WN - Weld Neck Flanges
LJ - Lap Joint Flanges
RJ - Ring Joint Flanges
BW - All Butt Weld Construction
NM - NACE MRO175 / MRO103
DC - Dual Chamber
CL - Low Temp, Cryogenic Insulation
IB - High Temp Insulation Blanket
EH - Eletrical Heat Tracing
FP - Freeze Protection
ST - Steam Tracing
FE - Frost Extension
DV - Drain Valve*
VD - Vent & Drain Valves*
MS - Metric Scale
PS - Percent Scale
VS - Volumetric Scale
AS - 3 1/2" Acrylic Scale
FE - Non Forest Extension
DI - Dual Indication
IF - Interface Indication
AR - Level Arrow Indication
IL - Interface Indication
IG - Indicator Guard
HDC - Heavy Duty Mounting Clamps
HY - Hydrostatic
NDE - 100% Non-destruative Testing (Die Penetration, X-Ray)
PMI - Positive Material Identification
NST - Nonstick Treatment
*Specify Ball or Gate Valve in notes.