離心鑄造球墨鑄鐵管適用于輸送水、煤氣及其他流體。球鐵管均采用柔性接口。按接口型式分為機(jī)械式、滑入式兩類。機(jī)械接口型式又分為Nl型、x型和s型三種,滑入式接口型式為T型。
(1)尺寸和形狀見圖6-7~圖6-10、表6-174~表6-180。
圖6-7 N1型膠圈機(jī)械接口
1一螺母2--螺栓3一壓蘭4--膠圈 5--支撐圈 6--管體承口 7--管體插口
表6-174 N1型接口球鐵管的尺寸 (mm)
公稱口徑DN |
尺 寸 |
承口法蘭盤外徑Dl |
螺孔中心圓直徑D2 |
承口內(nèi)徑D3 |
A |
C |
P |
L |
F |
R |
a |
M |
螺栓孔 |
d |
n/個(gè) |
100 |
262 |
210 |
138 |
18 |
12 |
95 |
10 |
75 |
40 |
10° |
45 |
23 |
4 |
150 |
313 |
262 |
189 |
100 |
6 |
200 |
366 |
312 |
240 |
13 |
11 |
77 |
250 |
418 |
366 |
293.6 |
21 |
12 |
83 |
300 |
471 |
420 |
344.8 |
14 |
13 |
85 |
8 |
350 |
524 |
474 |
3916 |
15 |
87 |
10 |
400 |
578 |
526 |
477.6 |
24 |
14 |
89 |
500 |
686 |
632 |
552 |
16 |
15 |
97 |
50 |
24 |
14 |
600 |
794 |
740 |
654.8 |
26 |
llO |
16 |
10l |
60 |
16 |
700 |
898 |
844 |
757 |
17 |
17 |
106 |
圖6-8 X型膠圈機(jī)械接口
l一螺母2--螺栓3一壓蘭4—膠圈5--支承圈
6--管體插口7--管體承口
表6-175 X型接口球鐵管的尺寸 (mm)
公稱口徑DN |
尺 寸 |
法蘭盤外徑D1 |
螺孔中心圓直徑D2 |
承口內(nèi)徑D3 |
A |
C |
P |
L |
F |
R |
a |
M |
螺栓孔 |
d |
n/個(gè) |
100 |
262 |
210 |
126 |
18 |
12 |
95 |
10 |
75 |
32 |
15° |
50 |
23 |
4 |
150 |
313 |
262 |
177 |
100 |
6 |
200 |
366 |
312 |
228 |
13 |
11 |
77 |
250 |
418 |
366 |
279.6 |
21 |
12 |
83 |
40 |
300 |
471 |
420 |
330.8 |
14 |
13 |
85 |
8 |
350 |
524 |
474 |
382 |
15 |
87 |
10 |
400 |
578 |
526 |
433.6 |
24 |
14 |
89 |
50 |
500 |
686 |
632 |
536 |
16 |
15 |
97 |
55 |
24 |
14 |
600 |
794 |
740 |
638.8 |
26 |
110 |
16 |
1O1 |
60 |
16 |
700 |
898 |
844 |
741 |
17 |
17 |
106 |
圖6_9 S型接口
1一螺母2一螺栓3一壓蘭4一密封圈5一隔離圈
6一支撐圈7一管體插口 8一管體承口
表6-176 S型接口球鐵管的尺寸 (mm)
公稱口徑DN |
承口尺寸 |
插口尺寸 |
螺栓孔 |
法蘭盤外徑D1 |
螺孔中心圓直徑D2 |
承口內(nèi)徑
D3 |
承口大徑D5 |
A |
C |
P |
F |
|
R5 |
R |
外徑
D4 |
V |
W |
X |
d |
n/個(gè) |
100 |
252 |
210 |
122 |
150 |
18 |
12 |
90 |
65 |
5 |
23 |
45 |
118 |
+0
1 .5
-1.2 |
20 |
lO |
23 |
4 |
150 |
297 |
2514 |
173 |
20l |
95 |
6 |
24 |
169 |
6 |
200 |
365 |
320 |
226 |
254 |
13 |
100 |
70 |
lO
15 |
25
26 |
55 |
220 |
250 |
418 |
366 |
278 |
306 |
2l |
75 |
271.6 |
300 |
465 |
416 |
330 |
359 |
14 |
105 |
80 |
322.8 |
+0
2
-1.5 |
25 |
15 |
8 |
350 |
517 |
475 |
382 |
411 |
374 |
400 |
577 |
530 |
433.6 |
463 |
24 |
15 |
110 |
425.6 |
12 |
500 |
678 |
630 |
536 |
567 |
16 |
115 |
85 |
18 |
28 |
528 |
600 |
792 |
740 |
638.8 |
67l |
26 |
29 |
66 |
630.8 |
24 |
14 |
700 |
910 |
854 |
74l |
775 |
17 |
120 |
95 |
30 |
733 |
16 |
表6-177 T型接口球鐵管的尺寸 (mm)
公稱口徑DN |
承口尺寸 |
dl |
d2 |
d3 |
d5 |
d6 |
d7 |
d8 |
d9 |
|
loo |
163 |
143 |
±l |
120.5 |
土l |
138.9 |
±1 |
123.4 |
±2 |
142 |
155.7 |
|
8.4 |
150 |
217 |
195 |
172.5 |
190.6 |
175.3 |
195.6 |
2019 |
9.1 |
200 |
278 |
250 |
+1.5
一l |
224.5 |
+1.5
一l |
245.2 |
+1.5一l |
227.8 |
251 |
265 |
9.8 |
250 |
336 |
301.5 |
276.5 |
296.9 |
279.7 |
305 |
318 |
lO.5 |
300 |
393 |
356.5 |
+1.8
—1 |
328.5 |
+1.8
—1 |
351.7 |
+1.8
—1 |
332.1 |
368.5 |
374 |
11.2 |
350 |
448 |
408 |
380.5 |
403.4 |
383.8 |
410.3 |
427.2 |
11.9 |
400 |
500 |
462 |
+2.1
—1 |
431.5 |
+2.1
一1 |
457.2 |
+2.1
—1 |
435.8 |
±2.5 |
463 |
482.4 |
12.6 |
500 |
604 |
568 |
+2.4
-l |
53-4.5 |
+2.4
-1 |
562.6 |
+2.4
-1 |
539.4 |
士3 |
569.7 |
590.6 |
14 |
600 |
713 |
673.4 |
+2.7
-1 |
637.5 |
+2.7
-1 |
668.O |
+2. 7
-1 |
642.6 |
676 |
698.8 |
15.4 |
700 |
824 |
788 |
+3.5
-l |
740.5 |
+3.5
-l |
779.3 |
+3.5
-l |
745.8 |
士3.5 |
789 |
813 |
734 |
16.8 |
800 |
943 |
894 |
+3.8
-1 |
844.5 |
+3.8
-l |
885.9 |
±3.8
1 |
850 |
士3.8 |
8912.2 |
922.3 |
834 |
18.2 |
900 |
1052 |
1000 |
+4.1
-l |
947.5 |
+4.1
—1 |
991.3 |
+4.1
-1 |
953.2 |
±4.1 |
9919.2 |
1030.5 |
937 |
19.6 |
1000 |
1158 |
1105 |
+4.4
—1 |
1050.5 |
+4.4
—1 |
1097.1 |
+4.4
一l |
1056.4 |
土4.4 |
1106 |
1139 |
1040 |
21 |
1200 |
1377 |
1317 |
+5
—1 |
1258 |
十5
—1 |
1308 |
+5
—1 |
1264 |
±5 |
1321 |
1355.6 |
1248 |
23.8 |
公稱口徑
DN |
承口尺寸 |
插口尺寸 |
F |
t1 |
t2 |
t3 |
t4 |
t5 |
t6 |
t7 |
t8 |
t9 |
t10 |
r1 |
r2 |
r4 |
r5 |
D4 |
r3 |
100 |
3.5 |
+O
-O.8 |
88 |
40 |
12 |
6 |
+0
-0.5 |
5 |
8 |
48 |
3 |
39 |
88 |
4 |
5 |
17 |
68 |
118 |
+1
-2.8 |
4 |
150 |
94 |
40 |
12 |
6 |
48 |
43 |
94 |
18.5 |
74 |
170 |
+l
-2.9 |
200 |
4 |
100 |
45 |
15 |
7 |
6 |
10 |
56 |
6.2 |
48 |
100 |
6 |
35 |
70 |
222 |
+1
-3 |
5 |
250 |
105 |
47 |
15 |
7 |
58 |
6.8 |
48 |
105 |
36 |
72 |
274 |
+1
-3.1 |
300 |
4.5 |
110 |
50 |
17 |
8.5 |
7 |
12 |
6l |
7.2 |
56 |
110 |
6 |
7 |
37 |
74 |
326 |
+1
-3.3 |
350 |
+0
-l |
50 |
17 |
8.5 |
61 |
5.1 |
55 |
113 |
24.5 |
98 |
378 |
+l
-3.4 |
6 |
400 |
5 |
55 |
19 |
9.5 |
8 |
14 |
68 |
58 |
116 |
8 |
26 |
104 |
429 |
+l
-3.5 |
500 |
5.5 |
120 |
60 |
21 |
11 |
9 |
16 |
75 |
7 |
63 |
120 |
10 |
29 |
116 |
532 |
+l
-3.8 |
7 |
600 |
6 |
65 |
2l |
12 |
10 |
80 |
9.2 |
62 |
32 |
128 |
635 |
+1
-4 |
700
800 |
7
8 |
+O
-1.2 |
150
160 |
80
85 |
18
19.5 |
18
18 |
12
14 |
12
13 |
90
96.5 |
10.6
12.4 |
77
86.5 |
150
160 |
8
|
|
35
38 |
140
160 |
738
842 |
+1
-4.2 |
9 |
|
|
|
|
|
|
+O
-0.8 |
|
|
|
|
|
|
|
|
|
+l
-4.5 |
900 |
9 |
175 |
90 |
21 |
20 |
16 |
14 |
103 |
14.2 |
92.5 |
175 |
42 |
175 |
945 |
+l
-4.8
+l |
11 |
1000 |
185 |
95 |
22.5 |
15 |
110 |
16 |
103 |
185 |
45 |
200 |
1048 |
- 5 |
1200 |
10 |
215 |
105 |
5 |
23 |
18 |
17 |
122 |
17-8 |
112 |
215 |
10 |
48 |
215 |
1255 |
+1
-5.5 |
12 |
表6-178 Nl型、X型接口球鐵管的質(zhì)量
公稱口徑DN/mm |
外徑D4/mm |
壁厚T/mm |
承口凸部近似質(zhì)量
/kg |
直部一米質(zhì)量/kg |
|
4000 |
|
K8 |
K9 |
K10 |
K12 |
K8 |
K9 |
K10 |
K12 |
K8 |
K9 |
100 |
118 |
6 |
6.1 |
10.1 |
14.9 |
15.1 |
69.7 |
|
150 |
169 |
6.3 |
14.4 |
21.7 |
22.7 |
101 |
|
200 |
220 |
6.4 |
17.6 |
28 |
30.6 |
130 |
|
250 |
271.6 |
6.8 |
7.5 |
9 |
26.9 |
35.3 |
40.2 |
43.9 |
52.3 |
168 |
188 |
300 |
322.8 |
6.4 |
7.2 |
8 |
9.6 |
33 |
44.8 |
50.8 |
55.74 |
66.6 |
212 |
236 |
350 |
374 |
6.8 |
7.7 |
8.5 |
10.2 |
38.7 |
55.3 |
63.2 |
68.8 |
82.2 |
260 |
292 |
400 |
425.6 |
7.2 |
8.1 |
9 |
10.8 |
46.8 |
66.7 |
75.5 |
83 |
99.2 |
314 |
349 |
500 |
528 |
8.0 |
9 |
10 |
12 |
64 |
92 |
104.3 |
114.7 |
137.1 |
432 |
431 |
600 |
630.8 |
8.8 |
9.9 |
11 |
13.2 |
88 |
121 |
137.1 |
151 |
180.6 |
572 |
636 |
700 |
733 |
9.6 |
10.8 |
12 |
14.4 |
96 |
153.8 |
173.9 |
191.6 |
229.2 |
713 |
794 |
表6-178 Nl型、X型接口球鐵管的質(zhì)量
公稱口徑DN/mm |
外徑D4/mm |
標(biāo)準(zhǔn)工作長(zhǎng)度L/mm |
4000 |
5000 |
5500 |
6O00 |
總質(zhì)量/kg |
K10 |
K12 |
K8 |
K9 |
K10 |
K12 |
K8 |
K9 |
K10 |
K12 |
K8 |
K9 |
K10 |
K12 |
100 |
118 |
71 |
84.6 |
86 |
92 |
95 |
100 |
101 |
150 |
169 |
105 |
123 |
128 |
134 |
139 |
145 |
151 |
200 |
220 |
140 |
158 |
171 |
172 |
186 |
186 |
201 |
250 |
271.6 |
203 |
236 |
203 |
228 |
246 |
288 |
221 |
248 |
269 |
315 |
239 |
268 |
290 |
341 |
300 |
322.8 |
256 |
300 |
257 |
287 |
312 |
366 |
279 |
312 |
340 |
399 |
302 |
338 |
368 |
433 |
350 |
374 |
314 |
368 |
315 |
355 |
383 |
450 |
343 |
386 |
417 |
49l |
371 |
418 |
452 |
532 |
400 |
425.6 |
379 |
444 |
380 |
42,4 |
462 |
543 |
414 |
462 |
503 |
592 |
447 |
500 |
545 |
642 |
500 |
528 |
523 |
612 |
524 |
586 |
638 |
750 |
570 |
638 |
695 |
818 |
616 |
690 |
752 |
887 |
600 |
630.8 |
692 |
810 |
693 |
774 |
843 |
991 |
754 |
842 |
919 |
1081 |
814 |
911 |
994 |
1172 |
700 |
733 |
862 |
1015 |
867 |
968 |
1054 |
1244 |
944 |
1054 |
1150 |
1359 |
102l |
1141 |
1246 |
1473 |
注:T=K(O.5+0.001DN),K為系數(shù),取8、9、10、12,其標(biāo)準(zhǔn)壁厚分別為K8級(jí)、K9級(jí)、K10級(jí)、K12級(jí)。
表6-179 S型接口球鐵管的質(zhì)量
公稱口徑DN/mm |
外徑D4
/mm |
壁厚T/mm |
承口凸部近似質(zhì)量
/kg |
直部一米質(zhì)量/kg |
|
4000 |
|
K8 |
K9 |
K10 |
K12 |
K8 |
K9 |
K10 |
K12 |
K8 |
K9 |
100 |
118 |
6.0 |
6.1 |
8.96 |
14.9 |
15.1 |
68.6 |
|
150 |
169 |
6.3 |
11.7 |
21.7 |
22.7 |
98.5 |
|
200 |
220 |
6.4 |
17.8 |
28.0 |
30.6 |
129.7 |
|
250 |
271.6 |
6.8 |
7.5 |
9.0 |
21.8 |
35.3 |
40.2 |
43.9 |
52.3 |
163 |
183 |
300 |
322.8 |
6.4 |
7.2 |
8.0 |
9.6 |
27.5 |
44.8 |
50.8 |
55.74 |
66.6 |
207 |
231 |
350 |
374 |
6.8 |
7.7 |
8.5 |
10.2 |
33.48 |
55.3 |
63.2 |
68.8 |
82.2 |
255 |
287 |
400 |
425.6 |
7.2 |
8.1 |
9.0 |
10.8 |
40.39 |
66.7 |
75.5 |
83 |
99.2 |
307 |
343 |
500 |
528 |
8.0 |
9.0 |
10.0 |
12 |
50.4 |
92 |
104.3 |
114.7 |
137.1 |
419 |
468 |
600 |
630.8 |
8.8 |
9.9 |
11.0 |
13.2 |
65.18 |
121 |
137.1 |
151 |
180.6 |
549 |
614 |
700 |
733 |
9.6 |
10.8 |
12.0 |
14.4 |
85.41 |
153.8 |
173.9 |
191.6 |
229.2 |
701 |
781 |
表6-179 S型接口球鐵管的質(zhì)量
公稱口徑DN/mm |
外徑D4
/mm |
標(biāo)準(zhǔn)工作長(zhǎng)度L/mm |
4000 |
5000 |
5500 |
6O00 |
總質(zhì)量/kg |
K10 |
K12 |
K8 |
K9 |
K10 |
K12 |
K8 |
K9 |
K10 |
K12 |
K8 |
K9 |
K10 |
K12 |
100 |
118 |
69.4 |
83.5 |
84.5 |
90.9 |
92.1 |
98.4 |
99.7 |
150 |
169 |
102.4 |
119 |
126.4 |
131.4 |
137.4 |
142.4 |
149.4 |
200 |
220 |
141 |
158 |
17l |
172 |
186 |
186 |
201 |
250 |
271.6 |
198 |
23l |
199 |
223 |
241 |
284 |
216 |
243 |
263 |
3lO |
234 |
263 |
285 |
336 |
300 |
322.8 |
251 |
294 |
252 |
282 |
307 |
36l |
274 |
307 |
334 |
394 |
296 |
332 |
362 |
427 |
350 |
374 |
309 |
363 |
310 |
350 |
378 |
445 |
338 |
38l |
412 |
486 |
366 |
413 |
447 |
527 |
400 |
425.6 |
373 |
4317 |
374 |
418 |
456 |
536 |
407 |
455 |
497 |
586 |
440 |
493 |
539 |
636 |
500 |
528 |
509 |
599 |
511 |
572 |
624 |
736 |
557 |
624 |
681 |
805 |
6∞ |
676 |
739 |
873 |
600 |
630.8 |
669 |
788 |
670 |
75l |
820 |
968 |
73l |
819 |
896 |
lO59 |
791 |
888 |
97l |
1149 |
700 |
733 |
852 |
1092 |
854 |
955 |
1043 |
123l |
931 |
1042 |
1139 |
1346 |
1008 |
1129 |
1235 |
146l |
表6-180 T型接口球鐵管的質(zhì)量
公稱口徑DN/mm |
外徑D4
/mm |
壁厚T/mm |
承口凸部近似質(zhì)量
/kg |
直部一米質(zhì)量/kg |
|
4000 |
|
K8 |
K9 |
KlO |
K12 |
K8 |
K9 |
K10 |
K12 |
K8 |
K9 |
100 |
118 |
6.O |
6.1 |
4.3 |
14.9 |
15.1 |
63.9 |
|
150 |
170 |
6.3 |
7.1 |
21.8 |
22.8 |
94.3 |
|
200 |
222 |
6.4 |
1O.3 |
28.7 |
30.6 |
125 |
|
250 |
274 |
6.8 |
7.5 |
9.O |
14.2 |
35.6 |
40.2 |
44.3 |
53 |
157 |
175 |
300 |
326 |
6.4 |
7.2 |
8.0 |
9.6 |
18.9 |
45.3 |
50.8 |
56.3 |
67.3 |
200 |
222 |
350 |
378 |
6.8 |
7.7 |
8.5 |
lO.2 |
23.7 |
55.9 |
63.2 |
69.6 |
83.1 |
247 |
277 |
400 |
429 |
7.2 |
8.1 |
9.O |
10.8 |
29.5 |
67.3 |
75.5 |
83.7 |
100 |
299 |
332 |
500 |
532 |
8.O |
9.O |
lO.O |
12.O |
42.8 |
92.8 |
104.3 |
115.6 |
138 |
414 |
460 |
600 |
635 |
8.8 |
9.9 |
11.0 |
13.2 |
59.3 |
122 |
137.3 |
152 |
182 |
547 |
609 |
700 |
738 |
9.6 |
10.8 |
12.O |
14.4 |
79.1 |
155 |
173.9 |
193 |
231 |
699 |
775 |
800 |
842 |
10.4 |
11.7 |
13.O |
15.6 |
102.6 |
192 |
215.2 |
239 |
286 |
871 |
963 |
900 |
945 |
11.2 |
12.6 |
14.0 |
16.8 |
129.O |
232 |
260.2 |
289 |
345 |
1057 |
1170 |
1000 |
1048 |
12.O |
13.5 |
15.0 |
18.O |
161.3 |
275 |
309.3 |
343.2 |
4ll |
1261 |
1399 |
1200 |
1255 |
13.6 |
15.3 |
17.0 |
20.4 |
237.7 |
374 |
420.1 |
466.1 |
558 |
1734 |
1918 |
表6-180 T型接口球鐵管的質(zhì)量
公稱口徑DN/mm |
外徑D4
/mm |
標(biāo)準(zhǔn)工作長(zhǎng)度L/mm |
4000 |
5 000 |
5 500 |
6 000 |
總質(zhì)量/kg |
K10 |
K12 |
K8 |
K9 |
K10 |
K12 |
K8 |
K9 |
K10 |
K12 |
K8 |
K9 |
K10 |
K12 |
100 |
118 |
64.7 |
78.8 |
79.8 |
86.3 |
87.4 |
93.7 |
94.9 |
150 |
170 |
98.8 |
116 |
121 |
127 |
133 |
138 |
144 |
200 |
222 |
133 |
154 |
163 |
168 |
179 |
183 |
194 |
250 |
274 |
191.4 |
226 |
192 |
215 |
236 |
279 |
210 |
235 |
258 |
306 |
228 |
255 |
280 |
332 |
300 |
326 |
244 |
288 |
245 |
273 |
300 |
355 |
268 |
298 |
329 |
389 |
290 |
323 |
357 |
422 |
350 |
378 |
302 |
356 |
303 |
340 |
372 |
439 |
331 |
371 |
407 |
481 |
359 |
403 |
441 |
522 |
400 |
429 |
364 |
430 |
366 |
409 |
448 |
530 |
400 |
445 |
490 |
580 |
433 |
483 |
532 |
630 |
500 |
532 |
505 |
595 |
507 |
564 |
67l |
733 |
553 |
616 |
679 |
802 |
600 |
669 |
736 |
87l |
600 |
635 |
667 |
787 |
669 |
746 |
819 |
969 |
730 |
814 |
895 |
1060 |
791 |
883 |
971 |
1151 |
700 |
738 |
851 |
1003 |
854 |
949 |
1044 |
1234 |
912 |
1036 |
1141 |
1350 |
1009 |
1126 |
1237 |
1465 |
800 |
84, 2 |
1059 |
1247 |
1063 |
1179 |
1298 |
1535 |
1159 |
1286 |
1417 |
1676 |
1255 |
1394 |
1537 |
1819 |
900 |
945 |
1285 |
1509 |
1289 |
1430 |
1574 |
1854 |
1405 |
1560 |
1719 |
2027 |
152l |
1690 |
l863 |
2109 |
1000 |
1048 |
1533 |
1805 |
1536 |
1708 |
1876 |
2216 |
1674 |
1862 |
2048 |
2422 |
18Il |
2017 |
2221 |
2627 |
1200 |
1255 |
2102 |
2470 |
2108 |
2338 |
2568 |
3028 |
2295 |
2548 |
280l |
3307 |
2482 |
2758 |
3034 |
3586 |
圖6-10 T型接口
(2)外形
(1)當(dāng)管子在間距約為管長(zhǎng)L2/3的兩個(gè)臺(tái)架上滾動(dòng)校驗(yàn)時(shí),球鐵管的直線度最大偏差ƒm(mm)不應(yīng)大于管有效長(zhǎng)度L(m)的1.25倍,即ƒm≤1.25L。
(2)球鐵管端面應(yīng)與軸線相垂直。
(3)尺寸偏差見表6-181。
表6-181球鐵管的尺寸偏差
項(xiàng) 目 |
指 標(biāo) |
NI型、X型、S型接口的承口內(nèi)徑、插口外徑偏差 |
公稱口徑DN/mm |
承口內(nèi)徑/mm |
插口外徑/mm |
≤300 |
+2
-l |
+1
-3 |
350~700 |
+3
-1 |
+l
-4 |
T型接口偏差 |
見表6-177 |
承口深度偏差 |
±5mm |
壁厚偏差 |
管體壁厚負(fù)偏差為(1.3+0.001DN)mm
承口壁厚負(fù)偏差為(1.3+0.001DN)mm
法蘭盤厚度偏差為±(2+0.05A)mm |
長(zhǎng)度偏差 |
標(biāo)準(zhǔn)工作長(zhǎng)度偏差±250mm
制造工作長(zhǎng)度偏差±30mm |
(4)材質(zhì)球鐵管的材質(zhì)應(yīng)為鐵素體基體的球墨鑄鐵。在組織中應(yīng)有一定數(shù)量的球狀石墨。
(5)力學(xué)和工藝性能見表6-182、表6-183。
表6-182球鐵管的力學(xué)性能
公稱口徑DN/mm |
抗拉強(qiáng)度ób/MPa |
屈服強(qiáng)度ó0.2/Mea |
伸長(zhǎng)率δ(%) |
≥ |
100~1 000 |
420 |
300 |
lO |
l200 |
7 |
注:1.屈服強(qiáng)度僅在專門協(xié)定時(shí)或定貨中有規(guī)定的情況下適用。
2.球鐵管應(yīng)能進(jìn)行機(jī)械加工,球鐵管表面硬度不得大于230HBS。
表6-183球鐵管的水壓試驗(yàn)
公稱口徑DN/mm |
試驗(yàn)壓力/MPa |
K8 |
K9 |
K10 |
K12 |
最高試驗(yàn)壓力 |
≤300 |
4 |
5 |
lO |
350~600 |
3.2 |
4 |
5 |
7.2 |
8 |
700~1000 |
2.5 |
3.2 |
4 |
6 |
6 |
1200 |
1.8 |
2.5 |
3.2 |
4 |
4 |
注:用于輸送氣體的球鐵管應(yīng)進(jìn)行氣密性試驗(yàn),試驗(yàn)以空氣為介質(zhì),試驗(yàn)壓力不小于0.3MPa,也可根據(jù)供需雙方協(xié)議商定。
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