311 ASHCROFT | Alldatasheet
Document overview
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Technical content
FEATURES
All-welded construction No gaskets or bolts Large diaphragm allows for use with 41/2˝ 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 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 KEY BENEFITS
- Protects instruments from corrosive media
- Stainless top housing stands up to corrosive environments
- Prevents pressure instruments from clogging WETTED COMPONENTS Diaphragm Bottom Housing 316L SS, Hastelloy® C-276, Tantalum 316L SS, Hastelloy® C-276 NON-WETTED COMPONENTS Top Housing 316L Stainless steel All specifications 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 4 311/312 All-Welded Midi Threaded Seals Data Sheet
Fill Fluid Temperature Viscosity (cSt at 70ºF (21ºC)) Variation Code Notes Glycerin (food grade) 0°F to 400°F (-18°C to 204°C) 1,300 CG Direct-mounting only. Not for use with vacuum service 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 For use with oxygen/ oxidizing process media Slytherm® 800 -40°F to 750°F (-40°C to 400°C) 10 HA High temperature applications Syltherm® XLT -150°F to 500°F (-100°C to 260°C) 1.4 CC Low temperature applications Calflo® AF -20°F to 600°F (-29°C to 316°C) 60 KF High temperature, silicone-free 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 All specifications 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 4 311/312 All-Welded Midi Threaded Seals Data Sheet
ORDERING CODE Example: 02 312 S S 02T XCK NH Process Connection Size 02 - ¼ NPT Male (available for 311 only) 02 04 - 1/2 NPT Male (available for 311 only) 06 - ¾ NPT Male (available for 311 only) 08 - 1 NPT Male (available for 311 only) 25 - ¼ NPT Female 50 - 1/2 NPT Female 75 - ¾ NPT Female (available for 311 only) 10 - 1 NPT Female (available for 311 only) Seal Type 311 - Threaded All-welded midi seal no flushing port 312 - Threaded All-welded midi seal with flushing port 312 Diaphragm Material S - 316L Stainless steel S U - Tantalum H - Hastelloy® C-276 Bottom Housing Material S - 316L Stainless steel S H - Hastelloy® C-276 Instrument Connection Size 02T - ¼ NPT Female 02T 04T - 1/2 NPT Female Options (if choosing an option(s) must include an “X”) X__ Fill Fluid (See Table 1 on page 2 for more available fill fluids) CK - 50 cSt Silicone CK Optional Features PU - Pipe plug for flushing connection (plug will match bottom housing material; 312 seal only) NH - Stainless steel instrument NH DU - Instrument welded to seal (instrument must be of like-material to top housing) MQ - Positive material identification W1 - Dye penetrant testing 6B - Cleaned for oxygen service All specifications 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 3 of 4 311/312 All-Welded Midi Threaded Seals Data Sheet
DIMENSIONS in [ ] are millimeters For reference only, consult Ashcroft for specific dimensional drawings A TYPE 311 MIDI-SEAL MALE NPT PROCESS CONNECTION C B TYPE 311 & 312 MIDI-SEAL – THREADED (with and without flushing connection) C D A B Bottom of Housing to C of 1/8 NPT Flushing Port (Type 312 only) L Model A B C D 311 (male connection) 2 [51] 13⁄8 [35] 1¾ [44] - 311/312 MIDI DIAPHRAGM SEAL -THREADED (WITH & WITHOUT FLUSHING CONNECTION) 311MIDI DIAPHRAGM SEAL -THREADED MALE PROCESS CONNECTION All specifications 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 4 of 4 311/312 All-Welded Midi Threaded Seals Data Sheet