11. APPENDIX I
PULSALARM LEAK DETECTION SYSTEM
11.1 PULSALARM LEAK DETECTION REAGENT HEAD
ASSEMBLY
The PULSAlarm leak detection reagent head assembly consists of reagent head, leak detection
diaphragm, suction and discharge check valves, and pressure switch and gauge. The reagent
head, diaphragm, suction and discharge check valves are the only parts of the pump to contact
the process liquid; consequently, maintenance is critical to pump performance
Figure 24
A sealed system must be maintained at all times during pump operation, whether leak
detection is required or not. Under normal operation, the pressure gauge should read
zero PSIG.
11.2 PULSAlarm Leak Detection Diaphragm
Double, or sandwiched, TFE diaphragms are sealed at their peripheries to an intermediate
metal spacer ring. The space between the diaphragms is sealed so that the diaphragm
functions as does a standard single diaphragm. With the pressure system, the space between
the diaphragms is filled with a small amount of fluid. At startup, any excess fluid in the system is
expelled through the check valve, and then the system is capped and sealed. The fluid as
supplied from the factory is a silicone-based oil, but an alternate fluid can be used if
compatibility with the materials of construction is verified. This space is connected to an
adjustable electrical switch (optional) that actuates in response to a buildup of pressure resulting
from rupture of either or both diaphragms. Switch operation can be used to perform any
external function, typically to signal an alarm or turn off the pump. For component location refer
to Figure26.
PULSAlarm leak detection utilizes a pressure detection system. Always ensure that you
are following the procedure correct for your system.
To Next Page
Loading...
Need help?
General
