Hot Tapping
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.
Pipe Freezing
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.
Line Stop
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.
Leak Repair
We offer a range of proven maintenance and repair products that are unique in pipeline services. These products eliminate or minimize the cost of plants and equipment downtime.
Valve Insertion
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.





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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
Email:enquiry@alstern-technologies.com.hk