, or rainwater from introducing debris into the testing channel.