S02 Attachment 12_0124003 Medical Gas Pressure Drop Calcs_6 Pages.pdf

PDF 79 KB Posted Apr 7, 2026

Attached to: Z2DA--FY26: NRM (PROJ: 548-CSI-139) BB Construction Renovate IR Cath Lab
Solicitation number: 36C24826Q0453
Issued by: Department of Veterans Affairs Veterans Health Administration Veterans Integrated Service Network 8

About this file

Written by GovTribe AI · Apr 7, 2026

This document is a Design Brief containing pressure drop calculations for medical gas systems at WPB IR Cath Lab, Project No. 548-CSI-139, dated 5/9/2025 and prepared by AJZ.

The brief includes six separate pressure drop calculator sheets for different medical gases used in an interventional radiology catheterization lab facility. For Oxygen (55 PSIG system, 51 PSI operating), the calculated pressure drop is 0.434 PSI across three main pipe sections (O1 to ZVB, ZVB, and ZVB to Main) with 1/2-inch piping and 100% diversity factor. Vacuum (19 inhg system, 16 inhg operating) shows a calculated total pressure drop of 0.338 inhg with similar piping sections and 1.0-inch piping. Medical Air (55 PSI system, 51 PSI operating) has a calculated pressure drop of 0.386 PSI using 1/2-inch piping. WAGD (12 inhg system, 7 inhg operating) shows 0.118 inhg pressure drop with 0.75-inch piping. Nitrous Oxide (55 PSI system, 51 PSI operating) indicates 0.227 PSI calculated pressure drop with 1/2-inch piping. Nitrogen (185 PSI system, 201 PSI operating) displays 0.665 PSI calculated pressure drop across four pipe sections with mixed 1/2-inch and 3/4-inch piping, and flows of 10.60 CFM per outlet.

All calculations apply a 1.50 fitting factor, maintain 100% diversity factor across active sections, and stay within allowable pressure drop limits specified for each gas type. The design establishes residual pressure requirements at system endpoints and defines outlet configurations for cardiac catheterization room applications.

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DESIGN BRIEF

PROJECT:

PROJECT No: 548-CSI-139

DATE: 5/9/2025

PREPARED BY: AJZ

CHECKED BY:

SUBJECT: Oxygen Pressure Drop Calculator

Type of Gas O2 (55 PSIG)

System Pressure 51 PSI

Allowable PD 1 PSI Calculated PD 0.434 PSI

Max. Desired PD/100 Ft 0.71 PSI

Fitting Factor 1.50

O1 TO ZVB 57.5 86.3 51.00 1.00 2.00 2.00 2.56 100% 5.12 5.12 1/2 0.306 0.264 50.736

ZVB 13 19.5 50.74 0.74 - 2.00 - 100% 0.00 5.12 1/2 0.306 0.060 50.676

ZVB TO MAIN 24 36.0 50.68 0.68 - 2.00 - 100% 0.00 5.12 1/2 0.306 0.110 50.566

- 50.57 0.57 2.00 100% 0.00 5.12 - - 50.566

- - - 2.00 100% 0.00 5.12 - - 50.566

Pipe Section Length

(Ft)

Effective

Length

Initial

Presssure

(PSI)

Allowable

Pressure

Drop

Section

PSI H

P D

A la rm Pressure Drop

WPB IR CATH LAB

Outlets

Added

This Leg

Cumulative

Number

Outlets

Design

Flow

(CFM)

Diversity

Factor

Adjusted

Flow

(CFM)

Total

Adjusted

Flow

Pipe

Size

(in)

Residual

Pressure

PSI per

100 Ft

PROJECT No: 548-CSI-139

DATE: 5/9/2025

PREPARED BY: AJZ

SUBJECT: Vacuum Pressure Drop Calculator

Type of Gas Vacuum (19 inhg)

System Pressure 16 inhg Calculated Total PD 0.338 inhg

Allowable PD 1 inhg

Max. Desired PD/100 Ft 0.75

Fitting Factor 1.50

O1 TO O2 17.75 26.6 16.00 1.00 3.00 Cardiac Catherization Room 0.10 0.30 100% 4.00 4.00 1.00 0.251 0.067 0.933

O2 TO ZVB 38 57.0 15.93 0.93 3.00 Cardiac Catherization Room 0.10 0.30 100% 0.30 4.30 1.00 0.251 0.143 0.790

ZVB 13 19.5 15.79 0.79 - - - - 100% - 4.30 1.00 0.251 0.049 0.741

ZVB TO MAIN 21 31.5 15.74 0.74 - - - - 100% - 4.30 1.00 0.251 0.079 0.662

- 15.66 0.66 - - - 100% - 4.30 - - 0.662

- - - - - - 100% - 4.30 - - 0.662

Residual

Pressure

Adjusted

Flow

(CFM)

Total

Adjusted

Flow H i rm Pressure Drop

WPB IR CATH LAB

Pipe Section Length

(Ft)

Effective

Length

Initial

Presssure

(inhg)

Service Count Cumulative

CFM

Diversity

Factor

CFM

per

Outlet

Pipe

Size

(in)

Section inhg inhg

/100 Ft

Outlets

Added

This Leg

Allowable

Pressure

Drop

PROJECT No: 548-CSI-139

DATE: 5/9/2025

PREPARED BY: AJZ

SUBJECT: Medical Air Pressure Drop Calculator

Type of Gas MED AIR (55 PSI)

System Pressure 51 PSI

Allowable PD 1 PSI Calculated PD 0.386 PSI

Max. Desired PD/100 Ft 0.71 PSI

Fitting Factor 1.50

O1 TO ZVB 57.5 86.3 51.00 1.00 2.00 2.00 2.56 100% 5.12 5.12 1/2 0.272 0.235 50.765

ZVB 13 19.5 50.77 0.77 - 2.00 100% 0.00 5.12 1/2 0.272 0.053 50.712

ZVB TO MAIN 24 36.0 50.71 0.71 - 2.00 100% 0.00 5.12 1/2 0.272 0.098 50.614

- 50.61 0.61 2.00 100% 0.00 5.12 - - 50.614

- - - 2.00 100% 0.00 5.12 - - 50.614

Pipe Section Length

(Ft)

Effective

Length

Initial

Presssure

(PSI)

Allowable

Pressure

Drop

Section

PSI H

i rm Pressure Drop

WPB IR CATH LAB

Outlets

Added

This Leg

Cumulative

Number

Outlets

Design

Flow

(CFM)

Diversity

Factor

Adjusted

Flow

(CFM)

Total

Adjusted

Flow

Pipe

Size

(in)

Residual

Pressure

PROJECT No: 548-CSI-139

DATE: 5/9/2025

PREPARED BY: AJZ

SUBJECT: WAGD Pressure Drop Calculator

Type of Gas WAGD (12 inhg)

System Pressure 7 inhg

Allowable PD 1 inhg Calculated PD 0.118 inhg

Max. Desired PD/100 Ft 0.71 ingh

CFM flow per outlet 1.80 CFM

Fitting Factor 1.50

O1 TO ZVB 57.5 86.3 7.00 1.00 1.00 1.00 1.80 100% 1.80 1.80 0.75 0.083 0.072 6.928

ZVB 13 19.5 6.93 0.93 - 1.00 1.80 100% 0.00 1.80 0.75 0.083 0.016 6.912

ZVB TO MAIN 24 36.0 6.91 0.91 - 1.00 1.80 100% 0.00 1.80 0.75 0.083 0.030 6.882

- 6.88 0.88 1.00 1.80 100% 0.00 1.80 - - 6.882

- - - 1.00 1.80 100% 0.00 1.80 - - 6.882

Cumulative

Number

Outlets

Design

Flow

(CFM)

Diversity

Factor

Adjusted

Flow

(CFM)

Total

Adjusted

Flow

Pipe

Size

(in) H i rm Pressure Drop Residual

Pressure

inhg

/100 Ft

Section inhg

WPB IR CATH LAB

Pipe Section Length

(Ft)

Effective

Length

Initial

Presssure

(inhg)

Allowable

Pressure

Drop

Outlets

Added

This Leg

PROJECT No: 548-CSI-139

DATE: 5/9/2025

PREPARED BY: AJZ

SUBJECT: Nitrous Oxide Pressure Drop Calculator

Type of Gas NO (55 PSI)

System Pressure 51 PSI

Allowable PD 1 PSI Calculated PD 0.227 PSI

Max. Desired PD/100 Ft 0.71 PSI

Fitting Factor 1.50

O1 TO ZVB 57.5 86.3 51.00 1.00 1.00 1.00 1.06 100% 1.06 1.06 1/2 0.160 0.138 50.862

ZVB 13 19.5 50.86 0.86 - 1.00 - 100% 0.00 1.06 1/2 0.160 0.031 50.831

ZVB TO MAIN 24 36.0 50.83 0.83 - 1.00 - 100% 0.00 1.06 1/2 0.160 0.058 50.773

- 50.77 0.77 1.00 100% 0.00 1.06 - - 50.773

- - - 1.00 100% 0.00 1.06 - - 50.773

Pipe Section Length

(Ft)

Effective

Length

Initial

Presssure

(PSI)

Allowable

Pressure

Drop

Section

PSI H

i rm Pressure Drop

WPB IR CATH LAB

Outlets

Added

This Leg

Cumulative

Number

Outlets

Design

Flow

(CFM)

Diversity

Factor

Adjusted

Flow

(CFM)

Total

Adjusted

Flow

Pipe

Size

(in)

Residual

Pressure

PROJECT No: 548-CSI-139

DATE: 5/9/2025

PREPARED BY: AJZ

SUBJECT: Nitrogen Pressure Drop Calculator

Type of Gas N2 (185 PSI)

System Pressure 201 PSI

Allowable PD 1 PSI Calculated PD 0.665 PSI

Max. Desired PD/100 Ft 0.53 PSI

CFM flow per outlet 10.60

Fitting Factor 1.50

O1 TO ZVB 51 76.5 201.00 1.00 1.00 1.00 10.60 100% 10.60 10.60 1/2 0.419 0.321 200.679

ZVB 13 19.5 200.68 0.68 - 1.00 10.60 100% 0.00 10.60 1/2 0.419 0.082 200.598

ZVB TO MAIN 22 33.0 200.60 0.60 - 1.00 10.60 100% 0.00 10.60 1/2 0.419 0.138 200.459

MAIN TO SOURCE 103.75 155.6 200.46 0.46 - 1.00 10.60 100% 0.00 10.60 3/4 0.080 0.125 200.335

- 200.33 0.33 1.00 10.60 100% 0.00 10.60 - - 200.335

- - - 1.00 10.60 100% 0.00 10.60 - - 200.335

Section

PSI H

i rm Pressure Drop

WPB IR CATH LAB

Outlets

Added

This Leg

Cumulative

Number

Outlets

Design

Flow

(CFM)

Diversity

Factor

Adjusted

Flow

(CFM)

Total

Adjusted

Flow

Pipe

Size

(in)

Residual

Pressure

PSI per

100 Ft

Pipe Section Length

(Ft)

Effective

Length

Initial

Presssure

(PSI)

Allowable

Pressure

Drop

File details come from the government source that posted it. Updated Apr 7, 2026.