Jiangyin, Jiangsu, China – September 16, 2026
Galvanized round steel pipes are fundamental components in industrial and domestic infrastructure. Ensuring leak-free assemblies and long-term durability in domestic water supply systems requires strict adherence to standardized joining protocols and improper storage prevention. This technical guide outlines the complete procedural standards for connecting and storing Galvanized Steel Pipes.
1. Technical Scope and Specifications for Threaded Connections
For domestic water supply pipelines, threaded connections (also known as screw-threaded joints) are the standard mechanical joining method. To ensure structural safety under working pressure, specific engineering parameters must be maintained:
Applicable Nominal Diameter (DN): Suitable for pipelines with nominal diameter $le 100text{ mm}$.
Applicable Nominal Pressure (PN): Designed for systems operating at nominal pressure $le 1text{ MPa}$.
Thread Geometry Specifications: Features a thread form angle of $55^circ$, a taper ratio of $1:16$, and a taper angle of $1^circ 47′ 24”$.
Machining Options: Pipe threads can be cut on-site using a portable pipe threader or machined in a workshop on a lathe.
The accuracy of the working thread length (the distance from the pipe end to the reference plane) is critical. The reference plane is a designated cross-section where the major diameter, pitch diameter, and minor diameter of the tapered pipe thread precisely equal those of a parallel pipe thread of the equivalent nominal size.
2. Pipe Thread Categories and Mating Formations
Pipe threads fall into two main categories: conical (tapered) and cylindrical (parallel). Tapered pipe threads are typically created through manual on-site threading.
When installing threaded pipe joints, three principal mating forms are used:
Parallel Female Thread to Parallel Male Thread
Parallel Female Thread to Tapered Male Thread
Tapered Female Thread to Tapered Male Thread
In engineering practice, parallel-to-taper and taper-to-taper combinations are widely adopted because their progressive wedge contact delivers superior fluid sealing performance under operational stresses.
3. Step-by-Step Threaded Assembly Procedure
Achieving a durable joint requires proper application of traditional sealing compounds, which act as both a sealant and a anti-corrosion barrier.
Step 1: Thread Inspection and Cleaning
Inspect the cut threads for compliance with working length requirements and clean off any metal shavings or lubricant residues.
Step 2: Sealant Filler Application
Wrap a thin, even layer of oakum along the thread helix on the completed male threads. Next, coat red-lead thick paint directly over the oakum layer before screwing the joint together.
Step 3: Mechanical Tightening
Screw the pipe fitting onto the pipe. Installation personnel must carefully monitor the process to prevent sealing filler from being squeezed into the pipeline interior, which would cause operational flow blockages.
Step 4: Joint Finishing
After fully tightening the connection, wipe away and remove any excess oakum and red-lead thick paint squeezed out at the interface to maintain a neat and compliant installation.
Note: Oakum combined with red-lead thick paint serves a dual purpose—it ensures a reliable fluid seal and protects machined pipe threads against rust and ambient corrosion.
4. Key Storage Protocol for Galvanized Steel Pipes
When galvanized steel pipes are held in stock post-production rather than used immediately, proper storage protocols are vital to protect product integrity:
Protect Against Physical Damage: Clear all hard debris and rocks from the storage area floor. Scratches or dents can disrupt the zinc coating and compromise base-metal protection.
Ensure Dry and Ventilated Conditions:Always store Galvanized Pipes in well-ventilated, dry environments. Damp conditions accelerate zinc oxidation and causewhite rust, which rapidly degrades the underlying steel and reduces service life.
About Us
Hunan Tubular steel works as Sanhe heavy industry Co., Ltd. export window in the world market started from 2012. For many years, we are committed to providing reliable and valuable solutions for projects and operations to our clients and partners around the world.
Media Contact
Company Name: Hunan Tubular Steel Industry Co., ltd.
Contact Person: Media Relations
Email: Send Email
Country: China
Website: https://www.tubularpiles.com/