Oregon 2024 Standard Specifications for Construction — Section 02420

02420.10 1093 Section 02420 - Metal Pipe

Description

02420.00Scope - This Section includes the requirements for corrugated steel pipe, helical rib pipe,

arch type pipe, aluminum pipe, ductile iron pipe, and special sections intended for use for storm drainage, underdrains and culverts, and not intended for the conveyance of sanitary or industrial waste.

Materials

02420.10Corrugated Steel Pipe and Pipe Arches - Furnish corrugated steel pipe, helical rib pipe,

pipe arches and special sections meeting the requirements of AASHTO M 36 (ASTM A760) Types I, IA, and II, except as follows:

(a)Shapes - Provide either full -circle or elliptical pipe, as the Contractor may elect, unless

otherwise shown or specified. The shapes of pipe fabricated and furnished may include any of the following:

• Full-Circle Pipe - Fabricate helical rib pipe in full -circle Cross Section only. • Arch -Type Pipe

• Elliptical Pipe - Full-circle pipe distorted 5 percent out -of-round by shop fabrication to form an elliptical Cross Section with the major axis vertical.

• Half-Circle Pipe - Fabricate as half sections of full -circle pipe of the same diameter.

• Nestable Pipe - Fabricate i n two separate half sections designed to fit and fasten together to form a full -circle Cross Section of specified diameter. Fasten the two half sections together by approved means which shall provide at least 90 percent of the strength of a standard riveted longitudinal seam.

(b)Connecting Bands - Use connecting bands conforming to the details as shown to make field

joints for pipes and pipe arches not requiring watertight joints.

(c)Special Sections - Furnish special sections such as elbows, wyes, t ees, crosses, bends,

reducers and flared inlets as shown or as directed.

Generally, special sections shall conform to the requirements specified for the pipe with which they are used, and shall be connected to the pipe or to each other with connecting bands specified for use with the pipe to which they are connected.

For elbows of 30 degrees or greater total angle, use three- piece sections of approximately equal length and equal -angle segments or pieces.

Weld joints according to recognized standard practice and repair any damaged zinc or aluminum coating according to 02420.10(d).

(d)Repai r of Damaged Coating - In addition to the methods given in AASHTO M 36

(ASTM A760) the Contractor may repair damaged zinc or aluminum coating by removing all loose or cracked coating, removing all welding flux, wire brushing the damaged area, and applying two coats (minimum 2 mils total thickness) of a high zinc dust content paint conforming to the general requirements of ASTM A780.

02420.11 1094 Damaged zinc or aluminum coating within 3/8 inch of the ends of pipe sections caused by production cut -off of pipe need not be repaired. Coating damage on edges of connecting bands need not be repaired.

(e)Irrigation Pipe - In irrigation pipe installations, where Type D coating (AASHTO M 190) is not

specified, the Contractor will be allowed to furnish pipe with Type D coatin g.

(1)Riveted Seams - If pipes are not furnished with Type D coating, do the following:

• Place a bead or strip of approved caulking compound, 1/8 inch minimum diameter or thickness, between the laps of all riveted seams. • Rivet the annular seams of riveted pipe at spacings not greater than 3 inches. Rivet in a single row the longitudinal seams of pipes less than 42 inches in diameter. Place one rivet in each valley and one on each crest of the corrugations. • Double rivet the longitudinal seams of pipes 42 inches and larger in diameter in each valley of the corrugations and place a single rivet on each crest of the corrugations. • At the intersection of longitudinal and circumferential seams, close the gap caused by the three- sheet lap by special fabrication. Fabricate a special longitudinal seam at the ends of pipe sections for a sufficient distance to clear the coupling bands.

Spot welding of the seams of corrugated metal pipe used in irrigation pipe installations is not allowed.

(2)Field Joints - Use connecting bands conforming to the details shown, and make the field

joints watertight.

(f)Siphon Pipe - Fabricate corrugated steel pipe used in siphons with watertight seams.

Field joints shall provide circumferential and longitudinal strength to pres erve the pipe alignment, prevent separation of pipe sections and provide a watertight joint. Attach the connecting bands so they lap a nearly equal portion of each pipe section to be connected.

(g)Sloped or Skewed Ends - If the ends of pipe culverts require sloped ends, skewed ends or

both, fabricate the ends in a manner that provides good workmanship and a smooth finish. Restore zinc or aluminum coating as directed according to 02420.10(d), and bituminous protective coatings and linings when specified.

02420.11Ductile Iron - Furnish ductile iron pipe conforming to the requirements of AWWA C151

Use Pressure Class 150 - 350 or Special Thickness Class 50 - 56, as directed.

02420.20Protective Coatings - If specified or shown, furnish c orrugated metal pipes with protective

coatings as follows:

(a)Bituminous Protective Coatings - Provide corrugated metal pipe and connecting bands with

bituminous coatings conforming to the requirements of AASHTO M 190 and the following:

• Before immersion, the metal shall be free of grease, dirt, dust, moisture or other contaminants. • Apply the initial bituminous coating by one of the processes under 02420.20(a)(1) or 02420.20(a)(2). • If a second dip is required to meet the coating thickness requirements of AASHTO M 190, the time and temperature requirements of 02420.20 (a)(1) or 02420.20(a)(2) need not be followed for the second dip. 02420.40 1095 • The paved invert for both Type B and Type C coatings on either circular or arc h type pipe shall fill the corrugations for at least 40 percent of the circumference of the pipe.

(1)Pipe Not Preheated - The temperature of the asphalt at the time of pipe immersion shall

be 400 °F ± 5 °F and the duration of the immersion shall conform to the following schedule:

Metal Thickness (Inch) Minimum Immersion Time Steel Aluminum (Minutes)

0.064 0.060 2.5 0.079 0.075 3.0 0.109 0.105 5.0 0.138 0.135 6.5 0.168 0.164 8.0

(2)Pipe Preheated - At the time of pipe immersion the asphalt shall have a temperature

of 380 °F ± 5 °F and the pipe shall be preheated to a temperature 300 °F to 350 °F.

(b)Type D, Fully -Bituminous Coated, Fully -Lined - The interior lining shall be smooth, uniform

and free from sags and runs. Slight resi dual corrugations due to cooling and shrinkage of the lining will not be cause for rejection. At the three- sheet lap an interior nonuniformity equal to the thickness of the sheet will be allowed. Maintain the thickness of the lining to the ends of the pi pe.

(c)Optional Paved Invert - If an asphalt coated pipe with a paved invert (Type C coating) is

shown or specified, a centrifugally -applied interior lining conforming to Type D coating may be furnished as an alternate, providing the minimum thickness of bituminous coating over the crests of the corrugations is not less than 1/4 inch.

(d)Polymeric Coatings - If polymeric coating is shown on the pipe data sheet, use a coating from

02420.30Corrugated Steel Pipe for Underd rains - Furnish corrugated steel pipe for underdrains

conforming to the requirements of AASHTO M 36 (ASTM A760) Type III - Underdrain Pipes, except as modified in 02420.10(c) and 02420.10(d), and as follows:

(a)Class IV - Semicircular pipe may be used only as an alternate with the 6 inch size of perforated

full-circle drain pipe.

(b)Connecting Bands - Connecting bands for underdrain pipe field joints shall conform to the

designs shown.

02420.40Corrugated Aluminum Alloy Pipe - Furnish corrugated aluminum alloy pipe, helical rib

pipe, pipe arches and special sections conforming to the requirements of AASHTO M 196 (ASTM B745), Types I, II and III, except as follows:

(a)Shapes - The shapes of the pipes to be furnished may include any of the shapes described

in 02420.10(a).

(b)Connecting Bands - Use connecting bands conforming to the requirements of

AASHTO M 196 ( ASTM B745) and the details shown to make field joints for pipes and pipe arches not requiring watertight joints.

(c)SpecialSe ctions - Furnish special sections such as elbows, wyes, tees, crosses, bends,

reducers and flared inlets as shown or as directed.

02420.50 1096 Generally, special sections shall conform to the requirements specified for the pipe with which they are used, and shall be c onnected to the pipe or to each other with connecting bands specified for use with the pipe to which they are connected.

For elbows of 30 degrees or greater total angle, use a three- piece section of approximately equal length and equal -angle segments or pieces.

(d)Irrigation Pipe - In irrigation pipe installations where Type D coating is not shown or specified,

the Contractor will be allowed to furnish pipe with Type D coating.

If pipes are not furnished with Type D coating, all riveted seams shall conform to the applicable provisions of 02420.10(e)( 1).

Use connecting bands conforming to AASHTO M 196 ( ASTM B745) and the details shown, and make the field joints watertight for pipe installations used in irrigation.

(e)Siphon Pipe - Fabricate corrugated aluminum alloy pipe used in siphons with watertight

seams.

Field joints shall provide circumferential and longitudinal strength to preserve the pipe alignment, prevent separation of pipe sections and provide a watertight joint. Fabricate the connecting bands from aluminum alloy conforming to AASHTO M 196 ( ASTM B745). Attach the connecting bands so they lap a nearly equal portion of each pipe section to be connected.

(f)Sloped or Skewed Ends - If the ends of pipe culverts require sloped ends, skewed ends or

both, fabricate the ends in a manner that provides good workmanship and a smooth finish. Repair bituminous protective coatings and linings when specified.

02420.50Corrugated Aluminum Alloy Pipe for Underdrains - Furnish corrugated aluminum alloy

pipe for underdrains conforming to the requirements of AASHTO M 196 ( ASTM B745) Type III, except as follows:

(a)Special Sections - The provisions of 02420.40(c) apply.

(b)Connecting Bands - Connecting bands for field joints shall conform to the requirements of

AASHTO M 196 ( ASTM B745) and the details shown.

02420.60Acceptance - Acceptance of pipes, underdrains, and protective coatings will be according

to 00165.35 and this Section.

Source: Oregon Standard Specifications for Construction, 2024 Edition. Pages 1159–1162 of 1,268.

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02430 Structural Plate Pipe