ML18018A818
| ML18018A818 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 05/04/1973 |
| From: | SOUTHWEST FABRICATING & WELDING CO. (SUBS. OF IU |
| To: | |
| Shared Package | |
| ML18018A805 | List: |
| References | |
| 4-107, NUDOCS 8310130287 | |
| Download: ML18018A818 (4) | |
Text
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FABRfCAnNG ILVVIIIIV(iso IWVa '-svi COLD BENDING QF hVSTENITZC SThINLESS STEEL PIPING 2/c. 4'I YAQE 1
OF 1
DATE 4-30 73 1.
Cold bending is defined as forming at temperatures belov 800 F.
2 Pipe shall be selected so that the minimum vali thickness after bending mill be not less than the calculated minimum ~a11 thickness required for straight pipe.
3.
Welded pipe shal) have the longitudinal seam on the neutral axis of the bend.
4.
'The centerline radius of a bend vi11 not normally be less than five (5) times the nominal pipe diameter'and shall not be less than permitted by Fig. 2 in PPZ Std ES-3.
5.
Sending dies shall be used
@hen they are available at Southwest Fabricating 6 Welding Co.
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 8% 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 in PPZ STD ES-3 and outlined below:
a)
The maximum vertical height of any vave, measured from the average height of two ad)oining crests to the valley, shall not exceed W
of the nominal pipe size.
b)
The minimum ratio of the distance between crests as compared to the height between crests and the included valley shall be 12 to 1.
c)
Buckles exceeding the limits defined in a) and b) above shall not be repaired without approval of the Manager of ality Assurance.
7.
Where surface checking is evident, it shall be removed by grinding and the ground surface shall be examined using an approved liquid penetrant procedure REVISION SY DATE APPROV EDP',n ay~ype'Ie~~~~i ee;Xr~S>>,
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PROPEDURF.
NO:
4-107 COLD BENDING OF hUSTENITIC STAINLESS STEEL PIPE PAGE 10FI DATE 3-26-74 SUPPLANT Oi S. 0. 3301 thru 3304 Change Paragraph 41 to read:
Cold bending is defined as forming at temperatures helm 700 P.
Change Paragriph A to read:
4.
The centerline radius of a bend shall not be less than five (5) times the nominal pipe diameter.
Change the ascend sentence gn Paragraph tg tn read:
methods and controls shall be such that the difference betveen the maximum and minimum diameter at any cross section of the bend shall not exceed 6% of the average measured outside diameter of the straight portion of the pipe or tvo inches (2") whichever is greater.
Change Paragraph 6 (a) to read:
6.
a)
The maximum vertical height of any vave, measured from the average height of too ad)oining crests to the valley, shall not exceed 3/8" in depth over. a 12gg length.
~ ar hpproved:
REVISION BY PATE