Admiral Valve Repair And Supply

SINGLE VALVE OTHER THAN UNFIRED STEAM BOILERS:

 

The single valve shall prevent the vessel pressure from rising more than 10% above the maximum allowable working pressure.

 

The valve shall be set to relives at a pressure not to exceed the maximum allowable working pressure of the vessel.

 

Per UG-125, and UG-134.

 

MULTIPLE VALVES ON A VESSEL OTHER THAN UNFIRED STEAM BOILERS:

 

The aggregate capacity of multiple valves connected to any vessel or system of vessels for the release of liquid, air, steam, or other vapor shall be sufficient to relieve the maximum capacity that can be generated or supplied to the attached equipment without permitting a rise in vessel pressure to more than 16% above the maximum allowable working pressure.

 

One valve is to be set at or below the maximum allowable working pressure, the balance of the valves may be set at higher pressures up to, but may not exceed 105% of the maximum allowable working pressure.

 

Per UG-125, UG-133 and UG-134. 

FIRE AND/OR EXTERNAL HEAT PROTECTION OF VESSELS OTHER THAN UNFIRED STEAM BOILERS:

Supplemental valves for the protection from unexpected sources of external heat shall be capable of preventing the vessel pressure from rising more than 21% above the maximum allowable working pressure. 

Multiple valves used to provide protection against excessive pressure caused by exposure to fire or other sources of external heat shall be set to operate at a pressure not in excess of 110% of the maximum allowable working pressure. 

On a single valve installation to protect a vessel, and to provide fire/external heat protection, it shall not be set at a pressure above the maximum allowable working pressure. 

Per UG-125, UG-133 and UG-134 

SET PRESSURE TOLERANCES FOR THE ABOVE:

For pressures of 15 psig up to and including 70 psig, the tolerance shall be +/- 2 psig.

For pressures of 71 psig and above, the tolerance shall be +/- 3%.   

FIRE AND/OR EXTERANL HEAT PROTECTION OF VESSELS HAVING NO PERMANENT SUPPLY CONNECTION AND USED FOR NON-REFRIGERATED LIQUEFIED COMPRESSED GASES:

Valves shall be sized to prevent the pressure from rising more than 20% above the maximum allowable working pressure of the vessel. 

The valve set pressure shall not exceed the maximum allowable working pressure of the vessel. 

Per UG-125 and UG-134 

SET PRESSURE TOLERANCES FOR THE ABOVE:

The set pressure tolerance shall be -0 psig to +10%.