Dixon Oil Field Products Catalog - Hydraulic Hose

PROCEDURES
Procedure 1000
Boss Clamp Selection
1. Measure the hose ID (Inside Diameter).
2. Measure the hose free OD (Outside Diameter) with a diameter tape. Free OD is measured before the stem is inserted.
3. On the Boss clamp page in the Boss couplings section of the current DPL (Dixon Price List) locate the Hose ID column.
4. Locate the section in that column that corresponds with the hose ID.
5. From that section, select the clamp with a hose OD range (Hose OD From/To columns) that best fits the hose OD just
measured.
a. For steam hose, select the clamp that has a maximum range (To column) as close to the measured hose O.D. as possible.
This will allow the clamp to be re-tightened many times to adjust for Cold-Flow which speeds up with increased temperature
and/or hot/cold cycles.
b. For hard wall constructed hose (wire present) with an OD at or near the clamp’s maximum range (To column), use of the
next largest clamp may be required.
c. For soft wall constructed hose (no wire present) having an OD at or near the clamp’s minimum range (From column), use
of the next smallest clamp may be required. Select the proper clamp based on material requirements.
6. Select the proper clamp material based on the environmental compatibility requirements.
Procedure 2000
Installation of Boss 2-Bolt Clamp
1. Insert shank into hose.
2. Place the stem in a vise:
a. For male stems, tighten the vise on the hex.
b. For female stems (wing nut), place a spud in the vise, tighten, and then thread the wing nut onto the spud.
3. Position the clamp gripping fingers behind the stem collar.
4. Tighten the bolts by hand until there is equal thread engagement. When hose OD is at or near clamp maximum range,
starting of nuts on bolts may require squeezing clamp halves in a vise.
5. Using a torque wrench tighten bolts to the recommended torque value listed in the current DPL. Torque values are based
upon "dry bolts". Lubricant on bolts will adversely effect clamp performance.
Bolt tightening sequence:
a. Front bolt, 1 full turn.
b. Opposite side front bolt, 1 full turn.
c. Repeat "a" and "b" until all bolts are tightened. Clamp bolts are designed to bend during tightening. This "bending"
allows the clamp to conform to the hose circumference.
6. Inspect results using Procedure 3000 (Criteria for Sufficient Fit of a Boss Clamp) and Procedure 3001 (Bolt
Clamp Inspection).
7. Test assembly using Procedure 4000 (General Hydrostatic Testing Information) and 4001 (Hydrostatic Testing Procedure).
Procedure 2001
Installation of Boss 4-Bolt Clamp
1. Insert shank into hose.
2. Place the stem in a vise:
a. For male stems, tighten the vise on the hex.
b. For female stems (wing nut), place a spud in the vise, tighten, and then thread the wing nut onto the spud.
3. Position the clamp gripping fingers behind the stem collar.
4. Tighten the bolts by hand until there is equal thread engagement. When hose OD is at or near clamp
maximum range, starting of nuts on bolts may require squeezing clamp halves in a vise.
5. Using a torque wrench tighten bolts to the recommended torque value listed in the current DPL. Torque values are based
upon "dry bolts". Lubricant on bolts will adversely effect clamp performance. Bolt tightening sequence:
a. Back bolt, 1 full turn.
b. Front bolt, 1 full turn.
c. Snug by hand, nuts on opposite side of bolts just tightened.
d. Opposite side back bolt, 1 full turn.
e. Opposite side front bolt, 1 full turn.
f. Snug by hand, nuts on opposite side of bolts just tightened.
g. Repeat "a" to "f" until all bolts are tightened. Clamp bolts are designed to bend during tightening. This "bending" allows
the clamp to conform to the hose circumference.
6. Inspect results using Procedure 3000 (Criteria for Sufficient Fit of a Boss Clamp) and Procedure 3001 (Bolt Clamp
Inspection).
7. Test assembly using Procedure 4000 (General Hydrostatic Testing Information) and 4001 (Hydrostatic Testing).
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Installation and Inspection procedures may be viewed in full on the Dixon website, www.dixonvalve.com.
A printed copy of the complete Installation and Inspection Procedures Manual is available upon request.
Dixon, 877.963.4966