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Hinged Closures

Hinged closures are designed for use where you require frequent access into pressure vessels and lines. They're easy to install and require very little maintenance. Replacement parts are readily available.

Hinged closures are manufactured to meet the requirements of the ASME code for boiler and pressure vessels. Section I and VIII, Division I. Units in stock are made from carbon steel. Stainless Steel closures are available on special order. They can be supplied with carbon steel or stainless steel externals. Please call for prices. L. A. Boiler Works stocks hinged closures for 6" to 24" pipe diameters. These closures are available for 75, 150, or 300 psi service. All closures utilize a standard Buna N, "o" ring seal set in a machined groove in the head. The head and neck of the closures are machined to a matching bevel to ensure full contact between mating surfaces. Gaskets of other material can be furnished for an additional charge.

These hinged closures cannot be opened under pressure. The angle at which the lugs are welded to the neck and head requires the nuts to be turned several turns before they clear the lugs. This safety feature allows any residual pressure to bleed off before opening.

ASME code stamping and partial data reports can be furnished for a nominal charge if requested at the time of ordering.

MATERIAL SPECIFICATIONS
Carbon Steel
Head 2:1 semi-elliptical - SA516 Grade 70 PVQ
Neck A-53-B or A-106-B SMLS pipe
Studs A-193 B7
Nuts A-194 2H
Pins 1018-CR or Better
Lugs A-36 or Better

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hinged closures 1
 hinged closures 2
Pipe
Size
 
75 PSI
150 PSI
300 PSI
A
B
C
D
E
H
T
X
Y
No 
Bolts
Wt.
Part
Number
X
Y
No 
Bolts
Part 
Number
X
Y
No 
Bolts
Part 
Number
6
6 5/8
10 5/8
2 1/2
6
3
8 1/2
7/16
60
120
3
25
CN1963-1A 
60
120
3
CN1963-2A
60
120
3
CN1963-3A
8
8 5/8
12 5/8
3
6
3
9
1/2
60
120
3
39
CN1963-1B
60
120
3
CN1963-2B
60
120
3
CN1963-3B
10
10 3/4
14 3/4
3 1/2
6
3
9 1/2
1/2
60
120
3
48
CN1963-1C
45
90
4
CN1963-2C
45
90
4
CN1963-3C
12
12 3/4
16 3/4
4
6
3
10
1/2
45
90
4
69
CN1963-1D
45
90
4
CN1963-2D
45
90
4
CN1963-3D
14
14
18
4 1/4
6
3
10 1/4
1/2
45
90
4
80
CN1963-1E
0
60
6
CN1963-2E
0
60
6
CN1963-3E
16
16
20
4 3/4
6
3
10 3/4
1/2
0
60
6
90
CN1963-1F
0
45
8
CN1963-2F
0
45
8
CN1963-3F
18
18
22
5 1/4
6
3
11 1/4
1/2
0
60
6
120
CN1963-1G
0
45
8
CN1963-2G
0
45
8
CN1963-3G
20
20
24
5 3/4
6
3
11 3/4
1/2
0
60
6
141
CN1963-1H
0
45
8
CN1963-2H
0
45
8
CN1963-3H
24
24
28
6 3/4
6
3
12 3/4
1/2
0
45
8
185
CN1963-1J
0
36
10
CN1963-2J
0
36
10
CN1963-3J