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An ASME U Vessel Stamp signifies that the vessel was made to the standards stated in Section VIII Division 1 by the American Society of Engineers. A U2 Vessel Stamp means it meets the standards for Section VIII Division 2 Alternative Rules.

Q: What is the difference between a U2 stamp and a U stamp?

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U and R stamps are ASME codes certification Stamps, qualifying organisations for the manufacture(ie fabrication) and repair and/or alteration of pressure vessels-in line with ASME boiler and pressure vessel codes(check ASME IX, ASMEViii Div 1). The U stamp is for fabrication of pressure vessels and the R stamp is for repair and/or alteration of pressure vessels. These are stamped on the finished work signifying complete compliance with the code requirements. (Contribution from Michael Obinna Okoye odu-Nigeria)

An ASME "U" stamp designates a vessel as a "pressure vessel" as defined and regulated by ASME codes

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The shape one looks like a "J" the other looks like a "U". They are actually referred to as J & U Bends.

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normally U2 to be get after increasing the ability of manufacturers for pressure vessel (P<3000 psi) that have U stamp. but it is possible for U2 in same time normally U2 to be get after increasing the ability of manufacturers for pressure vessel (P<3000 psi) that have U stamp. but it is possible for U2 in same time normally U2 to be get after increasing the ability of manufacturers for pressure vessel (P<3000 psi) that have U stamp. but it is possible for U2 in same time

u2 - 2u +1 = u2 - u - u + 1 = u*(u - 1) - 1*(u - 1) = (u - 1)*(u - 1) = (u - 1)2

The LCM is u3 + 8u2 - u - 8u2 - 1 = (u -1)(u + 1)u2 + 9u + 8 = (u + 8)(u + 1)Thus, the LCM = (u - 1)[(u + 1)(u + 8)] = (u - 1)(u2 + 9u + 8).

The expression comes from sequences. Given a sequence U1, U2, U3, ... the first differences are (U2 - U1), (U3 - U2), (U4 - U3) and so on.If you consider these as the sequence V1, V2, v3, ... then the second differences in U are the first differences in V. So the second diffs are:V2 - V1 = (U3 - U2) - (U2 - U1) = U3 - 2*U2 + U1V3 - V2 = (U4 - U3) - (U3 - U2) = U4 - 2*U3 + U2, and so on.

U l r d2 l2 d l2 u5 l2 u2 r u r2 d2 u3 r2 d2 l r u2 l2 d2 u2 r4 d2 l3 r u2 l2 d l2 d l d2 r2 d5 r2 u l d l u4 d3 r4 u2 l u l2 r d2 u r2 d2 l3 d l u2 d r2 u3 r u3 r2 u2 l2 d5 l d3 r2 u2 l r d2 l2 u2 r u l

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U2

Level 26 (S=spacebar) U2,L3,D,L3,D,R,U,R2,U2,R2,D,R2,D,R2,U2,L2,U,L6,D,L3,D3,S,U3,L6,D,L3,D3,U2,R,U, L,D,R,U,R2,U2,R2,D,R2,D,R2,U2,L2,U,L4,D5,R3,S,U3,L4,D5,R2,L

Level 15 (S=Spacebar) R4,U2,S,U5,R3,U2,R4,D2,U2,R2,S,L2,R,L3,U,R,D,L2,U,R,D,L3,D,L3,D4,L,U,R,D,R7

Level 25 U,R,D,L,U,R,D,L2,U,R4,U2,L2,U,R,L,D,R2,D2,L4,D,R2,U,R3,U2,R3,U,L,D,R,U2,L,D,R, U,R,D,L

U2 was named after the U-2 spy plane.

Level 20 (S=spacebar) D,L,D,R,D,L,U2,R,U2,L4,D2,R,U,L2,D3,L,D,U,R,U2,R,U2,R3,D3,L,U,S,L,U,D,R,S,L5, D5,R5,D