难道您的热力管道全部都是焊缝组成的?, C' ?) J+ `; S+ z' n4 F, _3 l
现在钢管生产商这么多,钢管本身就不存在问题了?总不能对钢管本体全部UT吧% ]' p# p w p
管道上就没有法兰、螺纹连接了?* P4 i. |! T$ Z- V
这些地方是不是满足使用要求,只有通过试压的办法来解决。 7 W, ]3 F5 O0 L" G4 E综上所述,绝不能用所谓的100%UT代替系统水压试验。
ASME B31.3 Process piping -2006:% L, F" J0 E: n$ J
345.9 Alternative Leak Test ; p5 H; _9 R0 k" T' pThe following procedures and leak test method may 5 L9 q. p# M9 h1 p* {; j$ z: e9 Ube used only under the conditions stated in para., ^! W( R$ Q$ I7 r
345.1(c).# a3 f9 M- E* Z7 T
345.9.1 Examination of Welds. Welds, including : o* p6 ^. s" L4 F0 L( |, |those used in the manufacture of welded pipe and fittings,$ K; B" w6 u K7 t
which have not been subjected to hydrostatic or5 d1 F5 b( f3 y8 A3 i8 W8 z2 K
pneumatic leak tests in accordance with this Code, shall - R6 F: q4 \! R) r6 a# q Wbe examined as follows: ' Q; W4 i3 v& j( W0 w( l79 ; t! B( M% o/ s9 q9 Q(a) Circumferential, longitudinal, and spiral groove6 H( _8 d' [% f$ q1 N6 Q. l
welds shall be 100% radiographed in accordance with : H) U: a8 c* Y0 N0 h2 _6 Jpara. 344.5 or 100% ultrasonically examined in accordance 1 d5 n5 z' u7 V* zwith para. 344.6.1 F7 d; }# ^' V
(b) All welds, including structural attachment welds,( F" |1 {7 U! @; [6 _: X8 B, t3 C
not covered in (a) above, shall be examined using the , w( a; @/ ~' L( i4 |+ u) oliquid penetrant method (para. 344.4) or, for magnetic5 u0 a, t9 X/ S5 x7 e9 @4 W
materials, the magnetic particle method (para. 344.3).
还有,就是同意用NDT替代压力试验了,我们还得选择探伤的方法,看工件的材质,接头形式,厚度,焊接方法等等,选择是用RT UT MT 还是PT. 象这样光说是热力管道,选择100%UT,我们应该是无法说他是正确,还是考虑不周. 6 \ a' W1 V3 Y9 k% H( n; L 欢迎提不同的意见,大家探讨,以学习为目的) v) }8 P' f* Y0 A7 f