The Naylor Hathernware HT (Thermal Shock Resistant) Sleeve system of DN100, 150, 225 and 300 plain-end specially formulated clay pipes and fittings with Band-Seal couplings, was developed for hot washing process drainage and is beneficial in many types of industrial processing, where frequent large changes in temperature are expected. HT pipe systems are manufactured to comply with the stringent requirements of BS EN295-1.

When installed in general accordance with the Naylor Sitework Instruction Booklet the Naylor HT Sleeve system meets the latest technical requirements of the Building Regulations Approved Document H and BS EN295-1.

Description

Clayware
Specially formulated thermal shock resistant clay plain-end pipes and fittings, manufactured in accordance with the requirements of BS EN295-1. The standard lengths of pipes are convenient for handling and laying to allow for flexible joints at sufficiently frequent intervals to enable the pipeline to withstand settlement or other ground movement after installation.

Couplings

HT Sleeve Couplings
Manufactured in high impact polypropylene with elastomeric seals providing watertight, flexible mechanical joint assemblies, complying with BS EN295-1: System G. Coloured yellow for easy identification on site.

Band-Seal Chemical Couplings
Elastomeric Sleeve - Manufactured in high grade EPDM or Nitrile elastomers conforming to EN681-1.

Clamping Bands - Manufactured in a high corrosion resistant austenitic stainless steel to EN10088. Where external contamination demands a higher quality stainless this can be supplied to order.

Fluoropolymer Liner - A one-piece seamless FEP element located within the elastomeric sleeve. Expanded PTFE secondary seals ensure a leak tight joint between the FEP and the pipe. For the best results and to ensure a close fit between the liner and the pipe the FEP liner is heat shrunk on site. The liner and seal are chemically inert and solvent resistant to virtually all chemicals.

Joint Performance
Hathernware joint assemblies meet all the requirements of BS EN295-1. They accept angular deflection and shear resistance without leakage, when tested under an internal or external water pressure of 50kPa (5metres head).

Aggressive Environments
Naylor HT is suitable for handling sudden changes in effluent temperatures frequently experienced in boiler blowdown drains, bottle washing or sterilisation areas in the dairy, food or drinks industries. In addition when used in conjunction with Band-Seal Chemical Couplings, HT pipes and fittings may be used to handle aggressive discharges.

Specification
The following statement is a suitable clause for inclusion in contract specification:

Pipes and Fittings

High temperature resistant chemical clayware plain-ended pipes and fittings (HT Sleeve as manufactured by Naylor Hathernware, Clough Green, Cawthorne, Barnsley).

Availability
Hathernware HT Sleeve is available directly from the manufacturer. Contact the Hathernware Technical Department for details: 01226 794028 / 794033 / 794074.

Structural Performance
Naylor Hathernware HT Sleeve pipes can usually be laid directly on a hand trimmed natural trench bottom with selected, excavated materials (Class D Bedding) used as backfill. In case of contaminated land, contact the Naylor Hathernware Technical department on 01226 794028 / 794033 / 794074.

Crushing Strengths
BS EN295-1 includes a variety of crushing strengths for each nominal size of pipe as it takes into account the strength requirements in various parts of Europe. As it is impracticable for any single manufacturer to offer pipes and fittings in the full range of strengths, Naylor Hathernware has standardised on the strengths shown in the table below.

Pipe Nominal Size (DN)	Crushing Strength kN/m	Standard Length (metres)
100	34	1.5
150	40	1.75
225	45	1.25
300	72	1.25

Range
A full system is offered from DN100 to DN300 with an extensive range of fittings, including bends, junctions and tapers, particularly suitable for industrial drainage applications.

Naylor Hathernware HT Sleeve system can be used in conjunction with other Naylor underground and with other above-ground systems. Connections are made by using purpose made connectors and adaptors or by use of Band-Seal couplings.

Pipe Trench Beddings
Depths of cover between which Naylor Hathernware HT Sleeve pipes conforming to BS EN295-1 can be laid, in any width of trench, are found in the Naylor Drainage Design Handbook.

Advantages
It is a major advantage of the Naylor Hathernware HT Sleeve system that the plain-end pipes can be quickly and easily cut to intermediate lengths on site and can still be jointed using Band-Seal Chemical Couplings. This feature retains the ease in jointing, reduces wastage and damage and is particularly cost effective.

Flexibility
The flexible Band-Seal Chemical Coupling joints ensure that the pipeline will accommodate minor settlement and ground movement without failure.

Strength
The specially formulated clay pipes and fittings are rigid and do not distort under loading. Their high inherent strength ensures stability even at extreme depths of cover.

Bedding Economy
Hathernware HT Sleeve pipes can often be laid on the natural, trimmed trench bottom or where not possible on a 50mm bed of inexpensive granular material such as recycled aggregates. As dug material can be used for the backfill, all resulting in significant savings in granular bedding materials.

Chemical Resistance
The Chemical Resistance Chart gives details of the resistance of the HT Sleeve system to a range of chemicals but it is advisable to consult the Naylor Hathernware Technical Department on 01226 794028 / 794033 / 794074 for more specific advice, particularly where temperatures are above ambient or a combination of chemicals are involved.

Durability
The Hathernware HT Sleeve system is extremely durable. For design purposed, a chemical stoneware clay pipeline can be considered to have unlimited life.

Water Jetting
The Hathernware HT Sleeve system, when installed in general accordance with the Naylor Sitework Instructions Booklet is guaranteed for the lifetime of the system against penetration of the pipe wall caused by high pressure water jetting when operated with the following maximum parameters:

Pressure - 7500psi (510Bar)

Flow rate - 20gals/min (1.5Ltrs/sec)

Time - Static for 5 minutes

Pipe Lengths and Delivery
Naylor Hathernware HT Sleeve Pipes are supplied in easy-to-handle lengths. They are delivered in convenient packs with optional mechanical offloading equipment available on the delivery vehicle.

Easy Cutting
Where shorter lengths of pipe are required, pipes may be easily cut on site.