On September 24th, amidst the sea breeze at the Dalian Shipyard, the whistle of the “Haiyun” vessel pierced a new record for domestically produced large-scale LNG carriers. This is the first 175,000 cubic meter LNG carrier built by China Shipbuilding Industry Corporation (CSSC) Dalian Shipyard for China Shipbuilding Trading and China Merchants Energy Shipping. It is another gilded business card presented by a Chinese shipbuilder to the “Crown Jewel of the Shipbuilding Industry.”

While the internet cheers for “Made in China” gaining a dominant voice in LNG shipping, we, standing among the domestic brands in the field of marine cable and pipe transit sealing technology, share the same excitement as all shipbuilders. The safe departure of the “Haiyun” vessel signals a collective breakthrough for China’s high-end ship supply chain. And TST SEAL is poised to be the “sealing companion” for China’s shipbuilding industry on its next “deep-sea journey.”

01
The “Invisible Lifeline” of High-End Vessels:
Piercing Seals, Never a “Supporting Role”

In LNG carriers, “mobile ice storage facilities” at sea, cable and pipe penetration seals are the lifeblood of the entire vessel—protecting every barrier between -163°C liquefied natural gas and the high-temperature engine room, and between flammable gases and living quarters.

Hull Structure: Cable and pipe penetration seals act as “buffer locks” in stress-bearing areas of the hull, resisting mechanical stress concentrations and preventing LNG leaks caused by deck cracking, seawater backflow, or low-temperature embrittlement.

Hazardous Areas (Topside/Electrical Room): Sealing systems act as “airtight explosion-proof walls” in explosion-prone areas, preventing BOG gas penetration and explosion barrier failure, ensuring absolute safety in flammable environments.

Life Support Systems: Sealing systems act as “pollution barriers” for vital resources, preventing blackwater backflow and corrosive gas intrusion, eliminating drinking water contamination and the risk of suffocation. Power facility modules: The sealing system serves as the “electromagnetic shield” of the power supply’s lifeline, protecting against external electromagnetic interference and seawater infiltration, maintaining stable operation of the control system and distribution cabinets.

These “inconspicuous holes” are actually the last physical barrier to the 170,000 cubic meters of flammable liquid natural gas on LNG ships—a failure in one can jeopardize the entire system.

In the past, this type of “bottleneck” sealing technology forced Chinese shipbuilders to rely on European and American manufacturers for a long time. Now, when Chinese shipbuilders can build the “crown jewel,” the accompanying sealing systems should also have a “Chinese answer.”

02
TST SEAL’s Confidence:
A Chinese brand can also offer a “global passport”

As a Chinese brand specializing in cable and pipe penetration seals, TST SEAL has honed its strength through meticulous craftsmanship and a spirit of innovation and research to achieve the “hard power to handle high-end tasks,” bolstering the confidence of Chinese companies in maritime vessel penetration seal technology:

01
Certifications by Five Global Classification Societies

Thanks to its superior technical expertise and rigorous quality control, TST SEAL has successfully achieved certifications from CCS (China Classification Society), RS (Russian Maritime Register of Shipping), ABS (American Bureau of Shipping), BV (Bureau Veritas), and RINA (Registra Italiana), becoming one of the few Chinese companies to achieve certifications from all five of the world’s leading classification societies. This demonstrates TST SEAL’s core competitiveness in aligning with international standards in the marine sector and serving the global market. 02
Safeguarding Extreme Environments
The TST SEAL cable and pipe transit sealing system provides four key protections for ensuring vessel safety:
1. Dual Watertight and Airtight Protection: The EPDM sealing module and 316L stainless steel frame achieve IP68 waterproofness and 0.5 MPa airtightness, completely blocking the intrusion of seawater, salt spray, and oil and gas.
2. Dual Fire and Explosion Protection: Equipped with A-0 to A-60 fire-resistant modules (compliant with FTP regulations), they block the spread of flames and high-temperature smoke. The modules also meet explosion-proof certification (Ex d IIC Gb/Gc), making them suitable for high-risk areas such as engine rooms and cargo holds.
3. Vibration-Resistant and Stable Seal: The modules withstand 20g continuous vibration, and the frame is welded to the bulkhead to prevent shifting or loosening of cables.
4. Weather-Resistant and Long-Lasting: The 316L stainless steel withstands 1000 hours of salt spray without rusting, while the EPDM is temperature-resistant from -50°C to 120°C and resistant to aging. With a design life of 30 years, this significantly reduces vessel operation and maintenance costs. 03
Full-Scenario Coverage, Solving Real Problems
From membrane cargo tank sealing for LNG carriers, to main engine penetration sealing for ultra-large container ships, to offshore booster platform sealing for offshore wind turbine booster stations, we have provided comprehensive cable and pipe penetration sealing solutions for many leading domestic shipowners, shipyards, EPCs, and new energy (offshore) companies.

03
The Future of TST SEAL:
Becoming the “Supply Chain Root” of China’s Shipbuilding Industry

Why Choose TST SEAL?

Because we understand the “economy” of China’s shipbuilding industry: To achieve greater cost reduction and efficiency, we support manual cutting and installation without expensive custom cuts, and allow for later modular expansion without the need for wall demolition and hole breaking, shortening construction time by 30% and reducing operation and maintenance costs by 40%.
Because we understand the “reality” of China’s shipbuilding industry: To provide more attentive support, our technical team is deeply involved in the entire project design process, from diagnosing sealing pain points in special operating conditions to ensuring dual-redundancy solutions for offshore converter stations, making our service a “second technical department” for designers. Furthermore, we understand responsibility: localization isn’t about substitution; it’s about providing an extra layer of safety for China’s shipbuilding industry.
When we saw Dalian Shipyard achieve zero leakage on its first LNG carrier, we understood that only by deeply cultivating its foundation and striving for excellence can TST SEAL truly become a solid force driving the industry forward.

04
To the Chinese Shipbuilding Industry:
Together, Let’s Sail into a Deeper Blue

The whistle of the “Haiyun” vessel cuts through the deep blue, carrying not only LNG to ports around the world but also the resounding confidence of China’s shipbuilding industry as it breaks into the high-end market—a milestone for China’s intelligent manufacturing.

TST SEAL’s MCT transit sealing system offers a powerful technological answer: We are committed to being the “innermost reliable, invisible and secure” cornerstone of China’s shipbuilding globalization journey. From cargo hold piping to cabin gaps, we use precision sealing to build a solid safety line, bringing an added level of confidence to every voyage. In the future, we look forward to seeing TST SEAL’s protective pulse beat within the “Chinese heart” of more ultra-large LNG carriers, smart container ships, and offshore wind power equipment.

As China’s shipbuilding industry forges deeper into the blue—TST SEAL resonates with you and embarks on this new journey together.