ASME RTP-1:2005 pdf download Reinforced Thermoset Plastic Corrosion Resistant Equipment
1-210 Service Restrictions
(a) When a vessel is to be used in a critical serviceit shall be the responsibility of the User or the User’sdesignated Agent to declare such in the UBRS.
(b) This Standard provides generalized guidelines tohelp the User or User’s Agent in determining when avessel should be declared to be in critical service. How-ever, the User or User’s Agent has sole authority andresponsibility for such declaration. Any such declarationmade is not a function of the scope, requirements, orcontent of this Standard, or of any firm or individual(other than the User or User’s Agent) involved in anypart of the process of using or determining proper useof the Standard.
(c) Critical service should be declared when theoperating environment complies with all of the following conditions specified in (1) through (4) or the condition specified in (5):
(1) operating pressure within the vessel is equal toor exceeds +5 psig and
(2) vessel is located in close proximity to areas frequented by personnel on a regular basis such that abruptfailure of the vessel would be likely to threaten the lifeor health of personnel and
(3) substance contained in the vessel is of suchnature that if abruptly released it could threaten the lifeor health of personnel and
(4) substance contained is known by the User orUser’s Agent to degrade the physical strength propertiesof the RTP laminate at an abnormally high rate or
(5) substance contained is known by the User tobe an insidious and extremely poisonous gas or liquidof such a nature that a very small amount of the gas orof the vapor of the liquid mixed or unmixed with air isdangerous to life when inhaled, or of such a nature thata very small amount of the substance in contact withthe body may be absorbed and cause a toxic reaction thatis dangerous to life. By insidious is meant the substance isof such nature that exposure to the substance mightresult in a discomfort level not sufficient to warn ofpotentially severe and irreversible damage to an individ-ual’s health.
(d) Quantities in the system, concentrations, pressuretemperature, the nature of the environment, substance properties such as flammability and toxicity, and thepotential for environmental pollution should also beconsidered by the User or User’s Agent in order to determine whether a critical service should be declared
1-220 Critical Service Requirements
(a) When a User or User’s Agent has declared in theUBRS that a vessel is to be used in critical service, thefollowing shall apply:
(1) Regardless of operating or design pressure, allvessels declared to be in critical service must be subected to a Proof Test of the as-constructed laminate.Refer to para.6-930(d).
(2) The vessel shall be specified, fabricated,andinspected to be in full compliance with Level 1, CriticallyCorrosion Resistant,visual inspection criteria asdescribed in Table 6-1.
(3) Design factors of safety for the physical strengthproperties of the laminate shall be at least 125% of thosespecified elsewhere in this Standard. Greater design factors mav be warranted based on analysis of the expectedoperating conditions and such factors as are outlined inpara. 1-210(d). If so, they shall be specified by the Useror User’s Agent.
(4) Acoustic emission testing of RTP vessels hasbeen found useful in identifying major defects. Its useas an additional verification of integrity for vessels tobe used in critical service is optional.(5) Postcure of critical service essels is optionalbut should be given consideration Postcure of RTP lami-nates is known to improve certain mechanical propertiesof the laminate and reduce residual styrene content, andmay improve the corrosion resistance of the laminateOther mechanical properties, such as elongation, maybe reduced by postcure.
Consultations with the resin manufacturer and Fabricator should be conducted, and where postcure is to beemployed,a specification defining procedures, methodsand a time-temperature program shall be specified bythe User.
(b) Compared to steel, RTP materials have the follow-ing characteristics: