LAKOS PC Screen User Manual

Page 1

LAKOS Plum Creek Intake Screens

Installation Guide

Pre-installation Check List

1. Consult the Flow Rates & Pressures on the reverse side for the pumping

pressure range required on the backwash line at the PC Screen. Note: If pressure is less than the minimum required to operate the screen and backwash system, a booster pump is required

2. IMPORTANT: The PC Screen is a water-pressure driven and backwashed device. If the screen does not have the required pressure delivered to the return line connection at the screen, the screen will not work. Carefully measure the return line size to insure that the proper pressure is delivered to the PC Screen. Do not install a backwash line smaller than that recommended.

3. Be sure you will not be pumping at a rate in excess of your PC Screen’s maximum  ow range.

4. It is very important to thoroughly  ush sand, pebbles, insects, glue and any other debris from the backwash line before installation start-up. Failure to do this could result in plugged spray jets inside the PC Screen.

5. Make certain the pump’s suction/inlet pipe is properly supported and su ciently elevated to allow your PC Screen to rotate freely.

AUTOMATIC PUMP SAFETY SHUT-OFF

CONTROL

1/4” TUBING

SUCTION

FLOW

CHECK

VALV E

SYSTEM

PUMP

PUMP DISCHARGE (MAIN LINE)

BUTTERFLY VALV E

FLOW TO

SYSTEM

NOTE: TO ACHIEVE

GATE VALV E

NECESSARY BACKWASH PRESSURE, A BOOSTER PUMP MAY BE REQUIRED HERE.

IN-LINE STRAINER*

PRESSURE GAUGE*

TO BACKWASH NOZZLES

6. Your PC Screen should not be installed: a) Closer than 6-inches (155 mm) to any object. b) In a con ned area (side culvert, large pipe, etc.) with no means of transferring

debris away from the screen. c) In a current over 3 mph (4.83 km/hr), unless it is protected by an upstream barricade or bell-shield.

Installation & Operation

INSTALLATION

1. Attach the PC Screen’s  anged outlet to

pump’s suction/inlet pipe, using an appropriate adapter, if required. Consult your LAKOS representative if you have questions.

2. Plumb one end of the backwash line into your pump’s discharge pipe.

3. Thoroughly  ush the backwash line of any debris.

4. The backwash line should be plumbed between the pump and a main line valve. This valve can then be partially closed to create su cient back-pressure during start-up. Note: If pressure is inadequate for e cient backwash operation, a booster pump will be necessary.

5. Install on the backwash line: a) a properly-sized gate valve (or pressure

regulator if pressure exceeds 100 psi/6.9 bar);

b) an 8-mesh strainer (supplied); and c) a pressure gauge.

OPERATION

1. Screen does not need more than 2-inches

of submergence because the screen’s rotation breaks up any vortex that might form.

2. Screen should rotate at a rate of at least 15 RPM.

3. Backwash jets should be pointed a) downstream or toward the opposite

embankment when installed in moving water, b) toward the center when used in still bodies of water, and c) toward the surface when screens are deeply submerged. The direction of these spray jets can be easily set by rotating the  ange on the screen’s outlet pipe to adjust the position of the spray bar.

4. To prevent impeded screen rotation or actual damage, the PC must be safeguarded in extremely swift currents (over 3

LAKOS PLUM CREEK SCREEN*

*Provided with basic system

Typical installation

mph {4.83 km/hr}) or in moving water with unusually large debris, such as logs. Either a bell-shield attached to the PC Screen  ange or an upstream barricade can o er the necessary protection. If a barricade is used, it must a) be situated at least 6 to 8-inches (152 to 203 mm) from the screen and b) provide enough clearance underneath to allow water to  ow to create a depression under the screen to prevent silt build-up. (Consult factory for design assistance.)

5. Adding a Screen Retrieval System to lift your PC Screen out of the water during periods of inactivity is always recommended and can prevent algae growth on the screen’s mesh covering.

Page 2

LAKOS PC SCreen Installation Guide

Flow Rates & Pressures

MAXIMUM FLOW RATE

(10 & 18 Mesh) (30 Mesh)

MODEL

PC 915

PC 1415

PC 924

PC 1424

PC 1924

PC 2424

PC 2924

PC 3424

*This pressure required at the PC Screen connection. If pressure is not adequate for e cient backwash operation, a booster pump may be necessary

U.S. gpm

350

560

650

1000

1350

1700

2050

2400

m3/hr

130

150

230

305

385

465

545

Parts Listing

Item #Description

1 Screen outlet pipe assembly

2 Band clamp

3 E.P.D.M. rubber seal

4 Plastic ring

5 Axle pipe

U.S. gpm

250

400

450

700

950

1200

1450

1700

m3/hr

105

160

215

275

330

385

BACKWASH

RETURN LINE

CONNECTION

(inches)

1-1/4

1-1/2

*REQUIRED

BACKWASH

PRESSURE

psi

55-80

60-80

60-100

65-100

70-100

75-100

18 11

kPa

385-560

420-560

420-705

455-705

490-705

525-705

APPROXIMATE

BACKWASH FLOW

AT PROPER PRESSURE

U.S. gpm

m3/hr

2.5

3.5

2.5

4.0

5.5

8.0

9.5

11.5

Note: When ordering replacement parts, please speci y the complete model number of your PC Screen (example: PC-242410GE12) to facilitiate shipment of a part compatible with your particular unit.

6 Spider bushing cap assembly

7 Frame & drive vane assembly

8 Screen cover & rivet pack for frame

9 Jet pipe assembly

10 Delrin spindle

11 Bushing & end cap assembly

12 Spindle nut & washer

13 Hub cap

14 #10 stainless steel 5/8-inch screw

for end caps & hub cap (package contains up to 64 scerws)

15 Backwash spray nozzles (1 to 6x)

16 Drive nozzle

17 Spider bushing

18 Lid bushing

Page 3

Troubleshooting

If your PC Screen fails to rotate properly or if debris passes through the screen into your water system or accumulates on the screens surface, discontinue pumping. Do not resume pumping until the di culty has been located and corrected. Use the following chart of potentially troublesome situations as a checklist to help identify the source of your screen’s particular problem.

Limited Warranty

For warranty and patent information, please visit: www.lakos.com/warranty-info

1365 North Clovis Avenue Fresno, California 93727 USA Telephone: (559) 255-1601 FAX: (559) 255-8093 www.lakos.com [email protected]

Debris

Accumulating

on Screen

Debris

Passing

Through

Screen

X X 1. Water being pumped at a

X X 2. Undersized screen mesh for

X 3. Oversized screen mesh

X X X 4. Clogged backwash line

X X X 5. Undersized backwash line

X 6. Torn screen

X X X 7. Plugged drive jet or

X X 8. Pressure shortage at pump

X X 9. Heavy silt build-up under the

X X 11. Screen located in a closed

X X 12. Unsupported, poorly

X X 13. Algae growth on screen

X X X 14. Mechanical malfunctions

X X 15. Foreign object wedged

X X X 16. Screen located in swift

X X 17. Domed screen in backwash

For additional information, please vist:

http://www.lakos.com/irr-products/pc-screen

and refer to brochure PC-115

Insu cient

Potential Problem Sources

Screen

Rotation

rate in excess of the screen’s capacity

the  ow rate desired

for the  oating debris encountered

backwash strainer

or screen

screen

X 10. Screen installed too close to

another object

area where vegetation & other debris remain trapped

supported or damaged pump suction/inlet pipe

(usually after pumping has been suspended for a prolonged period)

(worn moving parts, seals, etc.)

against screen

current without a protective barricade or bell-shield

line has not been removed

PC-108 (1/14)