TAPPING DUCTIL E IRON PIPE

1 2006 EDITION TAPPING ductile iron PIPETECHNICAL BULLETIN FOR WATER & WASTEWATER, FIRE PROTECTIONNSF Certified toANSI/NSF 61 TAPPING ductile iron PIPEP 2006 EDITIONREVISED pipe AND FOUNDRY CO. TAPPING ductile iron pipe BRO-035 NSF Certified toANSI/NSF 61 Table of ContentsPipe Thickness Required for Different Tap Sizes 3 TAPPING Test Details 5 Test Procedure 6 Observations and Comments pipe Products for Water, Wastewater and Fire Protection 8 TAPPING ductile iron PIPEP 2006 EDITIONREVISED pipe AND FOUNDRY CO. TAPPING ductile iron pipe BRO-035 NSF Certified toANSI/NSF 61No. ofThreadsPipe Thickness Required for Different Tap Sizes 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 3 1/2 43 2 - - - - - - -3 3 - - - - - - -3 4 - - - - - - -4 2 - - - - - -4 3 - - - - - -4 4 - - - - - -6 2 - - - - -6 3 - - - - -6 4 - - - - -8 2 - - - -8 3 - - - -8 4 - - - -10 2 - - -10 3 - - -10 4 - - -12 2 - -12 3 - -12 4 - -14 2 3 4 2 3 4 2

2 3 : pipe thickness required for different tap sizes as per ANSI/ASME (American Society of Mechanical Engineers, 345 E. 47th St., New York, NY 10017) for standard taper pipe threads with two, three and four full threads . T o c o n v e r t i n c h e s t o m i l l i m e t e r s , m u l t i p l y b y 2 5 . 4 .Tap SizeinchesPipe SizeinchesTAPPING ductile iron PIPEP 2006 EDITIONREVISED pipe AND FOUNDRY CO. TAPPING ductile iron pipe BRO-035 NSF Certified toANSI/NSF 6118 4 2 3 4 2 3 4 2 3 4 2 3 4 2 3 4 2 3 4 2 3 4 2 3 4 2 3 4

3 Thickness Required for Different Tap Sizes (cont.)1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 3 1/2 4 NOTE: pipe thickness required for different tap sizes as per ANSI/ASME (American Society of Mechanical Engineers, 345 E. 47th St., New York, NY 10017) for standard taper pipe threads with two, three and four full threads . T o c o n v e r t i n c h e s t o m i l l i m e t e r s , m u l t i p l y b y 2 5 . 4 .Tap SizeinchesPipe SizeinchesNo. ofThreadsTAPPING ductile iron PIPEP 2006 EDITIONREVISED pipe AND FOUNDRY CO. TAPPING ductile iron pipe BRO-035 NSF Certified toANSI/NSF 61 Tests performed by the ductile iron pipe Research Association prove that.

4 25" wall ductile iron pipe can be tapped with 3/4" or 1" service taps without using TAPPING saddles. TAPPING tests that were performed and the results of these tests are outlined below. Test Details pipe Specimens: Two test specimens of nominal 6" diameter ductile iron pipe , each 4 feet in length, were cut from a full length piece of pipe (18 feet). Average wall thickness of the pipe was ". The pipe was cement-mortar-lined with an average thickness for the lining of ".Each 4' length was capped at both ends and installed in a test press. Provisions in the end caps permitted filling the pipe specimen with water, release of entrapped air and connections to a high pressure pump and pressure gauge for subsequent pressurization to desired & TappingSix 3/4" corporation stops were installed in one pipe specimen while six 1" corporation stops were installed in the other 4' pipe specimen.

5 The corporation stops were Mueller #H-9971 and all were new. A Mueller B-100 TAPPING machine was used to install the corporations in accordance with the recommended procedure. Mueller #580180 and #580181 combination drills and taps were used in the TAPPING machine to drill and thread the holes for installation of the corporations. Both combination drills and taps were CorporationsTwo each 3/4" and 1" corporations (all new) Mueller #H15050 were obtained for installation in the pipe specimens as substitution for some of the #H-9971 corporations. The #H15050 corporation has a compression ring or collar and a compression nut which was tightened following the usual installation of the corporation in the tapped hole.

6 The compression of the ring or collar by the nut is designed to prevent leakage at the threads of the corporation inlet and the pipe Selection Thread EngagementWater utilities frequently install 3/4" and 1" corporations in nominal 6" diameter pipe . It is usual for the utilities to standardize on one size, such as 5/8", 3/4" or 1" for 6" pipe to reduce inventory or to avoid test used 3/4" and 1" corporations since a difference in the number of threads per inch on the inlets occurs between these two sizes of corporations. The 3/4" corporation has 14 threads per inch while the 1" has 12 threads per inch. Corporations smaller than 3/4" also have 14 threads per inch while those larger than 1" (1-1/4", 1-1/2" and 2") have 11-1/2 threads per engagement for 3/4" corporations (14 ) in a " pipe wall is equivalent to approximately engagement for 1" corporation (12 ) in the same pipe is equivalent to approximately number of full threads engaged increases as pipe diameter Test DetailsTAPPING ductile iron PIPEP 2006 EDITIONREVISED pipe AND FOUNDRY CO.

7 TAPPING ductile iron pipe BRO-035 NSF Certified toANSI/NSF 61 The corporations were installed using the equipment described with six 3/4" corporations being installed on one pipe specimen and six 1" corporations installed on the other. No thread lubricant or sealant was used on any of the corporations in the initial tests as this duplicates the practice frequently used in the corporations were installed and tightened with a torque wrench to an initial 50 ft/lbs. Additional torquing to stop leakage at the inlet threads was made in the same manner and six corporations installed in each of the two test specimens were placed in two rows, three to a row, with approximately 60 degrees between the rows.

8 The corporations were separated longitudinally by approximately 10 inches. The two rows were offset longitudinally by about 3 inches to facilitate attachment of the TAPPING filling the test specimen with water and bleeding off entrapped air, the test pressure was increased in steps and held at each stop to permit close inspection of the corporations and the test pipe and/or the tightening of corporations to stop leakage if the test run where no thread lubricant or sealant was used, the corporations were removed and reinstalled in the same holes after the threads received a double wrap of Teflon tape to act as a thread lubricant and sealant. The same step-by-step test procedure was Teflon tape was used since it is non-toxic and does not contribute to taste and odor problems in the water.

9 Other lubricants or sealants can be used but toxicity and possible contribution to taste and odor in the water would have to be of each size of the #H-15050 corporations were substituted for one of the #H-9971 corporations following the test series using the Teflon tape. The #H-15050 corporations, however, were installed without the use of the Teflon thread preceding tests were duplicated for both the 3/4" and 1" corporations. Copies of test details are available upon final test involved pressurizing the specimen with 1" corporations, including the #H-15050, to 1,000 psi to determine if the corporations might blow out of the pipe or the pipe wall deform in the vicinity of the , as reported in the test results, was that amount of water escaping which exceeded one drop per ProcedureTAPPING ductile iron PIPEP 2006 EDITIONREVISED pipe AND FOUNDRY CO.

10 TAPPING ductile iron pipe BRO-035 NSF Certified toANSI/NSF 611. Under the conditions of the tests, leakage occurred at the inlet threads ( pipe wall) of the corporation fittings in 50% of the total 3/4" corporations installed without thread lubricant or sealant at 45 psi and 50 of torque. Five of the six 3/4" corporations were torqued at different pressure levels to 90 to stop Under the same test conditions, leakage occurred at the inlet threads ( pipe wall) of the 1" corporation fittings in five of the six installed at 45 psi and 50 of torque. These corporations were installed without thread lubricant or sealant. Five of the six 1" corporations were torqued to 100 to 130 at different pressure levels to stop The use of the inert Teflon tape as a thread lubricant and sealant prevented all leakage at the inlet threads in both sizes of corporation fittings at all test pressures with only 30 of torque when initially Mueller #H-15050 corporations, sizes 3/4" and 1", were used.