Advantages of “Close Hook-Up” style vs off-the-shelf 

“End Connected” gages are:

•  More visible glass length for established vessel centers

•  Permits use of gage valves with spherical union vessel connections, for much greater

flexibility during fit-up…. the spherical joint overcomes misalignment of fittings, reduces

mechanical stress in piping, insures leak tight joint when a conventional flat union

connection fails to close the gap… useful on horizontal vessels without bridles,

where nozzles are planted “on the hillside” and difficult to plumb.

Choose the row with the largest “Vessel C-C” 

that is equal to or less than the actual vessel 

C-C. Read left for “Gage Size”. Designate 

“CH”  as in R100-39 CH, T100-14 CH etc-

or if preferred  use nine-letter suffix system

Order by gage size and actual vessel center 

to center. No need to specify Gage Port C-C. 

Actual vessel centers are required by Inferno 

before manufacture.

Extended Gage Port centers are available to 

match any longer vessel center to center.

Dimensions shown are for gages with 1/2” F-NPT ports. Add 

3/8”  for gages with 3/4” F-NPT ports.

Inferno gage valves: 15A, FT15, FT25,  have 3/4” internal 

offset same as Brand “P” but different from 7/8” in other 

brands.

Offsets Inside vs Outside vs Parallel… Inferno gage valves 

include a 3/4” offset as shown. When the valves are 

configured w offsets “Outside” add 3” to the “Vessel C-C’ . If 

valves can be assembled with offsets “Parallel” add 1-1/2” to 

dimension shown. For illustrations of four ways see Inferno 

Drawing A111517.