12/22/2015 Pressure Vessel Definition

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Pressure Vessel Definition

The Pressure Vessel Definition article provides you the definition and boundaries of pressurevessel based API code and ASME Code.

Based on the ASME Code Section VIII, pressure vessels are containers for the containment ofpressure, either internal or external.

This pressure may be obtained from an external source or by the application of heat from a director indirect source, or any combination thereof.

The ASME Code is a construction code for pressure vesselsand contains mandatory requirements, specific prohibitions andnon-mandatory guidance for pressure vessel materials, design,fabrication, examination, inspection, testing, and certification.

Pressure Vessel Definition - Scope

These scopes are based ASME Code Sec VIII Div 1

The vessel with maximum allowable workingpressure(MAWP) higher than 15 psi

Inside diameter to be higher than 152 mm

No piping or piping component

No rotating or reciprocating Equipment

Not Water Vessel up to 300psi or 210°F

Not within the scope of other Sections

Also for gas fired double shell heat exchangers < 50 psi

Not Steam Boilers with direct firing

Not for Human Occupancy (PVHO)

Boundaries

The welding end of the first circumferential joint for welded connections

The first threaded joint for screwed connections

The face of the first flange for bolted, flanged connections

The first sealing surface for proprietary connections or fittings

12/22/2015 Pressure Vessel Definition

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Non pressure parts welded directly to a pressure retaining surface

Pressure retaining covers

Pressure relief devices

What is API Code Definition from Pressure Vessel ?

Contrary of ASME Code Sec VIII, which was developed forconstruction, the API STD 510 covers the in-service inspection,repair, alteration, and rerating activities for pressure vessels.

This inspection code applies to all refining and chemical processvessels that have been placed in service.

What is the API STD 510 coverage?

Vessels constructed in accordance with an applicableconstruction code

Vessels constructed without a construction code (non-code)—A vessel not fabricated to a recognized construction code andmeeting no known recognized standard

Vessels constructed and approved as jurisdictionally special based upon jurisdictionacceptance of particular design, fabrication, inspection, testing, and installation

Non-standard vessels—A vessel fabricated to a recognized construction code but has lost itsnameplate or stamping.