2020_June_Heat-Exch_DueDiligenceNOI.docx

Due Diligence Posting of Notice of Intent Massachusetts Department of Transportation 24 June 2020

The Massachusetts Department of Transportation (“Department”) of the Commonwealth of Massachusetts announces its intent to award a contract to Little Engineering Sales & Service of Canton (“Offeror”), pending the results of this Notice of Intent (“Notice”) pursuant to the Commonwealth’s Due Diligence Posting policy.

Project Description: MassDOT is the owner of the Transportation Building at 10 Park Plaza in Boston Massachusetts. The building is heated by the use of steam into a heat exchange system. The building, originally built in 1996, undergoes necessary maintenance and on occasion upgrades in its facilities and systems.

MassDOT receives its steam from Vicinity Energy by agreement. In the interests of improving efficiency in the heating system at the Park Plaza building, Vicinity Energy has offered MassDOT a substantial financial rebate in return for the installation of a Maxi-Therm, Mod# MCU-1240G-30F-125P.

Minimum product specifications are provided in Attachment A.

The manufacturer assures delivery of the unit within 14 weeks of placing the order.

Heat exchanger is to be built to the TEMA standards in addition to ASME Code. The exchanger is to have a 5-year limited warranty. Full specifications are attached but include vertical heat exchangers, with carbon steel shell construction, 90/10 CuNi tubes of 3/4” OD x 0.049’’ wall and SS304L tube sheet(s). Steam side to be ASME stamped for 300 psig @375oF, liquid side to be ASME stamped for 300 psig @375oF. Any recommendation of a competitive product must have ANSI 300# flanged connection on steam inlet, condensate outlet and liquid inlet and outlet.

Determination of Other Interested Vendors: The intent of this posting is to determine if there are any other interested and qualified entities capable of completing the anticipated work. Any such entity must submit documentation that they can also provide the same service to the Department at more competitive cost or better value and in a timely fashion.

Response Requirement and Deadline: All Interested Vendors and Offerors interested in responding to this Notice, regardless of prior communications with the Department, must submit a Response to this posting via COMMBUYS (see below) containing evidence of their qualifications, capability, and interest.

All required information must be received by 3:00 PM on 10 July 2020. If interest is generated by this Notice the Department will review any and all Responses and will determine whether they will: (i) withdraw the notice and not accept the Offeror’s offer (and cancel the Notice of Intent) or (ii) accept the offer from the Offeror or (iii) accept an offer from another vendor offering a more competitive cost or better value than the Offeror in their Response.

Additional Terms/Forms Required for Doing Business with the Commonwealth

Response (Quote) Submission Method: Online Quote Submission via COMMBUYS is required. All Interested Vendors and Offerors must submit Quotes online using tools available only to Sellers registered in COMMBUYS. COMMBUYS provides Seller registration functionality at no charge. To register, go to www.COMMBUYS.com and click on the “Register” link on the front page. All Interested Vendors and Offerors who are awarded a contract resulting from this Notice, if any, will be required to maintain an active account during the duration of the Contract, by reviewing their registration information regularly and maintaining its accuracy.

COMMBUYS Quote Submission Training and Instructions: The following resources are provided to assist Interested Vendors and Offerors in submitting Quotes:

· An online job aid on How to Create a Quote;

· Webcast video on How to Find Bids (Solicitations) and Submit Quotes (Responses) through COMMBUYS;

· Instructor-led trainings (ILT) and live webinar sessions on “How to Locate and Respond to Bids” may also be available. Check the OSD Training Courses schedule for Sellers/Business Entities for available locations, dates and times. Note that space is limited and pre-registration for trainings is required to attend. Follow instructions on the course schedule to register.

Any questions or concerns regarding COMMBUYS may be directed to the Help Desk at COMMBUYS@mass.gov or during normal business hours (8am - 5pm ET Monday - Friday) at 1-888-627-8283 or 617-720-3197.

ATTACHMENT A: MINIMUM SPECIFICATIONS – HEAT EXCHANGER

I. STEAM TO LIQUID VERTICAL FLOODED HEAT EXCHANGERS

A. The heat exchanger skid shall be supplied with Simplex heat exchanger mounted on a single skid. Sizing as shown on schedules. Skid shall be provided with single entry points for liquid inlet, liquid outlet, steam inlet and condensate outlet. The skid shall be hydrostatically tested prior to shipping.

B. The basis of operation shall be as follows. The hydronic water is heated in the u-tubes of a vertical heat exchanger designed to be flooded at approximately 15% at full load in order to have a condensate outlet temperature of 200oF or lower, eliminating energy losses due to flash steam.

C. The steam will be supplied directly to the skid; no pressure reducing station or control valves are required. Condensate can be lifted at the outlet of the skid; no condensate pump required.

D. The process is modulated using an electric fail-safe control valve installed on the condensate outlet that exposes the necessary heating surface by flooding the shell of the heat exchanger proportionally to the instantaneous required load. An outlet temperature setpoint stability of +/- 2oF will be achieved at all flow conditions.

E. The Heat Exchanger shall be capable of control with a minimum water side circulation of 15% of design flow at all times during operation. Circulating pumps supplied by others, are to push the liquid to be heated through the heat exchanger.

I. Items delivered separately to be installed on jobsite by contractor:

Vertical heat exchangers, with carbon steel shell construction, 90/10 CuNi tubes of 3/4” OD x 0.049’’ wall and SS304L tube sheet(s). Steam side to be ASME stamped for 300 psig @375oF, liquid side to be ASME stamped for 300 psig @375oF. Heat exchanger shall have ANSI 300# flanged connection on steam inlet, condensate outlet and liquid inlet and outlet. Heat exchanger to be built to the TEMA standards in addition to ASME Code (see comparison on last page) and have a 5-year limited warranty.

ASME Code Only vs TEMA – A Brief Comparison Background ASME Section VIII, Division I is a safety Code that was originally developed in the 1930’s and covers all types of pressure vessels, including tanks, columns, towers, reactors, and Shell & Tube Heat Exchangers (HX). It sets minimum requirements with respect to thickness of components and methods of fabrication and testing for the safe operation of a particular piece of relevant equipment.

The TEMA Standard – which stands for the Tubular Exchangers Manufacturers Association – is a specific set of both safe design standards, as well as supplemental requirements and best practices aimed at not only ensuring the safe operation of a Shell & Tube Heat Exchanger at given conditions, but also that the HX will have a longer life-span than if it were fabricated as “Code Only”. In short, when a HX is fabricated in accordance with the TEMA standards, it is a heavier duty product than Code Only.

Examples Given: A 12” Nominal Shell & U-tube Heat Exchanger, designed for 150 PSIG working pressure, to be used in a typical HVAC Steam to Water application.

· Shell Thickness- Code Only: 0.190”, TEMA Min: 0.375” TEMA is 50% heavier duty

· Tube Thickness- Code Only: 0.035”, TEMA Min: 0.049” TEMA is 30% heavier duty

· Gasket Width – Code Only: Not Addressed, TEMA Min: 0.625” to ensure effective seal

· # Tie-Rods in Tube Bundle to ensure adequate stiffness – Code Only: Not Addressed, TEMA Min: (4) Tie-Rods Summary Obviously, it is not possible to cover all aspects of the differences between a Code Only heat exchanger, and one designed and fabricated to the TEMA standards in just a few short lines. But when specifying a shell & tube heat exchanger, requiring that it be built to the TEMA standards in addition to ASME Code, will ensure that the equipment will be fabricated in accordance with the standard that has achieved worldwide acceptance as the authority on the thermal and mechanical design and fabrication of Shell & Tube Heat Exchangers.

Revised: June 30, 2016