HomeMy WebLinkAboutB18-0066_17.M4.0_1523647552.pdfGeneral
1. Immediately notify the engineer of any discrepancies.
2. Do not scale drawings. Verify dimensions in field prior to commencement of work.
3. It is the intent of these drawings and specifications to establish a standard of quality. The engineer reserves the
right to take exceptions to approve methods and materials not reflected herein.
4. Failure to order, or release order, for materials and/or equipment will not be accepted as a reason to substitute
alternate materials, equipment, or installation methods.
5. Work shall be performed in a workmanlike manner to the satisfaction of the engineers.
6. Labor, materials, and equipment shall conform to the latest applicable editions of local, State of Colorado, and
National Codes and ordinances. If conflict between those publications exists, the most stringent requirement shall
apply.
7. Provide record drawings to owners representative. Drawings shall include all splice locations, addendum items,
change orders, alterations, re-routings, etc.
8. The drawings show the intent of the mechanical systems but do not show all details required. It is the
responsibility of the contractors to install complete & operable systems, which conform to the manufacturers'
installations instructions & industry standards.
9. Systems shall be tested for proper operation. If tests show work is defective, contractor shall make corrections
necessary at no cost to owner. Workmanship warranty shall be for two years unless noted otherwise. see BC & E
project manual for additional information.
10. It is the contractors' and manufacturers' responsibility to assure themselves that the code authorities will approve
any product to be installed on the project.
11. Provide necessary trenching, backfill, excavation, supports, piping, insulation, saw cutting and patching,
concrete/paving, etc., as required.
12. Systems shall be professionally labeled. Piping shall be labeled with color coded commercial grade labels
indicating piping service and flow direction. Equipment, pumps and valves shall be labeled with engraved plastic
or metal tags and an equipment/valve schedule shall be provided and mounted on the mechanical room wall.
Equipment labels shall follow the same nomenclature as the mechanical drawings.
13. Coordinate civil, membrane repair, and landscaping drawings with mechanical drawings prior to installation.
14. Offset piping, ductwork, etc. as necessary to accommodate structure, beams, columns, and existing equipment.
15. Verify exact locations of existing and new underground utilities, piping, and raceway systems prior to
construction. Contractor shall obtain and verify exact utility company drawings and requirements.
16. Contractor must carefully verify electrical service voltage and phase available before ordering any equipment.
17. The mechanical contractor shall field verify all existing conditions prior to bidding. Contractor shall also verify all
existing equipment and controls to be reused are in workable condition and are suitable for reuse.
Shop Drawings
18. Submit entire mechanical and plumbing shop drawing submittal data at one time. Submittal to be bound in
three-ring binders, indexed in a neat and orderly manner. Partial submittals will not be accepted. Submittals shall
include, but not be limited to: equipment, insulation, pumps, piping, valves, boilers, and equipment accessories.
Renovation & Unforeseen Conditions
19. In as much as design for renovation and/or rehabilitation requires that certain assumptions be made regarding
existing conditions and because some of these assumptions cannot be verified without destroying otherwise
adequate or serviceable portions of the building or property, the Engineer cannot assure the Owner or the
Contractor that the professional consulting services herein encompass all contingencies. Field coordination during
construction is imperative. Contractors bidding this work must make reasonable allowances for unforeseen
conditions and should include associated allowances in their bids noted as such.
Insulation
20. Snowmelt distribution piping INSIDE shall be insulated with U.L. approved, white, all service, glass fiber,
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21. Snowmelt distribution piping BURIED OUTSIDE shall be A) pre-insulated PEX piping, Uponor, Urecon or
equivalant or B) with 1" flexible, closed-cell elastomeric insulation, AP Armaflex or equal. Product must meet
requirements of ASTM C 534. Insulation shall have a maximum thermal conductivity of 0.27 Btu-in/h-ft2F at 75
F mean temperature. Buried insulation shall be sleeved in PVC or wrapped in a waterproof tape, e.g. Densotape or
approved equal.
22. Insulation for all types of piping shall be carried full size through pipe hangers or pipes shall be supported with
vibration clamps. Provide metal cradle at hangers to protect insulation from crushing.
Piping & Tubing
23. Snowmelt distribution piping INSIDE:
a. Type 'L' copper, wrought copper fittings, and no lead solder.
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welded and flanged joints. OR,
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Approved fitting manufacturers include Anvil International Inc. & Victaulic Company of America (or
approved equal). OR,
23. Snowmelt distribution piping BURIED OUTSIDE: PEX plastic according to ASTM F 876. Size per plans.
Cross-linking shall be achieved by the Engel or Silane method. Tubing shall have oxygen barrier that limits
oxygen diffusion through the tube to maximum 0.10 mg per cu. m/day at 104 deg F (40 deg C) according to DIN
4726. Fittings shall be according to ASTM F 1807, metal insert and copper crimp rings, or other approved method
by the manufacturer and engineer. Tubing shall be rated for a minimum 100 psig (690 kPa) pressure and 180 deg
F (82 deg C) temperature. All tubing and fittings shall be compatible with existing tubing.
24. Snowmelt tubing (loops) - 5/8" PEX plastic according to ASTM F 876. Cross-linking shall be achieved by the
Engel or Silane method. Tubing shall have oxygen barrier that limits oxygen diffusion through the tube to
maximum 0.10 mg per cu. m/day at 104 deg F (40 deg C) according to DIN 4726. Fittings shall be according to
ASTM F 1807, metal insert and copper crimp rings. Tubing shall be rated for a minimum 100 psig (690 kPa)
pressure and 180 deg F (82 deg C) temperature. All tubing and fittings shall be compatible with existing tubing.
Tubing to have 25 year warranty.
25. Condensing boiler condensate shall be neutralized via a neutralization condensation tank with integral condensate
lift pump (see CNTP-1 spec) before discharge into building drainage system. Condensate piping shall be PVC or
other approved material suitable for pH levels of 3.
26. Gas Piping - Schedule 40 black steel pipe, 150 lb. malleable iron screwed fittings on above ground pipe, welded
fittings with all piping coated and wrapped on buried pipe. Piping must be pressure tested per code and per Town
of Vail special requirements.
27. Gas Valves - Lubricated plug valve 175 lb. W.O.G. iron screwed or flanged.
28. Support pipe with rod and clevis or clamps as required by code. No pipe tape allowed.
29. Provide expansion joints or loops on all snowmelt piping runs in excess of 50'.
30. Install plumbing clean-outs as required by applicable codes.
Boiler Flue & Combustion Air Piping
31. B-1 boiler flue & combustion air piping shall be either PVC or CPVC schedule 40, assembled with proper pipe
cement & primer.
32. B-1 boiler combustion air shall be PVC or galvanized sheet metal, as per boiler installation instructions.
33. Seal all ductwork joints and vapor barrier penetrations at all exterior walls.
34. Sheet metal and fittings to be pursuant to SMACNA and ASHRAE standards.
Balancing
35. Water flows must be balanced and pumps and drive systems adjusted as required. Upon start-up, operate
snowmelt system with all balance valves in the full open position. Balance system by integral flow gauges at
manifolds and by return water temperature of each loop across manifold to be certain of even flow. Adjust
individual loop balance valves as needed. After system balancing has been done, mark balancing valves to
permanently indicate final balanced position. Balance contractor shall furnish subsequent water flow balances
before Mechanical acceptance of the snowmelt system.
Snowmelt Specialties
36. New tubing shall be installed in continuous loops, no splices allowed, on 9" centers. Approximate loop lengths are
specified in the snowmelt zone schedule on M1.0. Tubing loops off each manifold shall be installed in equivalent
lengths, as best as possible (+/- 5%).
37. The contractor shall install manifolds as provided by the tubing manufacturer. The manifolds shall consist of a
return header (including: balancing valve for each loop, threaded fitting to receive tubes and air vent) and supply
header (including: visual flow gauge [0-4 GPM] for each loop and threaded fitting to receive tubes).
38. Secure piping in snowmelt areas by attaching tubing to wire mesh using plastic tie straps, every 3' on straight runs
and at apex of turn for any change of direction. No metal wiring shall be used.
39. Entire snowmelt system shall be pressure tested in accordance with tubing manufacturers instructions as required
for warranty protection. In the absence of manufacturers instruction, pressurize the entire snowmelt system with
compressed air. Charge system to a pressure of not less than 80 psig or more than 100 psig. Pressure test shall last
for 24 hours with not less than a 2 psig drop. With system air charged, soap test all joint on and within the
manifolds. After hydrostatic test pressure has been applied, examine piping, joints and connections for leakage.
Eliminate any leaks as necessary & re-test. Any portion of tubing layout that rises as a result of being pressurized
shall be re-secured to be at the proper level within the slab structure when poured.
40. Entire snowmelt system shall be left pressurized with monitoring pressure gauge throughout installation of pavers.
Continually monitor pressure on system to make certain tubing system remains intact with no leaks or punctures.
41. Manifolds shall be tagged to identify area served. Each connection on supply & return manifolds shall be
permanetly labeled with loop number.
42. Prior to final system fill and commissioning, the PEX tubing system and manifolds shall be chemically cleaned as
prescribed by the tubing manufacturer. Supply all tools, connections, labor, and accessories necessary to properly
remove all foreign material, chemical, and residue within the tubing system before permanently charging system
and placing into operation.
43. After entire system has been properly cleaned and flushed, fill system with clean water to proper cold fill pressure.
Add propylene glycol to the snowmelt system to a concentration of 50% glycol/50% water using a positive
displacement pump. Antifreeze fluid shall include corrosion inhibitors. Purge each individual loop to eliminate air
pockets in the system. After purging remove fill connection to any potable water lines to prevent any possibility
of contamination.
44. Tubing shall be graded level and laid in a manner that will allow sand to envelope each tube as well as allow
complete sand coverage over top of each tube and prevent pavers from coming in direct contact with tubing.
45. Prior to Owner turnover, fill glycol feeder with glycol solution.
END OF MECHANICAL SPECIFICATIONS.
1. Snowmelt System (B-1 Boiler)
1.1. Provide a Tekmar 654 automatic snowmelting control with Tekmar 091/094 snow/ice sensor.
1.2. Upon a call for snowmelting from snow/ice sensor, P-1 pump shall start & B-1 boiler shall be enabled.
Boiler supply temperature shall be set at 120qF (adj.).
1.3. B-1 boiler shall be internally modulated by integral controls (Lochinvar Smart System controls) to
maintain HWS setpoint.
1.4. Boiler shall be disabled by high level float switch integral to CNTP-1 Condensate Neutralization Tank w/
Pump. Provide control wiring as required.
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temperature, snowmelting is disabled.
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temperature, snowmelting is disabled.
2. P-1 Pump (Variable Primary Flow)
2.1. Pump shall be furnished with a remote mounted VFD.
2.2. MAX FLOW: Equal to design flow. Utilize VFD for water balancing and at design flow conditions,
determine the associated Hertz setting. Use this Hertz setting for maximum flow parameter.
2.3. MIN FLOW: Use a fixed Hertz setting of 20 Hz (adj.) for minimum flow parameter.
2.4. VARIABLE FLOW: The internal control of the boiler sends a 0-10 VDC signal to control the pump
speed. The pump speed signal is calculated by monitoring the system temperature, boiler modulation rate,
inlet temperature and outlet temperature. Pump speed shall vary between MIN FLOW and MAX FLOW,
as assigned above.
3. Glycol Feeder (GF-1)
3.1. GF-1 glycol feeder shall be controlled by integral controls.
3.2. Set pressure setting so that glycol feeder automatically maintains closed loop system pressure at
approximately 15 psi (adj.).
4. Condensate Neutralization Tank with Pump ( CNTP-1)
4.1. CNTP-1 condensate neutralization tank with integral lift pumps shall be controlled by integral controls,
using low level float switch to activate pump.
4.2. Provide control wiring for high level float switch, such that when high level is detected, boiler is disabled
and cannot operate until pump is inspected.
END OF SEQUENCE OF OPERATION.
SEQUENCE OF OPERATIONMECHANICAL SPECIFICATIONS
04/13/18