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Bulletin 71.4:MR98

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Table 8. Water Relief Capacities in Gallons per Minute / L/min, Types MR98L and MR98LD with Metal Diaphragm

NOMINAL

BODY

SIZE,

In. / DN

SPRING

RELIEF PRESSURE

RANGE

COLOR

CODE

RELIEF

PRESSURE

SETTING

PRESSURE BUILD-UP OVER RELIEF SETTING, psig / bar

2 / 0.14 4 / 0.28  8 / 0.55 

psi bar psig bar GPM l/min GPM l/min GPM l/min GPM l/min GPM l/min

1/4 NPT

2 to 7 0.14 to 0.48 Yellow

2 0.14 1.5 5.67 2.2 8.13 2.8 10.6 3.4 12.9 4 15.1

5 0.34 2.1 7.94 2.9 10.8 3.6 13.6 4 14.9 4.3 16.3

6 to 14 0.41 to 0.97 Green 10 0.69 1.9 7.19 2.9 10.8 3.8 14.4 4.3 16.3 4.8 18.2

12 to 25 0.83 to 1.7 Red

15 1.0 2.1 7.94 3.1 11.7 4.1 15.5 4.7 17.6 5.2 19.7

20 1.4 2.3 8.7 3.4 12.9 4.5 17 5.1 19.1 5.6 21.2

25 1.7 2.5 9.46 3.7 13.8 4.8 18.2 5.4 20.2 5.9 22.3

20 to 38 1.4 to 2.6 Blue

25 1.7 2.2 8.32 3.3 12.5 4.4 16.6 5 18.7 5.5 20.8

30 2.1 2.4 9.08 3.6 13.4 4.7 17.8 5.3 20 5.9 22.3

35 2.4 2.2 8.32 3.5 13.2 4.8 18.2 5.5 20.8 6.2 23.5

1/2 / 15

2 to 7 0.14 to 0.48 Yellow

2 0.14 4.9 18.5 6.5 24.6 8.1 30.6 9.3 35.2 11 39.7

5 0.34 6.5 24.6 8 30.3 9.5 35.9 11 40.3 12 44.6

6 to 14 0.41 to 0.97 Green 10 0.69 6.7 25.3 8.7 32.7 11 40.1 12 44.5 13 48.8

12 to 25 0.83 to 1.7 Red

15 1.0 6.2 23.5 8.6 32.5 11 41.6 12 46.7 14 51.8

20 1.4 7.1 26.9 9.7 36.5 12 46.2 14 51.1 15 56

25 1.7 7.1 26.9 10 37.6 13 48.4 14 53.9 16 59.4

20 to 38 1.4 to 2.6 Blue

25 1.7 4.5 17 7 26.3 9.4 35.6 11 42.4 13 49.2

30 2.1 4.7 17.8 7.2 27.2 9.7 36.7 12 43.9 14 51.1

35 2.4 4.9 18.5 7.4 28 9.9 37.5 12 44.8 14 52.2

3/4 and 1 /

20 and 25

2 to 7 0.14 to 0.48 Yellow

2 0.14 8.9 33.7 12 44.5 15 55.2 17 63.9 19 72.6

5 0.34 11 41.6 14 52.2 17 62.8 19 71.1 21 79.4

6 to 14 0.41 to 0.97 Green 10 0.69 13 47.3 16 60 19 72.6 21 80.4 23 88.1

12 to 25 0.83 to 1.7 Red

15 1.0 11 40.6 15 56.4 19 72.2 21 80.1 23 88

20 1.4 11 43.5 16 60.2 20 76.9 23 85.5 25 94.2

25 1.7 12 44.6 16 62.2 21 79.8 24 89.1 26 98.5

20 to 38 1.4 to 2.6 Blue

25 1.7 10 39.3 15 57.3 20 75.3 23 85.9 26 96.5

30 2.1 10 39 15 57.7 20 76.4 23 87.2 26 98

35 2.4 11 40.1 16 59 21 77.9 24 89.3 27 101

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 39 40

Bulletin 71.4:MR98 1

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