If you are a project owner, EPC contractor or distributor sourcing buried steel pipe, the single most common question we receive is simple: which anti-corrosion pipe should I actually specify? The market is full of options — galvanized pipe, cast-iron pipe, cement-lined pipe, plastic-coated pipe, 3PE, FBE, epoxy-coated — and the choice you make directly determines whether your pipeline lasts ten years or thirty years. This guide walks through the decision process that our sales engineers use every day.

Step 1: Identify the medium and the soil

The first question is not about price, it is about what the pipe will carry and what it will carry it through. Potable water, raw water, sewage, natural gas, compressed air, slurry and chemical wastewater each demand a different internal coating. External corrosion depends on soil resistivity, moisture content, pH, stray current and whether the site is coastal or industrial. A pipe that works perfectly in dry northern soil may fail in five years if buried in a high-water-table coastal area.
For potable water, the internal coating must be approved for drinking-water contact. At Kaiyide, our plastic-coated pipe holds the China National Drinking-Water Safety Sanitation License, covering sizes from DN25 to DN1800. For gas and oil transmission, the external coating is the critical layer — this is where 3PE and FBE come in.

Step 2: Match the coating to the service life target

Buried pipelines are expensive to excavate and replace. Specifying a cheap pipe that corrodes in five years is false economy. The reference below is what we share with buyers:
● Galvanized steel pipe: 5–10 years in normal soil, not suitable for acidic or coastal ground.
● Cast-iron pipe: traditional, but heavy, brittle and increasingly replaced.
● Plastic-coated (EP/PE) steel pipe: 20–30 years, excellent for water, sewer, fire and cable conduit.
● 3PE anti-corrosion pipe: 30–50 years, the standard for oil, gas and long-distance transmission.
● FBE (fusion-bonded epoxy) pipe: good impact resistance, often used as the inner layer of 3PE or for smaller-diameter lines.

Step 3: Check the standards and the test reports

Once you narrow down a product type, the next filter is standards. Do not accept a manufacturer's word — ask for third-party test reports. Our pipe is manufactured under CJ/T 120 for plastic-coated pipe, GB/T 28897 for lined composite pipe, GB/T 5135.20 for fire-rating pipe, GB/T 23257 for 3PE, and German DIN 30670 / 30671. We also hold Type Test approval from the China Special Equipment Inspection and Research Institute for pressure-pipe components.
For every batch we ship, coating thickness, adhesion grade, hydraulic pressure (tested at 5.0 MPa with zero leakage), flattening, drop-impact and fire-retardant properties are documented. We have seen overseas buyers reject Chinese suppliers purely because no test reports were offered. Always ask before you negotiate price.

Step 4: Verify the factory, not just the catalogue
A polished catalogue is easy to fake. What is harder to fake is the factory itself. Before placing a trial order, we recommend three checks:
1.1. Ask for a live video factory tour. We do this daily on WhatsApp — you see the coating line, the testing lab, the finished stock yard in real time.
2.2. Check whether the manufacturer holds ISO 9001, ISO 14001 and ISO 45001 with international marks such as UKAS or IAF. Our triple certification was renewed in April 2026 and is valid through 2029.
3.3. Ask whether the factory supplies national-scale projects. A supplier that has delivered to Xiong'an New Area, municipal gas projects or mining-area water schemes has already been vetted by strict engineers.

Step 5: Start with a trial order
You do not need to commit to a full container on day one. Most of our overseas buyers start with one 20-foot container or even a sample piece, verify the quality against their spec sheet, and then scale up. This protects both sides. We can also offer flexible payment terms, including Alibaba Trade Assurance, so your money is protected until you receive and inspect the goods.

Final checklist before you order
● Define the medium (water, gas, sewage, slurry) and the soil condition.
● Choose the coating system with the service life your project requires.
● Request third-party test reports for coating thickness, adhesion and hydraulic pressure.
● Verify ISO certification with UKAS/IAF marks and the factory's project reference list.
● Start with a trial order under Trade Assurance, then scale once quality is confirmed.
If you send us your diameter, wall thickness, pressure rating and quantity, our engineers will reply within 24 hours with the most cost-effective specification for your project — not the most expensive one we sell.