Questions from Industry Thru 20 Dec 2022.pdf

Questions from Industry 12305B23Q0020 As of 20 December 2022

1. Please provide piping and insulation specifications for all systems.

Govt Response:

PIPE SPECIFICATIONS:

A. High Pressure Steam and Trapped Condensate Piping:

1. Pipe 2 inches and smaller: Carbon steel, ASTM A53, Grade B, seamless, Schedule 80.

a. Fittings: Forged steel, ASTM A105, socket weld, 300 lb.

b. Joints: Socket weld.

c. Unions: Forged steel, ASTM A105, socket weld, 3000 lb., stainless steel seats.

d. Gaskets: Flexitallic Style CG, API 601 sprial wound 304SS with Grafoil Fill or accepted substitution.

e. Cathodic Protection Gaskets: 1/16 inch thick Sealon by Ameriflex. Specify OD and ID of pipe and flanges. Bolt holes to be ¼ inch oversized.

2. Pipe 2-1/2 inches and larger: Carbon steel, ASTM A53, Grade B, seamless; standard weight for steam, Schedule 80 for condensate.

a. Fittings: Carbon steel, ASTM A234 WPB, seamless welding fittings, standard weight for steam, Schedule 80 for condensate.

b. Joints: Butt weld.

c. Flanges: 300 lb., ANSI forged carbon steel, ASTM A181 Class 70, weld neck raised face.

d. Gaskets: Flexitallic Style CG, API 601 spiral wound 304SS with Grafoil Fill or accepted substitution.

e. Cathodic Protection Gaskets: 1/8 inch thick Sealon by Ameriflex. Specify OD and ID of pipe and flanges. Bolt holes to be ¼ inch oversized.

B. Medium Pressure Steam and Trapped Condensate Piping:

1. Pipe 2 inches and smaller: Carbon steel, ASTM A53, Grade B, seamless, Schedule 80.

a. Fittings: 125 lb., cast iron, screwed, conforming to ANSI B16.4. Thread-o-lets may be used when the branch line is 1/3 the main size or less.

b. Joints: Screwed.

c. Unions: Class 300 malleable iron.

2. Pipe 2-1/2 inches and larger: Carbon steel, ASTM A53, Grade B, seamless, standard weight for steam, Schedule 80 for condensate.

a. Fittings: ASTM A234, Grade WPB, ANSI B16.9; butt welding type, standard weight for steam, Schedule 80 for trapped condensate. Thread-o-lets may be used when the branch line is one-third the main size or less.

b. Joints: Butt weld.

c. Flanges: Class 150, ANSI B16.5, forged carbon steel, raised face. Materials in accord with ASTM A105, Grade II weld neck.

C. Low Pressure Steam and Trapped Condensate Piping:

1. Pipe 2 inches and smaller: Carbon steel, ASTM A53, Grade B seamless, Schedule 40 for steam, Schedule 80 for condensate.

a. Fittings: 125 pound black cast iron. Thread-o-lets may be used when the branch line is one-third the main size or less.

b. Joints: Threaded.

c. Unions: Class 300 malleable iron.

2. Pipe 2-1/2 inches and larger: Carbon steel, ASTM A53, Grade B, seamless, standard weight for steam, Schedule 80 for condensate.

a. Fittings: Butt weld, conforming to ASTM A234, Grade WPB, ANSI B16.9, standard weight for steam, Schedule 80 for trapped condensate.

b. Joints: Butt weld.

c. Flanges: Class 150, ANSI B16.5, forged steel, raised face. Materials in accord with ASTM A105, Grade II, weld neck.

D. Condensate Piping (Building) – Return and Pumped Return:

1. All piping shall be extra strong black steel piping.

2. Fittings on piping 2-1/2 inches and larger shall be extra heavy butt welding type. Flanges shall be 150 lb. welding neck type. Extra strong Weld-o-lets, Thread-o-lets or shaped nipples may be used only when takeoff is one-third or less nominal size of main.

3. Screwed fittings around traps and for piping 2 inches and smaller shall be 125 lb. black cast iron (300 lb. for unions).

E. Condensate and Pumped Return Piping:

1. Pipe 2 inches and smaller: Carbon steel, ASTM A53, Grade B, seamless, Schedule 80.

a. Fittings: Forged steel, ASTM A105, socket weld.

b. Joints: Socket weld.

c. Flanges: 150 lb. ANSI forged carbon steel, ASTM A181, Class 70, socket weld with Flexitallic Style CG Gasket, API 601 spiral wound 304SS with Grafoil Fill or accepted substitution.

d. Cathodic Protection Gaskets: 1/8 inch thick Sealon by Ameriflex. Specify outside diameter (OD) and inside diameter (ID) of pipe and flanges. Bolt holes to be ¼ inch oversized.

2. Pipe 2-1/2 inches and larger: Carbon steel, ASTM A53, Grade B, seamless, Schedule 80.

a. Fittings: 150 lb. ANSI, forged carbon steel, ASTM A181, Class 70, weld neck.

b. Joints: Butt weld, beveled.

c. Flanges: 150 lb. ANSI, forged carbon steel, ASTM A 181, Class 70, weld neck with Flexitallic Style CG gasket, API 601 sprial wound 304SS with Grafoil Fill or accepted substitution.

d. Cathodic Protection Gaskets: Ameriflex. Specify OD and ID of pipe and flanges. Bolt holes to be ¼ inch oversized.

INSULATION SPECIFICATIONS:

The table below indicates recommended insulation thickness.

Nominal Pipe Size

NPS

(inches)

Recommended minimum Thickness of Insulation (inches)*

Temperature Range (oC)

50 - 90 90 - 120 120 - 150 150 - 230

Temperature Range (oF)

120 - 200 201 - 250 251 - 305 306 - 450

Hot Water Low Pressure

Steam

Medium Pressure

Steam

High Pressure

Steam

< 1" 1.0 1.5 2.0 2.5

1 1/4" - 2" 1.0 1.5 2.5 2.5

2 1/2" - 4" 1.5 2.0 2.5 3.0

5" - 6" 1.5 2.0 3.0 3.5

> 8" 1.5 2.0 3.0 3.5

2. SOW calls for pressure reducing valves to be 250# flange. However, the valve sizes are all under 2”. Are NPT connections acceptable?

Govt Response:

NPT connections are not acceptable.