R020932J1, Install Manual

Section I I I

Table 3-2: Hotwell (Open) and Deaerator Systems

DA ONLY

Customer Connections

Booster Pump(s)

Water Softener(s)

Blowdown Tank

Cooling Water Inlet

Safety Valve Out

BPR Outlet

PRV Inlet

Skid Type

Inlet Outlet Recirc Inlet Outlet Drain Inlet Outlet Vent

None

X X X X X X X X X X X X X

Condensate Skid

X

X X X X X X X X X X

Water Skid

X X

X X

X X X X

X X X X X X

Generator Skid

3.4 OPEN SYSTEM

(Refer to P&ID drawing R-19477.) In an open system, the makeup water, condensate returns (system and separator trap returns), chemi- cal treatment, and heating steam are blended in an atmospheric feedwater receiver tank, (vented to atmo- sphere - under no pressure). Open feedwater receiver systems are sized to provide the necessary volume of feedwater and sufficient retention time for the chemical treatment to react. Condensate, separator trap returns and feedwater treatment chemicals are injected at the opposite end of the tank as the feedwater outlet connection. This helps to avoid potential feedwater delivery problems to the booster or feedwater pump(s), and to provide sufficient reaction time for the chemical treatment. Installation guidelines for the feedwater receiver are provided below. Descriptions for the other water treatment and accessory components, shown in R-19477, are provided in Section VII (Optional Equip- ment) and/or in the Clayton Feedwater Treatment Manual.

NOTE All piping to and from the feedwater receiver must remain the same or larger size as the tank connection and not reduced. See Table 3-3 below for connec- tion requirements.

3-3

07/10/2015

Sect03_FeedwtrSys_SF_g.fm