diff --git a/src/app/service-graph/services/d3-helpers/graph-elements.helpers.ts b/src/app/service-graph/services/d3-helpers/graph-elements.helpers.ts
new file mode 100644
index 0000000..bbacbdc
--- /dev/null
+++ b/src/app/service-graph/services/d3-helpers/graph-elements.helpers.ts
@@ -0,0 +1,67 @@
+
+/*
+ * Copyright 2017-present Open Networking Foundation
+
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+
+ * http://www.apache.org/licenses/LICENSE-2.0
+
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+import * as d3 from 'd3';
+import {XosServiceGraphConfig as config} from '../../graph.config';
+
+export interface Id3BBox {
+  x?: number;
+  y?: number;
+  width: number;
+  height: number;
+}
+
+export interface IXosGraphHelpers {
+  parseElemClasses (classes: string): string;
+  getBBox(context: any): Id3BBox;
+  getSiblingTextBBox(contex: any /* D3 this */): Id3BBox;
+  getSiblingIconBBox(contex: any /* D3 this */): Id3BBox;
+  getSiblingBBox(contex: any): Id3BBox;
+}
+
+export class XosGraphHelpers implements IXosGraphHelpers {
+  public parseElemClasses (classes: string): string {
+    return angular.isDefined(classes) ? classes.split(' ')
+      .map(c => `ext-${c}`)
+      .join(' ') : '';
+  }
+
+  public getBBox(context: any): Id3BBox {
+    return d3.select(context).node().getBBox();
+  }
+
+  public getSiblingTextBBox(contex: any): Id3BBox {
+    const text: d3.Selection<any> = d3.select(contex.parentNode).select('text');
+    return text.empty() ? {width: 0, height: 0} : text.node().getBBox();
+  }
+
+  public getSiblingIconBBox(contex: any): Id3BBox {
+    return d3.select(contex.parentNode).select('path').node().getBBox();
+  }
+
+  public getSiblingBBox(contex: any): Id3BBox {
+    // NOTE consider that inside a node we can have 1 text and 1 icon
+    const textBBox: Id3BBox = this.getSiblingTextBBox(contex);
+    const iconBBox: Id3BBox = this.getSiblingIconBBox(contex);
+
+    return {
+      width: iconBBox.width + (textBBox.width ? config.node.padding + textBBox.width : 0),
+      height: iconBBox.height
+    };
+  }
+}
diff --git a/src/app/service-graph/services/d3-helpers/graph-icons.service.ts b/src/app/service-graph/services/d3-helpers/graph-icons.service.ts
new file mode 100644
index 0000000..9baeb57
--- /dev/null
+++ b/src/app/service-graph/services/d3-helpers/graph-icons.service.ts
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+
+ * http://www.apache.org/licenses/LICENSE-2.0
+
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import * as _ from 'lodash';
+
+export interface IXosServiceGraphIcon {
+  name: string;
+  path: string;
+  transform: string; // do we need it??
+}
+
+const icons: IXosServiceGraphIcon[] = [
+  {
+    name: 'service',
+    path: 'M.08,15.51V10.7h0L1.5,10.5,3,10.29s0,0,.06,0A10.13,10.13,0,0,1,3.9,8.05a.11.11,0,0,0,0-.12L2.24,5.66s0-.08,0-.12Q3.91,3.91,5.56,2.26a.08.08,0,0,1,.1,0L7.87,3.83a.21.21,0,0,0,.25,0A10,10,0,0,1,10.17,3s0,0,.05-.05l.09-.56c.11-.65.22-1.29.32-1.94a2.57,2.57,0,0,0,.06-.4h4.78a.11.11,0,0,0,0,.08c.15.92.31,1.84.46,2.76a.07.07,0,0,0,.06.06,11.76,11.76,0,0,1,2.11.88.09.09,0,0,0,.12,0l2.34-1.62a.05.05,0,0,1,.08,0l3.28,3.36a.05.05,0,0,1,0,.08L23.66,6c-.47.63-.93,1.27-1.39,1.91,0,0,0,.06,0,.1l.14.25a9.19,9.19,0,0,1,.74,1.88s0,.06.06.06l.8.13,1.76.3a1.17,1.17,0,0,0,.32,0v4.81H26l-1.41.22-1.26.19c-.14,0-.14,0-.18.15v0a10.33,10.33,0,0,1-.84,2,.1.1,0,0,0,0,.12L24,20.56c0,.05,0,.07,0,.11-1.09,1.1-2.18,2.19-3.26,3.29,0,0-.06,0-.09,0L18.3,22.31a.11.11,0,0,0-.16,0,11,11,0,0,1-2.07.86.11.11,0,0,0-.08.09c-.05.33-.11.66-.16,1-.1.59-.2,1.18-.29,1.77,0,.06,0,.07-.09.07H10.83c-.07,0-.09,0-.1-.08-.15-.91-.31-1.82-.46-2.72,0,0,0-.05,0-.06s-.2,0-.3-.09a10.59,10.59,0,0,1-1.87-.79.09.09,0,0,0-.11,0L5.62,24s-.08,0-.12,0L2.24,20.72s0,0,0-.1c.55-.78,1.1-1.56,1.66-2.33a.11.11,0,0,0,0-.12A9.87,9.87,0,0,1,3,16S3,16,3,16l-.72-.12-1.76-.3C.35,15.55.22,15.52.08,15.51Zm13,2.61a5,5,0,1,0-5-5A5,5,0,0,0,13.08,18.12Z',
+    transform: 'translate(-0.08 -0.04)'
+  },
+  {
+    name: 'serviceinstance',
+    path: 'M11.87,19.94v5.47c0,.61-.18.72-.69.42l-9.6-5.55a.62.62,0,0,1-.32-.64c0-3.64,0-7.29,0-10.94,0-.7.16-.79.79-.42,2.89,1.67,5.77,3.39,8.69,5a1.81,1.81,0,0,1,1.14,2C11.8,16.81,11.87,18.38,11.87,19.94Z\n' +
+    'M13,0a1,1,0,0,1,.53.2l9.4,5.45c.54.32.54.45,0,.78C19.78,8.2,16.7,10,13.63,11.74a1.12,1.12,0,0,1-1.24,0C9.28,9.92,6.15,8.12,3,6.31c-.55-.31-.55-.46,0-.78L12.45.19A.86.86,0,0,1,13,0Z\n' +
+    'M24.73,14.16c0,1.81,0,3.61,0,5.42a.8.8,0,0,1-.46.79l-9.36,5.41c-.64.38-.79.29-.79-.47,0-3.53,0-7.07,0-10.6a.92.92,0,0,1,.52-.94q4.63-2.65,9.26-5.35l.24-.14c.43-.2.58-.11.58.36Z',
+    transform: ''
+  }
+];
+
+export interface IXosServiceGraphIcons {
+  get(icon: string): IXosServiceGraphIcon;
+}
+
+export class XosServiceGraphIcons implements IXosServiceGraphIcons {
+  public get(icon: string): IXosServiceGraphIcon {
+    return _.find(icons, {name: icon});
+  }
+}
diff --git a/src/app/service-graph/services/d3-helpers/graph.helpers.ts b/src/app/service-graph/services/d3-helpers/graph.helpers.ts
deleted file mode 100644
index 15988cd..0000000
--- a/src/app/service-graph/services/d3-helpers/graph.helpers.ts
+++ /dev/null
@@ -1,43 +0,0 @@
-
-/*
- * Copyright 2017-present Open Networking Foundation
-
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
-
- * http://www.apache.org/licenses/LICENSE-2.0
-
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-
-import * as d3 from 'd3';
-
-export interface Id3BBox {
-  x: number;
-  y: number;
-  width: number;
-  height: number;
-}
-
-export interface IXosGraphHelpers {
-  parseElemClasses (classes: string): string;
-  getSiblingTextBBox(contex: any /* D3 this */): Id3BBox;
-}
-
-export class XosGraphHelpers implements IXosGraphHelpers {
-  public parseElemClasses (classes: string): string {
-    return classes ? classes.split(' ')
-      .map(c => `ext-${c}`)
-      .join(' ') : '';
-  }
-
-  public getSiblingTextBBox(contex: any): Id3BBox {
-    return d3.select(contex.parentNode).select('text').node().getBBox();
-  }
-}