All Refrigeration Pipework and Associated Fittings Shall Be Insulated to Prevent Condensation

REFRIGERATION SPECIFICATION

01 - General

01 – 01 Scope

All refrigeration pipework and associated fittings shall be insulated to prevent condensation.

Acoustic insulation of engineering service pipe and ductwork to prevent nuisance mechanical service noise shall also be considered.

01 – 02 Standard References

The materials, components and completed installations shall conform to applicable Standards current at the time of tendering.

Relevant standards may include:

BS 476 Fire Tests on Building Materials and Structures.

BS EN 12667 Thermal performance of building materials and products. Determination of

thermal resistance by means of guarded hot plate and heat flow meter

methods. Products of high and medium thermal resistance.

BS 3533 Glossary of terms relating to thermal insulation.

BS 5970 Thermal insulation of pipework and equipment in the temperature range of

-100°C to + 870°C

BS 5422 Method for specifying thermal insulation materials for pipes, tanks, vessels, ductwork and equipment operating within the temperature range -40°C to +700°C.

EN 13501-1 Fire classification of construction products and building elements. Classification using test data from reaction to fire tests.

01 – 03 Services to be Insulated

All refrigeration pipework and associated fittings shall be insulated to prevent condensation. Associated equipment, flanges, fittings and supports shall also be insulated.

Acoustic insulation of engineering service pipe and ductwork to prevent nuisance mechanical service noise shall also be considered.

The installation work shall be carried out by suitably trained insulation contractors who hold TICA membership.

01 – 04 Pipework Clearances

Shall, be sufficient to allow for the full thickness of insulation specified to be applied.

Be sufficient to allow for the application of high density insulated pipe supports between the pipe and any pipe clips or hangers. This will also include provision for acoustic de-coupling materials.

01 – 05 Fire Penetration Sealing

Where service pipework passes through a fire resistant barrier Armaflex Protect R-90 shall be applied to the pipework throughout the penetration. Armaflex Protect R-90 shall be installed as to the manufacturer’s recommendations and to a thickness sufficient to match the fire resistance rating of the wall or barrier.

02 – Materials

02 – 01 General

All insulation materials shall be:-

Obtained, where available from an ISO 9001:2000 “quality systems” and ISO 14001:2004 “environmental systems” certified manufacturer.

Shown to be Formaldehyde free in order not to contribute towards the maximum long term exposure limit of 2 parts per million (as recommended by the HSE).

Shown to inhibit the growth of mould.

All Armaflex materials shall be installed as to the manufacturer’s recommendations using the appropriate Armaflex adhesive:

Product / Appropriate Adhesive
AF/Armaflex Class O / Armaflex 520 Adhesive or Armaflex RS850 Adhesive
HT/Armaflex / Armaflex HT625 Adhesive
Armaflex Ultima / Armaflex Ultima 700 Adhesive or Armaflex Ultima RS850 Adhesive

Insulation installed in locations exposed to weather conditions shall be provided with a suitable weather resistant finish in the form of a covering of Armafinish 99 UV protective paint.

All thermal insulation shall have an ozone depletion potential (ODP) of 0 and global warming potential (GWP) of 0 as required.

The thermal insulation must be CE marked in accordance with the relevant European standard.

All AF/Armaflex Class O shall be manufactured in the UK by Armacell UK Ltd in Oldham.

03 – Insulation

03 – 01 Selection

Shall be:-

For refrigeration pipework

Internal applications

AF/Armaflex Class O elastomeric nitrile rubber with a Class O fire rating when tested under BS 476 Part 6 and BS 476 Part 7 or Armaflex Ultima with at least Euroclass B-s2,d0 fire rating according to EN 13501-1. The thickness of insulation shall be sufficient to prevent condensation under specified conditions. The material shall be CFC and H-CFC free. The material shall incorporate Microban® anti-microbial protection to actively inhibit the growth of mould.

External applications

UV resistant HT/Armaflex elastomeric EPDM rubber. The thickness of insulation shall be sufficient to prevent freezing under specified conditions. The material shall be CFC and H-CFC free.

Or:

AF/Armaflex Class O elastomeric nitrile rubber painted using Armafinish 99 resistant paint.

03 – 02 Thermal Insulation Materials

Material / Temp Range / “K” Value W/mK at mean temp / ODP
Rating / GWP
Rating / Fire Class / Typical material density kg/m3
AF/Armaflex Class O / -50ºC to +110ºC / 0.033 @ 0ºC / 0 / 0 / Class O / To be around 50
HT/Armaflex / -50ºC to
+150ºC / 0.042 @ 40ºC / 0 / 0 / Class 1 / 65
Armaflex Ultima / -50ºC to +110ºC / 0.040 @ 0°C / 0 / 0 / B-s1,d0 / B-s2,d0 / 65

For temperatures down to -200°C contact the insulation manufacturer’s technical department.

04 – Protection and Protective Coverings

04 – 01 Internal Coverings

Shall be:

For AF/Armaflex Class O elastomeric nitrile rubber:

For high level insulated pipework or concealed insulated pipework:

No additional protective covering shall be required.

For exposed pipework at low levels:

Armaflex Tuffcoat or Arma-Chek Silver pre-covered PVC film / laminate or Arma-Chek D woven glass fibre cloth bonded using Armaflex 520 or Armaflex RS850 adhesive with a minimum 50 mm overlap at all longitudinal seams and Arma-Chek D tape used to cover butt joins. Associated equipment, flanges, fittings and supports shall also be insulated. Installation shall be in all cases to the manufacturer’s recommendations.

All excess adhesive visible on the surface of the completed assembly shall be removed using an appropriate cleaning fluid such as Armaflex Cleaner.

04 – 02 External Coverings

Shall be:

For HT/Armaflex:

No covering shall normally be required when using HT/Armaflex outdoors due to the natural

in-built resistance against UV degradation.

For AF/Armaflex Class O elastomeric nitrile rubber:

Either:

UV resistant Armaflex Tuffcoat or Arma-Chek Silver PVC coverings (pre-covered tubes and sheet available). Seams to be bonded using Armaflex 520 or RS850 adhesive and covered using Armaflex Tuffcoat or Arma-Chek Silver tapes respectively (Armaflex Tuffcoat mastic also recommended to provide a watertight seal for outdoor applications). All material shall be overlapped and staggered in such a way as to ensure a watershed is always provided. Installation shall be in all cases to the manufacturer’s recommendations.

All excess adhesive visible on the surface of the completed assembly shall be removed using an appropriate cleaning fluid such as Armaflex Cleaner.

High density rubber cladding of the “Arma-Chek R” type bonded using an appropriate full contact adhesive with a minimum 50 mm overlap at all butt joints and longitudinal seams. A weather proof Arma-Chek mastic sealant shall be applied over all seams and joints. All material shall be overlapped and staggered in such a way as to ensure a watershed is always provided. Installation shall be in all cases to the manufacturer’s recommendations.

All excess adhesive visible on the surface of the completed assembly shall be removed using an appropriate cleaning fluid such as Armaflex Cleaner.

UV resistant “Arma-Chek D” woven glass fibre cloth bonded using an appropriate full contact adhesive with a minimum 50 mm overlap at all butt joints and longitudinal seams. A weather proof mastic sealant shall be applied over all seams and joints. All material shall be overlapped and staggered in such a way as to ensure a watershed is always provided. Installation shall be in all cases to the manufacturer’s recommendations.

All excess adhesive visible on the surface of the completed assembly shall be removed using an appropriate cleaning material.

Armafinish 99 UV resistant paint.

04 – 03 Vapour Barriers

Shall be:

For AF/Armaflex Class O elastomeric nitrile rubber and Armaflex Ultima:

Built into the insulation material. The insulation shall have a moisture resistance factor no

less than 6,000. No additional external water vapour barrier shall be necessary.

For HT/Armaflex:

Built into the insulation material. The insulation shall have a moisture resistance factor no

less than 3,000. No additional external water vapour barrier shall be necessary.

04 – 04 Insulation of Pipework Supports

Shall:-

In all cases have all pipe clips and hangers attached to the outside of the insulation. Metal saddles to be used to prevent crushing of the insulation. Be applied such that pipes are acoustically de-coupled from the building structure. High load bearing pipe supports of the Armafix type shall be preferred and installed to manufacturer’s recommendations.

Be insulated with a thickness sufficient to prevent condensation.

04 – 05 Insulated Valve and Flange Cover Boxes

Shall be manufactured directly from the insulation material itself as according to the manufacturer’s recommendations. The covering of fabricated flange or valve covers shall be as for the insulation on the remainder of the attached service pipes.