Designs, materials, weights and performance ratings
are approximate and subject to change without notice.
Visit
armstrong
international.com for up-to-date information.
Armstrong
International
221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
Tel. (269) 279-3602 Fax. (269) 279-3130
Page 11 of 44
Installation – continued
Steam Piping Installation:
1. Install the Digital-Flo
®
with adequate room to allow for tube bundle removal when cleaning is required. See Table 12-1
for specific dimensions.
2. If 2-15 psig of steam is available a pressure reducing valve is NOT required. If a pressure reducing valve is required, an
Armstrong Inverted Bucket Steam Trap is recommended to drain condensate at the inlet of the pressure reducing valve.
3. An Armstrong Y-strainer should be installed before the pressure reducing valve to reduce the chance of dirt fouling.
4. If an externally piloted pressure reducing valve is used, the control pipe should be pitched away from the PRV and
installed at the pressure gauge on the shell of the heat exchanger.
5. A steam safety relief valve should be used prior to the heat exchanger if either or both of the following conditions exist.
(1) If the maximum steam pressure could exceed the minimum water pressure in the tubes, or (2) The maximum steam
pressure could exceed 150 psig (the maximum steam pressure rating of the shell).
IMPORTANT -Steam supply pipe size coming to the heat exchanger should NOT be smaller than the steam connection
supplied on the heater, otherwise steam flow could be restricted. If a pressure reducing valve is used, installation
should be as close as possible to the Digital-Flo
®
. Downstream piping from the Pressure Reducing Valve should be
expanded immediately after the PRV to accommodate the expanded volume of steam.
6. To vent start-up air, an Armstrong Thermostatic Air Vent is included and installed on the top connection, opposite the
trap drain connection of the heat exchanger. This discharge can be piped to drain or the floor if preferred.
7. Install a suitable steam pressure gauge in the 1/4” coupler located in the top mid section of the heat exchanger shell.
This gauge will help diagnose pressure problems should they occur. This port may also be used for a PRV external
control pipe if a PRV is required.
Typical installation shown. Always consult local codes and standards for detailed installation requirements.
NOTE:
Digital-Flo
®
assembly is provided with (1) Armstrong Steam Trap, (1) Vacuum Breaker (1) Safety Relief Valve, and
(1) Thermostatic Air Vent. All other items shown in gray not included.
Summary of Contents for Digital-Flo DF41540
Page 45: ...Notes...
