Compliance

TEMA Standards.

The Tubular Exchanger Manufacturers Association (TEMA) Standards describe the classes, the types, and the construction of shell-and-tube exchangers. PlutoHX follows them in each design.

The TEMA type chart: front ends A, B, C, N, and D; shells E, F, G, H, J, K, and X; rear ends L, M, N, P, S, T, U, and W, each with a schematic half section and its name, with A, E and T highlighted as the reference exchanger. — Open the drawing at full size

What PlutoHX follows

Construction to TEMA.

Follows the TEMA standard clearances, baffle arrangements, and floating head designs
Supports Class R (petroleum and related processing), Class C (commercial and general process) and Class B (chemical process)
Supports the standard shell types and the front and rear head configurations

Classes and types

The classes, and every type letter.

An exchanger’s type is three letters: its front end, its shell, and its rear end.

Class R
Petroleum and related processing

Class C
Commercial and general process

Class B
Chemical process

Front end

AChannel and removable cover (the reference exchanger)
BBonnet (integral cover)
CChannel integral with tubesheet, removable cover (removable bundle)
NChannel integral with tubesheet, removable cover (fixed tubesheet)
DSpecial high pressure closure

Shell

EOne pass (the reference exchanger)
FTwo pass, with longitudinal baffle
GSplit flow
HDouble split flow
JDivided flow
KKettle reboiler
XCross flow

Rear end

L, M, NFixed tubesheet, like the A, B and N front ends
POutside packed floating head
SFloating head with backing device
TPull-through floating head (the reference exchanger)
UU-tube bundle
WExternally sealed floating tubesheet

The reference exchanger is type AET.

A construction detail

Pass partition plates.

In a channel with more than one pass, a pass partition plate divides the tube side flow. TEMA asks that it carries the pressure difference between the adjacent passes, and PlutoHX designs it for that.

A channel section with the pass partition plate between the two passes and the pressure difference across it; an end view with the tube field; and the gasket groove detail at the tubesheet face. — Open the drawing at full size

In a design

Where the class and the type are set.

The TEMA class and the TEMA type are part of the general options of every design, beside the exchanger type and the shell type. When a datasheet is parsed, they are imported with the rest of the data: the class, and the letters of the channel, the shell, and the rear head.

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