The Unique Process
Pipes:
The lining process for Pipes positively locks the plastic liner in the metal pipe housing while effectively relieving stresses that could cause unwanted liner movement in service.
The liner is processed under controlled conditions to a size somewhat larger than the I.D. of the steel housing into which it will be installed. It is then thoroughly inspected for conformance to specifications.
Next, the liner is subjected to a battery of quality tests designed to ensure liner integrity.
The liner is then drawn through a sizing die at carefully controlled draw rates which results in a calculated reduction in the outside diameter.
A programmed heating cycle relaxes the liner inside the steel housing, resulting in a snug liner fit.Design allowances are incorporated in this procedure to eliminate undesirable stresses in the finished product.
Both liner ends of the pipe spool are then hot flared. Temperature, time and pressure are carefully monitored.
The finished pipe is then tested in accordance with ASTM F1545 standards.
This unique lining process provides lined pipe with dimensional stability under vacuum, pressure, and
thermal cycling conditions, which prevents liner buckling and cracked flares within operational limits.
Fittings: All fittings are lined by automated Transfer/Injection moulding process. Our in house tooling
facility insures uniform lined wall thickness.
Lining Materials
LINING MATERIAL
|
TECHNICAL NAME
|
MAX. WORKING TEMPERATURE
|
PTFE |
POLYTETRAFLUOROETHYLENE |
250 Deg C |
PFA |
PERFLUOROALKOXY |
250 Deg C |
PVDF |
POLYVINYLIDENEFLUORIDE |
150 Deg C |
PP |
POLYPROPYLENE |
100 Deg C |
HDPE |
HIGH DENSITY POLYETHYLENE |
70 Deg C |
Industry Standard Liner Coloration:
PTFE: White
PFA : Natural - off white
PVDF: Black
PP : Orange or Grey
HDPE: Black
Fabrication: Pipe and Fittings Tolerances:
Dimension
|
Tolerance, in.
|
Length and Centerline Dimensions |
± 1/ 8" |
Fixed Flange Bolt Hole Alignment |
± 1 / 16" |
Flange Perpendicularity
(with Pipe Center line) |
3/32 in/ft. of nom. Pipe diameter |
Material Specification
Item
|
Material
|
Specifications
|
Remarks
|
Pipes |
Carbon steel |
ASTM A 106 Sh.40
or
IS 1239
(Medium Duty) |
Pipe will have one end lose and other end fix flange.
Flange as per IS 2062 drilled to ANSI B16.5 Class 150 |
Reducer |
Carbon steel |
A 234 Gr. WPB Sh.40 |
Reducer will have both ends fixed flange Flange
as per IS 2062 drilled to ANSI B16.5 Class 150 |
Tee |
Carbon steel |
ASTM A 106 Sh.40
( Fabricated from Pipe) |
Tee will have all ends fixed flange
Flange as per IS 2062 drilled to ANSI B16.5 Class 150 |
Elbow |
Carbon steel |
A 234 Gr. WPB Sh.40 |
Elbow will have both ends fixed flange
Flange as per IS 2062 drilled to ANSI B16.5 Class 150 |
Inspection and Tests
Hydrostatic Pressure Test: All Piping products are tested for 150 % of maximum recommended working
pressure. Test pressure reaches in 1 minute and maintained for 3 minutes.
Electrostatic Test: All Lined products are tested with non-destructive high voltage tester at an output
voltage of 10 Kv. to detect lining integrity or pin holes.
Visual Inspection: All finished products are visually inspected for any spots or cracks.
External Finish: All pipe and fittings are coated with Red Oxide OR as per customer specifications with
an extra cost.
Note: Other customer-specified coatings are available. Upon review of the data sheets of the requested
paints, however, Uni Polymers reserves the right to decline quoting customer-specified coatings based on
MOC content, manufacturing incompatibility, or other factors.
Note: Normal shipping and handling can cause paint damage that requires touch-up at the job site. Costs
associated with paint touch-up are for Buyer's account.