Laserfiche WebLink
MERIT® <br />Weld -Miser Tim Tee -Let® <br />Installation <br />Welding Outlet Fittings <br />Threading Practice <br />Tee -Let° thread form is consistent with Aeronautical National Form <br />(ANPT) AS71051. The thread is fully formed over both the L-1 hand <br />tight and L-3 wrench tight threads. NPT tapered threads are typically <br />gauged only over the L-1 threads. This makes Tee -Lets more forgiv- <br />ing of field cut threaded pipe that may only marginally conform to the <br />specification. Fewer leaks translate into lower costs. <br />Ease of Installation <br />Merit Manufacturing Tee -Lets are designed to sit higher on the pipe, <br />thereby requiring less weld and eliminating burn through. Tee -Lets sit <br />higher on the header or branch line pipe than competitive fittings. This <br />allows the welding torch to remain in an optimum position for welding. <br />In addition, 11/z" and larger Type A female threaded and Type C <br />grooved Tee -Lets require the same hole size for installation. This results <br />in fewer change overs when installed using automatic welders. <br />El�e,h,i E�we,h,i <br />w�ht Th eeneA w�� �� <br />TI Al . Al TA�e� T�AI TA�e� <br />WonTeelel LI V Teme§ V <br />PIIon I1re Mete Pile Mele Pipe <br />PEA <br />Tepere] Aole mAOAee 9leNNeN W Aril <br />pooh llneol Nree] pedao_ <br />e n%afrAdinne] lrunmW non <br />kmele th.ad 13NreeAe <br />MERIT NPT THREAD FORM STANDARD NPTTHREAD FORM <br />Urop Nipple <br />TAPEREDNPT <br />Ll <br />PIPE THREADS <br />L3 <br />Total <br />L2 <br />or Tee -Let <br />Hand Tight <br />Wrench Tight <br />Ll-L3 <br />Effective <br />Outlet Size <br />Len h <br />Threads <br />In. mm <br />In. mm <br />Threads <br />In. ..m <br />Threads <br />In. mm <br />Threads <br />In. mm <br />Threads <br />1/2" <br />0.320 <br />4.48 <br />0.214 <br />3.00 <br />0.534 <br />7.48 <br />0.534 <br />7.47 <br />15 <br />81 <br />5.4 <br />136 <br />13.6 <br />3/4" <br />0.339 <br />4.75 <br />0.214 <br />3.00 <br />0.553 <br />7.75 <br />0.546 <br />7.64 <br />20 <br />86 <br />5.4 <br />140 <br />13.9 <br />1" <br />0.400 <br />4.60 <br />0.261 <br />3.00 <br />0.661 <br />7.60 <br />0.683 <br />7.85 <br />25 <br />102 <br />6.6 <br />168 <br />173 <br />11/4" <br />0.420 <br />4.83 <br />0.261 <br />3.00 <br />0.681 <br />7.83 <br />0.707 <br />8.13 <br />32 <br />107 <br />6.6 <br />173 <br />18.0 <br />11/2" <br />0.420 <br />483 <br />0.261 <br />300 <br />0.697 <br />783 <br />0.724 <br />8.32 <br />40 <br />107 <br />. <br />6.6 <br />. <br />177 <br />. <br />18.4 <br />2" <br />0.436 <br />5.01 <br />0.261 <br />3.00 <br />0.706 <br />8.01 <br />0.757 <br />8.70 <br />50 <br />11.1 <br />6.6 <br />179 <br />19.2 <br />21/2" <br />0.682 <br />5.46 <br />0.250 <br />2.00 <br />0.932 <br />7.46 <br />1.138 <br />9.10 <br />65 <br />173 <br />6.4 <br />237 <br />28.9 <br />3 <br />0.766 <br />6.13 <br />0.250 <br />2.00 <br />1.016 <br />8.13 <br />1.200 <br />9.60 <br />80 <br />195 <br />6.4 <br />258 <br />30.5 <br />4 <br />0.844 <br />6.75 <br />0.250 <br />2.00 <br />1.094 <br />8.75 <br />1.300 <br />10.40 <br />100 <br />21.4 <br />6.4 <br />278 <br />33.0 <br />Domestic Manufacture <br />Increasingly, federal, state, municipal, and quasi municipal authorities <br />require domestic content for fire sprinkler systems. Merit° Tee -Lets"' <br />meet these requirements. The need to maintain dual inventories, one <br />domestic, one import is eliminated. <br />Welding Practice <br />When measured with respect to linear inches of weld required for <br />r-2.650°- <br />installation, Tee -Lets require up to 15% less weld than competitive <br />fittings. This reduces time and savings over time are substantial. The <br />; <br />diameter of the contoured end of Type A Tee -Lets has been reduced so <br />ss° <br />that the wall thickness more nearly matches the header or branch line <br />--' <br />pipe wall thickness. Therefore, current and voltage settings required <br />for welding are set to provide for adequate penetration without burn <br />^' 205", <br />through and cold shutting. Also, weld volume required for installation <br />2" Merit Weld -Miser <br />is lower for Tee -Lets than most other fittings. Typically, Tee -Lets re- <br />Tee -Let <br />quire one -weld pass for attachment <br />Outlet <br />WELDING <br />MERIT WELD -MISER TEE -LET <br />COMPETITIVE FITTING <br />Size <br />WELD VOLUME` <br />LINEAR WELDING <br />WELD VOLUME` <br />LINEAR WELDING <br />In. imm) <br />Cross Sec. Area <br />%less <br />In.imm) <br />%less <br />Cross Sec. Area <br />%maze <br />In.imm) <br />%less <br />1" <br />0.051 sq.in. <br />2.48 <br />0.058 sq. in. <br />2.48 <br />12% <br />0� <br />12% <br />0% <br />25 <br />329sgmm <br />62.9 <br />374sgmm <br />629 <br />11/4" <br />0.032" <br />2.88 <br />0.063 <br />3.01 <br />48� <br />4� <br />48� <br />4� <br />32 <br />206 <br />73.1 <br />406 <br />734 <br />11/2" <br />0.036" <br />3.12 <br />0.060 <br />3.46 <br />40% <br />i0% <br />40% <br />10% <br />40 <br />232 <br />79.2 <br />387 <br />878 <br />2" <br />0.040" <br />3.77 <br />0.106 <br />4.41 <br />62% <br />15% <br />62% <br />15% <br />50 <br />258 <br />95.7 <br />683 <br />1120 <br />-S- Merit-1.10 <br />/I - Stay" <br />na Proaucto nMSlon&Mvll International <br />