Schmidt AmphiBlast 120, Operation And Maintenance Manual

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Copyright © 2019 Axxiom Manufacturing, Inc.
6.5 Manway Cover Installation Procedures (See Figure 6.5(a))
6.5.1. Check that the manway cover, crabs, bolts, and gasket are dimensionally correct for the
size manway weld ring of the pressure vessel.
a) Measure and write down the inside dimensions “A” and “B” of the manway weld
ring. See Figure 6.5(a).
b) Identify the size of the manway assembly by comparing the weld ring measurements
from step “a” to the dimensions shown in Table 6.5(c).
c) Verify that the dimensions of the cover, crabs, bolts, and gasket match the
corresponding dimensions given in Table 6.5(c).
Note: The actual dimensions may
vary by up to 1/4" from those given in Table 6.5(c).
d) Replace any component that is not dimensionally correct. Incorrect dimensions
indicate that the component is part of a different size manway assembly.
The manway assembly is part of a Pressurized Vessel. Use of incorrect manway
components will result in assembly failure. Assembly failure will propel objects causing
serious injury or death.
6.5.2. Once a month inspect the manway gasket for tears, cracks, or other wear. Replace if
necessary.
6.5.3. Once a month inspect the manway weld ring sealing surface inside the vessel. Inspect
the manway cover sealing surface. Both surfaces must be smooth.
6.5.4. Preassemble the bolts through each crab and thread on each nut a couple of turns.
6.5.5. Securely place the gasket on the manway cover fitting it under the Manway Stay
Bracket tabs. The gasket is held in place by the tabs. Refer to Figure 6.5(b).
6.5.6. Fit the cover with gasket through the manway opening.
6.5.7. Place the cover and gasket in position against the inside edge of the manway weld ring
with the long tab of the Manway Stay Bracket at the bottom of the weld ring as shown
in Figure 6.5(a) Front View. Apply a pulling force to hold in position then proceed.
6.5.8. The Manway Stay Bracket centers the gasket and cover over the manway weld ring.
Rotate the cover left or right until the long tab of the Manway Stay Bracket is level
horizontally.
6.5.9. Slide each manway crab w/bolt into cover bracket slot until the bolt bottoms at the
inside edge. Loosely tighten each nut. See Figure 6.5(a) and 6.5(b).
6.5.10. When all components are centered and the crab bolts are bottomed in the slots, tighten
the nuts and bolts with a wrench until they are snug.
6.5.11. Only after completing all the pre-operation procedures in Section 6.0 and the bulk
abrasive blast vessel is then pressurized, re-tighten the nuts and bolts with a wrench
until they are snug again.
6.5.12. Do not over-tighten the crab nuts and bolts. Over-tightening could bend the crab out of
shape resulting in malfunction of the assembly.
6.5.13. Periodically check for leaks.