services
Repair & Maintenance Services
Keeping your heat exchangers and process equipment in peak condition is essential to your production performance.
At GML Trading, we provide fast-response repair, refurbishment, and maintenance services designed to minimise downtime and extend equipment life — without compromising on quality.
Round-the-Clock Support
Our repair teams are available 24/7 to respond to both emergency breakdowns and planned shutdowns. Whether onshore, offshore, or in remote locations, our engineers are equipped to mobilise quickly and carry out work efficiently to get your systems back online.
Specialist Capabilities
We operate from dedicated repair bays capable of handling units up to 100 tonnes and lengths of 25 metres, supported by advanced lifting, extraction, and testing equipment. Our technicians are qualified to work with a full range of materials, including:
Carbon steel
Stainless steel (all grades, including duplex and super duplex)
Aluminium and aluminium bronze
Incoloy, monel, cupro-nickel
Hastelloy and titanium
Our Services Include:
Detube/retube of heat exchangers
Replacement tube bundles and shells
Complete unit replacement
Refurbishments and reconditioning
Diagnosis and consultation services
Hydro-washing for internal tube cleaning
Bolt torqueing and tensioning procedures
Bundle extraction and reinsertion
Long and short-term maintenance contracts
Specialist services
Tube Testing Service
Identifying tube leaks quickly and accurately is essential for preventing costly downtime and maintaining safe, efficient operations.
At GML Trading, we provide a specialist tube testing service designed for rapid leak detection — even in hard-to-access areas — using the latest pneumatic testing technology.
Advanced Testing Technology
We utilise the G-150 pneumatic tube testing gun set, engineered for speed, accuracy, and operator safety.
This system allows our technicians to test tubes without dismantling large sections of equipment, making it ideal for air-cooled heat exchangers and other challenging configurations.
How It Works
The system uses a channel head extension to allow operation outside the water box
Seals are expanded inside the tube, pressurising it for testing
Any drop in pressure — shown clearly on the large gauge — immediately reveals even the smallest leak
Advantages of Our Tube Testing Service
Fast Identification – Quickly isolates leaking tubes in large bundles
Accurate Results – Detects even micro-leaks that can affect performance
Minimal Downtime – Testing can be carried out without major dismantling
Enhanced Safety – Controlled pressure application reduces risk to operators
Cost Savings – Allows targeted repairs rather than full bundle replacements
This service can be carried out as part of routine maintenance, pre-shutdown inspections, or emergency troubleshooting, and is available as a standalone offering or integrated into full repair and refurbishment projects.
Tube Plugging Service
When tube leaks are identified, a safe and reliable sealing solution is essential to restore equipment performance and prevent further damage.
Our Tube Plugging Service uses the CPI Pop-A-Plug® system, an advanced technology that provides a permanent, helium leak-tight seal — without the risks associated with traditional tapered pin methods.
Why CPI Pop-A-Plug®?
Resistant to Thermal Cycling – Maintains a secure seal even under fluctuating temperatures
Helium Leak-Tight – Ensures maximum sealing performance in critical applications
Controlled Force Installation – Protects tubesheet ligaments and prevents damage to adjacent joints
Safe Operation – Eliminates the projectile hazard associated with hammer-driven plugs
Rapid Installation – Each plug can be installed in seconds, reducing downtime
Applications
Air-cooled heat exchangers
Shell-and-tube exchangers
Condensers and process coolers
Any pressurised tubular equipment requiring isolation of damaged tubes
Integrated Testing & Plugging
We can carry out tube testing and plugging in one streamlined service:
Detect leaking tubes using our G-150 pneumatic testing system
Immediately plug defective tubes with CPI Pop-A-Plug® units
Retest to verify a complete seal before equipment is returned to service
This approach minimises plant downtime, reduces repair costs, and ensures long-term equipment reliability.
Customer Care
Customer Care — Before, During & After
At GML Trading, we believe our responsibility to the customer extends far beyond delivering a product or completing a service.
We are committed to supporting our clients before, during, and after every project — ensuring performance, reliability, and value at every stage.
Comprehensive Support
Our modern, fully equipped manufacturing facility — one of the largest of its kind — operates 24/7, allowing us to turn designs into dependable, high-performance products with speed and precision.
Located centrally in the UK, we have quick access to all major transport routes, enabling fast mobilisation for repairs and deliveries.
Specialist Expertise
We work with a vast range of materials — from carbon and stainless steels to exotic alloys such as duplex, incoloy, copper, nickel, aluminium bronze, hastelloy, and titanium.
Specialised welding techniques are carried out in dedicated clean areas to ensure the highest quality finishes and compliance with exact specifications.
Fast Turnaround Repairs
Whether responding to an emergency or supporting a planned maintenance shutdown, we act quickly and effectively to minimise downtime and control costs, keeping your operations running smoothly.
Long-Term Reliability
We offer term contract agreements for regular maintenance, helping clients plan shutdowns efficiently while benefiting from reduced costs and guaranteed service priority.
Custom Solutions
Custom design of vacuum and condenser equipment for steam turbine exhaust systems
Shell-and-tube heat exchangers designed and built to exact client specifications
Refurbishment and spares supply for complete peace of mind during planned or emergency works
Helix Exchanger technology offering reduced fouling, improved heat transfer, and lower lifetime operating costs
Our promise: No matter the size or complexity of the job, GML Trading stands alongside you at every stage — ensuring you receive not just a product or service, but a partnership built on trust, expertise, and lasting value.
If you want, I can now position this Customer Care section directly after your Repair & Maintenance, Tube Testing, and Tube Plugging content so the Services page flows from technical capability → specific services → ongoing client support.