Views: 1 Author: Site Editor Publish Time: 2025-02-20 Origin: Site
In January 2025, our company received an inquiry from a customer in Singapore for a batch of carbon steel pipes. The material is relatively common, and the product is our company's main product. The customer particularly emphasized that the port should be sprayed with yellow paint as a sign of seamless identification.
ZIZI is a company specializing in the production and processing of pipes and fittings. The pipes and pipe fittings we produce are mainly used in chemical, petroleum, natural gas, water conservancy, electric power, marine engineering and other fields. The products mainly include seamless pipes, welded pipes, butt-welded pipe fittings, high-pressure forged pipe fittings and flanges of various sizes. The materials include carbon steel, stainless steel, alloy steel, low-temperature steel, duplex steel, base alloy, etc.
ITEM | DESCRIPTION | Quantity | Unit |
1 | API 5L GR B PSL 2 SEAMLESS PIPE 12M LONG DN200 STD WITHOUT ANY PAINTING | 2208 | M |
✅ 1. Visual Inspection
Check for surface defects: cracks, laps, seams, scale, gouges, or scoring
Ends must be beveled or plain as per order
Pipe straightness and ovality are checked
✅ 2. Dimensional Inspection
OD (Outer Diameter), WT (Wall Thickness), and Length as per order and tolerances
Measured using calipers, ultrasonic gauges, etc.
Ovality and eccentricity are checked especially for large diameter pipes
API 5L Grade B PSL 2 seamless pipe is a specific type of steel pipe that adheres to the American Petroleum Institute (API) Specification 5L. Here's a breakdown of what that means:
API 5L: This is an API specification that outlines the requirements for steel pipe used in pipeline transportation systems for the petroleum and natural gas industries. It covers seamless and welded steel line pipe.
Grade B: This refers to a specific grade of steel within the API 5L specification. Grade B indicates a certain minimum yield strength and tensile strength. It's a very common and widely used grade for standard pipeline applications.
PSL 2 : API 5L defines two product specification levels: PSL 1 and PSL 2. PSL 2 has more stringent requirements than PSL 1 regarding chemical composition, mechanical properties, and testing.
Pipes manufactured to PSL 2 standards generally have:
Stricter chemical composition limits: This ensures higher quality and consistency of the steel.
Higher mechanical properties: Typically includes higher yield strength, tensile strength, and impact toughness requirements.
More rigorous testing requirements: This can include non-destructive testing (NDT) like ultrasonic testing, and more detailed inspection procedures.
Specific manufacturing practices: PSL 2 often requires the steel to be killed (fully deoxidized) and produced using fine grain practices.
PSL 2 | ||||||||||||
GRADE | Chemical Composition | Mechanical Property | ||||||||||
C | Mn | P | S | Tensile | Yield | C. E. IMPACT ENERGY | ||||||
(Max) | (Max) | (Max) | (Max) | Psi x 1000 | Mpa | Psi x 1000 | Mpa | PCM | IIW | J | FT/LB | |
B | 0.24 | 1.2 | 0.025 | 0.015 | 60 - 110 | 414 - 758 | 35 - 65 | 241 - 448 | 0.25 | 0.43 | T/L 27/41 | T/L 20/30 |
API 5L Grade B seamless pipe is a general purpose carbon steel pipe used in different industries. Its diameter ranges from 1/8” to 48”, and wall thickness ranges are SCH 10, SCH 20, SCH 40, STD, XS, SCH 100, SCH 120, SCH 160, XXS.
Grade B Carbon Steel Pipe Thickness Schedule
DN | NPS | OD | SCH20 | SCH30 | STD | SCH40 | SCH60 | XS | 80 |
6 | 1/8 | 10.3 | - | 1.45 | 1.73 | 1.73 | - | 2.41 | 2.41 |
8 | 1/4 | 13.7 | - | 1.85 | 2.24 | 2.24 | - | 3.02 | 3.02 |
10 | 3/8 | 17.1 | - | 1.85 | 2.31 | 2.31 | - | 3.20 | 3.20 |
15 | 1/2 | 21.3 | - | 2.41 | 2.77 | 2.77 | - | 3.73 | 3.73 |
20 | 3/4 | 26.7 | - | 2.41 | 2.87 | 2.87 | - | 3.91 | 3.91 |
25 | 1 | 33.4 | - | 2.90 | 3.38 | 3.38 | - | 4.55 | 4.55 |
32 | 11/4 | 42.2 | - | 2.97 | 3.56 | 3.56 | - | 4.85 | 4.85 |
40 | 11/2 | 48.3 | - | 3.18 | 3.68 | 3.68 | - | 5.08 | 5.08 |
50 | 2 | 60.3 | - | 3.18 | 3.91 | 3.91 | - | 5.54 | 5.54 |
65 | 21/2 | 73.0 | - | 4.78 | 5.16 | 5.16 | - | 7.01 | 7.01 |
80 | 3 | 88.9 | - | 4.78 | 5.49 | 5.49 | - | 7.62 | 7.62 |
90 | 31/2 | 101.6 | - | 4.78 | 5.74 | 5.74 | - | 8.08 | 8.08 |
100 | 4 | 114.3 | - | 4.78 | 6.02 | 6.02 | - | 8.56 | 8.56 |
API 5L Grade B ERW Pipe Tolerance
OD Tolerance | WT Tolerance | ||||
A, B | X42 ~ X70 | ||||
D<60.3milimeter | +0.41/-0.40milimeter | D<73milimeter | +20%/-12.5% | D<73milimeter | +15%/-12.5% |
D>=60.3milimeter | +0.75/-0.40milimeter | D>=73milimeter | +15%/-12.5% | D>=73milimeter | +15%/-12.5% |
Category | PSL1 (Product Specification Level 1) | PSL2 (Product Specification Level 2) |
Purpose | Standard quality for general applications | Higher-quality pipe for critical applications |
Chemical Composition | Basic limits on elements | Stricter limits on elements like Carbon (C), Sulfur (S), and Phosphorus (P) |
Mechanical Properties | Yield and tensile strength requirements only | Yield, tensile plus elongation and toughness |
Charpy Impact Test | Not required | Required (especially for low-temp or sour service) |
Non-Destructive Testing | Not mandatory | Mandatory UT or EMI for seamless and welded pipes |
Traceability | Heat number marking | Full traceability to heat and test data |
Repair by Welding | Allowed | Not allowed |
Certification | EN 10204 3.1 (Mill Test Certificate) | 3.1 or 3.2 (with third-party inspection if requested) |
Intended Use | Low to medium-risk applications | High-risk environments: offshore, sour service, etc. |
Crude oil and natural gas pipelines
Gas transmission and distribution
Water injection lines
Offshore platform piping
Structural supports and pilings
