Technical Requirements for Finned Piping

Gerernal Technical Requirements for Finned Piping

This specification covers external, high frequency resistance welded fins on pipes for use in catalyst withdrawal line to reduce the catalyst temperature, flare line, process line to reduce /increase temperature.

Scope of Supply for Finned Piping

Scope for finned piping shall include supply of finned pipe spools of required lengths as per data sheets / specifications etc. attached with this MR. Base pipe for the finned pipe shall be as per Schedule for the Finned Pipe (A545-111-16-43-3389) and fins shall be high frequency resistance welded on the base pipe.

Bidder to note that no. of finned pipes/ spools shall be decided based on cut lengths in isometrics and with minimum 50 mm non finned pipe on both ends (Bevel Ends). Bidder to note that preliminary Piping Isometrics provided with MR are for spool planning only.

Final Piping isometrics marked up with finning pipe spools shall be provided to successful bidder for compliance for Finned Piping.

Bidder shall provide finned pipe spools excluding fittings, flanges, supports etc. Also at branch, support locations as per the isometrics, suitable space to be left in finning and no finning is required at such locations.

Finned Pipe Specification

Finned pipe shall be as per schedule for finned pipe (A545-111-16-43-DS-3389) attached with the MR.

Pipe with beveled ends shall be in accordance with ASME B16.25. Weld contours shall be as follows: Material Wall Thickness Weld Contour Carbon Steel (Except Low Temp. Carbon Steel) Up to 22 mm Figure 2 Type A > 22 mm Figure 3 Type A, Alloy Steel, Stainless Steel & Low Temp. Carbon Steel Up to 10 mm Figure 4, > 10 mm & Up to 25 mm Figure 5 Type A, > 25 mm Figure 6 Type A, All 1Cr-½Mo and 1¼Cr-½Mo seamless pipes shall be normalised and tempered.

Bidder to note that for pipes with H2 service, following hardness testing requirements of ASME B

31.12 shall be followed Hardness test shall be performed with a portable hardness tester where specified in accordance with ASTM A833 or ASTM E10. The maximum hardness allowed shall be as specified under CS :200 BHN; < 2% Cr :225 BHN; 2.25% < Cr < 10% :241 BHN

Weldment those do not meet the hardness test requirements (hard welds) shall be removed and replaced. Additional heat treatment to correct hardness of weldment is permissible provided it is supported by approved WPS and final hardness testing after heat treatment confirms that required hardness has been achieved.

Other Technical Requirement for Finned Piping

For finning specifications refer schedule for finned pipes (A545-111-16-43-DS-3389) and Datasheet for finned pipe (A545-161-02-DS-PR000080).

Fin material shall be equivalent to pipe material.

Shipping for Finned Piping

All attachments in MR e.g. Technical Requirement for Finned Piping, Datasheets, Schedule for

Finned Pipes, Inspection Requirement etc. are to be complied by the bidder.

Hydrotest for Finned Piping

Finned pipes shall be shipped in wooden crates lined with plastic sheets from inside. Pipes shall be banded together and separated from each other by wooden blocks. Both ends of the pipes shall be protected with wood, metal or plasctic cover. Finned pipes are received in rust and corrosion free, damage free and good condition at site.

Documentation for Finned Piping

Bidder to note that finned pipe shall be hydrostatically tested as per applicable standard after finning by bidder only.

Marking for Finned Piping

The requirement of documentation for review / information / record of Purchaser shall be as per A545-111-16-43-VDR-3389. Each pipe shall be marked with Tag No. followed by serial no of that cut length as marked in Isometrics.

Deviations for Finned Piping

Bidder Shall clearly indicate all deviations and exceptions seperately at one place with reasons for seeking deviations and highlight the corresponding clauses for the attached documents/specifications, standards of this Material Requisition.

Technical Requirements for Finned Piping