DRAFT SOW Water Heater.pdf

SCOPE OF WORK (SOW)

Supply and Installation of DHT STV-90030-10D-CU Steam-to-Water Heater with Factory Components ST-90025-3 and ST-90024-78 JD8

1. GENERAL DESCRIPTION

Provide all labor, materials, equipment, and supervision required to install two (2) instantaneous DHT STV-90030-10D-CU vertical steam-to-water heater, including steam, condensate, domestic water, controls, and safety devices. The heater shall operate with the Building Management System (BMS), receiving alarm/status signals and water heater settings adjustment through BMS. Name Brand or Equal MUST BE able to connect/communicate with Metasys Johnson Control and BACNET comparable.

2. EQUIPMENT INCLUDED

2.1 Factory-Supplied Components

• DHT STV-90030-10D-CU

o 10" double-wall copper tube bundle o Vertical ASME shell o Domestic water: 3" inlet / 3" outlet o Relief port: 1"

• ST-90025-3 – 10" Steam Valve Assembly o Modulating steam control valve o Actuator and positioner o Steam inlet connection: 3"

• ST-90024-78 JD8 Condensate Drain Assembly (75JD8) o 2" condensate drain o F&T steam trap o Check valve o Drain valve and strainer

DRAFT

• Temperature controller and sensors

• Control panel (CU package)

2.2 Field-Supplied Components

• 1" T&P Relief Valve – Model M15 2031W o 150 psi / 210°F o 730,000 BTU/hr capacity

• All piping, valves, fittings, supports, insulation

• Electrical wiring and conduit

• BMS alarm wiring

• Local audible alarm buzzer

3. PRE-INSTALLATION TASKS

3.1 Site Verification

• Confirm heater footprint and vertical clearance for tube bundle removal.

• Verify floor structure supports equipment weight.

• Confirm floor drain availability for relief valve and condensate.

• Verify electrical service per DHT submittal.

3.2 Equipment Handling

• Inspect equipment for shipping damage.

• Rig and position heater in mechanical room.

• Anchor unit per manufacturer requirements.

4. MECHANICAL INSTALLATION

4.1 Domestic Water Piping (Potable Side)

Cold Water Inlet – 3"

Install in sequence:

• Full-port isolation valve

• Union

• 3" Y-strainer (40–60 mesh)

• Pressure gauge

• Balancing/flow control valve (if required)

• Check valve (if system is closed)

Hot Water Outlet – 3"

• Isolation valve

• Thermometer

• Pressure gauge

Safety Devices

Install the following:

• 1" T&P Relief Valve – Model M15 2031W o Set pressure: 150 psi o Set temperature: 210°F o Capacity: 730,000 BTU/hr o Install directly on heater relief port o Pipe discharge full-size to floor drain o No valves allowed in discharge line o Terminate with visible air gap o Support piping to avoid stress on valve

4.2 Steam Piping

Steam Inlet – 3"

• Install 3" isolation valve

• Install 3" Y-strainer

• Install 3" drip leg with drain

• Connect to ST-90025-3 steam valve assembly

• Install vacuum breaker on shell

• Pitch steam line toward heater

4.3 Condensate Piping – 2"

Connect to ST-90024-78 JD8 / 75JD8 assembly:

• F&T steam trap (factory)

• 2" check valve

• 2" condensate outlet to return or floor drain

• Maintain continuous fall to trap

• Provide supports and insulation

5. ELECTRICAL & CONTROLS

5.1 Power – VA Electric Shop Responsibility

• Provide dedicated electrical feed to control panel

• Bond panel and actuator to building ground

5.2 Control Wiring (BMS Integration Operation)

Heaters will be integrated and hardwired into the BMS control panel located near the water heater in Mechanical Bay 8.

BMS Dry Contacts

• Low-Temperature Alarm (115°F) o Dry contact (NO) → closes on alarm

• High-Temperature Alarm (145°F) o Dry contact (NC) → opens on alarm o Activates local audible alarm

• Temperature setting adjustments at BMS

• Optional: General fault contact

Optional Analog Outputs

• Hot water temperature (4–20 mA)

• Steam valve position (4–20 mA)

6. STARTUP & COMMISSIONING

6.1 Pre-Startup

• Verify all piping is complete and leak-tested

• Fill and purge water side

• Confirm steam supply valves are closed

• Verify electrical connections and grounding

6.2 Startup

• Energize control panel

• Set outlet temperature to 140°F

• Slowly open steam supply valve

• Verify modulating valve operation

• Confirm condensate trap cycles properly

• Check for leaks, hammer, or abnormal noise

6.3 Alarm Testing

• Simulate low-temperature alarm (115°F)

• Simulate high-temperature alarm (145°F)

• Verify BMS receives both alarms

• Verify audible alarm functions

6.4 Documentation

• Record operating pressures, temperatures, and valve positions

• Provide O&M manuals and as-built drawings

• Train facility staff on operation and alarm response

7. TRAINING (NEW SECTION)

The contractor shall provide comprehensive operator training upon completion of installation and successful startup. Training shall include:

7.1 System Overview

• Review of the DHT STV-90030-10D-CU heater design, components, and operating principles

• Identification of all major assemblies:

o ST-90025-3 Steam Valve Assembly o ST-90024-78 JD8 / 75JD8 Condensate Drain Assembly o Temperature controller and sensors o Relief valve and safety devices

7.2 Normal Operation

• How the heater modulates steam to maintain setpoint

• Understanding autonomous control logic

• Reading temperatures, pressures, and valve positions

• Proper startup and shutdown procedures

7.3 Alarm & Safety Training

• Explanation of low-temperature alarm (115°F)

• Explanation of high-temperature alarm (145°F)

• Audible alarm behavior

• How alarms report to BMS

• What actions operators should take when alarms occur

7.4 Preventive Maintenance

• Cleaning strainers

• Inspecting steam traps

• Verifying vacuum breaker operation

• Checking relief valve discharge

• Recommended maintenance intervals

7.5 Hands-On Demonstration

• Live demonstration of system operation

• Review of control panel functions

• Alarm simulation and response

• Q&A session with facility staff

7.6 Training Deliverables- 10 employees

• Attendance sheet

• Training agenda

• Quick-reference operating guide

• Maintenance checklist

8. INSTALLATION WARRANTY (NEW SECTION)

The contractor shall provide a standard installation warranty covering workmanship, labor, and installation-related defects.

8.1 Warranty Duration

• One (1) year from the date of substantial completion or

• One (1) year from the date of startup (Whichever occurs later, unless otherwise specified by contract.)

8.2 Warranty Coverage

The installation warranty shall cover:

• All labor and workmanship associated with the installation

• Leaks, improper connections, or installation-related failures

• Steam, condensate, and domestic water piping installed under this contract

• Control wiring, alarm wiring, and BMS interface points

• Improper mounting, anchoring, or support of equipment

9. PROJECT MANAGER (PM) – RESPONSIBILITIES & DELIVERABLES

The contractor shall assign a dedicated Project Manager responsible for full oversight of the DHT STV-90030-10D-CU heater replacement project.

9.1 Project Manager Responsibilities

• Serve as the single point of contact for the owner, GC, and facility operations.

• Coordinate all site access, shutdowns, hot-work permits, and safety requirements.

• Manage schedule, manpower, subcontractors, and material procurement.

• Conduct pre-installation walkthrough with facility staff.

• Coordinate equipment delivery, and staging.

• Oversee all mechanical installation, including steam, condensate, domestic water, and relief valve work.

• Coordinate BMS alarm integration and testing with controls contractor.

• Ensure compliance with DHT installation requirements, ASME, and local code.

• Lead startup, commissioning, and operator training.

• Maintain project documentation, including:

o Daily reports o RFI logs o Change orders o As-built drawings o Warranty documents

9.2 PM Deliverables

• Project schedule (Gantt or equivalent)

• Safety plan / JHA

• Submittal package

• Startup checklist

• Training agenda & attendance sheet

• Closeout package with warranty certificate