DCN for Vacuum pod tops and bases: D047822-v6, D047823-v6, D0900859-v4, D0900860-v3, D0900649-v4, D0900650-v3

Changes generally made at request of fabricator to facility manufactureability. 


D047822-v6 L4C Base
- chagned bottom of flange flatness to .002", from .001"
- Changed top of flange flatness to .004", from .001"
- Changed tol on tapped flange hole to .014" only, others remian .010"
- Removed Datum C.  Tolerance call-outs have be changed to conform to the "simultaneous requirement" condition laid out in ASME Y14.5. Thus Datum C can be removed without removing the features relationship.
"In the 1994 ASME standard, this is spelled out in paragraph 5.3.6.1 (or 7.5.4.1 of the 2009 edition):  "Where multiple patterns of features are located relative to common datum features not subject to size tolerances, or to common datum features of size specified on an RFS basis they are considered to be a single pattern."


D047823-v6 L4C Top
- Changed flange flatness tol to .005" from .001"
- Added note 22 for tubing to flange welds.
- Removed note 17 from tubing to flange welds
-  Removed Datum C.  Tolerance call-outs have be changed to conform to the "simultaneous requirement" condition laid out in ASME Y14.5. Thus Datum C can be removed without removing the features relationship.
"In the 1994 ASME standard, this is spelled out in paragraph 5.3.6.1 (or 7.5.4.1 of the 2009 edition):  "Where multiple patterns of features are located relative to common datum features not subject to size tolerances, or to common datum features of size specified on an RFS basis they are considered to be a single pattern."


D0900859-v4 GS-13 Top
- Changed .002 flatness to a composite tolerance of .002" circular runout, and a total runout of .006
- Changed full penetration part of note 17 to: "FULL PENETRATION IF: TUBING TO TUBING, OR TUBING TO THIN WALL."
- Removed Datum C.  Tolerance call-outs have be changed to conform to the "simultaneous requirement" condition laid out in ASME Y14.5. Thus Datum C can be removed without removing the features relationship.
"In the 1994 ASME standard, this is spelled out in paragraph 5.3.6.1 (or 7.5.4.1 of the 2009 edition):  "Where multiple patterns of features are located relative to common datum features not subject to size tolerances, or to common datum features of size specified on an RFS basis they are considered to be a single pattern."



D0900860-v3 GS-13 Base
- Removed Datum C.  Tolerance call-outs have be changed to conform to the "simultaneous requirement" condition laid out in ASME Y14.5. Thus Datum C can be removed without removing the features relationship.
"In the 1994 ASME standard, this is spelled out in paragraph 5.3.6.1 (or 7.5.4.1 of the 2009 edition):  "Where multiple patterns of features are located relative to common datum features not subject to size tolerances, or to common datum features of size specified on an RFS basis they are considered to be a single pattern."


D0900649-v4 Trillium Top
- Changed 7.00" dim on Zone H-1, 2 sheet 2 to +/-.040”
- Changed Positional on tapped holes to .014”
- Fixed note 6 problems: removed incorrect notation, added new note 17 where appropriate.
- Removed Datum C.  Tolerance call-outs have be changed to conform to the "simultaneous requirement" condition laid out in ASME Y14.5. Thus Datum C can be removed without removing the features relationship.
"In the 1994 ASME standard, this is spelled out in paragraph 5.3.6.1 (or 7.5.4.1 of the 2009 edition):  "Where multiple patterns of features are located relative to common datum features not subject to size tolerances, or to common datum features of size specified on an RFS basis they are considered to be a single pattern."


D0900650-v4 Trillium Base

- Changed Flatness Zone A-1 to .002”
- Changed Positional Zone B-5, C, D-7, 8 to .002”
- Removed Datum C.  Tolerance call-outs have be changed to conform to the "simultaneous requirement" condition laid out in ASME Y14.5. Thus Datum C can be removed without removing the features relationship.
"In the 1994 ASME standard, this is spelled out in paragraph 5.3.6.1 (or 7.5.4.1 of the 2009 edition):  "Where multiple patterns of features are located relative to common datum features not subject to size tolerances, or to common datum features of size specified on an RFS basis they are considered to be a single pattern."