|Description / Abstract
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API 570 covers inspection, rating, repair, and alteration
procedures for metallic and fiberglass reinforced plastic (FRP)
piping systems and their associated pressure relieving devices that
have been placed inservice.
The intent of this code is to specify the in-service inspection
and condition-monitoring program that is needed to determine the
integrity of piping. That program should provide reasonably
accurate and timely assessments to determine if any changes in the
condition of piping could possibly compromise continued safe
operation. It is also the intent of this code that owner-users
shall respond to any inspection results that require corrective
actions to assure the continued safe operation of piping.
API 570 was developed for the petroleum refining and chemical
process industries but may be used, where practical, for any piping
system. It is intended for use by organizations that maintain or
have access to an authorized inspection agency, a repair
organization, and technically qualified piping engineers,
inspectors, and examiners, all as defined in Section 3.
API 570 shall not be used as a substitute for the original
construction requirements governing a piping system before it is
placed inservice; nor shall it be used in conflict with any
prevailing regulatory requirements. If the requirements of this
code are more stringent than the regulatory requirements, then the
requirements of this code shall govern.
The term non metallics has a broad definition but in this code
refers to the fiber reinforced plastic groups encompassed by the
generic acronyms FRP (fiberglass-reinforced plastic) and GRP
(glass-reinforced plastic). The extruded, generally homogenous
nonmetallics, such as high and low-density polyethylene are
excluded. Refer to API 574 for guidance on degradation and
inspection issues associated with FRP piping.
Included Fluid Services
Except as provided in 1.2.2, API 570 applies to piping systems
for process fluids, hydrocarbons, and similar flammable or toxic
fluid services, such as the following:
a) raw, intermediate, and finished petroleum products;
b) raw, intermediate, and finished chemical products;
c) catalyst lines;
d) hydrogen, natural gas, fuel gas, and flare systems;
e) sour water and hazardous waste streams above threshold
limits, as defined by jurisdictional regulations;
f) hazardous chemicals above threshold limits, as defined by
g) cryogenic fluids such as: LN2, LH2,
LOX, and liquid air;
h) high-pressure gases greater than 150 psig such as: GHe,
GH2, GOX, GN2, and HPA.
Optional Piping Systems and Fluid Services
The fluid services and classes of piping systems listed below
are optional with regard to the requirements of API 570.
a) Fluid services that are optional include the following:
1) hazardous fluid services below threshold limits, as defined
by jurisdictional regulations;
2) water (including fire protection systems), steam,
steam-condensate, boiler feed water, and Category D fluid services,
as defined in ASME B31.3.
b) Other classes of piping systems that are optional are those
that are exempted from the applicable process piping construction
Fitness-For-Service and Risk-Based Inspection
This inspection code recognizes Fitness-For-Service concepts for
evaluating in-service damage of pressure-containing components. API
579 provides detailed assessment procedures for specific types of
damage that are referenced in this code. This inspection code
recognizes RBI concepts for determining inspection intervals. API
580 provides guidelines for conducting a risk-based assessment.
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