TAPPINGCONCRETEPRESSURE PIPEUNDERPRESSURE

ThreadedServiceConnection3/4-inchthrough 2-inch

1.Chip away theone-inch thickmortar coating froman area slightly largerthan base of tappingassembly gland-exposing thereinforcing rod andsteel cylinder.

2.

Cut and remove thereinforcing rod fromthe opening in themortar coating.

3.

The tapping assemblyis ready to beinstalled. Note theO-ring rubber gasketseated in the grooveof the gland.

4.

Position the rubbergasket of the glandagainst theexposed steelcylinder.

5.Position the saddleover the gland.Secure the saddlewith U-bolts aroundthe pipe. Tighten theU-bolts to compressthe rubber gasketagainst the steelcylinder fora watertight seal.

6.

Tighten thecorporation stopinto the factorycut threads of thegland.

7.

Connectthe tappingmachineto thecorporation

8.

Open the corporationstop, advance the drill,cutting through the steelcylinder and concretelining of the pipe.

A carboloy steeltippeddrill is used.

9.

Retract the drill,close thecorporation stopand remove thetappingmachine.

10.

Strap a joint wrapperaround the pipe toaid in applying theprotective coating ofcement mortar overthe assembly.

11.Finally, pour cementmortar into theprepared opening inthe saddle, fillingthe space between thesaddle and gland, applya cement mortar coatingover the entireassembly.

FlangedOutletConnection4-inchand Larger

1.

Remove theone-inch thickmortar coating fromthe area where thetap is to be made-exposing thereinforcing rod andsteel cylinder

2.

Position the saddle overthe opening in the mortarcoating, and securelyattach it tothe pipe with U-bolts.

3.

Cut and remove thereinforcing rod fromwithin the opening,exposing the outersurface of the steelcylinder

4.The flangedtapping gland isfaced and drilledto match thesaddle flange. AnO-ring rubbergasket is placed inthe groove provided.Position the gland inthe saddle with...

for a permanent,watertight seal.Check positionof rubber gasketwith a feelergauge.

6.

Connecta standardtapping valve to thegland flange withthe inner circle ofbolts

7.The power-operatedtapping machine isbrought into position.A shell cutter withcarboloy steel teethis used.

Note the pilot drill-it penetrates the pipewall first and stabilizes theshell cutter as it cuts thesteel core of the pipe

8.Connect the tapping machine tothe tapping valve, open the valveand air test the entire assembly toassure absolute watertightness.

CUTTING: By means of the handscrew, advance the cutter thru theopened valve to the steel cylinder ofthe pipe. When power is applied, thepilot drill will begin to cut the cylinder.

Resistance to feed will suddenly increaseas shell cutter contacts the pipe cylinder andbegins its circular cut. When the feed screwhas advanced a predetermined distance,the operator knows that the cut is complete.

Next, the cutting head iswithdrawn past the gate,and the valve is closed.

9.

Disconnect the tappingmachine. Note the steelcylinder coupon andconcrete lining core cutfrom the pipe wall.

10.Now, three steps remainto complete the tap:

1. Open the valve slightly to flush outany small cuttings that remain;2. Pour cement mortar intoprepared openings in the saddle,filling the space between saddleand gland;3. Apply a protective coating ofcement mortar over the entireassembly

5. its rubber gasketagainst the steel cylinder ofthe pipe. Tighten the outercircle of bolts connectingthe two flanges,compressing the rubbergasket against the cylinder

TAPPING CONCRETE PRESSUREPIPE UNDER PRESSURE

Typical large diameter tapping assemblyavailable from Gifford-Hill-American, Inc.

CONSIDER THESE TAPPING ADVANTAGES:1. Greater strength at point of tap-stress is carried by tapping assembly.2. Rubber gasket seal-no caulking.3. Safety of pressure test before cutting.4. Taps protected throughout by cement mortar.

Regardless of how carefully our water systems are plannedfor the future, there will be requirements for extensions andservices that were not anticipated. Frequently, new growthcenters need to be integrated into existing water systems withfeeder mains and individual serviceconnections.

One of the many advantages of concrete pressure pipe is thatit can be tapped under pressure easily and economically, thisproviding a permanent connection without interrupting service.All types and sizes of concrete pressure pipe can be tappedunder pressure by trained technicians using standard tappingequipment and established tapping methods. The pipe designand pipeline pressure must be checked prior to tapping toassure that the steel cylinder will not be overstressed whenthe rods are cut. If necessary the pipeline pressure must bereduced before the rods are cut and restored only after the tapis completed.

This bulletin illustrates the easy, step-by-step procedure forthreaded outlet taps-3/4 through 2 inches, and flanged outlettaps-4 inches and larger.

PRESSURE TAPPING-A Daily Occurrence

The tapping of pipe is a vital part of normal waterworksexpansion. In fact, concrete pressure pipe is tapped underpressure daily by trained technicians or owners of watersystems.

Firms who have performed pressure taps in concretepressure pipe and continue to offer this service include:

A & A Drilling Svc Inc14360 SE Industrial WayClackamas, OR 97015-9635Phone: (503) 659-8583

Koppl Company1228 West Date StreetMontebello, California 90640Phone: (323) 888-2211

Speer Tap Unlimited11920 342nd Ave NECarnation, WA 98014-7110Phone: (425) 485-4764

International Flow Tech Inc30230 Los Alamos RoadMurrieta, CA 92563-43402Phone: (800) 221-3332

T. D. Williamson, Inc.P. O. Box 2217Tulsa, OK 74101-2217Phone: (888) 839-6766www.tdwilliamson.com

JCM Industries, Inc.P.O. Box 1220Nash, TX, 75569-1220Phone: (800) 527-8482www.jcmindustries.com

AMERON’S OBJECTIVESWe believe the growth of our businesses will be based on how well we identify customer needs and satisfy them overthe long term with products and services of superior value.

We also believe that satisfied, repeat customers are the lifeblood of any successful business and must be nurtured and caredfor in the most professional and courteous manner.

Our customers should expect and receive:

· Strong commitment from us to the markets we serve.· Products and services of consistently superior value.· Professional and dedicated technical services provided promptly where needed.· Well-trained, knowledgeable and motivated direct sales people and representatives.· Professionally prepared, well-documented sales proposals, product literature, technical data and other support

materials.· Fast, courteous response in any transaction.· Consistent, on-time delivery of products and services

• Water Transmission Group Headquarters10681 Foothill Boulevard, Suite 450

Rancho Cucamonga, CA 91730-3857(909) 944-4100 FAX (909) 944-4112

• Western Region Headquarters10681 Foothill Boulevard, Suite 450Rancho Cucamonga, CA 91730-3857(909) 944-4100 FAX (909) 944-4113

Arrow PlantEtiwanda, CA(909) 899-1716 FAX (909) 899-3089

Fontana PlantFontana, CA(909) 822-1280 FAX (909) 356-1343

Lakeside PlantLakeside, CA(619) 561-6363 FAX (619) 443-4540

South Gate PlantSouth Gate, CA(213) 357-6740 FAX (213) 563-1397

Tracy PlantTracy, CA 95377(209) 836-5050 FAX (209) 832-2115

Internet: http//: www.ameronpipe.com Email: pipeinfo@ameronpipe.comcopyright 2002 Ameron Intl. • CCP 11/05 • Printed in U.S.A.

• Southwestern RegionHeadquarters and Plant2325 S. 7th StreetPhoenix, AZ 85034(602) 252-7111 FAX (602) 258-8456

• Protective Lining Products201 North Berry StreetBrea, CA 92621(714) 256-7755 FAX (714) 256-7750

Regional Sales OfficeHouston, Texas8000 Research Forest DriveSuite 115-118The Woodlands, TX 77382(936) 321-1159 FAX (936) 271-1081

• American Pipe and Construction International • Contubos S.A. Calle 193 No. 31-02 Santafé de Bogotá, Colombia 57-1-6740600 FAX 57-1-6710175

Mailing AddressApartado Aereo 90087

Santafé de Bogotá, Colombia