Generator construction Clause Samples
The "Generator construction" clause defines the requirements and responsibilities related to the building and installation of a generator within a project or contract. It typically outlines the standards to be followed, the timeline for construction, and the party responsible for providing materials, labor, and compliance with safety regulations. For example, it may specify that the contractor must ensure the generator is installed according to manufacturer specifications and local codes. The core function of this clause is to ensure that the generator is constructed safely, efficiently, and in accordance with all relevant standards, thereby minimizing risks and potential disputes over construction quality or responsibility.
Generator construction. 7.1.7.1 Stator
a) The Generator casing shall be designed:
i. To withstand an internal hydrogen explosion,
ii. To withstand the stresses associated with a full three-phase short circuit at the Generator terminals without distress,
iii. To be sufficiently rigid to preclude any distortion or deflection of the bearings taking place under all operating conditions,
iv. Not to distort or be damaged by double frequency vibrations transmitted from the inner core.
v. To withstand corrosive atmospheres.
vi. To accommodate a 100 mm pipe flange for emergency removal of H2 gas. A similar size vent line including the interface must also be installed from the casing to the roof.
b) The Generator casing is subjected to:
i. Quality control and test procedures during fabrication
ii. Each welder’s welding must be subjected to inspection and crack detection of 10% of all his welds
iii. Hydraulic pressure test, including end covers, of at least 1.5 times maximum working pressure for 30 minutes, witnessed by Eskom and an independent inspection authority appointed by Eskom.
iv. Gas pressure test after assembly at site, at least 1.1 times working gas pressure for 12 hours with an acceptable pressure drop of not more than 0.2% drop corrected to NTP.
c) It is also the Contractor’s responsibility for the overall tightness of the complete gas system and the generator.
d) Attention is given to the existing stator and rotor lengths, anchor bolt arrangement and civil foundation when the new Generators are designed.
e) However, if the cost of the generator can be substantially reduced by modification of the foundation, Eskom will consider such alternative proposals. The Contractor shall then provide documentation of successful modification/s to other foundations (if applicable), the cost of modifications to the foundation and complete details of the processes to be used and the schedule impact if the modification is undertaken.
f) The Generator stator core is designed and assembled in such a manner as to ensure that core vibrations during operation are kept within specified limits (see Schedule A).
g) The laminations in the core ends are double varnished and bonded together at least in the stepped portion.
h) The maximum RMS vibration transmitted from the stator casing to the foundations does not exceed the amplitude specified in Schedule A.
i) The design of the core assures that overheating of the stator core ends do not occur within all conditions of operation defined by the capability ...