System Recommendations (Continued) - TCS 700-30 Installation, Operation & Maintenence Manual

System Recommendations (Continued)

Thermal Shock
The system operating temperature will expand or contract the metals within the flow meter. For systems that have
sudden or immediate temperature increases of 68 F (20 C) degrees or more, will require clearance rotors.
Clearance rotors will be necessary to eliminate the effect of immediate expansion of the rotors vs. meter
body, caused by thermal shock.
Hydraulic Shock (Water Hammer)
Hydraulic shock is a rise in pressure, which happens when an operating system has immediate change in
direction of flow such as a fast valve closure at a high operating flow rate. Hydraulic shock can damage
any item in the way of the product flow such as internal parts of the meter, valves, and pump. System de-
sign and improper operating procedures will elevate this problem. The use of 2-stage preset control
valves or surge suppressing bladders or risers will help reduce or eliminate this problem.
To compute the shock pressure when a valve is closed quickly (recommended to be less than 6 PSI):
In order to eliminate hydraulic shock, you need to slow down the valve closure rate. The time required to
close the valve so that the line pressure will not exceed the normal pressure at no flow is:
V = Velocity in Feet/Seconds
L = Length of pipe before the valve in feet
N = Line pressure at no flow
F = Line pressure at full flow
Products that Dry/Congeal/Crystallize
There are many liquids that crystallize, harden and/or solidify on contact with air or with an increase in
temperature. A proper system design and a good understanding of the product being measured will help
to avoid the possibility of air entering into the system and the product being affected.
Calibration
The meter shall be tested and calibrated with the product it is intended to measure when installed. Total
Control Systems shall not be responsible for loss of product or any damages resulting from the end user's
failure to test this meter to insure proper calibration. Every 700 series meter is tested and calibrated at the
factory to prove it is calibratable in your system. It is the owner's responsibility to report this device to
the local Weights and Measures officials for their inspection before the meter is put to use.
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Shock Pressure (PSI) = 63 x Velocity (FPS)
Time (seconds) = 0.027 x L x V
N – F