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Baker Hughes
© 2020 Baker Hughes Company. All rights reserved.
A. General Requirements
The safety valve shall be connected to the boiler in a vertical position independent
of any other steam connection and attached as close as possible to the boiler.
Intervening pipe or fittings shall be no longer than the face-to-face dimension
of the corresponding tee fitting of the same diameter and pressure under the
corresponding American Standard as set forth by the ASME.
Thoroughly clean the inlet of the valve before installation and be sure that the proper
gasket is used. Tighten bolts evenly. For 1510 and 1511 Series, the flange bolting
shall be ASTM A307 Grade B per ASME B16.1, and shall be torqued not to exceed
the values shown in Table 1.
The safety valve shall be free from external stresses transmitted from the discharge
piping. Figure 3 illustrates a recommended design allowing for ample clearance
to take care of thermal expansion. The riser pipe should be large enough to
accommodate the full capacity of the valve without causing steam to escape by
flowing backward through the drip pan. In no case should the pipe connected to the
valve be of a smaller size than the valve outlet.
Know all valve exhaust/
leakage points to
avoid possible severe
personal injury or death.
IX. Recommended Installation Practices
Table 1: 1510 & 1511 Series Safety Valve Inlet Flange Bolting Torque
Orifice
Inlet Flange
Size
Inlet Flange
Bolt Size
Bolting Torque (ft-lbs)
Bolting Torque (Nm)
inches
mm
inches
mm
Dry
Lubricated
Dry
Lubricated
H
1 1/2
38.1
3/4
19.1
110
85
149
115
2
50.8
5/8
15.9
60
45
81
61
2 1/2
63.5
3/4
19.1
110
85
149
115
3
76.2
3/4
19.1
110
85
149
115
J
1 1/2
38.1
3/4
19.1
110
85
149
115
2
50.8
5/8
15.9
60
45
81
61
2 1/2
63.5
3/4
19.1
110
85
149
115
3
76.2
3/4
19.1
110
85
149
115
K
2
50.8
5/8
15.9
60
45
81
61
2 1/2
63.5
3/4
19.1
110
85
149
115
3
76.2
3/4
19.1
110
85
149
115
3 1/2
88.9
3/4
19.1
110
85
149
115
4
101.6
3/4
19.1
110
85
149
115
L
2 1/2
63.5
3/4
19.1
110
85
149
115
3
76.2
3/4
19.1
110
85
149
115
3 1/2
88.9
3/4
19.1
110
85
149
115
4
101.6
3/4
19.1
110
85
149
115
M
3
76.2
3/4
19.1
110
85
149
115
3 1/2
88.9
3/4
19.1
110
85
149
115
4
101.6
3/4
19.1
110
85
149
115
4 1/2
114.3
3/4
19.1
110
85
149
115
N
4
101.6
3/4
19.1
110
85
149
115
P
4
101.6
3/4
19.1
110
85
149
115
Q
6
152.4
3/4
19.1
110
85
149
115
