Caddy Controls — Heater Wizard

Flow Conditions

All six flow-condition fields are required. Enter your temperatures; 40°F is a suggested default, not an entered value.

Peak flow scfh

Max inlet P1_max psig

Min inlet P1_min psig

Outlet P2 psigPressure after regulation

Inlet temp T1 °F

Outlet target T2 °F

Gas specific gravity

Compressibility Z

JT coefficient °F/psi

Ambient / Bath

Ambient design temp °F

Wind speed mph

Bath temp °F

Insulation thickness in

Glycol type

Glycol concentration vol %

Burner efficiency %

Design margin %

Burner capacity and preliminary dimensions are calculated automatically from the heating duty, efficiency, coil selection, and allowable wall heat flux.

Required burner capacity

Shell length T/T ft

Shell OD in

Firetube OD in

Awaiting required flow conditions.

Automatic sizing basis & limits

Shell length: coil-required straight length plus 18 in total clearance and return-bend projections, rounded up to 6 in. Firetube: smallest listed even NPS (4–24) meeting the bath-duty / allowable-flux area within that length. Burner capacity equals calculated firing input, including efficiency; no additional hidden burner margin is applied. Shell: fit the coil and both firetube legs, then round up to the next even NPS.

Envelope assumptions: 1/4 in shell wall; 1 in side and coil-to-firetube clearance; 1.5 in top clearance; 1.25D coil pitch; 1.5D firetube return radius. Firetube return area is excluded conservatively. Coil routing, supports, actual shell wall, firetube wall/clear bore, flame length, heat-release limits and draft must be reviewed by the burner supplier and fabricator. These are not certified dimensions.

Nominal pipe and outside-diameter reference

Coil Selection

Pipe NPS

Schedule

Flange class

Paths (parallel circuits)

Passes per path

Bend radius R/D

Coil base U Btu/hr·ft²·°F

Firetube duty flux Btu/hr·ft²

180° bend Le/D

Include bend surface in HT area

Duty & Firing

ΔT_JT @ P1_max–

ΔT_JT @ P1_min–

Gas duty (net worst)–

Gas duty (design)–

Shell heat loss–

Bath duty (Q_bath)–

Firing rate: –Btu/hr

Coil

Selected pipe–

OD / ID–

Gas outlet temp (worst)–

LMTD–

Required area A–

Area breakdown–

Straight length required–

Bend arc length–

Total welded pipe–

Number of 180° bends–

Velocity @ P1_min–

Velocity @ P1_max–

Erosional V_e @ P1_min–

ΔP @ P1_max–

ΔP @ P1_min–

Coil-in-shell geometry

Arrangement–

Straight length required–

Straight length provided–

Return-bend envelope–

Row width across shell–

Coil OD (single-plane tube layer)–

Vertical headroom above tubes–

Min shell OD to fit–

Layout: passes packed side-by-side in upper shell segment, above firetube centerline; short-radius R/D=1.5 U-bends per typical practice (photo verified). Multi-path splits gas flow in parallel for lower per-pass velocity and ΔP.

Firetube & Shell

Firetube area required–

Selected firetube leg length–

Flux vs industry ref (10,000 Btu/hr·ft²)–

Effective bath‑side U–

NPS 8 required leg (area only)–

NPS 10 required leg (area only)–

Shell size–

Bath fluid–

Recommended mix–

Freeze point–

Bath charge–

Bath U-factor–

–

Flange Check

Selected class–

Rating @ 100°F–

Max operating P1–

–

Bill of Materials — Preliminary Spec

Need a complete package? Carry this heater specification into Fuel Train Wizard, select the BMS there, and submit one combined quote request. Contact details are collected only when you request a quote.

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