API RP 574:2009 pdf download

API RP 574:2009 pdf download.Inspection Practices for Piping System Components.
3.1.29
pressure design thickness
Minimum pipe wall thickness needed to hold design pressure at the design temperature as determined using the rating code formula.
NOTE Pressure design thickness does not include thickness for structural loads, corrosion allowance or mill tolerances.
3.1.30
repair
A repair is the work necessary to restore a piping system to a condition suitable for safe operation at the design conditions.
3.1.31
rerating
A change in either or both the design temperature or the maximum allowable working pressure of a piping system.
NOTE A rerating may consist of an increase, decrease, or a combination. Derating below original design conditions is a means to provide increased corrosion allowance.
3.1.32
risk-based inspection
RBI
A nsk assessment and management process that is focused on inspection planning for loss of containment of pressurized equipment in processing facilities, due to material deterioration.
NOTE These risks are managed primarily through inspection in order to influence the probability of failure.
3.1.33
small-bore piping
SBP
Pipe or pipe components that are less than or equal to NPS 2.
3.1.34
soil-to-air interface
SIA interface
An area where increased external corrosion can occur on partially buried pipe and where buried piping begins to extend above ground.
NOTE The zone of the corrosion will vary depending on factors such as moisture, oxygen content of the soil and the operating temperature. The zone generally is considered to be from 12 in. (30 cm) below to 6 in. (15 cm) above the soil surface. Pipe running parallel with the soil surface that contacts the soil is included.
3.1.35
spools
A section of piping encompassed by flanges or other connecting fittings, such as unions.
3.1.36
strip lining
Strips of metal plates or sheets that are welded to the inside of the pipe wall.
NOTE Normally, the strips are of a more corrosion-resistant or erosion-resistant alloy than the pipe wall and provide additional corrosion/erosion resistance.
4.1.2.7 FRP piping is manufactured in many ways. Every service application should be reviewed for proper resin, catalyst, corrosion barrier (liner) composition, and structural integrity. Although FRP is considered to be corrosion resistant, using the wrong resin or corrosion barrier can be a cause for premature failure. FRP pipe can experience ultraviolet (UV) degradation over time if not adequately protected. Adding a UV inhibitor in the resin will help prevent premature fiber blooming caused by UV. The user should consider this option for all FRP piping applications and be aware that this would be a supplemental specification.
4.1.2.8 All FRP piping should be inspected by a person that is knowledgeable in the curing, fabrication and quality of FRP materials. The level of inspection should be determined by the user. ASME RTP-1, Table 6-1, can be used as a guide to identify liner and structure imperfections that are common in FRP laminates. Standardized FRP piping systems commonly called “commodity piping” are manufactured for a variety of services and are sold as products with a predetermined design, resin, corrosion barrier and structure. The piping manufacturers typically have a quality control specification that identifies the level of quality and allowable tolerance that is built into their product. Custom fabricated pipe is typically designed and manufactured for a specific application. The resin, catalyst system, corrosion barrier and structure are specified and the pipe is manufactured to a specification and to a specified level of quality and tolerances.
4.1.2.9 The FRP inspector should verify by documentation and inspection that the piping system has been built with the proper materials, quality, hardness and thickness as requested in the pipe specification. A final inspection should be performed at the job site to insure that the pipe has not experienced any mechanical damage during shipment.
4.1.3 Small-bore Piping (SBP)
SBP can be used as primary process piping or as nipples, secondary, and auxiliary piping. Nipples are normally 6 in. (152 mm) or less in length and are most often used in vents at piping high points and drains at piping low points and used to connect secondary/auxiliary piping. Secondary piping is normally isolated from the main process lines by closed valves and can be used for such functions as sample taps. Auxiliary piping is normally open to service and used for flush lines, instrument piping, analyzer piping, lubrication, and seal oil piping for rotating equipment.