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Crane lifting an 84-inch bag line stop assembly out of the line

Temporary isolation

Line Stopping 101: Creating a Controlled Work Zone

How temporary stopping equipment, completion fittings, and bypass planning can isolate targeted work without a broad shutdown.

Services 101

Every line needs its own plan.

This overview describes the method. Koppl reviews the line conditions and required work before selecting equipment and procedures.

Discuss your project

Why owners use line stopping

When existing valves cannot isolate a repair or modification, a line stop can create a temporary control point in the active system. It may be used for valve replacement, relocation, tie-ins, leak repair, or emergency work.

The operation in context

A line stop fitting and temporary valve are installed and tested before a hot tap is completed. The tapping machine is replaced by a line stop actuator, which inserts the selected stopping head into the controlled sealing position.

When a bypass enters the plan

Isolation and continuity are separate requirements. If customers or downstream operations must remain supplied, hot tapped bypass connections can move flow around the isolated work zone during modifications.

How the fitting is completed

After downstream work is finished, the stopping head is removed and a completion plug is set in the fitting. Temporary equipment is removed and the installation is closed with a blind flange.

What to send Koppl

Share the pipe size, material, wall thickness if known, operating pressure and temperature, media, line location, access, timing, and the work that needs to happen. Include current photographs and drawings.

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Services 101

Related service overviews.

Start with what you know

Talk to Koppl about your line.

Share the line conditions and work you need completed. Koppl's crew can help identify the next step.