GRP pipes and fittings, including preinsulated ones, made of GRP/W and GRP/G laminates.

Pipes and fittings of polyester-glass laminates TWS/W and TWS/G type, including preinsulated ones, are antistatic, slow-burning and non-toxic pipes and fittings made of glass fibre and synthetic resins of polyester group.
Insulation in preinsulated pipes consists of flame-retardant PUR foam and a casing made of flame-retardant, antistatic and non-toxic high density polyethylene (HDPE) pipe or laminate pipe. Pipes and fittings of TWS/W and TWS/G types are made with various ending versions: bare, flanged or with a sleeve for lamination.

Purpose

These products are intended for use in underground mine excavations in methane and non-methane fields, classified as "a", "b" or "c" degrees of methane explosion hazard and class A or B of coal dust explosion hazard, also in shafts. In addition, they can be used in non-pressure installations in surface mine installations and as a structural element of technological ducts, e.g. in shafts or as casing pipes in pre-insulated pipes (GRP/W).

Ranges

Nominal diameter of pressure pipes: from DN 16 to DN 500
Nominal diameter of non-pressure pipes: from DN 16 to DN 4000
Nominal pressure: from PN 2.5 ÷ PN 40
Length of a pipeline section: from 150 mm to 12,000 mm

Construction

GRP/W pipes and fittings

GRP/W pipes and fittings consist of two layers: the main structural layer made of laminate and the outer, flame-retardant, non-toxic and antistatic laminate layer. GRP/W pipes and fittings are suitable for the transport of non-flammable liquids, including aggressive ones, water (wastewater, mine water) as well as suspensions, water solutions, proppant mixture, oil-water emulsions, brine, etc.

Inner linings in GRP/W pipes improve the technical parameters of pipes and fittings in terms of their chemical resistance, abrasion resistance, etc. These linings in GRP/W pipes do not have to be antistatic and do not affect the type of the medium transported.

At the customer’s request, internal linings can be made of materials or pipes approved for use in underground mine excavations.

GRP/G pipes and fittings

GRP/G pipes and fittings consist of three layers: the main structural layer made of laminate and the outer and inner flame-retardant, non-toxic and antistatic laminate layers. GRP/G pipes and fittings are suitable for the transport of compressed air, inert gases, methane, methane in negative pressure in methane drainage installations as well as all the above-mentioned media for the GRP/W type. GRP/G pipes and fittings are also characterized by a cross resistivity not worse than R≤106 Ω/m according to the PN-EN ISO 8031 standard.

Internal linings in GRP/G pipes and fittings must be made of materials or pipes approved for use in underground mine excavations and have an internal and external antistatic, flame retardant and non-toxic layer.

GRP/W and GRP/G pipes and fittings in the pre-insulated version

Pipes and fittings are intended for the construction of pre-insulated pipelines in mining excavations. The basic elements of pre-insulated pipelines are GRP/W or GRP/G line pipes with or without internal linings, HDPE ASTP2/O casing pipes, and thermal insulation made of PUR or GRP/W foam as well as thermal insulation made of PUR foam.

Advantages

Pipes and fittings made of polyester-glass laminates are characterized by temperature stability, increased resistance to abrasion as well as to chemicals, UV rays and corrosion. Thanks to the use of non-flammable resins, it is possible to create a refractory material for use in areas endangered by fire.

These products are also waterproof (they can be installed outdoors) and very durable. An added bonus is the variety of assembly methods, including in underwater and underground installations, open excavations or in trenchless systems.