ASME B29.8:2002 pdf free download

ASME B29.8:2002 pdf free download.LEAF CHAINS,CLEVISES, AND SHEAVES.
NOTE: Chains from ditTerent manufacturers must never be Placed together within the same application.
1.5 Minimum Ultimate Tensile Strength (M.U.T.S.)
Minimum Ultimate Tensilc Strength (M.U.T.S.), for chain covered by this Standard, is the minimum force at which an unused, undamaged chain could fail when subjected to a single tensile loading Lest.
(a) WARNING: The Minimum Ultimate Tensile Strength is 110! a “working load.” The M.U.T.S. greatly exceeds the maximum force that may he safely applied to the chain.
(b) Test Procedure: A tensile force is slowly applied, in a uniaxial direction, to the ends of the chain sample.
(c) The tensile test is a destnictive test. Even though the chain may not visibly fail when subjected to the Minimum Ultimate Tensile Strength, it will have been damaged and will be unfit for service.
1.6 Tolerance for Chain Length
New chains may have a tolerance of ±0.031 in./ft (2.58 mm/rn) when measured under standard measuring load as outlined in para. 1.7.
1.7 Measuring Load
This is the load under which a chain is to he measured for length. It is equal to 1% of the minimum ultimate tensile strength. Length measurements are to be taken over a length of at least 12 in. (300 mm).
1.8 Preload
All chains shall be preloaded by applying a tensile force equivalent to at least 30% of the Minimum Ultimate Tensile Strength given in Table 2.
2 CLEVISES
This section gives recommended design dimensions of terminal devises for use with Type B leaf chains. Limiting dimensions herein established are for the purpose of ensuring acceptance of chains built in accordance with foregoing standards.
2.1 Design Considerations
Care must be exercised in the manufacture and attachment of devises to ensure equal load distribution across the chain. Failure to do so will seriously reduce the chain load-carrying capacity.
It is recommended that the material used for the construction of devises be through-hardening steel.
The devises and pins used to anchor the chain shall he of adequate strength to withstand at least the breaking load of the chain.
2.2 Clevis Types
The clevis may be designed so that the clevis block fits inside the end plates of the chain, or so that the clevis block fits outside the end plates of the chain, as illustrated in Fig. 4.