The Safety Valve - Leser.ru

Applications:
6
3 4
2 1
5
• Large scale chemical plant
– Tank protection
– Blow-down systems
• Oil extraction, transport and processing
– Drilling platforms
– Oilfields (“Christmas trees”)
– Storage tank facilities
– Refineries
3
API 526 is a purchase specification in which nominal diameters [1],
flange pressure ratings [2], centre to face dimensions [3], flow areas [4],
body [5] and spring materials [6], and their service limits are stipulated for
“API safety valves”.
API safety valves are used worldwide in the petrochemical industry, both
on- and off-shore. These applications are characterised by standardised
plants, blow-down systems and long pipework sections. The capacities
of API safety valves are relatively low in relation to their nominal diameters.
The LESER type 526 combines the requirements of the API standards
and the ASME Code with the tried and tested service reliability of the
LESER product range.
Section VIII Div 1
- UG 125 – UG137
Approval
ASME B 16.5
ASME-Code
API
Section II
- SA 216, 217, 351
RP 520
STD 526
STD 527
Materials
Sizing
Nominal diameters
Pressure ratings
Orifice letters
Materials
Functional leak tightness
ASME B 16.34
Orifice
letter
“Orifice”
E
Flow area
according to API 526
mm 2
sq.in
D 71,0 0,110
126 0,196
Flow diameter
according to API 526
mm
inch
9,5 0,4
12,7 0,5
F 198 0,307
15,9 0,6
100
Lift (%)
G
325 0,503
H 506 0,785
20,3 0,8
25,4 1,0
80
J
830 1,287
32,5 1,3
min.
60
K 1 186 1,838
L
1 841 2,853
38,9 1,5
48,4 1,9
M 2 323 3,600
54,4 2,1
40
N
2 800 4,340
59,7 2,4
P 4 116 6,380
72,4 2,8
20
Q
7 129 11,05
95,3 3,8
max.
0
10
Blowdown
8 6
4
2
Overpressure (%)
0 2 4 6 8 10
R 10 323 16,00
T
16 774 26,008
114,6 4,5
146,1 5,8
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