District heating pipes. Pre-insulated flexible pipe systems - Bonded system with metal service pipes; requirements and test methods1 Scope This European Standard provides requirements and test methods for flexible, pre insulated, directly buried district heating pipe assemblies with metallic service pipes and bonding between the layers of the pipes and thermal insulation materials of polyurethane or polyisocyanurate foam, the casing pipes being made of polyethylene. This European Standard is valid for maximum operating temperatures up to 140 C and pressures up to 25 bar for a

The methods are not applicable to concretes made with lightweight aggregates

it also requires the items detailed in clause 2 to be documented

no restrictions are placed on the choice of the value of the AOQL or on the sizes of successive lots in the series

BS EN 16603-70 may be tailored for the specific characteristics and constraints of a space project in conformance with ECSS-S-ST-00

monitor and control similar characteristics on different items

Classification of risk

which may occur in several forms

BS EN 17110 specifies the tests necessary to verify compliance with the equipment

recommended performance

Self-refrigeration unit

ISO 362-1 specifies an engineering method for measuring the noise emitted by road vehicles of categories M and N under typical urban traffic conditions

The guidance given is aimed at materials manufacturers and convertors