TIE-INs Method Statement
TIE-INs Method Statement
(OP)
To Piping Experts: I'm new to piping industry, and I would like to learn about Tie-ins between new and existing piping system. How would you suggest a method statement for Tie-ins, both cold and hot tapping starting from spools fabrication at work shop all the way to hydrostatic pressure test after erection?
Thanks guys.
Thanks guys.





RE: TIE-INs Method Statement
Tie-In Planning (With suggested primary responsibility)
1. Identify each Tie-In(s) schematic location on P&ID - Process Engineer
2. Review with Piping - Process & Piping Design
3. Create a Tie-In Index (or List) with key information about each Tie-In - Piping Design & Process Engineer
4. Review with Client - Process Engineer
5. Go to the Field to locate physical point of Tie-In - Piping Design/Process
6. Meet with plant personnel and review Tie-In requirements - Piping Design, Process, Plant Operations, Safety
7. Discuss different types and configurations of Tie-Ins - Piping Design, Process and Plant personnel
8. Establish physical Tie-In location point and type - Piping Design & Plant Personnel
9. Define if the line can be shut –down, when, how long, draining, depressurize, steam-out and other safety issues - All personnel
10. Visually inspect the existing pipe. Are more extensive tests needed to determine condition and suitability for the Tie-In? - Piping Design and Plant personnel
11. Mark or tag the selected Tie-In point - Piping Design & Plant Personnel
12. Photograph the Tie-In point - Piping Design
13. Draw sketch and take all required measurements - Piping Design
14. Determine locations of all existing block valves, vents and drains - Piping Design
15. Determine the location of all existing anchors and guides - Piping Design
16. Based on selected Tie-In location and type determine if additional vents or drains will now be required - Piping Design, Plant Operations
17. Include new vents or drains (if any) on sketch - Piping Design
18. Insure that this process is followed for all Tie-Ins - All participants
19. Get plant personnel to sign off on all data collected in the field - Piping Design & Process Engineering
20. In the office modify the P&ID as required - Process Engineer
21. Convert all field sketches into appropriate production drawings (Isometrics) - Piping Design
22. Prepare a Plot Plan style “Tie-In Location Key Plan”
23. Update the Tie-In List as required - Piping Design
24. Review all Tie-Ins with Pipe Stress for effect on existing system piping and new system piping - Piping Design
25. Finalize (check, correct and approve) all Tie-In isometric drawings - Piping Design
Additional issues related to Hot Tap Tie=Ins:
The “Hot-Tap” tie-in is more complicated. There are many, many questions and issues that need to be resolved. These include:
• Will the tie-in be a plain Hot-Tap or a more complex “Stopple” tie-in?
• Will this be a single tie-in point or a multiple tie-in point?
• Will the tie-in be made with a “split-Tee” branch or an “O-Let” branch?
• Is there proper space available for the piping fittings and the valve?
• Is there proper space for the Hot-Tap machine and the Hot-Tap operators?
• What is the commodity? Is this commodity safe for doing a Hot-Tap?
• What is the operating pressure? Can the Hot-Tap machinery handle this pressure safely?
• What is the operating temperature? Can the Hot-Tap machinery handle this temperature safely?
• Can flow be maintained (required for cooling) during the cutting part of the Hot-Tap process?
• What is downstream (direction of flow) of the Hot-Tap that might be damaged by the cuttings from the Hot-Tap process?
• Has there been proper consultation with one or more “Hot-Tap” Specialty Contractors?
prognosis: Lead or Lag
RE: TIE-INs Method Statement
As for hot tap, you need to supply the hot tap unit information, like UT measurements at tie-in weld areas, header information, sticker information and header operating data, required by the unit to make the hot tap calculations. PENNPIPERs inputs for hot tap requirements is richer in details. I have experience with "hot tapping" but not with "hot tapping & stopple".
Good luck to you.
RE: TIE-INs Method Statement
I have all the data that I need.. now I'm preparing the Method Statement.
1- Scope
2- Equipment
3- References
4- Personnel Qualification
5- Responsibilities
6- Procedure "Step by Step"
7- Safety
8- Attachments "WPSs"
I'm stuck at "6-Procedure" because, as I mentioned before, I'm a bit new to piping industry.
Tie in description:
Remove 20" 900# blind flange at end of header (Header Name) and connect new pipe spool at (Tie-In point 01) and make connection to existing 20" at (Tie-in point 02).
Material: ASTM A790 Duplex St.St.
Would you suggest a step-by-step procedure, starting from pipe spool fabrication at workshop till installing it in a/m tie-in points, including all activities and hydrotest?
Thanks guys :)
RE: TIE-INs Method Statement
1- UT Thickness readings at Tie-In points.
2- Preparing all required equipment prior to shutdown
3- Hot Bolting before shutdown
4- Fabricating pipe spools at workshop acc. to DWGs, P&IDs, ISO.
5- Welding at workshop
6- NDT and Hyrdo-Test at workshop
7- Spools transportation to site
8- Work Permit
9- Installing permanent and temporary supports
10- Fitup at Tie-in points "flanges, fitting..."
11- Welding on site
12- NDT and Hydro-Test on site
13- Golden welds inspection
14- Flushing and cleaning
15- Removing Tempo. supports
16- Reinstatement
17- end of shutdown and back to service
feed me back on this please.
Thanks