# INSTALLATION AND OPERATION MANUAL FOR TECJET 52 GAS REGULATI Caterpillar

Chapter 4. Valve Sizing

## Usage:

Figures 4-1 through 4-4 show the maximum and minimum amounts of gas that the TecJetTM 52 will flow as a function of pressure differential in kPa(d). Figures 4-1 and 4-2 indicate flow values for specialty gas, while Figures 4-3 and 4-4 indicate flow values for natural gas. Plots for the TecJet 110 and the TecJet 50 plus are also shown for comparison purposes.

## Comparing the TecJet 52 vs Application Maximum Flow Rate

Choose the correct graph depending on your application flow media. Determine the maximum flow rate for your application in a metric mass flow rate (kg/h). Increase this value by 15% to ensure that the TecJet 52 will handle the maximum flow requirement under all conditions. Find this increased flow value on the left side Y-axis of the graph. Next, determine the approximate valve pressure drop at the actual maximum flow for your application. Locate this value on the X-axis of the graph. Metric [kPa(d)] units are provided. Note that the graphs assume the application outlet pressure is at sea level atmospheric pressure. Take the increased flow rate value and the pressure drop value, and determine where they cross on the graph. This is the maximum flow operating point for your application. This point should fall below the maximum flow plot for the valve in question.

## Comparing the TecJet 52 vs Application Minimum Flow Rate

Choose the correct graph depending on your application flow media. Determine the minimum flow rate for your application in a metric mass flow rate (kg/h). Reduce this value by 10% to ensure that the TecJet 52 will handle the minimum flow requirement under all conditions. Find this reduced flow value on the right side Y-axis of the graph. Next, determine the approximate valve pressure drop at the actual minimum flow for your application. Locate this value on the X-axis of the graph. Metric [kPa(d)] units are provided. Note that the graphs assume the application outlet pressure is at sea level atmospheric pressure. Take the reduced flow rate value and the pressure drop value, and determine where they cross on the graph. This is the minimum flow operating point for your application. This point should fall above the minimum flow plot for the valve in question.

Figure 4-1. Maximum Specialty Gas Flow Capacity of TecJet 52, 50 Plus, Precision Flow, 50, and 110 (Specialty Gas, SG=1, Sea Level)

Figure 4-2. Minimum Specialty Gas Flow Capacity of TecJet 52, 50 Plus, Precision Flow, 50, and 110 (Specialty Gas, SG=1, Sea Level)

Figure 4-3. Maximum Natural Gas Flow Capacity of TecJet 52, 50 Plus, Precision Flow, 50, and 110 (Natural Gas, SG=0.6, Sea Level)

Figure 4-4. Minimum Natural Gas Flow Capacity of TecJet 52, 50 Plus, Precision Flow, 50, and 110 (Natural Gas, SG=0.6, Sea Level)