Meriam 70H_72H High Pressure Wet Tap Accutubes with Integral 3-Valve Head and Optional RTD - Manual (Page 27)

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TABLE 5
ACCUTUBE PRESSURE/TEMPERATURE LIMITATIONS
ACCUTUBE SERIES
MAXIMUM
PRESSURE AT TEMPERATURE
PSIG (3)
°F
10A/11A Steel, brass & copper 250 250 max
316 SS 1000 750 max
20T/21T 1500
250
100
400 max
22L/23L, 40H/41H, 42H/43H 1500 800 max
24D/25D(1) 150 # flange 285 100
33T(2) 150 190 max
37L, 70H, 72H (2) 1000 400 max (4)
(1) Pressure / temperature on flanged series are governed by the flange rating. Flange rating
options have higher capacity.
(2) Wet tap assembly rating is also limited by insertion valve rating.
(3) Consult factory where pressure or temperature exceeds either allowable maximum.
(4) For maximum temperature up to 800º F, request welded cage pipe to packing assembly joint.
Standard unit used Teflon tape and limits temperature to 400º F
6 INTERCHANGEABILITY
6.1 Accutube flow sensors can be conveniently interchanged between different measuring
points.
6.1.1 Accutubes can be used to measure any type of fluid (liquid, gas and steam). The
fluid must be compatible with the probe material and must be single phase.
Multi-phase fluids such as gases with a significant amount of entrained liquids
or liquids with significant entrained gases may not be accurately measured.
6.1.2 Any Accutube can be interchanged between pipes as long as the inside
diameters are the same and the pressure rating of the probe and/or valves are not
exceeded. The sensing port spacing is designed for specific inside pipe
diameter. Use of the Accutube in pipe with the inside diameter different from
its design inside diameter will result in measurement errors.
6.2 Packing Fitting Reusability
The packing fitting can be made and remade a number of times, however, the
compression ferrule becomes permanently crimped onto the Accutube probe
shaft after the first assembly. The ferrule is not removable. The ferrule can be
assembled into different fitting bodies of the same make.