Does anyone has a definition of wha

[JB23]

Does anyone has a definition of what makes a pressure container an integral part of a rotating mechanical device? If you encapsulate a rotating mechanical device is the container automatically excluded from code requirements?

 

[bmoorthy]

Are you refering to Vessel containing (Encapsulating) Agitator/Srirers? Or is the querry regarding jackets of Pump Body.

 

[chicopee]

By code requirement, if you are suggesting legal inspections than the pressure container that you are referring to is not used for storage of a fluid and therefore not subject to legal inspections since it is a process piece of equipment.

 

[JB23]

Maybe some further explanation of the receiver is in order. Oil-flooded rotary compressor systems utilize air/oil receivers for oil separation and recovery. In most large systems the air/oil receiver is separate from the compressor (connected by pipes, tubes, fittings, etc.). However, in small compressor systems the compressor often is mounted inside the air/oil receiver (encapsulated) to economize space, pipes, fittings, etc. The function of the air/oil receiver is the same in both large and small systems, except that in the smaller systems the compressor and receiver have a common flange. The reciever will be subjected to maximum system pressure as oil is removed from the air and the air is delivered to the customer.

So, is the encapsulated version excluded from code requirements based on the integration of the air/oil receiver and the compressor (U-1(c))? Or can the same argument apply to separate air/oil receivers?

 

[chicopee]

Air-oil separators of rotary compressors are not subject to annual egal inspections eventho they may be constructed per ASME code VIII.

 

[JB23]

chicopee, please further explain the annual legal inspections. If the air-oil separators of rotary compressors are not subject to annual legal inspections are the separators required to be constructed per ASME code VIII?

 

[apiguy]

If you look at the dimensions of what is classified as a pressure you will find you smaller vessel will not meet this requirement.

There are many reason things are constructed to the ASME code. One is safety. Even though items may be constructed in accordance with the "principles" of the ASME code they will not have an ASME code stamp.

The APIGUY....

 

[twjag]

For your case, the compressor housing would be exempt per U-1(c)(2)(c). The air/oil receiver would not be exempt per this paragraph.
Though the receiver may be a "functional" part of the system, the receiver is not a "functional" part of the compressor. The compressor "function" does not rely upon the receiver. The fact that the receiver can function whether encapsulating the pump (as per your described arrangement), or external to the pump, fails the criteria that the component be a "functional requirement" "of the device".

 

[chicopee]

Legal inspections are done by either State or insurance boiler and pressure vessel inspectors in accordance w/ State boiler and pressure vessel code. All states in the USA have such laws.The objects that are inspected include boilers and pressure vessels for storage of compressed air. Of course the fired and unfired pressure vessel codes have exemptions based on size, working pressure, heat input. Such inspections are for the protection of the public.