API 580 Risk Based Inspection

API 580 Risk Based Inspection RBI


API 580:

The primary work products of the  API 580 Risk Based Inspection RBI assessment and management approach are plans that address ways to manage risks on an equipment level. These equipment plans highlight risks from a safety/health/environment perspective and/or from an economic standpoint. RBI plans should include cost-effective actions along with a
projected risk mitigation.
Implementation of these plans provides one of the following:
a) an overall reduction in risk for the facilities and equipment assessed,
b) an acceptance/understanding of the current risk.
The  API 580 Risk Based Inspection RBI plans also identify equipment that does not require inspection or some other form of mitigation because of the acceptable level of risk associated with the equipment’s current operation. In this way, inspection and maintenance activities can be focused and more cost effective. This often results in a significant reduction in the
amount of inspection data that is collected. This focus on a smaller set of data should result in more accurate information. In some cases, in addition to risk reductions and process safety improvements,  API 580 Risk Based Inspection RBI plans may result in cost reductions.
API 580 Risk Based Inspection RBI is based on sound, proven risk assessment and management principles. Nonetheless,  API 580 Risk Based Inspection RBI will not compensate for:
c) inaccurate or missing information,
d) inadequate designs or faulty equipment installation,
e) operating outside the acceptable IOWs,
f) not effectively executing the plans,
g) lack of qualified personnel or teamwork,
h) lack of sound engineering or operational judgment.

1.What is design ?

The act of working out the form of some thing (as by marking a sketch or out line or plan )

 2.What is design interpretation?

Design interpretation means to interpret or under stand the drawing.

3. Introduction to pressure vessel

Several types of equipment, which are used in the chemical, petrochemical fertilizer industries are described bellow.

  • Pressure vessel
  • Storages vessel
  • Distillation column [i]
  • Heat exchanger
  • Evaporator
  • Reactor, etc.

In all this equipment pressure vessel is a basic and generally used in all     above types of industries.

Pressure vessel are usually spherical or cylindrical with domed ends. They are provide with openings or nozzles with facilities for marking threaded or flanged joints. Various methods are used for supporting the vessel.

4.Definition of vessel

A container or structural envelope in which material are processed, or stored.

5.Definition of pressure vessel

A container or structural envelope in which material are processed, treated, or stored which has been designed to operate at pressure above 15 Psi are knows as pressure vessel.

6.Which codes used make design of pressure vessel?

Various code reference which is used for design and construction of pressure vessel are as below.

  • ASME sec viii div-1
  • IS 2825
  • BIS 5500

 7.Why designing is required for pressure vessel?

The selection of the types of vessel based primarily upon the fictional service of the vessel. The functional service requirements impose certain operating conditions such as temperature, pressure, dimensional limitation and various loads.

If the vessel is not designed properly the vessel may be fail in service. The design of most structure is based on formulas. Formula may be used form any relative code/standards so the value derived form that formula is reliable.

8.Why necessary design of pressure vessel?

If vessel is not designed properly’ the vessel may be fail in service.

Failure may be occur in one or more manners such by the plastic deformation resulting form excessive stress, or by elastic instability.

9.What parameter affect the failure of vessel?

Failure may also result form corrosion, wear or fatigue. Design of the vessel to protect against such as failures involve the consideration of these factors and the physical properties of the materials.

If the vessel is not properly designed then chances of failure is more because we don’t know what is the maximum operating pressure and temperature. We don’t know about maximum load, pressure or temperature carrying capacities of the vessel.

10.Stresses in pressure vessel

Pressure vessel are subjected to various loading which exert stresses of different intensities in the vessel components. The various stresses, which are generating during working and service time, are tabulated below.


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