Product Overview

The Spirax Sarco BT6-B sanitary balanced pressure thermostatic steam trap is designed to remove condensate from clean and pure steam applications with minimal condensate retention. Typical duties include sterile steam barriers, block and bleed installations, mains drainage, and CIP/SIP of vessels, reactors, and process lines.

Manufactured in 316L stainless steel, the crevice-free BT6-B body incorporates a 15° angled seat to ensure full drainability. The standard element is extremely sensitive to condensate temperature change and is intended to open within approximately 2°C nominal sub-cooling of steam saturation temperature under typical operating conditions. Exact operating performance may vary with pressure, installation, and ambient conditions.

Each trap is individually packaged in an ISO Class 7 clean environment with protective end caps and sealed in a protective plastic bag.

BT6-B Food+

The BT6-B Food+ variant is designed, manufactured, and approved for steam and condensate applications. It complies with EC 1935:2004 Food Contact Materials and EC 2023:2006 on good manufacturing practice for materials and articles intended to come into contact with food.

A list of materials that may directly or indirectly contact foodstuffs is available in the Declaration of Compliance for this product.

Available Types

Type	Capacity
BT6-BL	Low capacity
BT6-BH	High capacity

Surface Finish

Body surface finish is measured to ISO 4287:1997 and ISO 4288:1997:

• Internal surfaces: 0.6 um Ra, 25 micro-inch Ra, ASME BPE SF2
• External surfaces: 1.0 um Ra, 40 micro-inch Ra

Options

• Fixed bleed to ensure fail-open operation
• Mechanical and electropolishing to 0.375 um Ra, 15 micro-inch Ra, ASME BPE SF4

Standards and Certification

The BT6-B has been designed and built in general accordance with ASME BPE and also complies with the requirements of the European Pressure Equipment Directive 2014/68/EU.

The seal part is stated as compliant with:

• FDA CFR Title 21, Paragraph 177.1550
• USP Class VI Biological Reactivity Cytotoxicity Testing In-Vitro <87> and In-Vivo <88>, extracted at 121°C for 1 hour
• ADI Free statement for materials and manufacturing processes
• TSE / BSE Free statement
• Full material lot number traceability

Available certification includes:

• EN 10204 3.1 Full Validation Pack
• EN 10204 3.1 material certification for pressure-retaining parts
• EN 10204 3.1 material certification for wetted parts, including WFI element fill for element spares
• Specific internal surface finish certificate
• Typical internal surface finish certificate
• Certificate of Compliance for FDA, USP Class VI testing statement, and ADI Free statement
• TSE-BSE statement
• EC 1935:2004 Declaration of Compliance
• Declaration of Conformity to BS EN ISO 14644-1:2015 Class 7 Clean Room
• Passivation certificate
• Typical Test Report

All certification and inspection requirements must be stated at the time of order placement and may incur additional cost where stated in the source literature.

Sizes and Pipe Connections

The source literature lists sanitary clamp ended variants and tube ended variants.

Sanitary Clamp Ended Variants

Standard	Issue / Series	Sizes
ASME BPE	Type A	1/2 in, 3/4 in
ASME BPE	Type B	1 in, 1 1/2 in
ISO 1127	1997 Series 1	DN25, DN40
ISO 1127	1997 Variations	DN15, DN20
DIN 32676	2001-02 Series 2	DN15, DN20, DN25, DN40
DIN 32676	2009-05 Series A	DN15, DN20, DN25, DN40
DIN 32676	2009-05 Series B	DN8, DN10, DN15, DN20, DN25, DN32, DN40
DIN 32676	2009-05 Series C	1/2 in, 3/4 in, 1 in, 1 1/2 in

Tube Ended Variants

Standard	Issue / Series	Sizes
DIN 11866	2016-11 Series A	DN15, DN20, DN25, DN40
DIN 11850	1999-01 Series 2	DN15, DN20, DN25
ISO 1127	1997 Series 1	DN15, DN20, DN25, DN40

Notes

1. Consult the SSP list for available types. For other connections, consult Spirax Sarco.
2. BT6-B Food+ is available with ASME BPE connections.

Materials

No.	Part	Material	Standard / Notes
1	Body (inlet)	Stainless steel	316L (1.4404)
2	Body (outlet)	Stainless steel	316L (1.4404)
3	Capsule element	Stainless steel	-
4	Safety clamp	Stainless steel	316 (1.4401)
5	Seal	PTFE / stainless steel composite gasket	PTFE + 316L (1.4404)

Pressure / Temperature Limits (ISO 6552)

The product must not be used in the shaded region. The product should not be used in the additional restricted region, as damage to the internals may occur.

For hygienic and sanitary clamp ends, the maximum pressure and temperature may be restricted by the gasket or sanitary clamp used. Spirax Sarco advises consulting them for the final limit of the assembled installation.

Parameter	Value
Body design condition	PN10
PMA Maximum allowable pressure	10 bar g @ 140°C
TMA Maximum allowable temperature	177°C @ 9.2 bar g
Minimum allowable temperature	-10°C
PMO Maximum operating pressure for saturated steam service	6 bar g
TMO Maximum operating temperature	165°C @ 6 bar g
Minimum operating temperature	0°C
Maximum cold hydraulic test pressure	15 bar g

Capacities (in accordance with ISO 7842)

The capacity chart uses the following references:

• A: DN25, DN32 and DN40
• B: DN20
• C: DN8, DN10 and DN15
• D: DN25, DN32 and DN40
• E: DN20
• F: DN8, DN10, DN15, DN20, DN25, DN32 and DN40
• G: DN8-BL, DN10-BL, DN15-BL, DN20-BL, DN25-BL, DN32-BL, DN40-BL, DN8-BH, DN10-BH, DN15-BH

The legend identifies:

• BH dashed line: cold water capacity
• BH solid line: hot water capacity
• BL: low capacity
• BH: high capacity
• BL and BH: sizes common to both capacity versions

Dimensions and Weights

Tube ended variants are available in DIN 11866, DIN 11850 and ISO 1127 standards. Sanitary clamp ended variants are available in ASME BPE, ISO 1127 and DIN 32676 standards.

Variant	Sizes	A	B	C	D	E	Weight
ASME BPE Types A and B, ISO 1127, DIN 32676 Series 2 + A + C sanitary clamp ended variants	1/2 in (DN15), 3/4 in (DN20), 1 in (DN25), 1 1/2 in (DN40)	65	64	71.5	77	61	1 kg maximum
DIN 32676 Series B sanitary clamp ended variants	DN8, DN10, DN15, DN20, DN25, DN32, DN40	65	64	71.5	77	61	1 kg maximum
DIN 11866 Series A, DIN 11850 Series 2, ISO 1127 Series 1 tube ended variants	DN15, DN20, DN25, DN40	92	64	71.5	77	61	1 kg maximum

Safety Information, Installation and Maintenance

For full details see Installation and Maintenance Instructions IM-P180-31 supplied with the product.

Installation Note

The BT6-B is designed to be installed in vertical lines with the flow downwards so that the body is self-draining. Check the flow arrow on the body for correct orientation. Fittings and pipe clamps are not supplied.

Installation should include a suitable cooling leg to avoid condensate back-up into process equipment under normal operating conditions.

Do not expose the capsule element to superheat conditions. Handle all components carefully to avoid damage to surfaces.

Operation

The trap operates by means of a stainless steel capsule filled with a WFI temperature sensing fluid. During cold or start-up conditions the capsule is fully open, allowing large volumes of air, condensate, and CIP fluid to be drained. As the system approaches steam temperature the fluid in the capsule expands and the valve closes the trap to prevent live steam loss.

This closure occurs very close to steam temperature to ensure efficient drainage of the system.

Spare Parts

The available spare parts are detailed below. No other parts are supplied as spares.

Available spares	Item No.
Capsule element assembly	3, 5
Seal	5
Body (outlet) including seat	2

How to Order Spares

Always order spares by using the description given in the column headed "Available spares" and state the size and type of trap.

Example: 1 - Capsule element assembly for a 1/2 in BT6-BH sanitary balanced pressure thermostatic steam trap.

Ordering Information

Example: 1 off Spirax Sarco 1/2 in BT6-BH sanitary balanced pressure thermostatic steam trap with self-draining body. Connections to be sanitary clamp ends to meet the requirements of ASME BPE. Suitable for pressure up to 6 bar g. Internal surface finish to be electropolished to 0.375 um Ra (15 micro-inch Ra, ASME BPE SF4). Material certification to EN 10204 3.1 for pressure containing parts.