* represents approximate ISO standard minimum 

Re

 number limit

* represents approximate ISO standard minimum 

Re

 number limit

 

8631-10 13,500 

95,200 

107,100 

117,900 

122,900 

127,700 

134,600

 

8631-12 18,650 

134,900 

151,700 

166,800 

173,800 

180,600 

190,300

 8631-14 

22,140 

160,200  180,100 

198,000  206,400  214,400 

225,900

 8631-16 

29,180 

211,100  237,500 

261,100 

272,100 

282,600 

297,800

 8631-18 

37,200 

269,200  302,700 

332,800  346,800  360,300 

379,600

 8631-20 

46,670 

334,200  375,800 

413,200 

430,600  447,400 

471,300

 8631-22 

56,730 

406,300  456900 

502,300 

523,500  543,800 

572,900

 8631-24 

67,780 

485,400  545,800 

600,100 

625,400  649,700 

684,500

 8631-26 

79,060 

566100  636,700 

700,000 

729,500 

757,800 

798,400

 8631-28 

92,010 

658,900  741,000 

814,600 

849,000  882,000 

929,100

 8631-30 

105,900 

758,600  853,200 

938,000 

977,500  1,016,000  1,070,000

 8631-32 

122,100 

865,400  973,300  1,070,000  1,115,000  11,58,000  1,220,000

 8631-34 

138,200 

979,300  1,101,000  1,211,000  1,262,000  1,311,000  1,381,000

 8631-36 

155,200  1,100,000  1,237,000  1,360,000  1,418,000  1,473,000  1,551,000

 8631-38 

173000  1,228,000  1,381,000  1,518,000  1,582,000  1,644,000  1,732,000

 8631-40 

192,300  1,363,000  1,533,000  1,685,000  1,756,000  1,824,000  1,922,000

 M8631-250 

362 

2,550 

2,869 

3,158 

3,292 

3,421 

3,605

 

M8631-300 500  3,614 4,064 4,469 4,656 4,838  5,098

 M8631-350 

593 

4,292 

4,825 

5,305 

5,530 

5,744 

6,052

 M8631-400 

782 

5,656 

6,363 

6,995 

7,290 

7,571 

7,978

 M8631-450 

997 

7,212 

8,110 

8,916 

9,291 

9,653 

10,170

 M8631-500 

1,250 

8,954 

10,068 

11,070 

11,536 

11,986 

12,627

 M8631-550 

1,520 

10,885 

12,241 

13,457 

14,025 

14,569 

15,349

 M8631-600 

1,816 

13,004 

14,623 

16,077 

16,755 

17,406 

18,338

 M8631-650 

2,118 

15166 

17,058 

18,754 

19,544 

20,302 

21,390

 M8631-700 

2,465 

17,653 

19,852 

21,824 

22,746 

23,630 

24,891

 M8631-750 

2,837 

20,324  22,858 

25,130 

26,188 

27,220 

28,666

 M8631-800 

3,271 

23,185 

26,076 

28,666 

29,872 

31,024 

32,685

 M8631-850 

3,703 

26,236  29,497 

32,444 

33,810 

35123 

36,998

 M8631-900 

4,158 

29,470 

33,140 

36,436 

37,990 

39,463 

41,553

 M8631-950 

4,635 

32,899  36,998 

40,669 

42,383 

44,044 

46,402

 M8631-1000 

5152 

36,516 

41,071 

45,143 

47,045 

48,867 

51,492

Sizing Chart scfh air 
(60°F; 14.696 psia;
 S.G. 1.0) Class
150 ANSI Flanges

Sizing Chart Nm

3

/hr 

air (0°C; 760mm Hg; 
S.G. 1.0) PN 10 DIN 
Flanges

8631 (nominal pipe siz

e inches)

8631 (nominal pipe siz

e mm)

Diff erential Pressure (In. w.c.)

Diff erential Pressure (mbar)

0.03*

0.075*

1.5

3.736

1.9

4.733

2.3

5.729

2.5

6.227

2.7

3

6.725

7.473

Capacity | 8631 Venturi

Bulletin 8631

page 6

Catalog Combustion 2021 - Page 1615

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