Standard specification for lining ductile iron pipe and fittings sanitary sewer line service
I. Lining Material
The standard of quality for interior liquid epoxy lining shall be a two
component, amine cured novalac epoxy containing a minimum of 20% by
volume ceramic pigmentation. Due to health and environmental concerns, the
lining must be both COAL TAR free (polycyclic aromatic hydrocarbons) and
HAPS free (hazardous air polluting solvents), and no less than 97% solids by
volume. Permox–CTF by Permite Corp., Stone Mountain, GA, meets both
composition and performance standards of this specification. The following
properties are minimum performance test requirements and must be obtained
from 40 mil DFT films of lining material applied to the specified substrate and
certified by the lining manufacturer.
In the event a formulary change is made by the manufacturer subsequent to
the performance testing and certification of the lining material, the new
formulation must be re-qualified. The new product, as related to the
formulary change, is subject to meeting the same composition and
performance standard and must be re-certified by the lining manufacturer.
I. Testing – Physical Properties
- A. ASTM G-95 Cathodic Disbondment shall be not greater
than 0.5mm disbondment, 30 days duration.
- B. ASTM D-4060 Abrasion Resistance shall not exceed a
weight loss of more than 0.30 grams (CS17 Wheel, 1000-
gram load, 1000 cycles).
- C. ASTM D-4541 Adhesion 700 psi minimum.
- D. ASTM D-1653 Permeability, Method A 40-mils free cast
film 30-day duration. 0.00 perms.
- E. ASTM G-53-77 Moisture/UV Light. UVB-313 Bulb.
Cycle-8 hrs. UV @ 60° C followed by 100 % Humidity @
40° C. 1 year – pass, no crazing, cracking, or loss of
- F. ASTM D-2794 Direct Impact Resistance 140 in./lbs.
II. Testing – Chemical Resistance by Immersion
A. ASTM D-1308 evaluated by ASTM D-714
20% Sulfuric Acid @ 77° F 2 years, no effect
- 25% Sodium Hydroxide @ 140° F 2 years, no effect
- 5% Sodium Chloride Solution @ 77° F 2 years, no effect
- Distilled Water @ 160°F 2 years, no effect
II – Surface Preparation
All pipe and fittings shall be delivered to the application facility without cement
or asphalt lining or any other lining on the interior surface. Because total removal
of old linings is generally not possible nor cost effective, the intent of this
specification is that the entire interior of the DIP and fittings shall be as cast
without any lining material prior to application of the specified lining.
Upon completion of inspection as outlined above, all surface preparation shall be
in strict accordance with NAPF 500-03 revision dated 2/14/2006 as published by:
National Association of Pipe Fabricators, Inc.
1901 N. W. 161st Street
Edmond, OK 73013
A copy of this specification may be obtained at http://www.napf.com/
* Pre-blast Cleaning consult NAPF 500-03-01
** Blast Cleaning specification is per NAPF 500-03-04
III – Application of Lining
Application of the lining material may only be performed by approved firms as
designated by the manufacturer or its authorized representative. No deviations are
allowed from this specification included but not limited to accompanying
procedures that may be provided by the manufacturer for the job inherent to this
- Upon completion of the blast cleaning operation, the lining material
should be applied to the interior of the pipe within 12 hours in order to
avoid any possible post blast surface contamination. Any area found to
have rust bloom prior to application must be reblasted.
- The barrel of the pipe from the inside shoulder of the gasket groove to the
end of the interior spigot shall receive a nominal coating of 40 mils dry
film thickness of the protective lining. If flange fittings or pipe are
included, the lining must not be used on the face of the flange. All fittings
shall be lined with 40 mils nominal of the protective lining.
- Due to the tolerances involved, the gasket groove and spigot end up to 6
inches back from the end of the spigot end must be coated with 6 mils
nominal, 10 mils maximum dry film thickness of un-reduced PermoxCTF
Joint Compound. Application shall be by brush with care taken to
insure the coating is smooth and without excess buildup in the gasket
groove or on the spigot end. No coating application to the gasket groove
and spigot shall take place prior to lining of the pipe barrel.
IV – Inspection
- Each pipe joint and fitting shall be marked in accordance with the
application date of the lining system including its numerical sequence of
application for that date. Applicator may be required to maintain such
records for a reasonable period of time.
- B. Dry film thickness determination for all DIP and Fittings must be checked
and verified using a properly calibrated magnetic film thickness gauge and
testing shall be accomplished using the method outlined in SSPC-PA-2
Film Thickness Rating.
- C. The barrel of all pipe and fittings shall undergo a non-destructive 2,500-
volt pinhole test. Any pinholes detected must be repaired based upon
lining manufacturer’s written recommendations.
V – Certification
The pipe or fitting MANUFACTURER must supply a written certificate attesting
to the fact that the APPLICATOR met the requirements of this specification, that
the material used was as specified, and that the material was applied as required
by the specification.