Emerson YARWAY 516 Series, YARWAY 515 Series Installation, Operation And Maintenance Instructions
YARWAY SERIES 515/516* INTEGRAL STRAINER STEAM TRAPS
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
Before installation these instructions must be fully read and understood
RATINGS
Operating pressure ranges
MAX. TEMPERATURE (C)
SATURATION CURVE
ALL LIQUID
PHASE
SERIES 515
ALL
SUPERHEAT
MAX. TEMPERATURE, PSI
SERIES 516
MAX. TEMPERATURE, BAR
MAX. TEMPERATURE (F)
SHELL PRESSURE/TEMPERATURE RATINGS
Back Pressure Limits
SERIES NUMBERS
Piston valve traps rated to 1500 psig (100 bar)
(incl.) are factory set to operate from 150psig
(10 bar) to maximum rated pressure. Maximum
allowable back pressure at trap outlet equals
To determine the size, series number, and
pressure/temperature rating, refer to the
nameplate on the trap body.
25% of pressure at trap inlet, based on absolute
pressures.
Suffix Letter Identification
SW Socketweld ends
A, B Internal Part Size
R* Commercial (flanges per ANSI Standard)
E* Navy (flanges per MIL-T-960E)
End Conn. Figure No. Internal Parts Piston End Conn. Rating
1/2", 3/4", 1"
Note: Series 515 socketweld end traps are chrome moly steel construction.
*Series 516 socketweld end traps are constructed from carbon steel.
515
516*
A or B
SW
SW
1500 psig (100 bar) - 875F (468C)
1500 psig (100 bar) - 775F (413C)
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YARWAY SERIES 515/516* INTEGRAL STRAINER STEAM TRAPS
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
FIGURE 1
Equipment drain
Yarway Welbond shut off valve
Steam trap
Dirt leg
(optional)
Strainer blow-down (optional)
½ Yarway Welbond globe valve
Test valve (optional)
Yarway Welbond globe valve
INSTALLATION
Piping to and from the trap should be equal to
trap size or one size larger. Discharge line for
short runs equal to trap size; larger for long
runs. Avoid configurations that would cause
excessive back pressure.
Blow the System Out before installing the trap.
Frequent strainer blowdown or cleaning is
recommended on a new system. Conditions
will dictate frequency of blowdown in normal
operation.
Elevated return
Check valve
Return main
Welding - Socket or seal welding of this
trap body to the piping should be completed
according to applicable codes, standards, and
procedures.
DO NOT make electrical welding connections
to the trap body or any other part of the trap
to prevent internal arcing. Electrical ground
should be made to the pipe and not the trap.
Note: It is not necessary to disassemble the
trap prior to welding, but avoid subjecting the
internals to temperatures higher than 500F.
Valves - Use globe type (Yarway Welbond
®
) for
isolation strainer blow down, or for test (see
Figure No. 1). Bypasses not recommended
except for critical installations. If discharge
is to a multistation or overhead return, put a
swing check valve in discharge line to prevent
backflooding on shutdown. Select a check valve
suitable for the application.
Locate Trap below outlet from equipment
(gravity flow). If trap must be above the drain
provide a "U" or lift fitting at the bottom of the
riser before the trap (water seal). The trap may
be installed in a horizontal or vertical line or at
any angle so long as the discharge is downward
or horizontal.
WARNING
Hot discharge from this product may cause severe
burns. Discharge must be piped away or directed
so that persons in the vicinity are not endangered.
This product must be isolated, vented and cool to
the touch before repairing or inspecting.
2
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