Grade R4-R4S Studless Offshore Mooring Chain

The Grade R4-R4S studless offshore mooring chain, manufactured by CSAC Chain (Zhoushan Zhongnan Anchor Chain), is specifically engineered for the rigorous environments of deep and ultra-deep waters. Boasting exceptional tensile strength and superior shock-absorbing capabilities, this product serves as a critical connecting component for ensuring the stable positioning of FPSOs, semi-submersible drilling platforms, and various other offshore engineering facilities. Backed by over 30 years of R&D expertise, the product strictly adheres to international maritime standards, providing rock-solid safety assurance for global offshore oil and gas development—even under extreme marine conditions characterized by severe winds, heavy seas, and high corrosion.

Product Overview

As a high-grade offshore mooring product, the Grade R4-R4S Studless Offshore Mooring Chain serves as a critical connection between surface facilities and the seabed. Its core functions include anchoring marine assets (such as vessels and floating platforms) to maintain stable station-keeping at designated water depths, as well as transmitting and dampening external impacts from wind, waves, and currents.

Design Features & Application Scope

Exclusively engineered for deepwater and ultra-deepwater applications, this product from CSAC Chain is widely adopted in various marine development facilities, including Floating Production, Storage, and Offloading (FPSO) vessels, semi-submersible drilling rigs, and offshore platforms. Built to withstand severe marine conditions with strong currents and adverse weather, it provides reliable mooring support for offshore oil and gas extraction, marine engineering construction, and related sectors.

Company Profile

Basic Information & Geographical Advantage

Zhoushan Zhongnan Anchor Chain Co., Ltd. (CSAC Chain) was founded in 1986 and is located in Zhoushan City, China’s first national-level archipelago new area. The company benefits from a strategic location, close to Mount Putuo and near Ningbo-Zhoushan Port, providing convenient transportation and logistics support.

Development & Brand Strength

Covering an area of 18,000 square meters, the company has developed into a professional manufacturer of marine anchor chains and offshore mooring chains in China. With over 30 years of experience, CSAC Chain focuses on the R&D and production of Grade R4-R4S Studless Offshore Mooring Chains, following international standards and industry requirements to ensure consistent product performance and reliability.

Application Fields

Main Application Scenarios

The Grade R4-R4S Studless Offshore Mooring Chain (CSAC Chain) is mainly used in deepwater and ultra-deepwater mooring systems, including the following scenarios:

• FPSO Vessels: Used to secure floating production and storage units, helping maintain stable positioning under offshore environmental forces.
• Semi-submersible Drilling Platforms: Provides stable mooring support for deepwater drilling operations and enhances platform safety.
• Offshore Platforms: Suitable for oil and gas platforms, offshore wind structures, and other marine installations requiring long-term station-keeping.
• Other Marine Equipment: Compatible with SPM systems, pipe-laying vessels, dredgers, and other offshore engineering equipment.

Product Parameters

Quality Certification

The Grade R4-R4S Studless Offshore Mooring Chain (CSAC Chain) has obtained numerous international and domestic certifications, strictly adhering to relevant standards. These include:

Chinese National Standard: GB/T 32969-2016

International Association of Classification Societies (IACS) Standard: IACS UR W22

China Classification Society (CCS) Certification

All certifications are authentic and valid; relevant documentation is available for client verification, ensuring that the product fully complies with industry regulations and client requirements.