Pipe and fittings shall have welded joints [except as otherwise indicated
or specified]. [Provide [flanged] [or] [threaded] joints where indicated.]
[Provide insulating joints where indicated.]
2.1.1.2
Welded Joints
Electrodes, joint design, welders procedures and qualifications (metal and
PE), and weld examination and testing shall conform to API Std 1104.
2.1.1.3
Flanged Joints
Steel flanges shall conform to ASME B16.5, Class 150. Steel flanges that
are to be connected to cast iron flanges shall be flat face construction.
Provide raised face steel flanges for pipe-to-pipe connections and
connections to flanged steel valves. Bolts, nuts, and gaskets shall
conform to ASME B31.8.
2.1.1.4
Insulating Joints
[Insulating flanged joints shall be steel flanges as specified in paragraph
entitled "Flanged Joints," double end stud bolts sized 1.60 mm 1/16 inch
smaller than standard flange bolt holes, heavy hex nuts, a neoprene faced
insulating gasket, a 0.80 mm 1/32 inch plastic sleeve covering each stud
bolt, and a plastic insulating washer between the flange and each hex nut
on one side of the fitting.] [Insulating unions shall be steel, rated at
1724 kPa (gage) 250 psi working pressure and 93 degrees C 200 degrees F
temperature. Insulation between union parts shall withstand a minimum of
600 volts.]
2.1.1.5
Shop-Applied Coatings for Buried Steel Pipe and Fittings
Pipe coating materials and application procedures on a properly prepared
surface shall be as specified in ASME B31.8. Coating shall have sufficient
adhesion to the metal surface to prevent underfilm migration of moisture,
and be sufficiently ductile to prevent cracking. Coating shall have
strength to prevent damage due to handling and soil stress, and have
properties compatible with supplemental cathodic protection. Pipe shall
receive either coal tar enamel, adhesive-thermoplastic resin, or
fusion-bonded epoxy, shop-applied coatings. Completed joints shall be
coated after installation and testing as specified in paragraph entitled
"Protection Against Corrosion (Field Applied)."
2.1.1.6
Coal Tar Enamel Coating
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NOTE: For all ordinary purposes, single wrapping of
pipe is considered to afford sufficient protection.
Where additional shielding is necessary because of
stony soil or as additional protection in shipping,
double wrapping should be specified.
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Except as otherwise specified in this paragraph, clean, prime, and coat
exterior of pipe and fittings with hot-applied coal tar enamel and [a
bonded layer of felt wrap in accordance with AWWA C203] [bonded double felt
wraps in accordance with AWWA C203, and Appendix Section A1.2 of AWWA C203
]. Do not use asbestos felt. Provide fibrous-glass mat felt material as
specified in Appendix Section A2.1 of AWWA C203. Coating shall be
SECTION 02551N
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