Microsoft Word - SOP - Hands-On Sessions

Rev. 2 - Final

PART B:

START UP AFTER LINE BREAK

STEP NUMBER

SAFETY AND HEALTH HAZARDS/ STEPS TO AVOID DEVIATION

DESCRIPTION

1

Close the service valve and reinstall the plug.

2

Evacuate piping or equipment thoroughly with vacuum pump.

Air left in the system will add to head pressure causing an increase in head pressure and possible lifting of relief valves causing an ammonia release.

3

Watch for 10-15 minutes for a rise in the pressure which would be indicative of a leak. Repair any leaks and once tight, proceed to Step 4. Slowly open isolation valve/s downstream of line break to pressurize the piping or equipment with vapor and then leak check all repairs. When certain there are no leaks, return all control valves to their normal operating positions.

4

If possible, leak check at 5-10 psig first and then again at full system pressure.

5

6.

Slowly open isolation valve/s upstream of line break.

Verify that all tags have been marked from the tagout log.

7.

Place equipment back into operation and then monitor closely to verify proper operation with correct operating pressures and temperatures.

Re-check for leaks and re-tighten all flange bolts after they cool down.

Procedure: Line Breaking Reviewed: 10/26/2023

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