Ashcroft 311, 312 Specifications
Data Sheet
311/312 All-Welded Midi Threaded Seals
FEATURES
All-welded construction
No gaskets or bolts
Large diaphragm allows for use with 4½˝ gauges
Compact and light weight alternative to larger seals
TYPICAL USES
Oil and Gas
Refineries
Chemical and Petrochemical
Water and Wastewater
NACE Compliant Processes (Sour Gas Separation)
Biogas and Biodiesel
312/311
Threaded Seal
SPECIFICATIONS
Connection style: 311: All-Welded
312: All-Welded with flushing connection
Process Connection: 311: ¼ to 1 NPT Male or Female
312: ¼ or ½ NPT Female
Instrument Connection: ¼ or ½ NPT Female
Fill Fluid: See table 1 on page 2
Approvals: CRN
WETTED COMPONENTS
Diaphragm Bottom Housing
316L SS, Hastelloy® C-276, Tantalum 316L SS, Hastelloy® C-276
NON-WETTED COMPONENTS
Top Housing
316L Stainless steel
KEY BENEFITS
• Protects instruments from corrosive media
• Stainless top housing stands up to corrosive
environments
• Prevents pressure instruments from clogging
All speci fications are subject to change without notice.
All sales subject to standard terms and conditions.
©2019 Ashcroft Inc. 311-312_midi_ds1.0, Rev. A, 04/19
ashcroft.com
info@ashcroft.com
1.800.328.8258
1 of 4
Data Sheet
311/312 All-Welded Midi Threaded Seals
TABLE 3 - FILL FLUIDS
Fill Fluid Temperature
Viscosity
(cSt at 70ºF (21ºC))
Glycerin (food grade) 0°F to 400°F (-18°C to 204°C) 1,300 CG
50 cSt Silicone -40°F to 500°F (-40°C to 260°C) 50 CK
10 cSt Silicone -40°F to 500°F (-40°C to 260°C) 10 DJ
Halocarbon® 4.2 -70°F to 300°F (-57°C to 199°C) 4.2 CF
Slytherm® 800 -40°F to 750°F (-40°C to 400°C) 10 HA
Variation
Code
Notes
Direct-mounting only. Not for use with vacuum service
For use with oxygen/
oxidizing process media
High temperature applications
Syltherm® XLT -150°F to 500°F (-100°C to 260°C) 1.4 CC
Calflo® AF -20°F to 600°F (-29°C to 316°C) 60 KF
Mineral Oil 10°F to 400°F (-12°C to 204°C) 75 MY
Neobee® M-20 (food grade) 5°F to 400°F (-15°C to 204°C) 9.5 NM
Silicone (food grade) -40°F to 500°F (-40°C to 260°C) 350 CZ
Distilled Water 40°F to 185°F (4°C to 85°C) 0.9 FJ
50/50 Glycerin/Water 15°F to 200°F (-9°C to 93°C) 30 GH
Propylene Glycol -50°F to 325°F (-46°C to 163°C) 54 CV
Ethylene Glycol 20°F to 325°F (-7°C to 163°C) 14 FK
50/50 Ethylene Glycol/Water -25°F to 190°F (-32°C to 88°C) 2.9 CT
80/20 Glycerin/Water 15°F to 225°F (-9°C to 107°C) 270 GR
95/5 Water/Propylene Glycol 40°F to 185°F (4°C to 85°C) 1.0 PY
Low temperature applications
High temperature, silicone-free
All speci fications are subject to change without notice.
All sales subject to standard terms and conditions.
©2019 Ashcroft Inc. 311-312_midi_ds1.0, Rev. A, 04/19
ashcroft.com
info@ashcroft.com
1.800.328.8258
2 of 4
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