15525
SECTION 15525
STEAM AND CONDENSATE SPECIALTIES
part 1 - GENERAL1.01 WORK INCLUDEDA. Steam Pressure Reducing
ValvesB. Condensate Return UnitsC. Steam TrapsD. Flash
Tank/SeparatorE. Drip Fan ElbowsF. Vacuum BreakersG. Air VentsH.
Moisture SeparatorsI. Sight GlassJ. Radiator ValvesK. Steam Flow
Meter(Vortex Meter)L. BTU Meter1.02 rELATED WORKA. Section 15410
Plumbing Piping and AppurtenancesB. Section 15240 - Sound and
Vibration ControlC. Section 15255 - InsulationD. Section 15520 -
Steam and Steam Condensate PipingE. Section 15545 - Chemical
(Water) Treatment1.03 REFERENCESA. SI/ASTM - Boilers and Pressure
Vessels Code. Section 8.B. ASTM A105 - Forgings, Carbon Steel, for
Piping Components.C. ASTM A126 - Gray Iron Castings for Valves,
Flanges and Pipe Fittings.D. ASTM A216 - Steel Casings, Carbon,
Suitable for Fusion Welding, for high Temperature Service.E. ASTM
A395 - Ferric Ductile Iron Pressure-Retaining Castings for Use at
Elevated Temperatures.F. ASME B31.9 - Building Services Piping.1.04
REGULATORY REQUIREMENTSA. Conform to ASME B31.9 - Building Services
Piping.B. Conform to Section 8D of the ANSI/ASME Boilers and
Pressure Vessels Code.
1.05 QUALITY ASSURANCE
A. Manufacturer: For each product specified, provide components
by same manufacturer throughout, who shall be a company
specializing in manufacture assembly and field performance of
products specified herein and pumps with minimum five years
experience.
1.06 suBMITTALSA. Submit product data under provisions of
Division 1 and Section 15010.B. Include product description, model,
dimensions, component sizes, rough-in requirements, service sizes,
and finishes, pump cures, NPSH curves, electrical requirements,
acoustic data, weight and access requirements.C. Submit schedule
indicating manufacturer, model number, size, location, rated
capacity, and features for each specialty.D. Submit manufacturer's
installation instructions.1.07 dELIVERY AND STORAGEA. Deliver
products to site and store and protect under provisions of Division
1 and Section 15010.PART 2 - PRODUCTS2.01 steam pressure reducing
valvesA. Provide steam pressure reducing valves as shown on
Drawings, complying with pressure ranges, capacities and
application arrangement.B. Valves shall be single-seat, pilot or
diagphragm-operated, and shall have cast iron bodies and approved
stainless steel seats and trimmings.C. Valve parts shall be
accessible for service without removal from line.D. Provide three
valve bypasses of capacity and range shown on Drawings. Each
pressure reducing valve shall be provided with T-type strainer and
blow-down valve on strainer.E. Valve shall be by Spence, Leslie,
Fisher, Spirax Sarco, or TLV.2.02 duplex CONDENSATE pump setA.
Provide condensate pump set of sizes and capacities and other
characteristics as scheduled on the Drawings.B. Set shall consist
of a complete assembly of two (2) electric motor driven centrifugal
pumps mounted with a receiver on a common base with all necessary
controls, interconnecting piping and wiring. Set shall be assembled
and factory tested as a unit.C. Pumps shall be 212F, 2 feet NPSH,
centrifugal vertical, submerged low suction, bolted to cast iron
base, vertically split cast iron casing, bronze impeller, stainless
steel shaft, grease lubricated ball bearings, mechanical shaft seal
suitable for 250F at 80 psig.D. Motor shall be drip proof, grease
lubricated ball bearings closecoupled to the pump.E. Receiver shall
be close grained cast iron (or minimum 3/16" steel)and elevated
from pump set with inlet, vent, drain, and required auxiliary
connections. Provide externally adjustable two-pole float switches,
water level gauge, dial thermometer, discharge pressure gauges,
bronze isolation valves between pumps and receiver, and lifting
eye-bolts. F. Provide and wire controls as follows in NEMA 4 panel
with hinged door and grounding lug:G. Two combination magnetic
starters with three overload relays apiece, with circuit breakers
and panel cover interlock;1. Electrical alternator. 2.
Automatic-Off selector switches, and momentary contact test
pushbutton.3. Numbered wiring terminal strip.4. Fusible control
circuit transformer for each circuit.5. Running lights, overload
reset buttons, alarm bell, alarm silencing switch, numbered and
wired terminal strip, auxiliary contacts for remote alarm
indication of high level alarm and auxiliary contacts for remote
indication of pump "status".6. Pump control circuits shall be
separate. Alternator shall change pump operating sequence
automatically after each cycle and cause simultaneous pupm
operation upon peak load. Back up pump shall operate automatically
upon failure of lead pump or control.7. Pump set shall be
manufactured by Aurora, Domestic ITT, or approved equal.2.03STEAM
TRAPSA. Acceptable Manufacturers:1. Spirax Sarco2. Armstrong3.
Hoffman4. Dunham BushB. Inverted bucket traps shall be cast iron
body and bolted cover for 250 psig WSP; provide access to internal
parts without disturbing piping; with top test plug and bottom
drain plugs, stainless steel bucket, stainless steel seats and
plungers, and stainless steel level mechanism with knife edge
operating surfaces, integral inlet strainer of stainless steel,
integral check valve.C. Continuous float and thermostatic traps
shall be cast iron body and bolted cover for 250 psig WSP; provide
access to internal parts without disturbing piping; with bottom
drain plug, stainless steel or bronze bellows type air vent,
stainless steel float, stainless steel lever and valve assembly.D.
Thermostatic traps shall have brass bodies and caps with natural
brass finish. Bellows, valve head and renewable valve seat shall be
stainless steel.E. Thermodynamic traps shall be disc type with
universal swivel connector, steel or cast steel construction.STEAM
TRAP SCHEDULE:
Type
Service
Sizing @ 1/4 PSID
Inverted Bucket
Steam header, Steam mains, Branch lines into gravity
returns.
Header:3 to5 times the condensate carryover rating (typically
10%)
Mains and Branch: 2 to 3 times the startup load due to radiation
losses.
Float and Thermostatic
Unit heaters, Converters, Heating coils, Flash tanks/
Separators, Humidifiers, Jacketed or Direct steam injected
equipment.
Equipment: 3 times the equipment rating.
Thermostatic
Steam radiation units, Convectors, and other similar terminal
heating units
Thermodynamic
High-pressure drips into pumped returns
Notes:
Steam traps for clean steam shall be 316 stainless steel
thermodynamic traps.
2.04VERtical flash tank / SEPARATOR WITH AFTERCOOLERA. Provide
flash recovery vessel by Spirax Sarco or flash seperator by Penn
Separator. Vessel shall be mild dteel construction with ANSI 150
flanges and ASME Code stamped for 150 psig staem working pressure
and 500F working temperature. Separator to have 3/8 stainless steel
striking plate at point of inlet impingement . Provide safety
relief valve equal to the user steam pressure plus 10% for high
pressure steam users and no greater than 15 psig for low pressure
steam users. Pipe to safe area outdoors. Insulate relief pipe.B.
Separator shall be furnished with three angle legs for floor
mounting.C. Provide after cooler for automatic control of drain
temperature.2.05 DRIP PAN ELBOWSA. Acceptable Manufactures:1.
Spirax Sarco2. Armstrong3. Hoffman4. Or equalB. Discharge elbow and
drip pan for safety valves. NPT for 2 inches and smaller, flanged
for 2-1/2 inches to 8 inches. Full size of safety valve outlet
size.2.06 VACUUM BREAKERSA. Vacuum Breakers shall be used on all
modulating or on/off exchangers and coils, except in vacuum return
systems. They shall be installed in the supply side between the
control valve and equipment and be of hardened ball check valve
design with all working parts depending on the application, and
shall be suitable for operating conditions of 210 PSIG saturated
steam. 2.07 AIR VENTSA. Air Vents shall be installed at the end of
all steam headers, and on large equipment steam spaces to
facilitate startup and heat transfer. They shall be self-adjusting
balanced pressure thermostatic type with precision welded multiple
plate stainless steel bellows. Head shall be hardened and both head
and seat shall be stainless steel. Body and bolted cap shall be
cast iron and internals shall be renewable.2.08 MOISTURE
SEPARATORSA. Moisture Separators shall be provided to improve
quality of steam ahead of steam humidifiers and as shown on the
drawings. They shall be of the high efficiency, internal baffle
type having a pressure drop that does not exceed an equivalent
length of pipe. Bodies for pressures to 200PSIG steam can be made
of either cast iron or steel with screwed or flanged connections.
For pressures to 300 PSIG steam, the bodies shall be steel or 316L
grade stainless steel and flanged to ANSI 300. A screwed bottom
drain is required on all units for drainage. 2.09 SIGHT GLASSA.
Provide visual checking of steam trap operation. Sight glass shall
be single/double type having brass bodies with screwed connections
and removable toughened glass windows.2.010 RADIATOR VALVESA.
Radiator valves shall be provided at inlet to equipment for
shut-off of steam/water supply. They shall be low profile type,
packless with non-rising stem, wheel handle and bronze body
configuration to meet piping connections indicated on the drawings.
Valves shall be rated for 150 PSIG SWG, 200 PSIG WOG. 2.011 STEAM
flow meter (Vortex flow meter)A. Provide a vortex flow meter to
measure fluid flow with 1 % accuracy over a 20 to 1 flow range.
Provide for recording pressure, flow rate and integrator for total
flow. Installation shall be as per manufacturer,s recommendation.B.
All components shall be by a single manufacturer: Engineering
Measurements Company, Fisher and Porter or approved equal. The
components shall be as follows:1. Vortex Flow Meter2. Fluid Type:
Steam3. Pressure ratings:ANSI 1504. Meter quantity: 25. Meter
Size:6 inch diameter flange connection6. Flow range @ 100 psi.7.
All wetted parts shall be stainless steel construction.8. Enclosure
shall be NEMA 4 design.9. Power shall be 18 to 40 Volts DC.10.
Analog output shall be 4-20 mA, 2 wire or frequency output.11.
Meter can be installed at any angle.12. Industrial Pressure
Transmitter13. Opertaing pressure range: 0 to 150 psig.14. Power
shall be 9-30 volts DC. Output shall be 4-20 mA, 2 wire
configuration.15. Isolating digphragm 16. Transducer body shall be
316 SS with NPT female.17. Provide with mounting kit siphon tube
for operating temperatures in excess of 250F.18. Flow
Processor/Remote termibal Unit19. Remote unit shall be NEMA 4
design.20. Relay output shall be DC.21. Analog output shall be
4-20mA.22. Frequency flow input.2.12 BTU METERSA. Provide
electronic Btu meters in locations and of sizes shown on
Drawings.B. Recovered condensate meter shall be designed for
minimum temperature range of 40F to 225F.C. Control panel shall
have readouts for BTUs and total gallons.D. Counters shall be
non-resettable and shall retain readings if power to the unit is
interrupted.E. System shall operate with as little as 1F
temperature difference, and as much as 170F temperature difference,
between two thermistor sensors, accurate to 975 or more over entire
range.
PART 3 - EXECUTION
3.01 iNSTALLATION AND APPLICATIONA. Install specialties in
accordance with manufacturer's instructions.B. Provide steam trap
assembly at all low points of steam piping, at bottom of all steam
risers and drops and at each piece of equipment, separately,
whether or not indicated on drawings.C. Provide dirt pocket, gate
valve, strainer and union at inlet, and union, gate valve and check
valve at discharge of steam traps. Provide minimum 15 inch long
dirt pocket of same pipe sizes as apparatus return connection
between apparatus and steam trap, 8 inches long dirt pocket below
inlet connection to steam trap. Provide blowoff valve at all dirt
pockets whether indicated or not.D. Pipe outlet from coils to drip
leg. From drip leg, install appropriate trap, sized at three times
the condensate load of equipment, at 1/4-psig differential.E. Traps
used on steam mains and branches shall be minimum 3/4-inch size.
Install steam traps with union or flanged connections at both
ends.F. Install traps and control valves in accessible locations as
close as possible to equipment. Maximum allowable distance from
equipment 4 feet.G. Install full size bypass piping with globe
valve around control valve. Where multiple, parallel control valves
are installed, only one bypass is required.H. Install globe valves
so that the pressure is below the disk. Install globe valves with
the stems horizontal on steam and exhaust lines.I. Remove
thermostatic elements from steam traps during temporary and trial
usage, and until system has been operated and dirt pockets cleaned
of sediment and scale.J. Install vacuum breaker downstream from
control valve and bypass, as close as possible to the coil inlet
connection.K. Install pressure gages at equipment inlet steam
connection.L. Pressure Gages: Install cock between each pressure
gage and the pipe; provide siphon "pigtail" ahead of gage at gages
on steam lines.3.02SAFETY VALVE INSTALLATIONSA. Install relief
valves in accordance with and where required by ASME B31.1-"Power
Piping". Pipe discharge to atmosphere outside building, without
stop valves. Terminate vent pipe with screened vent cap, at an
approved location to dispose of the discharge without injury to
personnel or damage to equipment and premises.B. Install drip pan
elbow fitting adjacent to safety valve. Pipe drip pan elbow drain
connection to over nearest floor drain without valves. Comply with
ASME Boiler and Pressure Vessel Code for installation
requirements.C. Rate relief valves for pressure upstream of
pressure reducing station, for full operating capacity. Set relief
at maximum 20 percent above reduced pressure.D. Provide access
space around all pumps for servicing; install all condensate units
in accordance with the manufacturers requirements; decrease from
line size with long radius reducing elbows or reduces. Support
piping adjacent to the pump such that no weight is carried on pump
casings.3.03TESTINGA. Test steam traps for proper performance.B.
Ensure minimum steam loss when strainers are cleaned.C. Use steam
traps installed at high points to release trapped air while
filling. Use drip legs installed at low points for complete removal
of liquid used for testing.
END OF SECTION
Burj Dubai Dubai Mall Hotel, Dubai, United Arab EmiratesSteam
and Condensate Specialities
MEP Spec-For Construction (Date of Issue: 2006)15525.2
