Common use of PIPING MATERIALS Clause in Contracts

PIPING MATERIALS. All pipe-work shall be designed, fabricated and tested according to the requirements of the approved standard with the consent of the Purchaser incorporating any other features as required by this Technical Specifications. The material of the piping shall be equal to or better than the following technical requirements. For design metal temperature up to and including 750°F, carbon steel (including plate material) shall be used. For design metal temperature between 750°F and 990°F, Type P22 alloy steel shall be used. For design metal temperature above 990°F, Type P91 alloy steel shall be used. The outside of the embedded pipes shall be protected by coatings. Underground piping systems may use PVC or HDPE pipe where appropriate based on design conditions. Buried steel pipe shall be coated and wrapped and cathodic protection should be considered as required by the soil conditions. Carbon steel bolts for mechanical joints shall be wrapped. Cast iron valves may be used for wastewater, potable water, and fire protection only. Lubricating oil piping shall be made of A53 (ASME) or equivalent material, with Schedule 40 minimum pipe thickness or equivalent standard thickness. Pressure piping shall be of seamless pipe. The pipeline from last filter on the generator oil supply manifold to the generator group connecting point shall be made of stainless steel. The control oil pipeline shall be stainless steel seamless pipe. The cooling water and fire protection water piping shall be made of carbon steel. The pipes used for acids or caustic solutions shall be made of anti-corrosive material. The chlorine piping shall also be of anti-corrosive material. Instrument compressed air piping shall be made of stainless steel. The joints of piping shall be welded and, for thread-type joints, sealed weld shall be applied. Demineralized water pipe shall be made of stainless steel. Piping materials under special conditions shall be as follows: Sodium hydroxide — Stainless steel or semi transparent FRP Hydrochloric acid — Polyvinyl chloride pipe or FRP Other chemicals — Polyvinyl chloride pipe or FRP The materials of the piping leading from drains, vents, and so on to the shutoff valve on the main pipe shall be made of the same material as the main pipe. Potable water piping shall be schedule 80 PVC pipe or HDPE and fittings with bronze valves except for exterior piping in rack shall be schedule 80 A53 galvanized with 3000# cadmium plated A105 threaded fittings. Potable water shall supply safety showers and eyewashes, which shall be furnished for the following locations: Battery room (s) Acid and caustic, ammonia or urea storage tank area(s) Chemical feed storage and metering area All unwrapped and un-lagged pipes outside buildings which are subject to corrosion, in addition to the normal design wall thickness, shall have an additional corrosion allowance that is sufficient to ensure a minimum service life of 30 years and is, in any case, no less than 2 mm. All other pipes shall have a suitable corrosion allowance for 30 years’ service life. Piping shall be so arranged as to provide clearance for the removal of any piece of equipment requiring maintenance with a minimum dismantling of piping and for easy access to valves and other piping accessories required for operation. Overhead piping shall have a minimum vertical clearance of 7 feet 2 inches above walkways and working areas and be of sufficient height above roadways to enable removal of the largest/heaviest equipment from the Facility. All pipe-work shall be fabricated with appropriate connections used for pressure gauges, thermometers and any other corollary device as required by the plant design. Appropriate connections for Performance Test instrumentation shall also be provided. No pipe-work shall be run in trenches carrying electrical cables. Maximum design velocity of fluids through piping shall take into account water hammer, erosion, and pressure drop of fluid in the lines. Double-wall piping with leak detection shall be provided for underground piping containing hazardous chemicals.

PIPING MATERIALS. All pipe-work shall be designed, fabricated and tested according to the requirements of the approved standard with the consent of the Purchaser incorporating any other features as required by this Technical Specifications. The material of the piping shall be equal to or better than the following technical requirements. For design metal temperature up to and including 750°F, carbon steel (including plate material) shall be used. For design metal temperature between 750°F and 990°F, Type P22 alloy steel shall be used. For design metal temperature above 990°F, Type P91 alloy steel shall be used. The outside of the embedded pipes shall be protected by coatings. Underground piping systems may use PVC or HDPE pipe where appropriate based on design conditions. Buried steel pipe shall be coated and wrapped and cathodic protection should be considered as required by the soil conditions. Carbon steel bolts for mechanical joints shall be wrapped. Cast iron valves may be used for wastewater, potable water, and fire protection only. Lubricating oil piping shall be made of A53 (ASME) or equivalent material, with Schedule 40 minimum pipe thickness or equivalent standard thickness. Pressure piping shall be of seamless pipe. The pipeline from last filter on the generator oil supply manifold to the generator group connecting point shall be made of stainless steel. The control oil pipeline shall be stainless steel seamless pipe. The cooling water and fire protection water piping shall be made of carbon steel. The pipes used for acids or caustic solutions shall be made of anti-corrosive material. The chlorine piping shall also be of anti-corrosive material. Instrument compressed air piping shall be made of stainless steel. The joints of piping shall be welded and, for thread-type joints, sealed weld shall be applied. Demineralized water pipe shall be made of stainless steel. Piping materials under special conditions shall be as follows: Sodium hydroxide — Stainless steel or semi transparent FRP Hydrochloric acid — Polyvinyl chloride pipe or FRP Other chemicals — Polyvinyl chloride pipe or FRP The materials of the piping leading from drains, vents, and so on to the shutoff valve on the main pipe shall be made of the same material as the main pipe. Potable water piping shall be schedule 80 PVC pipe or HDPE and fittings with bronze valves except for exterior piping in rack shall be schedule 80 A53 galvanized with 3000# cadmium plated A105 threaded fittings. Potable water shall supply safety showers and eyewasheseye washes, which shall be furnished for the following locations: Battery room (s) Acid and caustic, ammonia or urea storage tank area(s) Chemical feed storage and metering area All unwrapped and un-lagged pipes outside buildings which are subject to corrosion, in addition to the normal design wall thickness, shall have an additional corrosion allowance that is sufficient to ensure a minimum service life of 30 years and is, in any case, no less than 2 mm. All other pipes shall have a suitable corrosion allowance for 30 years’ service life. Piping shall be so arranged as to provide clearance for the removal of any piece of equipment requiring maintenance with a minimum dismantling of piping and for easy access to valves and other piping accessories required for operation. Overhead piping shall have a minimum vertical clearance of 7 feet 2 inches above walkways and working areas and be of sufficient height above roadways to enable removal of the largest/heaviest equipment from the Facility. All pipe-work shall be fabricated with appropriate connections used for pressure gauges, thermometers and any other corollary device as required by the plant design. Appropriate connections for Performance Test instrumentation shall also be provided. No pipe-work shall be run in trenches carrying electrical cables. Maximum design velocity of fluids through piping shall take into account water hammer, erosion, and pressure drop of fluid in the lines. Double-wall piping with leak detection shall be provided for underground piping containing hazardous chemicals.