Fairbanks 2000 SERIES Rocker Column Railroad Scale - Manual (Page 9)

03/10 9 50614 Rev. 5
Ventilation: All scale pits shall be ventilated to meet the needs of each particular case to
minimize the relative humidity in the pit and to retard corrosion of scale parts and structural
steel.
Entrance to the Scale Pit: Suitable access to the Scale pit shall be provided. The entrance
shall be closed by a suitable closure fastened to prevent the entry of unauthorized persons.
Bearing Pressures Under Foundations: The bearing areas of the foundation footings
shall be such that the pressure under the footings will not exceed:
For fine sand and clay .................................. 4,000 lb. per square foot
For coarse sand or hard clay ....................... 6,000 LB per square foot
For boulders or solid rock ........................... 20,000 LB per square foot
If the soil does not have a bearing capacity of at least 4,000 lb.. Per square foot, and its bear-
ing capacity cannot be increased by drainage, stabilization, or other means, pile foundations
shall be provided. Careful soil exploration, including borings, is always desirable.
Leveling: Loadcell assemblies shall be raised or lowered, as required, by means of level-
ing screws, shims, or other methods to bring the weighbridge into level traversely and on
grade longitudinally. After leveling the loadcell baseplates, to a tolerance of not more than
0.015 inches per foot, they shall be grouted as required.
Scale House Design: Except where the indicating elements are mounted in a separate
building, a Scale house large enough to install, observe and service the indicating elements
shall be provided. It should have windows of sufficient size and so located as to give the
weigher an unobstructed view of the Scale deck and approaching cars or trucks.
Where a special scale house is required, a suitable and substantial building shall be provided.
To insure proper operation of the indicator and/or recorder, the house shall be equipped with
proper environmental control.
Scale House Location:
The lateral clearance between the Scale house and centerline of Scale or any track shall not
be less than 8 feet, unless otherwise required by law, or the serving railroad.
Indicator - Recorder Shelf: If a shelf is required for mounting the indicator and/or recorder, it
shall be so located as to provide for ease of operation without obscuring the weigher's view of
the Scale deck and approaching cars or trucks. The shelf must not limit ready access to the
instrument for maintenance purposes.