7473 SOWIFB – 7473 Page 1 of 3
Scope of Work
IFB # 7473-Porcelain Insulators
Technical Specifications
Supply of Electric Substation Porcelain Post Insulators
A. PURPOSE
The City of Denton is providing information that will allow prospective suppliers to prepare
submissions to supply of Electric Substation Porcelain Post Insulators. The products will be
received and distributed through a centralized distribution center located at 901B Texas Street,
Denton, TX 76209. Orders will be placed as needed over the contract term.
B. SUBMISSIONS
Submissions shall be provided using the Exhibit 1, with supporting documentation as required.
Additional information clarifying the supplier’s product may be attached to their submission.
Pricing shall include all costs to deliver goods as specified in this specification. Any special fees
or commissions, and all freight for delivery to the City of Denton Warehouse and unloading costs
must be included in the quoted price. Item pricing shall be mutually exclusive; thus, the City of
Denton reserves the right to choose the best valued item from different vendors.
C. QUALITY CONTROL
The manufacturer shall be responsible for the quality control of the manufacturing processes to
assure that all requirements of these specifications are met. However, the City reserves the right
to observe, to inspect and to require additional quality control investigations, either by its personnel
or an independently employed quality control investigator, at any or all stages of fabrication at the
manufacturer’s facilities. Failure to adequately maintain fabrication and quality of fabrication until
completion shall be grounds for cancellation of the order or any part thereof.
Field failure or field repairs required due to quality control failures or manufacturing procedures
shall be the responsibility of the manufacturer.
D. WRITTEN WARRANTY and GUARANTEES
Written guarantees shall include any limitations as to the nature of failure or time limitations. The
guarantee shall begin upon receipt of the accepted units, not on the date of manufacture.
Guarantees shall indicate whether or not it is made on a full replacement basis or a prorated basis
and if prorated then what are the terms. Manufacturer/supplier guarantees that the goods furnished
under this specification are of high quality and agrees to replace any goods found to be defective
during inspection, installation, or service for a minimum period of 12 months after unit is delivered
to Denton. All replacements by the manufacturer/supplier shall be free of charge F.O.B. at the
same delivery point called for in the original order. Replacements must be handled in a
professional and timely manner and in no case shall a replacement unit take longer than 60 days
to arrive in Denton after first being submitted for replacement.
IFB – 7473 Page 2 of 3
Respondent guarantees that all products quoted and furnished under this agreement will be
accepted at any normally used United States approved repair and warranty shop should one be
available for the manufacturer’s product quoted. The City of Denton will not accept a
manufacturer’s product that was rejected or substandard and then sold to a broker for either resale
or scrap that would not be fully warranted by the original manufacturer.
The respondent must be an approved distributor by the manufacturer of these products and is
authorized to sell the products to the City of Denton. The respondent also guarantees that the City
will be represented by the Manufacturer, should an issue arise, and that all manufacturer’s
warranties will be in effect for the life of the contract.
E. SPECIAL DELIVERY REQUIREMENTS
Deliveries shall be made between 8:00 AM -3:00 PM Monday through Friday, excluding holidays
to City of Denton Distribution Center, 901B Texas Street, Denton, TX 76209. This location does
have a forklift and dock available for offloading.
F. TECHNICAL RESPONSIBILITIES AND REQUIREMENTS
Mechanical Requirements
Type TR227 TR278 TR289 TR222
Color
ANSI 70
Grey
ANSI 70
Grey
ANSI 70
Grey
ANSI 70
Grey
ANSI 70
Grey
Height (in.) 15 30 54 54 10
Minimum creep (in.) 24 72 116 116 10.5
Bolt circle (in.) 5 5 5 7 5
Cantilever strength (lb.) 4,000 3,000 2,200 4,100 4,000
Tension strength (lb.) 20,000 25,000 25,000 40,000 15,000
Torsion strength (lb.) 16,000 40,000 90,000 120,000 12,000
Compression strength (lb.) 20,000 60,000 75,000 120,000 20,000
Electrical Requirements
Critical impulse flashover (pos., kV) 170 390 710 710 105
Low frequency wet withstands (kV) 60 145 275 275 30
Minimum BIL (kV) 150 350 650 650 95
Radio Influence Requirements
RIV test voltage (kV RMS L-G) 60 44 88 88 5
RIV maximum (µV at 1000 Hz) 100 200 200 200 50
Equivalent Lapp catalog number
SDJ-
315227-70
SDJ-
315278-70
SDJ-
315289-70
SDJ-
314857-70
SDJ-
315222-70
Equivalent NGK Locke catalog number PH01510 PH03510 PH06510 PE06510 PH00910
Equivalent Victor catalog number 1768 1765 17PA26 16PA38 1766
Equivalent Ohio Brass catalog number 2326863001 2323363001 2323383001
Equivalent GAMMA catalog number 227HU0150 278HU0350 289HU0650 289EU0650 222HU0095
IFB – 7473 Page 3 of 3
G. ACCEPTABLE MANUFACTURERS
DME will only accept submissions from specific manufacturers listed in the approved
manufacturers list below.
1. Lapp
2. NGK Locke
3. Victor
4. Ohio Brass
5. GAMMA
The City has implemented a pre-approval process for substitution commodities and services. The
commodity approval form can be obtained via email (dustin.rolfe@cityofdenton.com). Supporting
documentation or samples must be submitted for review by Purchasing, Engineering, field crews,
QAG (Quality Assurance Group), and the manager of DME. Testing may be required and may
take substantial time to review. Vendors are encouraged to submit forms and samples for
consideration on the next solicitation for similar items.