TECHNICAL SPECIFICATIONS - LISEGA

10.2 Spring relaxation
Conventional helical coil springs under load,
depending on time and temperature factors,
lose part of their tension by relaxation (settling
loss), a loss that is not inconsiderable.
If no appropriate measures are taken, for
constant and spring hangers this can in the
long run lead to a reduction in adjusted ultimate
load of more than 10%.
In contrast to common practice, LISEGA only
uses springs that, through special treatment,
permit no settling loss of any significance.
In these springs the settling loss normally to
be expected is anticipated via the process of
hot setting from a longer coil length, producing
corresponding prerelaxation.
Relaxation
Shear stress
Relaxation behavior of helical coil springs
Cold set helical coil springs
(values loosely based on DIN 2089)
LISEGA hot set helical coil springs
qualified by TÜV and VGB suitability tests
(independent German authorities)
11. QUALITY ASSURANCE
11.1 Fundamentals
Superior product quality has an important place
among the fundamental company goals at
LISEGA and also involves the activities of
and relationships with our business partners.
The organization and attitudes of those working
in the company are correspondingly attuned
to this aim. In a quality management
program (QMP), special quality-assuring
measures are prescribed. They are an integral
part of order processing and embrace the
whole LISEGA group.
11.2 Quality management program, QMP
The QMP is clearly laid out in a quality management
manual, QMM, and regulates all the
quality-assuring activities in the company.
The QMM covers the organization as a whole,
whereby the observance of rules is monitored
by the independent quality management department
QM. The QMM has been compiled
according to international quality norms and
standards and specifically takes into account
the regulations according to ASME III - NCA
3800 and NCA 4000 incl. NF as well as DIN
EN ISO 9001 and KTA 1401.
The QMM applies in principle to both the conventional
and nuclear fields. The extent of
monitoring of materials and tests, as well as
the documentation, can in each case be
exactly adapted to special requirements by the
use of extended QA levels. All international
requirements concerning nuclear applications
can be covered. Corresponding qualifications
are available and are regularly renewed.
11.3 International qualifications
Certification code
DIN/EN/ISO 9001
DIN/EN/ISO 9001
ASME-III NCA 4000/NF
(NPT-Stamp)
ASME-III NCA 3800/NF
Stamping agreement
AD-Merkblatt HP 0; HP 3; HP 4
Welding certification according to EN 729-2
DIN 18800T7
Major qualification certificate
ASME III - NCA/NF; ASME IX
SKIFS 1994:1
ASME-III NF/NCA 3800;
10CFR50 App. B; 10CFR21;
N45.2; NQA1
Certification No.
Reg.Nr. 200550
1996/5030
N-2951
QSC 552
0121WO29784
07-702-0194
07-703-0080
60317/62/9804
No. 1606
No. DNV 5477
CEXO-99/00210
0
QMP and Processing
constitute a single entity!
Certifying body
Lloyd’s Register QA
L’AFAQ
ASME Accreditation and
Certification
ASME Accreditation and
Certification
TÜV Nord e.V.
(independent German
authority)
SLV-Hannover
TRACTEBEL (Vincotte)
DET NORSKE VERITAS
NUPIC
0.14