CR-4, Type CR Weld-on Sight Glass

Size 4 in
101.6 mm
Outer Diameter (O.D.) 4 in
101.6 mm
Inner Diameter (I.D.) 3.0 in
76.2 mm
Dimension T 1.000 in
25.4 mm
Dimension T1 0.75 in
19.1 mm
Outer Diameter 2 (O.D.2) 6.75 in
171.4 mm
Factory Mutual Approved factory-mutual-approved-and-registered-in-canada
Ferrule Material1 ASME SA-351
ASTM A312 304 S/S & 316 S/S
ASTM A519 - 1026
Tubular Steel
Weld Pad Material2 PVQ plate
Stainless Steel ASME SA-240 304-L
Stainless Steel ASME SA-351
Sealing Gasket Material PTFE
Rubber
Operating Temperature 450 ºF
232 ºC
Tolerance ± 0.0025 in
± 1/64 mm
Note 1 Lens ferrule assembly may be furnished separate.
2 Steel Ring Flange and cap screws furnished with Weld Pad.
  1. Gasket set furnished with complete unit and lens ferrule assembly.
  2. Available with flat or contoured studding outlets.
  3. Ferrule available in Carbon or Stainless Steel.
Safety Factor at 150 psi 12.7
Safety Factor at 140 psi 13.4
Safety Factor at 130 psi 14.5
Safety Factor at 120 psi 15.7
Safety Factor at 110 psi 17.1
Safety Factor at 100 psi 18.8
Safety Factor at 90 psi 20.9
Safety Factor at 75 psi 25.1
Safety Factor at 60 psi 31.4
Safety Factor at 45 psi 41.8
Safety Factor at 30 psi 62.7

CR: Replacement for annular edge glass.