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845.778.5566 ● Fax: 845.778.7123 ●
www.nicholsonsteamtrap.com
The Nicholson Drain Orifice Trap is an
engineered, continuous flow device. The
controlling element in the Drain Orifice
Assembly is a flat S.S. plate, 1/4" thick. Drain
Orifices discharge air, condensate and all other
non-condensible gases with minimal live steam
loss. The fixed orifice size is calculated, for a
given application, to discharge the condensate
load at a maximum thermal efficiency.
Approximately 10-25% of discharging hot
condensate flashes to steam at the downstream
side of the orifice, at a constant pressure drop.
This flashing effect further restricts the flow of
saturated steam. In actual conditions, a minimum
percentage of steam, by weight, is discharged with
condensate, since the specific volume of steam is large
compared to that of the condensate. The velocity
through the orifice is highly turbulent. The initial calculated steam loss can be expected to remain relatively
constant over the expected 10+ years trap life. The major
factor for energy efficient performance is based on initial
orifice sizing for the application. Properly sized, thermal
efficiencies of 98%+ can be attained. The Drain Orifice
Trap is ideally suited for use on high pressure steam
(saturated or superheated) from 600 PSIG to 2500 PSIG
with minimum steam loss, zero maintenance and long
service life.
TYPE DFA
DRAIN ORIFICE
STEAM TRAP
Pressures To 2500 PSIG (172 barg)
Temperatures to 750°F (400°C)
MAINTENANCE
BENEFITS
●
Typical service life exceeds 10 years.
●Zero maintenance costs over the service life of the
Orifice.
●No moving parts offers maintenance free operation
when properly installed.
●Low spare parts inventory.
●Easy to install.
ENERGY SAVING BENEFITS
●
Design factor results in reduced initial steam loss.
●Fuel savings to 50% achieved in applications during
past 10 years.
●Maintains low rate of steam loss over entire service life.
●Cannot fail open, eliminating large steam losses.
O
PERATING BENEFITS
●
Accommodates varying condensate loads created by
modulating pressures.
●Freeze proof.
●Resists thermal and hydraulic shock.
●Reduces make-up water to boiler and water chemical
treatment costs.
●Maintains constant pressure to condensate return
systems.
●Meets dimensional requirements of MS 18301
Specifications.
MODELS
●
DFA–Drain Orifice Trap with gaskets and inlet screen.
●DFR–Replacement gasket kit including inlet screen.
APPLICA TIONS
●
Pressure Reduction
●Ratio of Flow-mixing two or more fluids at
fixed ratio
●Fixed Flow-i.e. gland seal recirculation of
cooling water on pumps, compressors,
process analyzers, etc.
●Intermittent Drainage-i.e. air tools, air storage
tanks, cleaning fixtures, air vents, etc.
●Cryogenic Storage Venting
●Low Pressure Blanking
●Sampling of process fluids at a fixed flow rate
for use with Instrument Analyzers
Canadian Registration # 0E0591.9
O
PERATION
845.778.5566 ● Fax: 845.778.7123 ●
www.nicholsonsteamtrap.com
65
Connections: 1/2" – 2" Wafer Style
ANSI 150#, 600#, 1500# & 2500#
TYPE DFA
DRAIN ORIFICE
STEAM TRAP
SPECIFICATION
Orifice Drain shall comply with dimensional requirements of
MILSPEC MS 18301 and consist of 1/4" 304 stainless orifice
plate fixed between user supplied flanges. It shall be sealed by
spiral wound gaskets. Inlet gasket shall be modified with a
stainless steel mesh strainer affixed across the inside diameter.
Orifice shall be sized for the application to a minimum of 0.020".
MAXIMUM
OPERA TING CONDITIONS
PMO: Max. Operating Pressure 2500 psig (172 barg)
TMO: Max. Operating Temperature 750°F (400°C)
PMA: Max. Allowable Pressure 2500 psig (172 barg)
TMA: Max. Allowable Temperature 750°F (400°C)
MATERIALS OF CONSTRUCTION
Inlet Gasket ……………Spiral-wound 347 S.S./Graphite
……………………w/S.S. 60 mesh dome strainer insert
Orifice Plate …………………………304 S.S., 1/4" thick
Outlet Gasket …………Spiral-wound 347 S.S./Graphite
Customer to supply ANSI B16.5 flanges.
S
IZING*
Consult Factory–required information:
Condensate Load ______
Inlet Pressure ______
Outlet Pressure ______
Elevation of return line over trap (if any) ______
* Specify orifice size when ordering .
Dimensions
Pipe
Min. Pipe Min.
Size NPT
Bore (in.)* Orifice
1/2" 9/16 .020
3/4" 3/4 .020
1" 7/8 .020
1 1/4" N/A .020
1 1/2" N/A .020
2" N/A .020
* Dome strainer used for sizes up to 1".
Flat strainer used for larger sizes.
5/8
1/2
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