Issue
A
Prepared by:
DLS
Date
11/01/11
Approved by:
MRM
Technical Manual
Number: 0000007019
Operational Calculations The chart on the previous page depicts typical working flow rate values for a 3.0� HEST. The chart is read by finding the point where the operating (black) line intersects with the orifice size being used and reading across to see the estimated flow rate required to run the HEST. These charts change with different key sizes, fluid viscosity, temperature, etc so should only be used as a rough guide. This is an approximate guideline only, prior to every job, it is recommended to follow the procedures below. 1. With the gauge ring around the HEST, start and increase the pump rate until the keys are fully inflated and the gauge ring is secure but still free to move, record this pump rate in the box provided. 2. Continue increasing the pump rate until the keys over expand and lock the gauge ring solid, record this pump rate in the box provided. Inflation pump rate
Maximum pump rate
BBL/min
BBL/min
3. To work out the optimal running pump rate use the equation. Running pump rate = inflation pump rate + [(maximum pump rate - inflation pump rate)/4]. Enter the running pump rate in the box below Running pump rate BBL/min For example: 5mm Orifice Inflation pump rate
Maximum pump rate
.07 BBL/min
0.32 BBL/min
Recommended running pump rate = inflation pump rate + [(maximum pump rate - inflation pump rate)/4]. = 0.07+(0.32-0.7)/4 = 0.13 BBL/min Running pump rate 0.13 BBL/min
7 Š
2010
T18 issue 1