diff --git a/hopp/eco/hydrogen_mgmt.py b/hopp/eco/hydrogen_mgmt.py
index d104063b8..dce34fc21 100644
--- a/hopp/eco/hydrogen_mgmt.py
+++ b/hopp/eco/hydrogen_mgmt.py
@@ -1,6 +1,12 @@
 import numpy as np
 import pandas as pd
 
+from ORBIT import ProjectManager, load_config
+from ORBIT.core import Vessel
+from ORBIT.core.library import initialize_library
+from ORBIT.phases.design import DesignPhase
+from ORBIT.phases.install import InstallPhase
+
 from hopp.hydrogen.h2_transport.h2_compression import Compressor
 from hopp.hydrogen.h2_storage.pressure_vessel import PressureVessel
 from hopp.hydrogen.h2_storage.pipe_storage.underground_pipe_storage import (
@@ -11,13 +17,13 @@
 )
 from hopp.hydrogen.h2_transport.h2_export_pipe import run_pipe_analysis
 from hopp.hydrogen.h2_transport.h2_pipe_array import run_pipe_array_const_diam
+
 from hopp.offshore.fixed_platform import (
-    install_platform,
-    calc_platform_opex,
-    calc_substructure_mass_and_cost,
+    FixedPlatformDesign,
+    FixedPlatformInstallation,
+    calc_platform_opex
 )
 
-
 def run_h2_pipe_array(
     plant_config, orbit_project, electrolyzer_physics_results, design_scenario, verbose
 ):
@@ -435,32 +441,43 @@ def run_equipment_platform(
             )  # from kg to tonnes
             toparea += h2_storage_results["tank_footprint_m2"]
 
-        distance = plant_config["site"]["distance_to_landfall"]
+        #### initialize
+        ProjectManager.register_design_phase(FixedPlatformDesign)
+        ProjectManager.register_install_phase(FixedPlatformInstallation)
+        platform_config = plant_config["platform"]
 
-        installation_cost = install_platform(
-            topmass,
-            toparea,
-            distance,
-            install_duration=plant_config["platform"]["installation_days"],
-        )
+        # assign site parameters
+        if platform_config["site"]["depth"] == -1:
+            platform_config["site"]["depth"] = plant_config["site"]["depth"]
+        if platform_config["site"]["distance"] == -1:
+            platform_config["site"]["distance"] = plant_config["site"]["distance"]
+        # assign equipment values
+        if platform_config["equipment"]["tech_required_area"] == -1:
+            platform_config["equipment"]["tech_required_area"] = topmass
+        if platform_config["equipment"]["tech_required_area"] == -1:
+            platform_config["equipment"]["tech_required_area"] == toparea
 
-        depth = plant_config["site"]["depth"]  # depth of pipe [m]
+        platform = ProjectManager(platform_config)
+        platform.run()
 
-        capex, platform_mass = calc_substructure_mass_and_cost(topmass, toparea, depth)
+        design_capex = platform.design_results['platform_design']['total_cost']
+        install_capex = platform.installation_capex
+        total_capex = design_capex + install_capex
 
-        opex_rate = plant_config["platform"]["opex_rate"]
-        total_opex = calc_platform_opex(capex, opex_rate)
+        total_opex = calc_platform_opex(total_capex, platform_config["opex_rate"])
 
-        total_capex = capex + installation_cost
+        platform_mass = platform.design_results['platform_design']['mass']
+        platform_area = platform.design_results['platform_design']['area']
 
     else:
         platform_mass = 0.0
+        platform_area  = 0.0
         total_capex = 0.0
         total_opex = 0.0
 
     platform_results = {
         "topmass_kg": topmass,
-        "toparea_m2": toparea,
+        "toparea_m2": platform_area,
         "platform_mass_tonnes": platform_mass,
         "capex": total_capex,
         "opex": total_opex,
diff --git a/hopp/offshore/fixed_platform.py b/hopp/offshore/fixed_platform.py
index 87268d753..245770102 100644
--- a/hopp/offshore/fixed_platform.py
+++ b/hopp/offshore/fixed_platform.py
@@ -96,7 +96,7 @@ def run(self):
 
         _platform = self.config.get('equipment',{})
 
-        self.mass = _platform.get('tech_comnined_mass',999)     # t
+        self.mass = _platform.get('tech_combined_mass',999)     # t
         self.area = _platform.get('tech_required_area', 1000)   # m**2
 
         design_cost = _platform.get('topside_design_cost', 4.5e6)   # USD
@@ -200,9 +200,9 @@ def setup_simulation(self, **kwargs):
                         self.depth, fab_cost, design_cost, steel_cost
                         )
 
-        total_mass = substructure_mass  # t
+        self.total_mass = substructure_mass  # t
          # Call the install_platform function
-        self.install_capex = install_platform(total_mass, self.area, self.distance, \
+        self.install_capex = install_platform(self.total_mass, self.area, self.distance, \
                                                    install_duration, self.install_vessel)
 
     # An install object needs to have attribute system_capex, installation_capex, and detailed output
@@ -331,7 +331,6 @@ def calc_platform_opex(capex, opex_rate=0.011):
     config_path = os.path.abspath(__file__)
     config_fname = load_config(os.path.join(config_path, os.pardir, "example_fixed_project.yaml"))
 
-    
     ProjectManager.register_design_phase(FixedPlatformDesign)
 
     ProjectManager.register_install_phase(FixedPlatformInstallation)