HomeMy WebLinkAboutB15-0207_Engineering letter_1434564360.pdf aec
Architectural Engineering Consultants, Inc.
Mechanical, Electrical, & Lighting Design Services
An Office with LEEDTTMM Accredited Professionals
40801 US Hwy 6 & 24, Suite 214, Eagle-Vail, CO 81620 Post Office Box 8489, Avon, CO 81620
phone: 970-748-8520 fax: 970-748-8521 email: stan@aec-vail.com web: www.aec-vail.com
Keith Forney
Storm King Mechanical
skmkeith@aol.com
Reference: Northwoods Unit 311 Plumbing Riser Review
Hi Keith,
This letter is intended to demonstrate how the addition of plumbing fixtures to the remodel at
Northwoods Unit 311 can comply with the capacity limitations set by the 2015 International
Plumbing Code (IPC). This remodel will add a shower to the third level, and a bathroom group
(lavatory, water closet, shower) to the fourth level. Additionally, the clothes washer located on
the third level will be relocated to the fourth level.
This riser analysis has been completed off of original construction drawings dated 12/24/76.
The contractor shall provide a comprehensive site review prior to installation to confirm that
existing risers and fixture layouts match these existing plans. The contractor shall also confirm
that all waste piping slopes at ¼”/foot, and shall confirm existing supply water pressures are
suitable to handle the additional water load. If any of these conditions differ, please contact
engineer for further review. See attached markups on the existing riser diagram for additional
information. This information should be treated as a general guideline only; it is the
contractor’s responsibility to ensure that all work adhere to the standards of the 2015 IPC.
New 4th Level Bathroom Group and New 3rd Level Shower to Riser P-4
Connect the new water lines for the 4th level bathroom group and the 3rd level shower to
existing riser P-4. Per the analysis below (per Appendix E of the 2015 IPC), this will maintain
flows very close to or below 5 fps.
Riser
Location
Riser Size
Cold
Riser Size
Hot
Existing Proposed
WSFU GPM FPS WSFU GPM FPS
4th Floor 1” 5.7 10 3.7 8.4 13 5
3rd Floor 1 ¼” 11.1 15.5 4 14.8 17.5 4.5
2nd Floor 1 ½” 16.8 18.3 3 20.5 20 3.5
1st Floor 1 ½” 19.5 19.4 3.5 23.2 23 4
4th Floor 1” 4.5 8.7 3.3 6 10.7 4
3rd Floor 1” 7.5 12.3 4.5 10 14.6 5.2
2nd Floor 1 ¼” 10.5 15 3.7 13 16.5 4.1
1st Floor 1 ¼” 12 16 4 14.5 17.5 4.5
Northwoords Unit 311 Riser Analysis Page 2 of 2
June 10, 2015
Connect the new waste lines for the 4th level bathroom group and the 3rd level shower to
existing riser P-4. Prior to connection, the existing waste lines shall be reworked as follows.
The waste stack which jogs in the 2nd level ceiling shall be continued vertically (i.e. no
horizontal offset) to the 3rd level ceiling, and the stack vent shall takeoff from this location. All
existing horizontal drainage from the 4th floor fixtures, including the new bathroom group, shall
be routed to this new stack extension. Per the analysis below (per Chapter 7 of the 2015 IPC),
the added loads are below the accepted maximums for the pipes they serve.
Line Location Line Size Existing DFU Proposed DFU Maximum Allowable DFU
4th Floor - Horizontal 3” 12 18 20
3rd Floor – Vertical 3” 12 18 20
3rd Floor – Horizontal 3” 12 14 20
2nd Floor – Vertical 3” 24 34 48
1st Floor - Vertical 3” 36 46 48
Relocated 4th Level Clothes Washer to Riser P-5
Connect new water lines from the relocated clothes washer to existing riser P-4. Per the
analysis below (per Appendix E of the 2015 IPC), this will maintain flows near to or below 5 fps.
Riser
Location
Riser Size
Cold
Riser Size
Hot
Existing Proposed
WSFU GPM FPS WSFU GPM FPS
4th Floor ¾” 2.7 6 4 3.7 7.5 5
3rd Floor 1” 5.4 10 3.8 6.4 11 4.2
2nd Floor 1 ¼” 8.1 12.8 3 9.1 13.7 3.2
1st Floor 1 ¼” 10.8 15.4 3.9 11.8 15.8 4
4th Floor ¾” 1.5 4 2.5 2.5 5.7 3.8
3rd Floor ¾” 3 6.5 4.4 4 8 5.2
2nd Floor 1” 4.5 8.7 3.2 5.5 10 3.8
1st Floor 1” 6 10.7 4 7 11.8 4.4
Connect the new waste lines for the relocated clothes washer to existing riser P-5. Connect at
the 3” main in the horizontal. Tie the vent line to the existing 3” vent. Per the analysis below
(per Chapter 7 of the 2015 IPC), the added loads are below the accepted maximums for the
pipes they serve.
Line Location Line Size Existing DFU Proposed DFU Maximum Allowable DFU
4th Floor - Horizontal 3” 6 8 20
3rd Floor – Vertical 3” 12 14 20
2nd Floor – Vertical 3” 18 20 48
1st Floor - Vertical 4” 24 26 48
Sincerely,
Taylor Critchlow, PE