April 2021
Installation, Operation and Maintenance Manual
VA-DC-000-1952 Rev. 0
11
Section 2: Installation
Installation
2.8.2 Pipeline Gas connections – Refer to schematic 11547-S
a.
Locate Upstream Isolation Valve (90) and Downstream Isolation Valve (91) (optional)
for upstream and downstream pipeline gas connections, called out on the General
Arrangement Drawing and Hydraulic Schematic (see Figure 3).
b.
Close the Upstream Isolation Valve (90) and Downstream Isolation Valve (91)
(optional) remove the pipe plugs.
NOTE:
Connection to the Downstream Isolation Valve (91) is optional. The isolation valves NPT thread size
will vary based on actuator model size.
c.
Open Accumulator Hydraulic Isolation Valve (74) and Thermal Volume Controller
Hydraulic Isolation Valve (75).
d.
Connect the pipeline gas to isolation valves (90) and (91).
e.
Ensure the Pneumatic Blow Down Valve (87) is closed.
f.
Ensure Pneumatic Isolation Valve (Lockable) (83) is open.
g.
Slowly open isolation valves (90) and (91).
h.
Slowly open Pneumatic Blow-Down Valve (87) to purge the pneumatic side of the
control of air. Close valve (87).
NOTE:
The pneumatic side of the ECAT is pressurized and the isolation valves (90) and (91) should remain
open until maintenance of the ECAT is required.
Table 3.
Typical ECAT Accumulator System
Part Number
Part Name
74
Accumulator Hydraulic Isolation Valve
76
Accumulator (Piston Type)
75
Thermal Volume Controller Hydraulic Isolation Valve
77
Thermal Volume Controller
83
Pneumatic Isolation Valve (Lockable)
87
Pneumatic Blow-Down Valve
90
Upstream Isolation Valve
91
Downstream Isolation Valve (Optional)
