ML18018A817
| ML18018A817 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 05/04/1973 |
| From: | SOUTHWEST FABRICATING & WELDING CO. (SUBS. OF IU |
| To: | |
| Shared Package | |
| ML18018A805 | List: |
| References | |
| 4-106, NUDOCS 8310130285 | |
| Download: ML18018A817 (5) | |
Text
PROCEDURE NUMBER
'-106 COLD BENDING OF CARBON STEEL 6 FERRIT'EC ALLOY SUBMITTEDTO FOR CONTRACT NO.
SF'.O.
NO.
SUPPLEMENT NO.
ATTACHMENTNO.
E PAGE NO.
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a/a 3
PROCEDURE REVISION NO. 5 DATE 8SSOXSOZaS SS0919
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~ FABRMQlNG COLD BENDING %'ARBON STEEL hm FZRRITIC ALLOY pl<. </
r'AVE 1
OF DATE 4"30-73 1.
Cold bending fs defined ao formiag at temperatures belov 700 F.
2.
Pipe shall be selected oo that the minimum vali thickness after bendfng shall be aot leao thea the calculated mfnimum vali thfckness required for atrafght pipe.
3, Qelded pipe shall have the longitudinal seam oa thc neutral axis of the, bend.
4.
The centerline radius of a bend villaot normally be less than five (5) times the nominal pipe diameter aad shall aot be less than permitted by Fig. 2 ia XVI Std ES-3 5.
Bending dfes shall bc used vhcn they are available at Southvest Fabricating 6 Melding Co.
methods and controls shall be such that the'ifference betMeen the maximum and minimum diameter at any cross section of the bend shall aot exceed 8X of the average measured outside diameter of the straight portion of the pipe.
6.
Buckling shall be kept to an absolute minimum and shall not exceed the limits specified fa PFI Std RS-3 oad outlined belov:
a)
The maxfmum vertical height of any vave, measured from thc average height of tvo od)ofning crests to the valley, ohall not exceed Z, of the nominal pfpe ofse.
b)
We minimum ratfo of thc distance betveen crests as compared to the height bctveen crests and thc included valley shall be 12 to 1.
-c)
Suckles exccedfng the limits defined ia a) and b) above shall aot be repaired vfthout approve of the Hanager,of Quality hssurance.
7.
%here surface checking fo evident, it shall be removed by grinding aad the ground ourface ohall be examined using an approved liquid penetrant or magnetfc particle procedure.
8.
Carbon otccl bends vith vali thickness greater thea 3/4" shall bc strays relieved.
- 9. Ferritic alloy beads greater than 4" pipe ofse
.and over 1/2"'vali thfck-ness Iha11 be stress relfevedi '-
10'errftfc alloy bends vith a bend diameter less than 20 pipe diameters shall be stress relieved.
REVISION DATE APPROVED po A
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4-106 COLD BENDIHG OF CARBON STEEL hND PERRITIC ALLOYS PAGE OF DATE 3-26-74 SUP puneNT 01 S.
O. 3301 thru 3304 2y~, </
Change Paragraph III4 to read:
4.
The centerline radius of a bend shall not be less than five times the nominal pipe diameter.
Change the aeeond aentenoe od par tar pah d5 to read:
methods and controls shall be such that the difference between the maximum and minimum diameter at any cross section of the bend shall not exceed 6X of the average eeasured outside diameter of the straight portion of the pipe or tlto
'inches (2") vhichever is greater.
Change Paragraph 6 (a) to read:
6.
a)
The maximum vertical height of any vave, measured from the average height of too adjoining crests to the valley, shall not exceed 3/8" in depth over a 12" length.
Approved:
REVISION 6Y DATE
. APPROVED
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