Pressure Relief Devices All pressure vessels should be equipped with one or more pressure safety valves (PSVs) to prevent overpressure. This is a requirement of both the ASME Code and API RP 14C (refer to Chapter 14). The PSV should be located upstream of the mist extractor. If the PSV is located downstream of the […]
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Pressure Vessels Ladder and Platform
Vessel Supports Small vertical vessels may be supported by angle support legs, as shown in Figure 12-11. Larger vertical vessels are generally supported by a skirt support, as shown in Figure 12-12. At least two (2) vent holes, 180° apart, should be provided at the uppermost location in the skirt to prevent the accumulation of […]
Read More…Separator Pressure Vessels Vortex Breaker and Manways
Vortex Breaker As liquid flows out of the exit nozzle, it will swirl and create a vortex. Vortexing would carry the gas out with the liquid. Therefore, all liquid outlet nozzles should be equipped with a vortex breaker. Figure 12-9 shows several vortex breaker designs. Additional designs can be found in the Pressure Vessel Handbook. […]
Read More…Separator Pressure Vessels Nozzles
Nozzles should be sized according to pipe sizing criteria, such as those provided in API RP 14E. The outlet nozzle is generally the same size as the inlet nozzle. To prevent baffle destruction due to impingement, the entering fluid velocity is to be limited as: If an interior centrifugal (cyclone) separator is used, the inlet […]
Read More…Separator Pressure Vessels Shop Drawings
Before the vessel fabrication can proceed, the fabricator will develop complete drawings and have these drawings approved by the representative of the engineering firm and/or the operating company. These drawings are called shop drawings. They will show detailed vessel design and fabrication/welding, nozzle schedules and locations, details of vessel internals, and other accessories. Examples are […]
Read More…Separator Pressure Vessels Specifications
Most companies have a detailed general specification for the construction of pressure vessels, which defines the overall quality of fabrication required and addresses specific items such as: • Code compliance • Design conditions and materials • Design details • Vessel design and tolerances • Vessel connections (nozzle schedules) • Vessel internals • Ladders, cages, platforms, […]
Read More…Estimating Pressure Vessels Weights
It is important to be able to estimate vessel weights, since most cost estimating procedures start with the weight of the vessel. The vessel weight, both empty and full with water, may be necessary to adequately design a foundation or to assure that the vessel can be lifted or erected once it gets to the […]
Read More…Separator Pressure Vessels Inspection Procedures
All ASME Code vessels are inspected by an approved Code inspector. The manufacturer will supply Code papers signed by the inspector. The nameplate on the vessel will be stamped to signify it has met the requirements of the Code. One of these requirements is that the vessel was tested to 1.5 times MAWP. However, this […]
Read More…Determining Separator Pressure Vessels Wall Thickness
The following formulas are used in the ASME Code Section VIII, Division 1 for determining wall thickness: Wall thickness—cylindrical shells Figure 12-1 defines the various types of heads. Most production facility vessels use ellipsoidal heads because they are readily available, normally less expensive, and take up less room than hemispherical heads. Cone-bottorn vertical vessels are […]
Read More…Pressure Vessels Maximum Allowable Stress Values
The maximum allowable stress values to be used in the calculation of the vessel’s wall thickness are given in the ASME Code for many different materials. These stress values are a function of temperature. Section VIII of the ASME Code, which governs the design and construction of all pressure vessels with operating pressures greater than […]
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