Specification checklist

Tubing Bundle Data Sheet: What to Specify for a Quote

A heat traced or pre-insulated tubing bundle is built for one duty, so the quotation is only as good as the data behind it. This checklist lists every item Techwin International needs to design an electrical traced, steam traced or pre-insulated bundle, and why each one matters. Fill in what you know; anything left blank is agreed with our engineers before the design is fixed.

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1. Process tubes and fluid

Item	What to give	Why it matters
Number of process tubes	One, two or more tubes in the same bundle	Sets the bundle diameter, the heat load and the bend radius
Tube outside diameter and wall	Imperial (1/8″–3/4″) or metric (6–12 mm), with wall thickness	Must match the fittings at the tap and at the analyser or transmitter
Tube material	SS 316/316L seamless or welded, copper, PTFE, FEP or PFA	Decided by the fluid, the pressure and the sample purity needed
Fluid and phase	Gas, vapour or liquid; composition; dew point or freezing point if known	Sets the lowest temperature the line must hold
Design pressure	Normal and maximum pressure in the tube	Confirms the tube material and wall thickness

2. Temperatures

Item	What to give	Why it matters
Maintain temperature	The temperature the fluid must stay at or above, in °C or °F	Selects the heat source and, for electric bundles, the cable type
Maximum exposure temperature	The hottest condition the line can see, including steam-out or purge	The cable and insulation must survive it without damage
Lowest and highest ambient temperature	Site design minimum and maximum, and wind exposure if known	Sets the heat loss the bundle must replace
Personnel protection	Whether the outer jacket must stay below a touch-safe temperature	Affects insulation thickness and type

3a. Electrical traced bundles

Supply voltage at site
Length of each circuit, or the route length from power point to end
Cable preference, if any: constant wattage, self-regulating or power limiting
Temperature control and monitoring wanted (thermostat, controller, sensor)
Power connection, splice and end-seal kits required

3b. Steam traced bundles

Steam pressure and temperature available
Heavy tracing (tracer touching the tube) or light tracing (separated)
Tracer material and size: copper or stainless steel
Where condensate will be removed along the route
Pre-insulated bundles need no heat source: say so and give the fluid temperature

4. Area classification

Only for electrical bundles in classified areas. The heating cable is the certified item; see the hazardous-area guide for how zones, gas groups and T-classes work.

Zone (or Class / Division) along the route
Gas group or dust group
Temperature class required (T1 to T6)
Certification scheme the project requires: IECEx, ATEX or another national scheme

5. Insulation, jacket and environment

Tube, insulation and outer jacket are built to the project requirement. Describe the site and any material rules, and we propose the construction.

Outdoor exposure: sunlight (UV), rain, marine or coastal air
Chemicals, oils or abrasion the jacket will meet
Jacket material rules in the project specification, for example flame-retardant or halogen-free
High process temperatures: fibre glass suits most duties; aerogel is used above 400 °C (752 °F)
Jacket colour or marking requirements, if any

6. Lengths, ends and documents

Length of each bundle, and the number of bundles of each type
Supply form: continuous coil or straight lengths
How each end terminates: at the analyser, transmitter, sample probe or manifold
Accessories: end seals, entry seals, junction boxes
Documents the project requires with the supply, for example material certificates, test reports or data sheets
Delivery destination and the date you need the bundles on site

How to send it

Send the filled checklist, the project data sheet or a marked-up P&ID with the route lengths through the quote form or to sales@techwin.in. Partial data is fine: our engineers fill the gaps with you before the design is fixed.

For a standard product you can also build the part number in the online configurator, and attach it to your request.

Frequently asked questions

What information is needed to quote a heat traced tubing bundle?

The essentials are the number, size and material of the process tubes, the maintain and maximum exposure temperatures, the lowest ambient temperature, the heat source (electric supply voltage or steam pressure), the run lengths and, in classified areas, the zone, gas group and temperature class.

What is the difference between maintain and exposure temperature?

Maintain temperature is the temperature the fluid must be kept at or above. Maximum exposure temperature is the hottest the bundle will ever see, for example during steam-out. The heating cable and insulation must be chosen for both.

Can I ask for a quote without complete data?

Yes. Send what you have, such as a data sheet or a marked-up drawing. Techwin engineers agree the missing values with you before the bundle design is fixed.

Ready to send your data?

Send the checklist, a data sheet or a drawing with route lengths. Our engineers will review it and come back with a bundle proposal.