RFI 73 attachment.pdf

HWA Responses to Pre-Bid RFI #96 USFS Bend Pine Admin Site 5/3/10

221329 SANITARY SEWERAGE PUMPS

2.1.A.9 Delete the words “capacitor-start type”

2.1.A.14 Delete the words “with twist-lock connectors and sufficient length to reach from pumps to interior of pump control shed”

221343 FACILITY SEWAGE PUMPING STATION

1.4 SUBMITTALS

Add the following:

I. Provide all drawings in AutoCAD format DWG and hard copy and in PDF format

J. Provide Schematic ladder diagram with line numbers wire numbers, pin numbers for all devices

K. Provide Physical wiring diagram of back panel and back of door showing all pins on all devices and all wire numbers to all devices.

L. Provide Materials list of all components in XLS format with make model # source of supply

M. Provide Physical dimensional drawings to scale of outside of panel and inside of panel showing all components to scale.

N. Provide written (in MS Word DOC format) operations instructions, functional description of control logic line by line, troubleshooting guide, calibration instructions for entire system.

2.2 CONTROLS

Replace this entire section with the following:

2.2 SEQUENCE OF OPERATION AND CONTROL PANEL REQUIREMENTS.

A. Lift Stations (LS-1):

1. Each lift station contains two (2) pumps that shall run in a duplex alternating (one at a time) fashion, using an “on-demand” scheme controlled by float switch inputs.

2. The pumping mode of the submersible pumps shall depend on the input of five (5) float switches installed in the wet well:

3. High Level Alarm dseaman Cross-Out dseaman Text Box

4. Lag Pump On

5. Lead Pump On

6. Pumps Off

7. Low Water Alarm/Redundant Off

8. Normal system operation shall keep the wastewater liquid level between the Lead Pump On and Pumps Off floats.

9. The lead pump shall start when the Lead Pump On float is raised and shall remain on until the Pumps Off float drops.

10. During periods of high flow, the wastewater level in the wet well may rise to the point where the Lag Pump On float switch is raised. When this float is up, both pumps shall run simultaneously and both pumps shall remain on until the pumps Off float drops or the minimum run timer is exhausted, whichever comes last.

11. If both pumps cannot keep up with the flow and the High Level Alarm float is raised, an alarm will be sent to notify the operator of the high level condition.

12. In the event that the wastewater level drops below the bottom float, all automatic pump activity is ceased and an alarm shall be set to notify the operator of the low wastewater liquid level condition.

B. Lift Station Control Panel Features

1. In the event of an alarm, the control panel shall activate a local light and an audible alarm on the pump control shed, the remote annunciator at the Admin Building reception desk, and the auto dialer.

The control panel shall be capable of sending email alerts, provided the panel is connected via Ethernet to a network that has access to an email server.

2. Control Sequence of Operation: Cycle each sewage pump on and off automatically to maintain wet-well sewage level. Automatic control operates both pumps in parallel if wet-well level rises above starting point of low-level pump, until shutoff level is reached. Automatic alternator, with manual disconnect switch, changes sequence of lead-lag sewage pumps at completion of each pumping cycle.

C. Pump station control panel physical requirements and construction

1. Provide a complete UL 508A for class 1 Div 1 intrinsically safe controls for a duplex pump station ladder schematic diagram of the pump station logic and front panel layout showing all operators interface controls as follows:

2. Provide the following controls:

a. Provide a main door interlocked circuit breaker to shut off entire panel when door is opened.

b. 120/24VAC control transformer.

c. Control logic is all 24VAC plug in relays all 3PDT octal base relays

d. Provide 24VDC intrinsically safe relays or normal relay with intrinsically safe barriers.

e. Provide A-O-C test switches on each of the five float switches to allow testing of control logic.

f. Provide lightning protectors on each float switch circuit exiting panel.

g. Provide GFCI for 240V/120VAC transformer secondary.

h. Provide a 24VDC power supply for float switches and to provide power for alarm system and recharging 24VDC 7.5AH gell cell alarm battery.

i. Provide HOA switches for each motor.

j. Provide 24VAC Running time meter and operation counter and green run light for each motor operated by an aux contact on the motor starter.

k. Provide a seal fail probe in each motor. Also provide a red seal fail light for indication only. Do not shut down pump on seal alarm.

l. Provide internal thermal overload switch NC in each pump motor.

m. Motor shall have two cords one for power and one common cord for seal fail / thermal detectors.

n. Provide MCP with aux trip contact for each motor. Tie into overload alarm for a common alarm and also thermal detectors Provide a common red overload/breaker trip / thermal detector alarm light.

o. Provide a common red overload / MCP breaker trip / thermal detector light indicator light for motor starter overload for each motor.

p. Provide a general alarm light for any alarm condition and an external 24VDC strobe light external to building on a battery backup.

q. Indicator lights 24VAC LED lamps, no incandescent lamps

r. Provide a white power on light for 24VAC and 24VDC power supplies.

s. Provide three phase voltage monitor to shut system down on phase fault. Provide a bypass test switch for voltage monitor.

t. Provide an alternator with a manual switch to select either lead pump 1 or two or automatic alternation on each pump cycle.

u. Provide 5 float switches thru intrinsically safe relays:

i. Provide AOC test switches for each float switch.

ii. High Level alarm light

iii. Lag Pump on

iv. Lead pump on

v. Both pumps off

vi. Low Level alarm light

v. Provide a common contact to energize a drain back external valve if both pumps are off, 10A @ 120VAC rated.

w. Provide one common time delayed genera alarm light for all alarm functions as follows.

x. Provide a time delay in reset bus and alarm reset pushbutton to reset high and low level alarms. All other manually reset.

y. Provide a 24VDC battery backed up alarm external general alarm strobe light and alarm horn (with on/off silence switch) for any of the following conditions. Also provide a common NO dry contact for alarm external alarm for a dialer and a 24VDC external alarm voltage to main building for remote alarm for any of the following alarms.

i. Overload pump 1 or 2 or thermal detector

ii. MCP breaker trip pump 1 o 2

iii. Power loss AC or DC power loss

iv. High level alarm

v. Low level alarm

z. Provide a 240v/24VAC single phase transformer for control power and to provide power for the following:

aa. Provide lightning arrestors for float switches and external remote alarm contacts

bb. Provide service entrance lightning arrestor on panel with circuit breaker

cc. On low or high voltage phase monitor relay shut control power off to panel, and energizes remote alarm contact, alarm 24VDC to main building and external alarm light and strobe on pump house.

dd. Duplex Pump Operation

i. Level rises to 1 pump on, pump runs till pump off float switch reached

ii. Level rises to 2 pump on lag float both pumps turn on till pump off float is reached

iii. Low level alarm is redundant pump off, pump turns on/off with low level float.

iv. High level alarm sounds general alarm and strobe.

v. If one pump overloads / breaker trips, remaining pump is lead pump until reset, tie into alternator circuit.

vi. If one pump is taken out of service with HOA switch in off, remaining pump becomes lead pump with each pump cycle.

D. Control Panel Mounting: Inside pump station control shed, on west wall.

Install labels on panel face to identify switches and controls.

E. Wiring: Tin-copper wiring F. Connection for Portable Generator: None required.

2.3.C Replace this entire section with the following:

C. Provide a remote annunciator in office that will detect a contact closure over a #22AWG control cable at pump station and provide the following functions.

1. Provide a 24VDC power supply to drive 24VDC relay to monitor a contact closure in pump station control panel for any alarm, power loss, or any other alarm.

2. Provide on the annunciator face the following controls:

24VDC power on light

3. General alarm red light for pump station Telephone dialer on / off switch

4. Energize a mini 1” diameter strobe light at reception desk and on annunciator and a sonalert for annunciation in addition to the general alarm light on annunciator. Provide a 4”x 6” panel at reception desk with a horn silence switch to silence sonalert and mini strobe light.

5. Provide a voice dialer in annunciator to dial up to 4 people with tone acknowledgement of alarm in remote annunciator panel.

6. Provide a dialer on/off switch. Dialer shall dial out on internal battery if annunciator panel loses power.

7. Provide a schematic diagram, physical wiring diagram, wire numbers on all wires.