1. GENERAL DESCRIPTION:
Each air-cooled heat exchanger shall be of
the forced draft, horizontal (vertical airflow) type or vertical (horizontal
airflow), as manufactured by Ecodyne Heat Exchangers located in Houston , Texas high point
2. THERMAL
PERFORMANCE & MECHANICAL REQUIREMENTS:
Each exchanger shall be capable of
providing the following thermal performance and meet the specified mechanical
design values:
Per
Ecodyne Model No. 8W-10L-1F7 ACHE’s {part # 08207-001} (4 units)
Detail
Description:
- Existing Radiators at
Planters Pumping Station, cooling the existing
- There are existing
four (4) radiators at Planters Pumping Station that need to be replaced.
- The existing positions
of radiators and their inlet and outlet pipes of unit numbers 1 & 2
are mirror images of units 3 & 4.
- The new radiators
shall have the same heat rejection capacity as the existing ones, be
designed for ambient temperature of 950F that will be experienced
in operation, fit on the same foot print, and shall be similar to the
Ecodyne Heat Exchangers (Model Number 8W-10L-1F7, Part Number 08207-001),
or approved equal. (See attached drawing showing the relevant dimensions).
- Each new radiator
shall be stamped with its unit number corresponding to its engine number;
a field verification by Manufacturer Representative is recommended for new
radiators’ positions and their inlet & outlet pipes configuration for
the engines and the gear boxes.
- The time of fabrication
and delivery of units from the date of Notice to Proceed shall be less
than 8 months. Liquidated damages
of $200.00 per day will be assessed for each day that expires after 8
months from the date of the Notice to Proceed until all four units are delivered.
- The units shall be
delivered to the Planters Pump Station,
- The cost shall
include the fabrication, transportation and delivery to Planters Pump
Station.
- Terms of progressive payments (If
required). The initial 50 percent
will be made upon formal purchase order; and the final 50 percent payment
will be made after accepting the delivery and inspection by the parish
personnel.
3. MATERIALS AND CONSTRUCTION:
3.1 Finned Tube Bundle:
3.1.1 Tubes:
The tubes will be welded carbon steel. The tubes shall be
roller expanded into the header box tubesheets. The unfinned portion of the
tubes, between the fin-side of the tubesheet and the first fin, shall not exceed
the thickness of one (1) tubesheet. The exposed unfinned portion of the tubes
shall be coated with a minimum of 3 mils of epoxy to prevent corrosion.
3.1.2 Fins:
The fins shall be aluminum, L-footed, spirally wrapped
type. The fin tube count shall in no case exceed 11 per inch. The fin ends shall be
stapled to prevent loosening. In salt
air environments, the fins should be of marine grade aluminum or be coated with
an epoxy to prevent corrosion.
3.1.3 Header Boxes: (Engine Cool)
The header boxes shall be plug type, fabricated from
carbon steel. The header boxes shall be complete with flanged process
connections. In addition to the flanged process connections, each header box
shall be complete with 1"-3000# FNPT vent and drain connections (with pipe
plugs). At least one (1) header box per tube bundle shall be free to
"float" to accommodate any thermal expansion or contraction of the
finned tubes. The exterior of the completed header boxes shall be SSPC-SP6-
prepared and painted with Ecodyne’s standard paint system.
Header Boxes: (Gear Oil)
The header boxes shall be fabricated from carbon steel.
The header boxes shall be complete with process connections. In addition to the
process connections, each header box shall be complete with 1"-3000# FNPT
vent and drain connections (with pipe plugs). At least one (1) header box per
tube bundle shall be free to "float" to accommodate any thermal
expansion or contraction of the finned tubes. The exterior of the completed
header boxes shall be SSPC-SP6- prepared and painted with Ecodyne’s standard
paint system.
3.1.4 Bundle Frame:
Tube supports fabricated from A-36 structural steel shall
be bolted to the side frames above and below the finned tube bundle assembly.
The spacing of the tube supports shall not exceed six (6) feet. To assure
maximum airflow across the finned tubes, heavy gauge galvanized sheet steel air
seals shall be installed both at the sides and ends of the tube bundle assembly
if gaps exist which would negatively impact performance. Four (4) carbon steel
plate lifting lugs shall be welded to the side frames for use in mounting and
dismounting the tube bundle assemblies to the support structures. Each entire
tube bundle framework assembly shall be hot dip galvanized per ASTM A-123 after
fabrication.
3.1.5 Fin Guard:
If required, each tube bundle shall be complete with a
removable guard to protect the finned tubes from damage due to falling debris.
The guards will be fabricated from 1-1/2” expanded metal welded into a
structural angle framework. The guards will be hot dip galvanized per ASTM
A-123 after fabrication.
3.2 Support Structure:
Each tube bundle assembly shall be mounted on a
self-supporting carbon steel structure. All structural members shall be
continuous welded for corrosion resistance. The plenum chambers shall be
fabricated from a minimum of 11 gauge sheet steel for the side panels, end
panels and the fan decks. These panels shall be bolted to A-36 wide flange beam
columns. The fan drive mounts shall be fabricated from A-36 structural channel
and shall also be bolted to the beam columns. Each of the columns shall be
braced with structural angle "knee" braces to accommodate the
specified loading. Each column shall include an oversized carbon steel base
plate with holes for anchoring each exchanger. Lifting provisions for both the
support structures and the completely assembled exchangers shall be provided.
All of the carbon steel material for the support structures shall be hot dip
galvanized per ASTM A-123 after fabrication.
3.3 Fans and Drives:
The forced draft fan(s) for each exchanger shall be of
the manually adjustable pitch type with airfoil shaped blades fabricated from
aluminum. The fan(s) shall be mounted on housed bearing and shaft assemblies
via split taper bushings. The fan bearings will utilize tapered roller bearing
inserts. The fan(s) shall be “V” belt driven by a 20
HP, 1800 rpm, 3 phase, 60 hertz, 460 volt, totally enclosed, fan cooled,
severe duty, electric motor(s). The motor(s) shall include class F insulation,
Class B temperature rise and a 1.15 service factor at 40°C. Each fan will be
protected by an OSHA compliant, removable, guard. Each belt drive assembly
shall be protected by an OSHA compliant, removable, guard. Remote lubrication
of the fan bearings will be achieved with tubing routed from the fan bearings
to the perimeter of the exchanger. All electrical devices will be suitable for
a Class 1, Group D, Div. II area.
4. FABRICATION:
All materials shall be new and comply with an ASME and/or
ASTM specification.
All welding materials
shall comply with ASME specifications.
All pressure retaining welds shall be performed in
accordance with ASME procedures and by ASME qualified welders, regardless of
exchanger stamping requirements.
All structural welds shall be in accordance with AWS D1.1
and by AWS or ASME qualified welders.
5. TESTING:
Each tube bundle shall be pressure tested in accordance
with the requirements of the ASME
Section VIII
Each exchanger shall be factory run tested prior to
shipment. The results of airflow, noise and vibration tests will be reviewed
and documented for compliance with the design requirements.
6. PREPARATION FOR SHIPMENT:
Each exchanger shall be
completely factory assembled prior to shipment.
The tube bundles shall be charged with 3-5
PSIG of nitrogen and sealed prior to
shipment to minimize
the entrance of contaminants during shipment and storage.
7. PERFORMANCE AND PAYMENT BONDS
In order to insure the faithful performance of each and
every condition, stipulation, and requirement of the contract and to indemnify
and save harmless the Owner from any and all damages, either directly or
indirectly, arising out of any failure to perform same, the successful bidder
to whom the contract is awarded shall furnish a surety Bond in an amount at
least equal to one hundred percent (100%) of the contract price, unless
otherwise specified. The successful
bidder to whom the contract is awarded shall also furnish a labor and materials
payment Bond in an amount at least equal to one hundred percent (100%) of the
Contract Price, unless otherwise specified.
The Contract shall not be in force or binding upon the Owner until such
satisfactory Bonds have been provided.
The Sureties shall be selected by the Contractor, subject to the
approval of the Owner, and the cost of the Bonds shall be paid for by the
Contractor, unless otherwise stipulated in the Supplementary Provisions.
Any security Bond written for a Jefferson Parish public
works project or any other Jefferson Parish Contract requiring a bond shall be
written by a surety or insurance company currently on the U.S. Department of
Treasury Financial Management Service list of approved bonding companies which
is published annually in the Federal Register, or by a Louisiana domiciled
insurance company with at least an A rating in the latest printing of the A.M.
Best’s Key Rating Guide to write individual Bonds up to ten percent of
policyholder’s surplus as shown in the A.M. Best’s Key Rating Guide or by a security
company that complies with the requirements of LSA-.R.S.38:2219
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