Alstern Technologies is a specialized engineering company providing specialized pipeline services. Our capabilities in specialized pipeline services include:
Hot tapping is a method of employing an under pressure drilling machine to cut a hole in an operating pipeline or storage vessel which allows for a new branch connection from the existing pipe or vessel without any interruption to the flow.
Hot Tapping
Line stop is a method that temporarily stops the pipe flow in a section of the pipe so as to allow for alteration and addition works to be carried out at the downstream of the pipeline; without stopping or purging the system.
Line Stopping / By-Pass
Alstern’s ATS Valve Insertion Service uses advanced technique to insert valve directly onto main pipeline at minimum manpower and tight spaces without system interruption or shutdown. The result is a permanent valve installed on the pipe section.
Thermal Insulation
​Pipe freezing is method to freeze the content of a section of pipe by applying cryogenic (i.e. very low temperature) freezing agent in a controlled manner. when the ice plugs are formed maturely, maintenance works to the pipe can be carried out between the ice plug without draining massive amount of pipe fluid.
Pipe Freezing
At Alstern Technologies, we have a team of professional and well-trained specialists to provide leak detection service on underground gas and water pipelines, concealed pipeline, air ducts and storage (pressure or vacuum) vessels.
Leak Detection
Leak Sealing is an online leak repair service performed on operating pipelines, without shutting down the operation, so that the system can continue to operate avoiding expensive shutdown or losses.
Leak Sealing
While leaks are threatening to life, properties and the environment, they are expensive as well. At Alstern Technologies, we offer a broad range of leak repair service. We have a team of Emergency Response Team with qualified and well-trained leak repair specialists who are always ready to meet your leak repair needs.
Leak Repair
​Corrosion is threatening to life, properties and the environment. This is especially vital for Corrosion Under Insulation (CUI) where the state of corrosion goes undetected. Pipe failures often occur without prior notice resulting in significant down time and huge losses. Throughput is usually affected when operating conditions such as pressure and temperature must be adjusted to the pipe condition.
Pipeline Reinforcement / Corrosion Repair
Alstern Technologies offers a complete service that includes: FoamSMART thermal insulation, sheet metal fabrication and fire protection cladding. These services cover installation, fabrication, project management and supply contracts.
Thermal Insulation


We provide Environmental Monitoring (ENV) and Non-Destructive Testing (NDT) services and verification reports as an independent service provider:
Alstern Technologies provides analytical support to owners, consultants and industrial site managers in site assessments, remedial investigations, and implementation of remedial measures. We employ the latest procedures to assess air, ground water, waste and industrial hygiene for contaminants.
Environmental Monitoring
Alstern Technologies provides full inspection non-destructive testing services including corrosion monitoring, magnetic particle test, tank floor scanning, infrared thermography, ultrasonic tests, etc We provide Ultrasonic Test, Holiday Inspection, Remote Visual Inspection
Non-Destructive Testing


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Hong Kong Office

Alstern Technologies (HK) Ltd.
Address:Unit 2, 26/F, Global Gateway Tower,
63 Wing Hong Street, Cheung Sha Wan, Kowloon, H.K.
Tel:+852 2647 8163
Fax:+852 2647 4163