Linestopping can be performed on many types of piping materials and for a variety of media such as gas, water, sewage and oil.
Why use linestopping?
- Service to consumers process industries and sensitive services is maintained.
- Contamination and / or loss of fluid or gas does not occur.
- Toxic or harmful product is not released.
- Fire protection not affected.
- No time wasted draining the systems.
- Personnel are used efficiently on effecting repair.
- Eliminates need for bulk transfer and storage of harmful fluids.
Consider this against the cost of a shut down:-
- Planning and co-ordination of shut down – meetings, schedules, paperwork.
- Notification of consumers or process plant personnel.
- Compensation to customers, loss of goodwill.
- Lost production and therefore profit in process industry.
- Direct labour cost – locate and activate valves.
- Overtime rates for working at "low demand times" normally nights and weekends.
- Drainage, purging and refilling of pipelines.
- Disruption to road work systems by road closures.
By utilising Powers under-pressure techniques work can be performed allowing alteration, relocation, extension, addition, repair, replacement, maintenance, or abandonment of pipework without shutdown or interruption of service to critical processes or consumers.
A 48” five position linestop operation, in the background the 36” five position has already been completed, the 36” steel main has been cut and capped to allow the new 48” spiral steel pipe to come through and tie into the existing 48” spiral steel pipe. The bypass runs on both ends and the distance between the stops was approximately 3 miles, the picture shows the 96100 tapping machine mounted and drilling.
Example of a linestop operation:
The 42" linestop fitting placed onto the 42" steel main, this fitting has to be welded fully onto the steel main, pressure in the pipeline 10 bar. Pressure tested to 20 bar.
The 42" Linestop Valve, mounted into position onto the 42" steel main. Note the valve is hydraulically operated and the steel pipe has been surrounded with concrete to accept the weight of the linestop equipment, approximate weight of the equipment eleven tonnes.
The 42" Linestop Tee, the 42" Linestop Valve and the 3680 Tapping Machine rigged 42" to complete the 42" linestop drilling. Drilling time 2hr 20 mins.
Current capabilities are from 1/2" through to 60" diameter. Larger sizes can be designed and manufactured if required.