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PTFE Products
PTFE Lined Products

MATERIAL OF CONSTRUCTION OF LINER

P.T.F.E. :
Polytertrafluoroethylene (-20C to 260C) as per ASTM D 1457

PFA :
Perfluoro (Alkoxy alkane) (-20C to 260C) copolymer as per ASTM D 3307

MFA :
Metafluoro (Alkoxy alkane) (-20C to 240C) copolymer as per ASTM D 3307

FEP :
Perfluoro (Ethylene Propylene) (-20C to 205C) copolymer as per ASTM D 2116


COEFFICIENT OF THERMAL EXPANSION
For Steel ----- 1.1 x 10 -5
For P.T.F.E ----- 13 x 10 -5

Proper manufacturing parameters provide a lined pipe with dimensional stability under Pressure and Thermal cycling conditions, without which liner buckling and cracked flarings could occur within operational limits.


LINER THICKNESS
Fluoropolymer lined pipes and fittings are available in heavy duty as well as in standard thickness. The heavy duty lining is desirable for -

bulletIt's resistance to permeation.
bulletVacuum service condition in the large bore sizes.
bulletAnd is excellent for abrasive slurry service.


INDUSTRIAL APPLICATION
A.Chemical and Petrochemical plants,

a. Chloro - Alkali Industries
b. Pharmaceuticals
c. Pulp and Paper
d. Steel, Metal pickling
e. Fertilizer, Agrochemicals and Pesticides
f. Petroleum and Plastics
g. Water treatment and Wastewater management, Explosives
h. Nuclear Energy and Power Generation etc.

PROCESS OF PTFE LINING
1) Batch wise supply of resin is analyzed in the laboratory for conformance to the applicable specifications.

2) The liner is extruded under controlled conditions at pre-determined dimensional standards and visually inspected. Programmed Sintering of the liners in a specially designed oven, ensure quality liners.

3) The liner is drawn through a sizing die at a controlled rate and installed in the steel shell precisely fabricated as per standard specification.

4) A specially designed relaxing process is used to get a liner snug fit into the shell, to avoid undesirable stresses in the finished product.

5) Both ends of the spool piece are now flared in a controlled manner to eliminate cracking at the neck of flaring.

The finished product is then hydrostatically and / or electro statically tested and visually inspected for any defect.

The specially designed stress relieving process, gives lined items a characteristic, by which expansion and contraction of both liner and shell are nearly equal and hence buckling and cracking of the liner is avoided.

LINING PROCESS OF PFA / MFA / FEP
To avoid thinning of the liner section at the strategic point of branching and to get rid of one extra joint, fittings other than Elbows can be supplied with liner made from PFA/MFA/FEP as per service requirements.

PFA/MFA/FEP being a thermoplastic material with a well-defined melting point can be processed using the injection moulding process. This method enables precise wall thickness to be maintained with tolerance of 0.5 mm.

PFA/MFA/FEP polymers have equivalent Thermal, Chemical and Physical properties with

bulletSuperior process ability
bulletPermeation resistance
bulletAnd strength

Using a locking grid or groove, injection moulded items are relatively more vacuum resistant at higher temperatures.

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