Hardy HI 1769-FC - Manual (Page 65)

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Chapter 7
1) Keep flexures on the horizontal
2) Vertical flexures should be avoided
3) Do not use flexures to correct for misaligned piping
4) Do not use hose flexures to make right angle bends
5) Non-flexed piping should have an unsupported
horizontal run using a ratio of 36 times it’s diameter
6) Pipe flexure lengths should be a ratio of 6 times it’s diameter
7) Feed and discharge piping flexed
8) Are the flex joints on the correct side of the valve?
H
(a) You weigh the output valve, not the input valve
(b) Does the weight scale see all the product to be
weighed?
(c) If the product applies a force to a valve or pipe, that
pipe or valve must be included in the weight vessel.
(d) Proper position of the flexures are key
(e) Your vessel must seem to float.
H1
All pipes and conduits
flexible
H2
Mechanically isolated
from ladders and
connecting structures?
1) Floors or structure does not interact
2) Local traffic does not interact
3) Protected from forklifts and adjacent processing
equipment.
H3
Are the load cells
properly mounted?
1) Level, solid mounting base
2) The load cell is mounted right side up
3) All load cell bolts installed using anti-seize compounds
4) Mechanically aligned to compensate for expansion and
contraction
H4
Are check rods
installed to dampen
vessel movement?
1) Protects the load cells from overload and impact forces
2) Limits the movement of the vessel
3) Rods must be loose and not interact with the vessel
H5
Are cables routed
properly?
1) Separate conduit for low and high voltage cables
2) Do not bundle low voltage with high voltage cables
3) Maintain at least 3 inches of separation
4) Maintain 14” separation from magnetic fields and 440 VAC
5) Cables are in conduit or tied up and protected from damage
H6 Housekeeping
1) Product, tools and production aids are off the vessel.
2) No workers are physically on the scale
3) Must protect equipment from environmental damage
4) Insure openings are sealed to keep water and environmental
contaminates from damaging
(a) Instrument cabinet or enclosure
(b) Summing card
(c) Load Cells
(d) Conduit runs
(e) Covers properly installed
To
Verify Electrical
go to
J