Engineering Data/FAQs
Equipment Condition
No matter what type of equipment you are trying to seal, the condition of the equipment is critical to the success of the packing. Garlock recommends:
Valves
Longitudinal scores on the valve stem are not to exceed 1/32" depth and/or a depth to width ratio greater than 1.00".
Stem finish no greater than 32 (micro inches) AARH.
Stuffing box finish is recommended to be 125 (micro inches) AARH.
Valve stem warpage / run-out must be checked and found not to exceed:
Stem diameter
|
Run-Out |
|
| to and include 1.500" (38.1 mm) |
+/- .010" TIR/ft. |
| 1.501" to 3.000" (38.1 mm to 76.2 mm) |
+/- .020" TIR/ft. |
| 3.001" (76.2 mm) and above |
+/- .040" TIR/ft. |
Bottom of the gland follower should be flat. If box bottom is beveled, Garlock recommends the use of a system-compatible braided packing ring to be installed before the bushing.
Stuffing box should contain no burrs on the stem and/or box bore walls.
Pumps
Runout: TIR (Total Indicator Runout) not to exceed .005".
No longitudinal scores present on pump shaft or sleeve.
| Shaft Range |
Recommended Cross Section(CS) |
| 5/8" to and including 1-1/8" shaft |
5/16" (7.9mm) |
| 1-1/8" to and including 1-7/8" shaft |
3/8" (9.5mm) |
| 1-7/8" to and including 3" shaft |
1/2" (12.7mm) |
| 3" to and including 4-3/4" shaft |
5/8" (15.8mm) |
| 4-3/4" to and including 12" shaft |
3/4" (19.0mm) |
D=d + (2 x CS)
Recommended Box Depth(L) = (5.5 to 7.5 x CS)
Recommended Surface Finishes:
Stem/Sleeve - 16 to 32 (micro inches) AARH
Box Bore - 125 (micro inces) AARH
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