Leser 411 Instructions De Service page 19

1 Contents
1 Contents
2 General
3 Testing/marking
4 Pressure
5 Function of a safety valve
6 Functional tightness of a safety valve
7 Medium
8 Temperatures of the medium and ambient
temperatures
9 Choice of spring
10 Safety valves with bellows
11 Safety valves with blow-down ring
12 Safety valves built into installations
12.1 Open bonnet
12.2 Regular lifting operation
12.3 Forces acting on the safety valve
12.4 Connections
12.5 Direction of safety valves
12.6 Flow-through
12.7 Condensation
12.8 Transfer of vibrations from the installation 22
12.9 Discharge pipe
12.10 Unfavourable environmental conditions 23
12.11 Leaks caused by foreign bodies
12.12 Protection during storage and transport 23
12.13 Corrosion protection
12.14 Maintenance
12.15 Identification of safety valves
12.16 Lever safety valves
13 Setting instructions for spring loaded
safety valves
13.1 Lifting device H3
13.2 Lifting device H4
13.3 Spring replacement
14 Handling
15 Supplementary loading system
16 Combined Safety Valve and Bursting Disc
17 Unexpected conditions
18 Product overview
19 Assembly instructions
20 Disclaimer
2 General
The following general notes refer to directly
loaded and controlled safety valves (with
supplementary loading system).
To fulfill its function all components of a safety
valve are manufactured to great precision. Only
this precision allows correct functioning. Safety
valves must therefore be handled with care.
Failure could endanger people, animals and
installations. Even with a correctly functioning
safety valve hazards may occur. This has to be
taken into account.
The following risks could ensue:
a.) The safety valve does not work correctly or is
17 dimensioned incorrectly: the pressure
17 equipment bursts. Hazard caused by the
17 bursting itself and by the hot, poisonous and
18 aggressive medium.
18 b.) The safety valve operates correctly; medium
19 escapes: there is a risk of hot, poisonous
19 and aggressive medium.
c.) The safety valves leaks: there is a risk of hot,
20 poisonous and aggressive medium.
20 d.) Other dangers caused by handling the safety
21 valves e.g., risk of injury from sharp edges,
21 heavy weight, ...
21
21 In order to minimise the risks of these hazards,
21 the operating instructions must be adhered to at
all times
21
21 recommendations below. The operating
21 instructions have been developed by practical
22 experience and from the requirements stipulated
22 in the regulations.
22 Sets of rules and standards:
• Pressure Vessel and Steam Boiler Ordinance
23 • TRD 421, 721
• TRB 403
23 • AD 2000-Merkblätter A2 and A4
• DIN EN ISO 4126
23
23 • Pressure Equipment Directive 97/23/EC
23 • ASME Code Section II and VIII
• API 526, 520, 527
23 • Others.
23
24 LESER is in possession of the appropriate
24 product-related certificates to prove that the sets
25 of rules and standards are fulfilled and that safety
25 is therefore guaranteed.
26
26 LESER is certified according to:
26 • DIN EN ISO 9001/2000 (Quality Management
26 System)
26 • DIN EN ISO 14001/2005 (Environmental Manage-
ment System)
• Modul D of the Pressure Equipment Directive
(quality assurance in production)
• ASME VIII (UV) and
• KTA 1401
This ensures that all requirements for quality and
environment are complied with.
3 Testing/marking
After setting and testing, each safety valve is
sealed by LESER or by the expert of an official
acceptance organisation at the customer's
request (such as TÜV, Germanischer Lloyd, ...).
If the marking of the safety valve is applied on the
valve body by means of a marking stamp, the
safety valve must not be damaged by such
stamping. Deformation of the valve may cause
leakage or destruction of the safety valve. Thin-
and given priority
E
over the
19